## diffname port/chan.c 1990/0227
## diff -e /dev/null /n/bootesdump/1990/0227/sys/src/9/mips/chan.c
0a
#include "u.h"
#include "lib.h"
#include "mem.h"
#include "dat.h"
#include "fns.h"
#include "errno.h"
struct{
Lock;
Chan *free;
}chanalloc;
int
incref(Ref *r)
{
lock(r);
r->ref++;
unlock(r);
return r->ref;
}
int
decref(Ref *r)
{
lock(r);
r->ref--;
unlock(r);
return r->ref;
}
void
chaninit(void)
{
int i;
Chan *c;
chanalloc.free = ialloc(conf.nchan*sizeof(Chan), 0);
c = chanalloc.free;
for(i=0; i<conf.nchan-1; i++,c++){
c->fid = i;
c->next = c+1;
}
c->next = 0;
}
void
chandevreset(void)
{
int i;
for(i=0; i<strlen(devchar); i++)
(*devtab[i].reset)();
}
void
chandevinit(void)
{
int i;
for(i=0; i<strlen(devchar); i++)
(*devtab[i].init)();
}
Chan*
newchan(void)
{
Chan *c;
loop:
lock(&chanalloc);
if(c = chanalloc.free){ /* assign = */
chanalloc.free = c->next;
c->flag = 0;
c->ref = 1;
unlock(&chanalloc);
c->offset = 0;
c->mnt = 0;
c->stream = 0;
return c;
}
unlock(&chanalloc);
print("no chans\n");
if(u == 0)
panic("newchan");
u->p->state = Wakeme;
alarm(1000, wakeme, u->p);
sched();
goto loop;
}
void
close(Chan *c)
{
if(decref(c) == 0){
if(!waserror()){
(*devtab[c->type].close)(c);
poperror();
}
lock(&chanalloc);
c->next = chanalloc.free;
chanalloc.free = c;
unlock(&chanalloc);
}
}
int
eqchan(Chan *a, Chan *b, long qmask)
{
if((a->qid^b->qid) & qmask)
return 0;
if(a->type != b->type)
return 0;
if(a->dev != b->dev)
return 0;
return 1;
}
/*
* omnt is locked. return with nmnt locked.
*/
Mount*
mountsplit(Mount *omnt)
{
Mount *nmnt;
print("mount copy on write\n");
nmnt = newmount();
lock(nmnt);
nmnt->term = omnt->term;
nmnt->mountid = omnt->mountid;
nmnt->next = omnt->next;
if(nmnt->next)
incref(nmnt);
nmnt->c = omnt->c;
incref(nmnt->c);
omnt->ref--;
unlock(omnt);
return nmnt;
}
int
mount(Chan *new, Chan *old, int flag)
{
int i;
Mtab *mt, *mz;
Mount *mnt, *omnt, *nmnt, *pmnt;
Pgrp *pg;
int isnew;
if(CHDIR & (old->qid^new->qid))
error(0, Emount);
if((old->qid&CHDIR)==0 && (flag&MORDER)!=MREPL)
error(0, Emount);
mz = 0;
isnew = 0;
pg = u->p->pgrp;
lock(pg);
if(waserror()){
unlock(pg);
nexterror();
}
/*
* Is old already in mount table?
*/
mt = pg->mtab;
for(i=0; i<pg->nmtab; i++,mt++){
if(mt->c==0 && mz==0)
mz = mt;
else if(eqchan(mt->c, old, CHDIR|QPATH))
goto Found;
}
isnew = 1;
if(mz == 0){
if(i == conf.nmtab)
error(0, Enomount);
mz = &pg->mtab[i];
pg->nmtab++;
}
mz->mnt = 0;
mz->c = old;
mt = mz;
Found:
new->flag = CMOUNT;
if(flag & MCREATE)
new->flag |= CCREATE;
mnt = newmount();
mnt->c = new;
switch(flag & MORDER){
/*
* These two always go at head of list
*/
case MBEFORE:
if(mt->mnt == 0)
error(0, Enotunion);
/* fall through */
case MREPL:
omnt = mt->mnt;
if(omnt)
incref(omnt);
mnt->next = omnt;
mt->mnt = mnt;
mnt->term = 1;
if((flag&MORDER) == MBEFORE)
mnt->term = 0;
break;
/*
* This one never goes at head of list
*/
case MAFTER:
if(mt->mnt == 0)
error(0, Enotunion);
omnt = mt->mnt;
pmnt = 0;
while(!omnt->term){
lock(omnt);
if(omnt->ref > 1){
omnt = mountsplit(omnt);
if(pmnt)
pmnt->next = omnt;
else
mt->mnt = omnt;
}
unlock(omnt);
nmnt = omnt->next;
if(nmnt == 0)
panic("MAFTER term");
pmnt = omnt;
omnt = nmnt;
}
mnt->next = omnt->next;
omnt->next = mnt;
mnt->term = 1;
omnt->term = 0;
break;
}
incref(new);
if(isnew)
incref(old);
unlock(pg);
poperror();
return mnt->mountid;
}
Chan*
clone(Chan *c, Chan *nc)
{
return (*devtab[c->type].clone)(c, nc);
}
Chan*
domount(Chan *c)
{
int i;
ulong mntid;
Mtab *mt;
Mount *mnt;
Pgrp *pg;
Chan *nc, *mc;
pg = u->p->pgrp;
/*
* Is c in in mount table?
*/
mt = pg->mtab;
for(i=0; i<pg->nmtab; i++,mt++)
if(mt->c && eqchan(mt->c, c, CHDIR|QPATH))
goto Found;
/*
* No; c is unaffected
*/
return c;
/*
* Yes; move c through table
*/
Found:
lock(pg);
if(!eqchan(mt->c, c, CHDIR|QPATH)){ /* table changed underfoot */
print("domount: changed underfoot?\n");
unlock(pg);
return c;
}
mnt = mt->mnt;
mntid = mnt->mountid;
mc = mnt->c;
incref(mc);
unlock(pg);
if(waserror()){
close(mc);
nexterror();
}
nc = clone(mc, 0);
close(mc);
poperror();
close(c);
nc->mnt = mnt;
nc->mountid = mntid;
return nc;
}
Chan*
walk(Chan *ac, char *name, int domnt)
{
Mount *mnt;
int first = 1;
Chan *c = ac;
Chan *nc, *mc;
Pgrp *pg = u->p->pgrp;
/*
* name may be empty if the file name is "/", "#c" etc.
*/
Again:
if(name[0] && (*devtab[c->type].walk)(c, name)==0){
if(!(c->flag&CMOUNT))
goto Notfound;
mnt = c->mnt;
if(mnt == 0)
panic("walk");
lock(pg);
if(mnt->term){
unlock(pg);
goto Notfound;
}
if(c->mountid != mnt->mountid){
print("walk: changed underfoot?\n");
unlock(pg);
goto Notfound;
}
mnt = mnt->next;
mc = mnt->c;
incref(mc);
unlock(pg);
if(waserror()){
close(mc);
nexterror();
}
if(mnt == 0)
panic("walk 1");
nc = clone(mc, 0);
close(mc);
poperror();
if(!first)
close(c);
nc->mnt = mnt;
c = nc;
first = 0;
goto Again;
}
if(name[0]) /* walk succeeded */
c->flag &= ~CMOUNT;
if(!first)
close(ac);
if(domnt)
return domount(c);
return c;
Notfound:
if(!first)
close(c);
return 0;
}
/*
* c is a mounted non-creatable directory. find a creatable one.
*/
Chan*
createdir(Chan *c)
{
Mount *mnt;
Pgrp *pg = u->p->pgrp;
Chan *mc, *nc;
lock(pg);
if(waserror()){
unlock(pg);
nexterror();
}
mnt = c->mnt;
if(c->mountid != mnt->mountid){
print("createdir: changed underfoot?\n");
error(0, Enocreate);
}
do{
if(mnt->term)
error(0, Enocreate);
mnt = mnt->next;
}while(!(mnt->c->flag&CCREATE));
mc = mnt->c;
incref(mc);
unlock(pg);
if(waserror()){
close(mc);
nexterror();
}
nc = clone(mc, 0);
poperror();
close(c);
close(mc);
nc->mnt = mnt;
return nc;
}
/*
* Turn a name into a channel.
* &name[0] is known to be a valid address. It may be a kernel address.
*/
Chan*
namec(char *name, int amode, int omode, ulong perm)
{
Chan *c, *nc;
int t;
int mntok;
char *elem = u->elem;
if(name[0] == 0)
error(0, Enonexist);
mntok = 1;
if(name[0] == '/'){
c = clone(u->slash, 0);
/*
* Skip leading slashes.
*/
name = skipslash(name);
}else if(name[0] == '#'){
mntok = 0;
if(!((ulong)name & KZERO))
validaddr((ulong)(name+1), 2, 0);
if(name[1]=='|' || ('A'<=name[1] && name[1]<='Z'))
error(0, Enonexist);
t = devno(name[1], 1);
if(t == -1)
error(0, Ebadsharp);
name += 2;
if(*name == '/'){
name = skipslash(name);
elem[0]=0;
}else
name = nextelem(name, elem);
c = (*devtab[t].attach)(elem);
}else
c = clone(u->dot, 0);
if(waserror()){
close(c);
nexterror();
}
name = nextelem(name, elem);
if(mntok)
if(!(amode==Amount && elem[0]==0)) /* don't domount on dot or slash */
c = domount(c); /* see case Atodir below */
/*
* How to treat the last element of the name depends on the operation.
* Therefore do all but the last element by the easy algorithm.
*/
while(*name){
if((nc=walk(c, elem, mntok)) == 0)
error(0, Enonexist);
c = nc;
name = nextelem(name, elem);
}
/*
* Last element; act according to type of access.
*/
switch(amode){
case Aaccess:
if((nc=walk(c, elem, mntok)) == 0)
error(0, Enonexist);
c = nc;
break;
case Atodir:
/*
* Directories (e.g. for cd) are left before the mount point,
* so one may mount on / or . and see the effect.
*/
if((nc=walk(c, elem, 0)) == 0)
error(0, Enonexist);
c = nc;
if(!(c->qid & CHDIR))
error(0, Enotdir);
break;
case Aopen:
if((nc=walk(c, elem, mntok)) == 0)
error(0, Enonexist);
c = nc;
Open:
c = (*devtab[c->type].open)(c, omode);
break;
case Amount:
/*
* When mounting on an already mounted upon directory, one wants
* the second mount to be attached to the original directory, not
* the replacement.
*/
if((nc=walk(c, elem, 0)) == 0)
error(0, Enonexist);
c = nc;
break;
case Acreate:
if((nc=walk(c, elem, 1)) != 0){
c = nc;
omode |= OTRUNC;
goto Open;
}
if((c->flag&(CMOUNT|CCREATE)) == CMOUNT)
c = createdir(c);
(*devtab[c->type].create)(c, elem, omode, perm);
break;
default:
panic("unknown namec access %d\n", amode);
}
poperror();
return c;
}
/*
* name[0] is addressable.
*/
char*
skipslash(char *name)
{
while(*name == '/'){
if(((ulong)name&KZERO)==0 && (((ulong)name+1)&(BY2PG-1))==0)
validaddr((ulong)name+1, 1, 0);
name++;
}
return name;
}
char isfrog[]={
/*NUL*/ 1, 1, 1, 1, 1, 1, 1, 1,
/*BKS*/ 1, 1, 1, 1, 1, 1, 1, 1,
/*DLE*/ 1, 1, 1, 1, 1, 1, 1, 1,
/*CAN*/ 1, 1, 1, 1, 1, 1, 1, 1,
[' '] 1,
['/'] 1,
[0x7f] 1,
};
/*
* name[0] should not be a slash.
* Advance name to next element in path, copying current element into elem.
* Return pointer to next element, skipping slashes.
* &name[0] is known to be a valid address.
*/
char*
nextelem(char *name, char *elem)
{
int i, user, c;
char *end, *e;
if(*name == '/')
error(0, Efilename);
end = vmemchr(name, 0, NAMELEN);
if(end == 0){
end = vmemchr(name, '/', NAMELEN);
if(end == 0)
error(0, Efilename);
}else{
e = memchr(name, '/', end-name);
if(e)
end = e;
}
while(name < end){
c = *name++;
if((c&0x80) || isfrog[c])
error(0, Ebadchar);
*elem++ = c;
}
*elem = 0;
return skipslash(name);
}
void
isdir(Chan *c)
{
if(c->qid & CHDIR)
return;
error(0, Enotdir);
}
.
## diffname port/chan.c 1990/0303
## diff -e /n/bootesdump/1990/0227/sys/src/9/mips/chan.c /n/bootesdump/1990/0303/sys/src/9/mips/chan.c
80a
c->mchan = 0;
c->mqid = 0;
.
## diffname port/chan.c 1990/0321
## diff -e /n/bootesdump/1990/0303/sys/src/9/mips/chan.c /n/bootesdump/1990/0321/sys/src/9/mips/chan.c
394c
pprint("createdir: changed underfoot?\n");
.
355a
nc->mountid = mnt->mountid;
.
336c
pprint("walk: changed underfoot?\n");
.
289c
pprint("domount: changed underfoot?\n");
.
248a
}
if(islast)
pg->nmtab++;
.
247c
if(mz){
mz->c = old;
.
185d
182c
islast++;
.
177d
175a
}
.
174c
else if(eqchan(mt->c, old, CHDIR|QPATH)){
mz = 0;
.
163a
if(mnt){
mnt->c = 0; /* caller will close new */
closemount(mnt);
}
.
160c
islast = 0;
mnt = 0;
.
152c
int islast;
.
## diffname port/chan.c 1990/0513
## diff -e /n/bootesdump/1990/0321/sys/src/9/mips/chan.c /n/bootesdump/1990/0513/sys/src/9/mips/chan.c
494a
}
.
493c
if((nc=walk(c, elem, mntok)) == 0){
print("%d pc %lux\n", u->nerrlab, u->errlab[u->nerrlab-1].pc);
.
## diffname port/chan.c 1990/0515
## diff -e /n/bootesdump/1990/0513/sys/src/9/mips/chan.c /n/bootesdump/1990/0515/sys/src/9/mips/chan.c
496d
493,494c
if((nc=walk(c, elem, mntok)) == 0)
.
## diffname port/chan.c 1990/0603
## diff -e /n/bootesdump/1990/0515/sys/src/9/mips/chan.c /n/bootesdump/1990/0603/sys/src/9/mips/chan.c
217a
else
mnt->term = 1;
.
215d
210,213c
mnt->next = mt->mnt;
.
137c
incref(nmnt->next);
.
## diffname port/chan.c 1990/0617
## diff -e /n/bootesdump/1990/0603/sys/src/9/mips/chan.c /n/bootesdump/1990/0617/sys/src/9/mips/chan.c
130d
## diffname port/chan.c 1990/0707
## diff -e /n/bootesdump/1990/0617/sys/src/9/mips/chan.c /n/bootesdump/1990/0707/sys/src/9/mips/chan.c
74a
c->type = 0; /* if closed before changed, this calls rooterror, a nop */
.
## diffname port/chan.c 1990/08141
## diff -e /n/bootesdump/1990/0707/sys/src/9/mips/chan.c /n/bootesdump/1990/08141/sys/src/9/mips/chan.c
535a
if(omode & OCEXEC)
c->flag |= CCEXEC;
.
513a
if(omode & OCEXEC)
c->flag |= CCEXEC;
.
450c
if(name[1]=='|' || name[1]=='M')
.
## diffname port/chan.c 1990/0820
## diff -e /n/bootesdump/1990/08141/sys/src/9/mips/chan.c /n/bootesdump/1990/0820/sys/src/9/mips/chan.c
558a
}
if(*name == '.'){
if(((ulong)name&KZERO)==0 && (((ulong)name+1)&(BY2PG-1))==0)
validaddr((ulong)name+1, 1, 0);
if(name[1]==0 || name[1]=='/'){
name++;
goto Again;
}
.
554a
Again:
.
529a
if(isdot)
error(0, Eisdir);
.
509,511c
if(isdot)
c = domount(c);
else{
if((nc=walk(c, elem, mntok)) == 0)
error(0, Enonexist);
c = nc;
}
.
491,493c
if(isdot)
c = domount(c);
else{
if((nc=walk(c, elem, mntok)) == 0)
error(0, Enonexist);
c = nc;
}
.
484a
.
471,472c
if(mntok && !isdot)
if(!(amode==Amount && elem[0]==0)) /* don't domount on slash */
.
463a
name = skipslash(name); /* eat leading ./ */
if(*name == 0)
isdot = 1;
}
.
462c
}else{
.
439a
isdot = 0;
.
434c
int mntok, isdot;
.
343c
pprint("walk: changed underfoot? '%s'\n", name);
.
## diffname port/chan.c 1990/0821
## diff -e /n/bootesdump/1990/0820/sys/src/9/mips/chan.c /n/bootesdump/1990/0821/sys/src/9/mips/chan.c
615c
end = memchr(name, '/', NAMELEN);
.
613c
end = memchr(name, 0, NAMELEN);
.
603d
578,585d
576a
if(*name=='.' && (name[1]==0 || name[1]=='/')){
name++;
goto Again;
.
573,575c
while(*name == '/')
.
449,450d
438a
/*
* Make sure all of name is o.k. first byte is validated
* externally so if it's a kernel address we know it's o.k.
*/
if(!((ulong)name & KZERO)){
p = name;
t = BY2PG-((ulong)p&(BY2PG-1));
while(vmemchr(p, 0, t) == 0){
p += t;
t = BY2PG;
}
}
elem = u->elem;
.
435c
char *p;
char *elem;
.
## diffname port/chan.c 1990/0907
## diff -e /n/bootesdump/1990/0821/sys/src/9/mips/chan.c /n/bootesdump/1990/0907/sys/src/9/mips/chan.c
103a
c->flag = CFREE;
.
98a
if(c->flag & CFREE)
panic("close");
.
## diffname port/chan.c 1990/0914
## diff -e /n/bootesdump/1990/0907/sys/src/9/mips/chan.c /n/bootesdump/1990/0914/sys/src/9/mips/chan.c
544a
saveregisters(); /* else error() in open has wrong value of c saved */
.
427a
void
saveregisters(void)
{
}
.
378,379c
.
374a
if(domnt){
if(waserror()){
print("domount error\n");
if(!first)
close(c);
return 0;
}
c = domount(c);
poperror();
}
.
## diffname port/chan.c 1990/09141
## diff -e /n/bootesdump/1990/0914/sys/src/9/mips/chan.c /n/bootesdump/1990/09141/sys/src/9/mips/chan.c
377d
## diffname port/chan.c 1990/1009
## diff -e /n/bootesdump/1990/09141/sys/src/9/mips/chan.c /n/bootesdump/1990/1009/sys/src/9/mips/chan.c
482c
if(name[1]=='M')
.
## diffname port/chan.c 1990/1104
## diff -e /n/bootesdump/1990/1009/sys/src/9/mips/chan.c /n/bootesdump/1990/1104/sys/src/9/mips/chan.c
29c
return x;
.
27c
x = --r->ref;
.
25a
int x;
.
20c
return x;
.
18c
x = ++r->ref;
.
16a
int x;
.
## diffname port/chan.c 1990/11211
## diff -e /n/bootesdump/1990/1104/sys/src/9/mips/chan.c /n/bootesdump/1990/11211/sys/src/9/mips/chan.c
666c
error(Enotdir);
.
664c
if(c->qid.path & CHDIR)
.
654c
error(Ebadchar);
.
645c
error(Efilename);
.
640c
error(Efilename);
.
582c
error(Eisdir);
.
576c
error(Enonexist);
.
559c
error(Enonexist);
.
550,551c
if(!(c->qid.path & CHDIR))
error(Enotdir);
.
548c
error(Enonexist);
.
537c
error(Enonexist);
.
522c
error(Enonexist);
.
490c
error(Ebadsharp);
.
487c
error(Enonexist);
.
460c
error(Enonexist);
.
423c
error(Enocreate);
.
419c
error(Enocreate);
.
230c
error(Enotunion);
.
213c
error(Enotunion);
.
193c
error(Enomount);
.
161,164c
if(CHDIR & (old->qid.path^new->qid.path))
error(Emount);
if((old->qid.path&CHDIR)==0 && (flag&MORDER)!=MREPL)
error(Emount);
.
122a
if(!pathonly && a->qid.vers!=b->qid.vers)
return 0;
.
121c
return a.path==b.path && a.vers==b.vers;
}
int
eqchan(Chan *a, Chan *b, int pathonly)
{
if(a->qid.path != b->qid.path)
.
119c
eqqid(Qid a, Qid b)
.
87c
c->mqid = (Qid){0, 0};
.
82a
c->dev = 0;
.
## diffname port/chan.c 1990/1122
## diff -e /n/bootesdump/1990/11211/sys/src/9/mips/chan.c /n/bootesdump/1990/1122/sys/src/9/mips/chan.c
311c
if(!eqchan(mt->c, c, 1)){ /* table changed underfoot */
.
299c
if(mt->c && eqchan(mt->c, c, 1))
.
195c
else if(eqchan(mt->c, old, 1)){
.
## diffname port/chan.c 1991/0413
## diff -e /n/bootesdump/1990/1210/sys/src/9/mips/chan.c /n/bootesdump/1991/0413/sys/src/9/port/chan.c
111,115c
(*devtab[c->type].close)(c);
freechan(c);
poperror();
.
107,109c
if(waserror()) {
freechan(c);
nexterror();
.
101a
freechan(Chan *c)
{
c->flag = CFREE;
lock(&chanalloc);
c->next = chanalloc.free;
chanalloc.free = c;
unlock(&chanalloc);
}
void
.
## diffname port/chan.c 1991/0414
## diff -e /n/bootesdump/1991/0413/sys/src/9/port/chan.c /n/bootesdump/1991/0414/sys/src/9/port/chan.c
121,123c
c->flag = CFREE;
lock(&chanalloc);
c->next = chanalloc.free;
chanalloc.free = c;
unlock(&chanalloc);
.
117,119c
if(!waserror()) {
(*devtab[c->type].close)(c);
poperror();
.
104,108c
if(decref(c) == 0){
c->flag = CFREE;
lock(&chanalloc);
c->next = chanalloc.free;
chanalloc.free = c;
unlock(&chanalloc);
}
.
## diffname port/chan.c 1991/0416
## diff -e /n/bootesdump/1991/0414/sys/src/9/port/chan.c /n/bootesdump/1991/0416/sys/src/9/port/chan.c
551d
533,534c
/*
* If mounting, don't follow the mount entry for root or the
* current directory.
*/
if(mntok && !isdot && !(amode==Amount && elem[0]==0))
.
## diffname port/chan.c 1991/0421
## diff -e /n/bootesdump/1991/0416/sys/src/9/port/chan.c /n/bootesdump/1991/0421/sys/src/9/port/chan.c
86a
c->aux = 0;
c->mntindex = 0;
.
## diffname port/chan.c 1991/0423
## diff -e /n/bootesdump/1991/0421/sys/src/9/port/chan.c /n/bootesdump/1991/0423/sys/src/9/port/chan.c
624c
if(f.c->flag & CMOUNT){
f.c->mnt = f.mnt;
f.c->mountid = f.mountid;
}
return f.c;
.
622a
if(f.needcl)
doclone(&f);
.
617c
f.c->flag |= CCEXEC;
.
613,615c
if((f.c->flag&(CMOUNT|CCREATE)) == CMOUNT)
createdir(&f);
if(f.needcl)
doclone(&f);
(*devtab[f.c->type].create)(f.c, elem, omode, perm);
.
608,609c
if(walk(&f, elem, 1) != 0){
.
602d
600c
if(walk(&f, elem, 0) == 0)
.
591c
f.c->flag |= CCEXEC;
.
588,589c
saveregisters(); /* else error() in open has wrong value of c saved */
if(f.needcl)
doclone(&f);
f.c = (*devtab[f.c->type].open)(f.c, omode);
.
585d
583c
if(walk(&f, elem, mntok) == 0)
.
581c
domount(&f);
.
574,575c
if(!(f.c->qid.path & CHDIR))
.
572c
if(walk(&f, elem, 0) == 0)
.
563d
561c
if(walk(&f, elem, mntok) == 0)
.
559c
domount(&f);
.
549d
547c
if(walk(&f, elem, mntok) == 0)
.
540c
domount(&f); /* see case Atodir below */
.
529c
close(f.c);
.
522c
f.c = u->dot;
incref(f.c);
f.needcl = 1;
.
520c
f.c = (*devtab[t].attach)(elem);
f.needcl = 0;
.
502c
f.c = u->slash;
incref(f.c);
f.needcl = 1;
.
500a
f.mnt = 0;
.
480a
Finger f;
.
476d
468a
void
doclone(Finger *f)
{
Chan *nc;
if(f->needcl == 0)
return;
nc = clone(f->c, 0);
close(f->c);
f->c = nc;
f->needcl = 0;
}
.
458,461c
close(f->c);
f->needcl = 1;
f->c = mc;
.
452,456d
439,440c
mnt = f->mnt;
if(f->mountid != mnt->mountid){
.
432c
Chan *mc;
.
427,428c
void
createdir(Finger *f)
.
425c
* f->c is a mounted non-creatable directory. find a creatable one.
.
416,417d
414a
return 1;
.
412,413c
if(domnt)
domount(f);
.
408,409c
/*
* we get here only if we have a cloned and walked
* channel
*/
if(!first)
close(f->c);
f->c = c;
f->needcl = 0;
f->mnt = 0;
c->flag &= ~CMOUNT;
.
406c
c = mc;
first = 0;
.
370,403d
360,368c
if(name[0]){
for(;;){
if(!first || f->needcl){
mc = (*devtab[c->type].clwalk)(c, name);
if(mc){
close(c);
c = mc;
break;
}
} else {
if((*devtab[c->type].walk)(c, name) != 0){
break;
}
}
if(!(c->flag&CMOUNT))
goto Notfound;
if(mnt == 0)
panic("walk"); /* ??? is this safe ??? */
lock(pg);
if(mnt->term){
unlock(pg);
goto Notfound;
}
if(mountid != mnt->mountid){
pprint("walk: changed underfoot? '%s'\n", name);
unlock(pg);
goto Notfound;
}
mnt = mnt->next;
mountid = mnt->mountid;
mc = mnt->c;
incref(mc);
.
353,354c
Mount *mnt = f->mnt;
ulong mountid = f->mountid;
Chan *c = f->c;
Chan *mc;
.
351d
348,349c
int
walk(Finger *f, char *name, int domnt)
.
335,345c
close(f->c);
f->c = mc;
f->needcl = 1;
.
330,332c
f->mnt = mt->mnt;
f->mountid = f->mnt->mountid;
mc = mt->mnt->c;
.
328c
return;
.
325c
if(!eqchan(mt->c, f->c, 1)){ /* table changed underfoot */
.
318c
return;
.
313c
if(mt->c && eqchan(mt->c, f->c, 1))
.
305c
Chan *mc;
.
303d
301d
297,298c
void
domount(Finger *f)
.
88d
86d
13a
/*
* used by namec, domount, and walk to point
* to the current mount entry during name resolution
*/
typedef struct Finger Finger;
struct Finger {
Chan *c; /* channel we're walking */
int needcl; /* true if we need to clone c before using it */
Mount *mnt; /* last mount point we ran traversed */
ulong mountid; /* id of that mount point */
};
.
## diffname port/chan.c 1991/0426
## diff -e /n/bootesdump/1991/0423/sys/src/9/port/chan.c /n/bootesdump/1991/0426/sys/src/9/port/chan.c
114,125d
## diffname port/chan.c 1991/0427
## diff -e /n/bootesdump/1991/0426/sys/src/9/port/chan.c /n/bootesdump/1991/0427/sys/src/9/port/chan.c
624,628c
return c;
.
621,622d
615c
c->flag |= CCEXEC;
.
609,613c
close(cc);
poperror();
/*
* the file didn't exist, try the create
*/
if((c->flag&(CMOUNT|CCREATE)) == CMOUNT)
c = createdir(c);
(*devtab[c->type].create)(c, elem, omode, perm);
.
605c
/*
* Walk the element before trying to create it
* to see if it exists. We clone the channel
* first, just in case someone is trying to
* use clwalk outside the kernel.
*/
cc = clone(c, 0);
if(waserror()){
close(cc);
nexterror();
}
if((nc=walk(cc, elem, 1)) != 0){
poperror();
close(c);
c = nc;
.
599a
c = nc;
.
598c
if((nc=walk(c, elem, 0)) == 0)
.
589c
c->flag |= CCEXEC;
.
584,587c
saveregisters(); /* else error() in open has wrong value of c saved */
c = (*devtab[c->type].open)(c, omode);
.
581a
c = nc;
.
580c
if((nc=walk(c, elem, mntok)) == 0)
.
578c
c = domount(c);
.
572c
c = nc;
if(!(c->qid.path & CHDIR))
.
570c
if((nc=walk(c, elem, 0)) == 0)
.
561a
c = nc;
.
560c
if((nc=walk(c, elem, mntok)) == 0)
.
558c
c = domount(c);
.
548a
c = nc;
.
547c
if((nc=walk(c, elem, mntok)) == 0)
.
540c
c = domount(c); /* see case Atodir below */
.
529c
close(c);
.
520,522c
c = clone(u->dot, 0);
.
517,518c
c = (*devtab[t].attach)(elem);
.
497,499c
c = clone(u->slash, 0);
.
495d
474d
469a
Chan *c, *nc, *cc;
.
450,462d
440,442c
close(c);
close(mc);
nc->mnt = mnt;
return nc;
.
438a
if(waserror()){
close(mc);
nexterror();
}
nc = clone(mc, 0);
.
426,427c
mnt = c->mnt;
if(c->mountid != mnt->mountid){
.
419c
Chan *mc, *nc;
.
414,415c
Chan*
createdir(Chan *c)
.
412c
* c is a mounted non-creatable directory. find a creatable one.
.
404a
return c;
.
403d
400,401c
if(!first)
close(ac);
.
397a
if(domnt){
if(waserror()){
if(!first)
close(c);
return 0;
}
c = domount(c);
poperror();
.
393,396c
close(c);
nc->mnt = mnt;
nc->mountid = mnt->mountid;
c = nc;
first = 0;
goto Again;
}
if(name[0]) /* walk succeeded */
.
387,391c
if(c->mountid != mnt->mountid){
pprint("walk: changed underfoot? '%s'\n", name);
unlock(pg);
goto Notfound;
}
mnt = mnt->next;
mc = mnt->c;
incref(mc);
unlock(pg);
if(waserror()){
close(mc);
nexterror();
}
if(mnt == 0)
panic("walk 1");
nc = clone(mc, 0);
close(mc);
poperror();
.
382,385c
goto Notfound;
.
349,380c
Again:
if(name[0] && (*devtab[c->type].walk)(c, name)==0){
if(!(c->flag&CMOUNT))
goto Notfound;
mnt = c->mnt;
if(mnt == 0)
panic("walk");
lock(pg);
if(mnt->term){
.
340,343c
Chan *c = ac;
Chan *nc, *mc;
.
338a
Mount *mnt;
.
336,337c
Chan*
walk(Chan *ac, char *name, int domnt)
.
331,333c
if(waserror()){
close(mc);
nexterror();
}
nc = clone(mc, 0);
close(mc);
poperror();
close(c);
nc->mnt = mnt;
nc->mountid = mntid;
return nc;
.
326,328c
mnt = mt->mnt;
mntid = mnt->mountid;
mc = mnt->c;
.
324c
return c;
.
321c
if(!eqchan(mt->c, c, 1)){ /* table changed underfoot */
.
314c
return c;
.
309c
if(mt->c && eqchan(mt->c, c, 1))
.
301c
Chan *nc, *mc;
.
299a
Mount *mnt;
.
298a
ulong mntid;
.
295,296c
Chan*
domount(Chan *c)
.
98a
c->mntindex = 0;
.
97a
c->stream = 0;
.
14,25d
## diffname port/chan.c 1991/0705
## diff -e /n/bootesdump/1991/0427/sys/src/9/port/chan.c /n/bootesdump/1991/0705/sys/src/9/port/chan.c
32a
if(x < 0)
panic("decref");
.
## diffname port/chan.c 1991/0722
## diff -e /n/bootesdump/1991/0705/sys/src/9/port/chan.c /n/bootesdump/1991/0722/sys/src/9/port/chan.c
34a
}
.
33c
if(x < 0) {
if(u) {
print("%d: %s %lux %lux\n", u->p->pid, u->p->text, *(ulong*)((Ureg*)UREGADDR)->pc, r);
for(i = 0; i < NSEG; i++) {
s = u->p->seg[i];
if(s)
print("%d: %lux %lux %lux", i, s, s->base, s->top);
}
}
.
28a
int i;
Segment *s;
.
24a
#include "ureg.h"
.
## diffname port/chan.c 1991/0723
## diff -e /n/bootesdump/1991/0722/sys/src/9/port/chan.c /n/bootesdump/1991/0723/sys/src/9/port/chan.c
47c
.
37,45c
if(x < 0)
.
## diffname port/chan.c 1991/0727
## diff -e /n/bootesdump/1991/0723/sys/src/9/port/chan.c /n/bootesdump/1991/0727/sys/src/9/port/chan.c
666a
void
nameok(char *elem)
{
while(*elem) {
if((*elem&0x80) || isfrog[*elem])
error(Ebadchar);
elem++;
}
}
.
614a
nameok(elem);
.
8d
## diffname port/chan.c 1991/0912
## diff -e /n/bootesdump/1991/0727/sys/src/9/port/chan.c /n/bootesdump/1991/0912/sys/src/9/port/chan.c
445a
poperror();
.
## diffname port/chan.c 1991/1011
## diff -e /n/bootesdump/1991/0912/sys/src/9/port/chan.c /n/bootesdump/1991/1011/sys/src/9/port/chan.c
629c
if(c->mnt && !(c->flag&CCREATE))
.
583c
/* else error() in open has wrong value of c saved */
saveregisters();
.
475c
char *elem, *nn;
.
438,456c
error(Enocreate);
.
433,436c
for(f = c->mnt; f; f = f->next) {
if(f->to->flag&CCREATE) {
nc = clone(f->to, 0);
nc->mnt = f;
runlock(&pg->ns);
close(c);
return nc;
}
.
428,430c
pg = u->p->pgrp;
rlock(&pg->ns);
if(waserror()) {
runlock(&pg->ns);
.
424,426c
Pgrp *pg;
Chan *nc;
Mount *f;
.
415c
c = 0;
}
poperror();
runlock(&pg->ns);
if(c) {
if(dotdot)
c = undomount(c);
c->mnt = 0;
if(domnt) {
if(waserror()) {
close(c);
nexterror();
}
c = domount(c);
poperror();
}
close(ac);
}
return c;
.
412,413c
if((*devtab[ac->type].walk)(ac, name) != 0) {
if(dotdot)
ac = undomount(ac);
if(domnt)
ac = domount(ac);
return ac;
}
if(ac->mnt == 0)
return 0;
pg = u->p->pgrp;
rlock(&pg->ns);
if(waserror()) {
runlock(&pg->ns);
if(c)
close(c);
nexterror();
}
for(f = ac->mnt; f; f = f->next) {
c = clone(f->to, 0);
if((*devtab[c->type].walk)(c, name) != 0)
break;
.
410c
dotdot = 0;
if(name[0] == '.')
if(name[1] == '.')
if(name[2] == '\0') {
ac = undomount(ac);
dotdot = 1;
}
.
408a
if(*name == '\0')
return ac;
.
406,407c
Chan*
walk(Chan *ac, char *name, int domnt)
{
Pgrp *pg;
Chan *c = 0;
Mount *f;
int dotdot;
.
404a
poperror();
runlock(&pg->ns);
return c;
}
.
402,403d
393,400c
he = &pg->mnthash[MNTHASH];
for(h = pg->mnthash; h < he; h++) {
for(f = *h; f; f = f->hash) {
for(t = f->mount; t; t = t->next)
if(eqchan(c, t->to, 1)) {
close(c);
c = clone(t->head->from, 0);
break;
}
.
351,390c
pg = u->p->pgrp;
rlock(&pg->ns);
if(waserror()) {
runlock(&pg->ns);
nexterror();
.
345,349c
Pgrp *pg;
Mhead **h, **he, *f;
Mount *t;
.
343c
undomount(Chan *c)
.
336,339c
runlock(&pg->ns);
return c;
.
333,334c
c->mnt = 0;
for(m = MOUNTH(pg, c); m; m = m->hash)
if(eqchan(m->from, c, 1)) {
nc = clone(m->mount->to, 0);
nc->mnt = m->mount;
nc->mountid = m->mount->mountid;
close(c);
c = nc;
break;
}
.
302,330c
rlock(&pg->ns);
if(waserror()) {
runlock(&pg->ns);
.
299c
Chan *nc;
Mhead *m;
.
294,297d
278,282c
if(mounted == 0) {
*l = m->hash;
wunlock(&pg->ns);
mountfree(m->mount);
close(m->from);
mntheadfree(m);
return;
}
p = &m->mount;
for(f = *p; f; f = f->next) {
if(eqchan(f->to, mounted, 1)) {
*p = f->next;
f->next = 0;
mountfree(f);
if(m->mount == 0) {
*l = m->hash;
wunlock(&pg->ns);
close(m->from);
mntheadfree(m);
return;
}
wunlock(&pg->ns);
return;
}
p = &f->next;
}
wunlock(&pg->ns);
errors("not in union");
.
273,276c
if(m == 0) {
wunlock(&pg->ns);
errors("not mounted");
.
242,270c
void
unmount(Chan *mnt, Chan *mounted)
{
Pgrp *pg;
Mhead *m, **l;
Mount *f, **p;
pg = u->p->pgrp;
wlock(&pg->ns);
l = &MOUNTH(pg, mnt);
for(m = *l; m; m = m->hash) {
if(eqchan(m->from, mnt, 1))
break;
l = &m->hash;
.
233,240c
wunlock(&pg->ns);
poperror();
return nm->mountid;
}
.
224,231c
if(m->mount && order == MAFTER) {
for(f = m->mount; f->next; f = f->next)
;
f->next = nm;
}
else {
nm->next = m->mount;
m->mount = nm;
}
.
221,222d
217,218c
if(m->mount && order == MREPL) {
mountfree(m->mount);
m->mount = 0;
}
nm = newmount(m, new);
.
214,215d
208,212c
if(m == 0) {
m = newmnthead();
m->from = old;
incref(old);
m->hash = *l;
*l = m;
if(order != MREPL)
m->mount = newmount(m, old);
.
196,206c
l = &MOUNTH(pg, old);
for(m = *l; m; m = m->hash) {
if(eqchan(m->from, old, 1))
break;
l = &m->hash;
.
187,193c
wlock(&pg->ns);
if(waserror()) {
wunlock(&pg->ns);
.
183,185d
180c
order = flag&MORDER;
if((old->qid.path&CHDIR)==0 && order != MREPL)
.
176c
Mount *nm, *f;
Mhead *m, **l;
int order;
.
172,174d
147,168d
113a
.
99,106d
89,97c
resrcwait("no chans\n");
.
81,87c
for(;;) {
lock(&chanalloc);
if(c = chanalloc.free) {
chanalloc.free = c->next;
/* if closed before changed, this calls rooterror, a nop */
c->type = 0;
c->flag = 0;
c->ref = 1;
unlock(&chanalloc);
c->dev = 0;
c->offset = 0;
c->mnt = 0;
c->stream = 0;
c->aux = 0;
c->mntindex = 0;
c->mchan = 0;
c->mqid = (Qid){0, 0};
return c;
}
.
## diffname port/chan.c 1991/1105
## diff -e /n/bootesdump/1991/1011/sys/src/9/port/chan.c /n/bootesdump/1991/1105/sys/src/9/port/chan.c
595a
poperror();
.
592a
/*
* protect against the open/create race. This is not a complete
* fix. It just reduces the window.
*/
if(waserror()) {
strcpy(createerr, u->error);
nc = walk(c, elem, 1);
if(nc == 0)
errors(createerr);
c = nc;
omode |= OTRUNC;
goto Open;
}
.
436a
char createerr[ERRLEN];
.
## diffname port/chan.c 1991/1107
## diff -e /n/bootesdump/1991/1105/sys/src/9/port/chan.c /n/bootesdump/1991/1107/sys/src/9/port/chan.c
653a
if(elem >= eelem)
error(Efilename);
.
649a
char *eelem;
eelem = elem+NAMELEN;
.
## diffname port/chan.c 1991/1126
## diff -e /n/bootesdump/1991/1107/sys/src/9/port/chan.c /n/bootesdump/1991/1126/sys/src/9/port/chan.c
412a
poperror();
.
## diffname port/chan.c 1991/1206
## diff -e /n/bootesdump/1991/1126/sys/src/9/port/chan.c /n/bootesdump/1991/1206/sys/src/9/port/chan.c
665,666d
556c
* subsequent mounts to be attached to the original directory, not
.
85c
/* if you get an error before associating with a dev,
close calls rootclose, a nop */
.
24,25d
## diffname port/chan.c 1992/0101
## diff -e /n/bootesdump/1991/1206/sys/src/9/port/chan.c /n/bootesdump/1992/0101/sys/src/9/port/chan.c
684,685c
c = *(uchar*)name++;
if(isfrog[c])
.
654c
if(isfrog[*(uchar*)elem])
.
644a
/*0x80+ NUL*/ 1, 1, 1, 1, 1, 1, 1, 1,
/*BKS*/ 1, 1, 1, 1, 1, 1, 1, 1,
/*DLE*/ 1, 1, 1, 1, 1, 1, 1, 1,
/*CAN*/ 1, 1, 1, 1, 1, 1, 1, 1,
.
637c
char isfrog[256]={
.
## diffname port/chan.c 1992/0111
## diff -e /n/bootesdump/1992/0101/sys/src/9/port/chan.c /n/bootesdump/1992/0111/sys/src/9/port/chan.c
603c
error(createerr);
.
257c
error(Eunion);
.
226c
error(Eunmount);
.
6c
#include "../port/error.h"
.
## diffname port/chan.c 1992/0213
## diff -e /n/bootesdump/1992/0111/sys/src/9/port/chan.c /n/bootesdump/1992/0213/sys/src/9/port/chan.c
693d
691d
688,689c
name += chartorune(&r, name);
if(r<sizeof(isfrog) && isfrog[r])
.
677,686c
end = utfrune(name, '/');
if(end == 0)
end = strchr(name, 0);
w = end-name;
if(w >= NAMELEN)
error(Efilename);
memmove(elem, name, w);
elem[w] = 0;
.
673a
Rune r;
.
672c
int i, user, w;
.
## diffname port/chan.c 1992/0320
## diff -e /n/bootesdump/1992/0213/sys/src/9/port/chan.c /n/bootesdump/1992/0320/sys/src/9/port/chan.c
115,119c
chanfree(c);
.
104a
chanfree(Chan *c)
{
c->flag = CFREE;
lock(&chanalloc);
c->next = chanalloc.free;
chanalloc.free = c;
unlock(&chanalloc);
}
void
.
## diffname port/chan.c 1992/0321
## diff -e /n/bootesdump/1992/0320/sys/src/9/port/chan.c /n/bootesdump/1992/0321/sys/src/9/port/chan.c
2c
#include "../port/lib.h"
.
## diffname port/chan.c 1992/0520
## diff -e /n/bootesdump/1992/0321/sys/src/9/port/chan.c /n/bootesdump/1992/0520/sys/src/9/port/chan.c
423a
return 0; /* not reached */
.
101a
return 0; /* not reached */
.
## diffname port/chan.c 1992/0619
## diff -e /n/bootesdump/1992/0520/sys/src/9/port/chan.c /n/bootesdump/1992/0619/sys/src/9/port/chan.c
255c
free(m);
.
241c
free(m);
.
181c
m = smalloc(sizeof(Mhead));
.
94d
## diffname port/chan.c 1992/0620
## diff -e /n/bootesdump/1992/0619/sys/src/9/port/chan.c /n/bootesdump/1992/0620/sys/src/9/port/chan.c
101c
/* if you get an error before associating with a dev,
close calls rootclose, a nop */
c->type = 0;
c->flag = 0;
c->ref = 1;
c->dev = 0;
c->offset = 0;
c->mnt = 0;
c->stream = 0;
c->aux = 0;
c->mchan = 0;
c->mqid = (Qid){0, 0};
return c;
.
79,99c
SET(nfid);
lock(&chanalloc);
c = chanalloc.free;
if(c)
chanalloc.free = c->next;
else
nfid = ++chanalloc.fid;
unlock(&chanalloc);
if(c == 0) {
c = smalloc(sizeof(Chan));
c->fid = nfid;
.
77a
int nfid;
.
41,56d
10a
int fid;
.
8c
struct
{
.
## diffname port/chan.c 1992/0711
## diff -e /n/bootesdump/1992/0620/sys/src/9/port/chan.c /n/bootesdump/1992/0711/sys/src/9/port/chan.c
671,672c
int w;
char *end;
.
435c
char *elem;
.
30,31d
## diffname port/chan.c 1992/0811
## diff -e /n/bootesdump/1992/0711/sys/src/9/port/chan.c /n/bootesdump/1992/0811/sys/src/9/port/chan.c
546a
if(omode & ORCLOSE)
c->flag |= CRCLOSE;
.
## diffname port/chan.c 1992/0825
## diff -e /n/bootesdump/1992/0811/sys/src/9/port/chan.c /n/bootesdump/1992/0825/sys/src/9/port/chan.c
475c
}
else {
.
461c
}
else
if(name[0] == '#') {
.
455c
if(name[0] == '/') {
.
314a
}
.
309c
for(t = f->mount; t; t = t->next) {
.
## diffname port/chan.c 1992/0919
## diff -e /n/bootesdump/1992/0825/sys/src/9/port/chan.c /n/bootesdump/1992/0919/sys/src/9/port/chan.c
648,651d
## diffname port/chan.c 1992/1217
## diff -e /n/bootesdump/1992/0919/sys/src/9/port/chan.c /n/bootesdump/1992/1217/sys/src/9/port/chan.c
471d
468c
t = devno(r, 1);
.
466c
name++;
name += chartorune(&r, name);
if(r == 'M')
.
431a
Rune r;
.
54c
for(i=0; i<devchar[i]; i++)
.
45c
for(i=0; i<devchar[i]; i++)
.
## diffname port/chan.c 1993/0123
## diff -e /n/bootesdump/1992/1217/sys/src/9/port/chan.c /n/bootesdump/1993/0123/sys/src/9/port/chan.c
687c
while(name < nend){
.
679,682c
nend = utfrune(name, '/');
if(nend == 0)
nend = strchr(name, 0);
w = nend-name;
.
674c
char *nend;
.
## diffname port/chan.c 1993/0330
## diff -e /n/bootesdump/1993/0123/sys/src/9/port/chan.c /n/bootesdump/1993/0330/sys/src/9/port/chan.c
97a
if(c->session){
freesession(c->session);
c->session = 0;
}
.
## diffname port/chan.c 1993/0501
## diff -e /n/bootesdump/1993/0330/sys/src/9/port/chan.c /n/fornaxdump/1993/0501/sys/src/brazil/port/chan.c
691c
while(name < end){
.
683,686c
end = utfrune(name, '/');
if(end == 0)
end = strchr(name, 0);
w = end-name;
.
678c
char *end;
.
609c
strcpy(createerr, up->error);
.
605,606c
* protect against the open/create race.
* This is not a complete fix. It just reduces the window.
.
588c
nc = walk(cc, elem, 1);
if(nc != 0) {
.
567c
nc = walk(c, elem, 0);
if(nc == 0)
.
563,565c
* When mounting on an already mounted upon directory,
* one wants subsequent mounts to be attached to the
* original directory, not the replacement.
.
546,547c
else {
nc = walk(c, elem, mntok);
if(nc == 0)
.
536c
nc = walk(c, elem, 0);
if(nc == 0)
.
524,525c
else {
nc = walk(c, elem, mntok);
if(nc == 0)
.
517,519d
506,511c
while(*name) {
nc = walk(c, elem, mntok);
if(nc == 0)
.
478,487c
c = (*devtab[t].attach)(elem+n);
name = skipslash(name);
break;
default:
c = clone(up->dot, 0);
name = skipslash(name);
.
471,474c
elem[0] = 0;
n = 0;
while(*name && (*name != '/' || n < 2))
elem[n++] = *name++;
elem[n] = '\0';
n = chartorune(&r, elem+1)+1;
if(r == 'M') {
name = skipslash(name);
if(*name)
error(Eperm);
return mchan(elem+n);
}
.
467,469c
break;
case '#':
.
461,465c
switch(name[0]) {
case '/':
c = clone(up->slash, 0);
.
458c
elem = up->elem;
.
452c
while(vmemchr(p, 0, t) == 0) {
.
445,449c
if(!((ulong)name & KZERO)) {
.
439a
int t, n;
int mntok, isdot;
Chan *c, *nc, *cc;
.
437d
434,435d
421a
Chan*
mchan(char *id)
{
Chan *c;
Pgrp *pg;
Mount *t;
int mdev;
ulong mountid;
Mhead **h, **he, *f;
mountid = strtoul(id, 0, 0);
mdev = devno('M', 0);
pg = up->pgrp;
rlock(&pg->ns);
if(waserror()) {
runlock(&pg->ns);
nexterror();
}
he = &pg->mnthash[MNTHASH];
for(h = pg->mnthash; h < he; h++) {
for(f = *h; f; f = f->hash) {
for(t = f->mount; t; t = t->next) {
c = t->to;
if(c->type == mdev && c->mntptr->id == mountid) {
c = c->mntptr->c;
incref(c);
runlock(&pg->ns);
poperror();
return c;
}
}
}
}
error(Enonexist);
return 0;
}
.
402c
pg = up->pgrp;
.
388a
close(ac);
.
387c
c = domount(c);
poperror();
.
375,385c
if(c == 0)
return 0;
if(dotdot)
c = undomount(c);
c->mnt = 0;
if(domnt) {
if(waserror()) {
close(c);
nexterror();
.
357c
c = 0;
pg = up->pgrp;
.
339,341c
if(name[0] == '.' && name[1] == '.' && name[2] == '\0') {
.
335c
if(name[0] == '\0')
.
331c
Chan *c;
.
303c
pg = up->pgrp;
.
284a
nc->xmnt = nc->mnt;
.
273c
pg = up->pgrp;
.
214c
pg = up->pgrp;
.
188c
nm = newmount(m, new, flag, spec);
.
180c
m->mount = newmount(m, old, 0, 0);
.
159c
pg = up->pgrp;
.
149d
146a
int order;
.
144c
mount(Chan *new, Chan *old, int flag, char *spec)
.
121a
chanfree(c);
}
.
120a
/* ASSERT */
if(c->path && c->path->ref == 0) {
char buf[64];
ptpath(c->path, buf, sizeof(buf));
print(">>%s %c %d %lux.%lux\n",
buf, devchar[c->type], c->dev, c->qid.path, c->qid.vers);
.
114,119c
if(decref(c))
return;
if(!waserror()) {
(*devtab[c->type].close)(c);
poperror();
.
111c
if(c->flag&CFREE)
.
101a
/*
* Channel can be closed before a path is created or the last
* channel in a mount which has already cleared its pt names
*/
if(c->path)
decref(c->path);
.
97a
.
89a
c->path = 0;
.
76c
lock(&chanalloc);
c->fid = ++chanalloc.fid;
c->link = chanalloc.list;
chanalloc.list = c;
unlock(&chanalloc);
.
70,71d
68c
if(c != 0)
.
64,65d
62d
40a
chanrec(Mnt *m)
{
Chan *c;
lock(&chanalloc);
for(c = chanalloc.list; c; c = c->link)
if(c->mntptr == m)
c->flag |= CRECOV;
unlock(&chanalloc);
}
void
.
12a
Chan *free;
Chan *list;
.
11d
## diffname port/chan.c 1993/0511
## diff -e /n/fornaxdump/1993/0501/sys/src/brazil/port/chan.c /n/fornaxdump/1993/0511/sys/src/brazil/port/chan.c
99d
## diffname port/chan.c 1993/0526
## diff -e /n/fornaxdump/1993/0511/sys/src/brazil/port/chan.c /n/fornaxdump/1993/0526/sys/src/brazil/port/chan.c
67c
for(i=0; devchar[i]; i++)
.
58c
for(i=0; devchar[i]; i++)
.
## diffname port/chan.c 1993/1007
## diff -e /n/fornaxdump/1993/0526/sys/src/brazil/port/chan.c /n/fornaxdump/1993/1007/sys/src/brazil/port/chan.c
595a
nc = walk(c, elem, mntok);
if(nc == 0)
error(Enonexist);
c = nc;
.
590,594c
break;
.
588c
if(isdot) {
.
586c
switch(amode) {
.
## diffname port/chan.c 1993/1013
## diff -e /n/fornaxdump/1993/1007/sys/src/brazil/port/chan.c /n/fornaxdump/1993/1013/sys/src/brazil/port/chan.c
101a
c->mcp = 0;
.
## diffname port/chan.c 1993/1015
## diff -e /n/fornaxdump/1993/1013/sys/src/brazil/port/chan.c /n/fornaxdump/1993/1015/sys/src/brazil/port/chan.c
144,150d
## diffname port/chan.c 1993/1017
## diff -e /n/fornaxdump/1993/1015/sys/src/brazil/port/chan.c /n/fornaxdump/1993/1017/sys/src/brazil/port/chan.c
617a
if(omode == OEXEC)
c->flag |= CTEXT;
.
## diffname port/chan.c 1993/1018
## diff -e /n/fornaxdump/1993/1017/sys/src/brazil/port/chan.c /n/fornaxdump/1993/1018/sys/src/brazil/port/chan.c
619c
c->flag &= ~CCACHE;
c = (*devtab[c->type].open)(c, omode);
.
616,617c
saveregisters();
.
## diffname port/chan.c 1993/1111
## diff -e /n/fornaxdump/1993/1018/sys/src/brazil/port/chan.c /n/fornaxdump/1993/1111/sys/src/brazil/port/chan.c
266c
if(eqchan(f->to, mounted, 1) || eqchan(f->to->mchan, mounted, 1)) {
.
## diffname port/chan.c 1993/1114
## diff -e /n/fornaxdump/1993/1111/sys/src/brazil/port/chan.c /n/fornaxdump/1993/1114/sys/src/brazil/port/chan.c
541a
name = skipslash(name);
.
539,540c
if(amode != Aopen || omode != ORDWR)
.
## diffname port/chan.c 1993/1115
## diff -e /n/fornaxdump/1993/1114/sys/src/brazil/port/chan.c /n/fornaxdump/1993/1115/sys/src/brazil/port/chan.c
224c
for(f = nm; f->next; f = f->next)
;
f->next = m->mount;
.
214d
212a
if(new->mnt != 0) {
h = &nm->next;
for(um = new->mnt->next; um; um = um->next) {
flg = um->flag;
if(flg == 0)
flg = MAFTER;
f = newmount(m, um->to, flg, um->spec);
*h = f;
h = &f->next;
}
}
.
173a
Mount *nm, *f, *um, **h;
.
171,172c
int order, flg;
.
## diffname port/chan.c 1993/1121
## diff -e /n/fornaxdump/1993/1115/sys/src/brazil/port/chan.c /n/fornaxdump/1993/1121/sys/src/brazil/port/chan.c
553c
skipslash(name);
.
## diffname port/chan.c 1993/1216
## diff -e /n/fornaxdump/1993/1121/sys/src/brazil/port/chan.c /n/fornaxdump/1993/1216/sys/src/brazil/port/chan.c
222a
}
if(m->mount && order == MREPL) {
mountfree(m->mount);
m->mount = 0;
.
216,218d
213a
/*
* copy a union when binding it onto a directory
*/
flg = order;
if(order == MREPL)
flg = MAFTER;
.
207,211d
## diffname port/chan.c 1993/1217
## diff -e /n/fornaxdump/1993/1216/sys/src/brazil/port/chan.c /n/fornaxdump/1993/1217/sys/src/brazil/port/chan.c
202a
/*
* if this is a union mount, add the old
* node to the mount chain.
*/
.
197a
/*
* nothing mounted here yet. create a mount
* head and add to the hash table.
*/
.
## diffname port/chan.c 1994/0115
## diff -e /n/fornaxdump/1993/1217/sys/src/brazil/port/chan.c /n/fornaxdump/1994/0115/sys/src/brazil/port/chan.c
289a
/* BUG: Needs to be 2 pass */
.
## diffname port/chan.c 1994/0509
## diff -e /n/fornaxdump/1994/0115/sys/src/brazil/port/chan.c /n/fornaxdump/1994/0509/sys/src/brazil/port/chan.c
291c
if(eqchan(f->to, mounted, 1) ||
(f->to->mchan && eqchan(f->to->mchan, mounted, 1))) {
.
## diffname port/chan.c 1994/0812
## diff -e /n/fornaxdump/1994/0509/sys/src/brazil/port/chan.c /n/fornaxdump/1994/0812/sys/src/brazil/port/chan.c
133c
if(c == 0 || (c->flag&CFREE))
.
## diffname port/chan.c 1994/0813
## diff -e /n/fornaxdump/1994/0812/sys/src/brazil/port/chan.c /n/fornaxdump/1994/0813/sys/src/brazil/port/chan.c
133c
if(c->flag&CFREE)
.
## diffname port/chan.c 1994/1212
## diff -e /n/fornaxdump/1994/0813/sys/src/brazil/port/chan.c /n/fornaxdump/1994/1212/sys/src/brazil/port/chan.c
565,568c
c = mchan(elem+n);
name = skipslash(name);
break;
.
503,504c
c = clone(c, 0);
.
## diffname port/chan.c 1995/0208
## diff -e /n/fornaxdump/1994/1212/sys/src/brazil/port/chan.c /n/fornaxdump/1995/0208/sys/src/brazil/port/chan.c
564,565c
if(elem[n] == 'c') {
c = mchan(elem+n+1, 0);
name = skipslash(name);
if(*name)
error(Efilename);
return c;
}
else {
c = mchan(elem+n, 1);
name = skipslash(name);
}
.
503c
if(walkname == 0) {
c = c->mntptr->c;
incref(c);
}
else
c = clone(c, 0);
.
478c
mchan(char *id, int walkname)
.
## diffname port/chan.c 1996/0730
## diff -e /n/fornaxdump/1995/0208/sys/src/brazil/port/chan.c /n/fornaxdump/1996/0730/sys/src/brazil/port/chan.c
727a
if(omode & ORCLOSE)
c->flag |= CRCLOSE;
.
## diffname port/chan.c 1997/0327
## diff -e /n/fornaxdump/1996/0730/sys/src/brazil/port/chan.c /n/emeliedump/1997/0327/sys/src/brazil/port/chan.c
725c
devtab[c->type]->create(c, elem, omode, perm);
.
703c
cclose(cc);
.
698c
cclose(c);
.
691c
cclose(cc);
.
689c
cc = cclone(c, 0);
.
659c
c = devtab[c->type]->open(c, omode);
.
597c
cclose(c);
.
590c
c = cclone(up->dot, 0);
.
586c
c = devtab[t]->attach(elem+n);
.
557c
c = cclone(up->slash, 0);
.
508c
c = cclone(c, 0);
.
474c
return 0;
.
469c
cclose(c);
.
465c
nc = cclone(f->to, 0);
.
443c
cclose(ac);
.
437c
cclose(c);
.
422c
cclose(c);
.
419,420c
c = cclone(f->to, 0);
if(devtab[c->type]->walk(c, name) != 0)
.
415c
cclose(c);
.
397c
if(devtab[ac->type]->walk(ac, name) != 0) {
.
368,369c
cclose(c);
c = cclone(t->head->from, 0);
.
339c
cclose(c);
.
335c
nc = cclone(m->mount->to, 0);
.
315c
return devtab[c->type]->clone(c, nc);
.
313c
cclone(Chan *c, Chan *nc)
.
299c
cclose(m->from);
.
283c
cclose(m->from);
.
258c
cunmount(Chan *mnt, Chan *mounted)
.
168c
cmount(Chan *new, Chan *old, int flag, char *spec)
.
140c
devtab[c->type]->close(c);
.
134,135c
panic("cclose %lux", getcallerpc(c));
.
131c
cclose(Chan *c)
.
68c
devtab[i]->init();
.
59c
devtab[i]->reset();
.
## diffname port/chan.c 1997/0408
## diff -e /n/emeliedump/1997/0327/sys/src/brazil/port/chan.c /n/emeliedump/1997/0408/sys/src/brazil/port/chan.c
67c
for(i=0; devtab[i] != nil; i++)
.
58c
for(i=0; devtab[i] != nil; i++)
.
## diffname port/chan.c 1997/0813
## diff -e /n/emeliedump/1997/0408/sys/src/brazil/port/chan.c /n/emeliedump/1997/0813/sys/src/brazil/port/chan.c
418a
c->flag &= ~CCREATE; /* not inherited through a walk */
.
395a
ac->flag &= ~CCREATE; /* not inherited through a walk */
.
## diffname port/chan.c 1997/1121
## diff -e /n/emeliedump/1997/0813/sys/src/brazil/port/chan.c /n/emeliedump/1997/1121/sys/src/brazil/port/chan.c
368c
c = nc;
.
366a
nc = cclone(t->head->from, 0);
.
353a
Mhead **h, **he, *f;
.
352d
350a
Chan *nc;
.
## diffname port/chan.c 1997/1208
## diff -e /n/emeliedump/1997/1121/sys/src/brazil/port/chan.c /n/emeliedump/1997/1208/sys/src/brazil/port/chan.c
106a
int
okchan1(Chan *c)
{
if(c->type > 64)
return 0;
if((ulong)(c->next) & 3)
return 0;
if((ulong)(c->link) & 3)
return 0;
if((ulong)(c->path) & 3)
return 0;
if((ulong)(c->mnt) & 3)
return 0;
if((ulong)(c->xmnt) & 3)
return 0;
if((ulong)(c->mcp) & 3)
return 0;
if((ulong)(c->mchan) & 3)
return 0;
if((ulong)(c->session) & 3)
return 0;
return 1;
}
void
okchan(char *msg, int n)
{
int s;
Chan *c;
return;
s = splhi();
for(c = chanalloc.list; c; c = c->link)
if(!okchan1(c)){
spllo();
print("okchan: %s (%d=#%.8lux)\n", msg, n, n);
panic("okchan");
}
splx(s);
}
.
## diffname port/chan.c 1997/1210
## diff -e /n/emeliedump/1997/1208/sys/src/brazil/port/chan.c /n/emeliedump/1997/1210/sys/src/brazil/port/chan.c
140,144c
okchan1(c, msg, n);
.
137d
110,128c
int i, bad;
bad = 0;
if(c->type > 64){
print("bad type %d\n", c->type);
bad = 1;
}
if((ulong)(c->next) & 3){
print("bad next %.8lux\n", c->next);
bad = 1;
}
if((ulong)(c->link) & 3){
print("bad link %.8lux\n", c->link);
bad = 1;
}
if((ulong)(c->path) & 3){
print("bad path %.8lux\n", c->path);
bad = 1;
}
if((ulong)(c->mnt) & 3){
print("bad mnt %.8lux\n", c->mnt);
bad = 1;
}
if((ulong)(c->xmnt) & 3){
print("bad xmnt %.8lux\n", c->xmnt);
bad = 1;
}
if((ulong)(c->mcp) & 3){
print("bad mcp %.8lux\n", c->mcp);
bad = 1;
}
if((ulong)(c->mchan) & 3){
print("bad mchan %.8lux\n", c->mchan);
bad = 1;
}
if((ulong)(c->session) & 3){
print("bad session %.8lux\n", c->session);
bad = 1;
}
if(!bad)
return;
print("okchan: %s (%d=#%.8lux)\n", msg, n, n);
for(i=0; i<16; i++){
print("%d=%.8lux\n", i, ((ulong*)c)[i]);
if((i&7) == 7)
print("\n");
}
for(;;);
.
107,108c
void
okchan1(Chan *c, char *msg, int n)
.
## diffname port/chan.c 1997/1211
## diff -e /n/emeliedump/1997/1210/sys/src/brazil/port/chan.c /n/emeliedump/1997/1211/sys/src/brazil/port/chan.c
166a
return;
.
## diffname port/chan.c 1998/0221
## diff -e /n/emeliedump/1997/1211/sys/src/brazil/port/chan.c /n/emeliedump/1998/0221/sys/src/brazil/port/chan.c
108,174d
## diffname port/chan.c 1998/0224
## diff -e /n/emeliedump/1998/0221/sys/src/brazil/port/chan.c /n/emeliedump/1998/0224/sys/src/brazil/port/chan.c
724d
721,722c
if(walk(&c, elem, 1) < 0)
.
702c
c = cc;
.
698,699c
if(walk(&cc, elem, 1) == 0){
.
679d
676,677c
if(walk(&c, elem, 0) < 0)
.
653d
650,651c
if(walk(&c, elem, mntok) < 0)
.
641d
638,639c
if(walk(&c, elem, 0) < 0)
.
630d
627,628c
if(walk(&c, elem, mntok) < 0)
.
617d
614,615c
if(walk(&c, elem, mntok) < 0)
.
540c
Chan *c, *cc;
.
447c
*cp = c;
return 0;
.
431,432c
if(c == nil)
return -1;
.
426c
c = nil;
.
410c
c = nil;
.
407,408c
if(ac->mnt == nil)
return -1;
.
403,404c
*cp = domount(*cp);
return 0;
.
401c
*cp = undomount(*cp);
.
394c
*cp = ac = undomount(ac);
.
390c
return 0;
.
388a
ac = *cp;
.
385c
Chan *c, *ac;
.
381,382c
int
walk(Chan **cp, char *name, int domnt)
.
## diffname port/chan.c 1998/0416
## diff -e /n/emeliedump/1998/0224/sys/src/brazil/port/chan.c /n/emeliedump/1998/0416/sys/src/brazil/port/chan.c
122a
}
.
121c
if(c->path) {
if (c->path->ref <= 0) {
char buf[100];
ptpath(c->path, buf, sizeof(buf));
print("decref %s\n", buf);
}
.
## diffname port/chan.c 1998/0512
## diff -e /n/emeliedump/1998/0416/sys/src/brazil/port/chan.c /n/emeliedump/1998/0512/sys/src/brazil/port/chan.c
674c
* one wants subsequent mounts to be attached to the
.
662c
.
456c
return 0;
.
415c
if(ac->mnt == nil)
.
345,346c
c = nc;
break;
.
217c
if(order != MREPL)
.
128c
}
.
123,126c
char buf[100];
ptpath(c->path, buf, sizeof(buf));
print("decref %s\n", buf);
}
.
35c
if(x < 0)
.
## diffname port/chan.c 1998/0813
## diff -e /n/emeliedump/1998/0512/sys/src/brazil/port/chan.c /n/emeliedump/1998/0813/sys/src/brazil/port/chan.c
606a
c->mnt = nil;
.
## diffname port/chan.c 1998/0829
## diff -e /n/emeliedump/1998/0813/sys/src/brazil/port/chan.c /n/emeliedump/1998/0829/sys/src/brazil/port/chan.c
814a
}
void
putmhead(Mhead *m)
{
if(decref(m) == 0)
free(m);
.
711c
if(c->mh != nil && !(c->flag&CCREATE))
.
607d
478,479c
if(nc->mh != nil)
putmhead(nc->mh);
nc->mh = c->mh;
incref(c->mh);
runlock(&c->mh->lock);
.
475c
for(f = c->mh->mount; f; f = f->next) {
.
472c
runlock(&c->mh->lock);
.
469,470c
rlock(&c->mh->lock);
.
465d
445c
if(c->mh){
putmhead(c->mh);
c->mh = nil;
}
.
437c
runlock(&ac->mh->lock);
.
428c
for(f = ac->mh->mount; f; f = f->next) {
.
423c
runlock(&ac->mh->lock);
.
421c
rlock(&ac->mh->lock);
.
419d
415c
if(ac->mh == nil)
.
390d
349d
347a
runlock(&m->lock);
}
.
346c
poperror();
runlock(&m->lock);
return c;
.
341,343c
if(nc->mh != nil)
putmhead(nc->mh);
nc->mh = m;
nc->xmh = m;
incref(m);
.
339a
if(waserror()) {
runlock(&m->lock);
nexterror();
}
runlock(&pg->ns);
.
338c
for(m = MOUNTH(pg, c); m; m = m->hash){
rlock(&m->lock);
.
336d
332,334c
if(c->mh){
putmhead(c->mh);
c->mh = 0;
.
313c
wunlock(&m->lock);
.
308c
wunlock(&m->lock);
.
305c
wunlock(&m->lock);
putmhead(m);
.
301c
if(m->mount == nil) {
.
291a
wunlock(&pg->ns);
.
289c
wunlock(&m->lock);
putmhead(m);
.
287a
m->mount = nil;
.
283a
wlock(&m->lock);
.
257c
wunlock(&m->lock);
.
230c
um = new->mh->mount;
for(um = um->next; um; um = um->next) {
.
222c
if(new->mh != nil && new->mh->mount != nil) {
.
219a
wlock(&m->lock);
if(waserror()){
wunlock(&m->lock);
nexterror();
}
wunlock(&pg->ns);
.
207a
m->ref = 1;
.
190,193d
116a
if(c->mh != nil){
putmhead(c->mh);
c->mh = nil;
}
.
98c
c->mh = 0;
c->xmh = 0;
c->uri = 0;
.
## diffname port/chan.c 1999/0122
## diff -e /n/emeliedump/1998/0829/sys/src/brazil/port/chan.c /n/emeliedump/1999/0122/sys/src/brazil/port/chan.c
752c
devtab[c->type]->create(c, elem, omode&~OCEXEC, perm);
.
691c
c = devtab[c->type]->open(c, omode&~OCEXEC);
.
## diffname port/chan.c 1999/0323
## diff -e /n/emeliedump/1999/0122/sys/src/brazil/port/chan.c /n/emeliedump/1999/0323/sys/src/brazil/port/chan.c
788c
/* [' '] 1, rob - let's try this out */
.
## diffname port/chan.c 1999/0501
## diff -e /n/emeliedump/1999/0323/sys/src/brazil/port/chan.c /n/emeliedump/1999/0501/sys/src/brazil/port/chan.c
147c
panic("cclose %lux", getcallerpc(&c));
.
## diffname port/chan.c 1999/0629
## diff -e /n/emeliedump/1999/0501/sys/src/brazil/port/chan.c /n/emeliedump/1999/0629/sys/src/brazil/port/chan.c
762a
poperror();
/* peculiar workaround for #/ */
if(newname){
if(cname->s[0]=='#' && cname->s[1]=='/')
cleanname(cname, 2);
else
cleanname(cname, 0);
cnameclose(c->name);
c->name = cname;
}else
cnameclose(cname);
.
691a
if(cc != c)
newname = 0;
.
690a
cc = c;
.
629a
cname = newcname(up->dot->name->s);
cname = addelem(cname, name);
.
613a
poperror();
cnameclose(cname);
.
600a
cname = newcname(name); /* save this before advancing */
.
598a
c = cclone(up->slash, 0);
.
597c
cname = newcname(name); /* save this before advancing */
.
591a
newname = 1;
cname = nil;
if(waserror()){
cnameclose(cname);
nexterror();
}
.
575c
Cname *cname;
int t, n, newname;
.
565a
* In place, rewrite name to compress multiple /, eliminate ., and process ..
*/
void
cleanname(Cname *n, int offset)
{
char *p, *q, *dotdot, *name;
int rooted;
name = n->s+offset;
rooted = name[0] == '/';
/*
* invariants:
* p points at beginning of path element we're considering.
* q points just past the last path element we wrote (no slash).
* dotdot points just past the point where .. cannot backtrack
* any further (no slash).
*/
p = q = dotdot = name+rooted;
while(*p) {
if(p[0] == '/') /* null element */
p++;
else if(p[0] == '.' && SEP(p[1]))
p += 1; /* don't count the separator in case it is nul */
else if(p[0] == '.' && p[1] == '.' && SEP(p[2])) {
p += 2;
if(q > dotdot) { /* can backtrack */
while(--q > dotdot && *q != '/')
;
} else if(!rooted) { /* ``/..'' ≡ ``/'', but ``./../'' ≡ ``..'' */
if(q != name)
*q++ = '/';
*q++ = '.';
*q++ = '.';
dotdot = q;
}
} else { /* real path element */
if(q != name+rooted)
*q++ = '/';
while((*q = *p) != '/' && *q != 0)
p++, q++;
}
}
if(q == name) /* empty string is really ``.'' */
*q++ = '.';
*q = 0;
n->len = (q-name) + offset;
}
/*
.
413a
walkname(Chan **cp, char *name, int domnt)
{
Chan *c;
if(walk(cp, name, domnt) < 0)
return -1;
c = *cp;
if(c->name == nil)
c->name = newcname(name);
else
c->name = addelem(c->name, name);
return 0;
}
int
.
336c
nc = devtab[c->type]->clone(c, nc);
if(nc != nil){
nc->name = c->name;
if(c->name)
incref(c->name);
}
return nc;
.
124,135c
cnameclose(c->name);
.
109a
cnameclose(Cname *n)
{
if(n == 0)
return;
if(decref(n))
return;
decref(&ncname);
free(n->s);
free(n);
}
Cname*
addelem(Cname *n, char *s)
{
int i, a;
char *t;
Cname *new;
if(n->ref > 1){
/* copy on write */
new = newcname(n->s);
cnameclose(n);
n = new;
}
i = strlen(s);
if(n->len+1+i+1 < n->alen){
a = n->len+1+i+1 + CNAMESLOP;
t = smalloc(a);
memmove(t, n->s, n->len+1);
free(n->s);
n->s = t;
n->alen = a;
}
n->s[n->len++] = '/';
memmove(n->s+n->len, s, i+1);
n->len += i;
return n;
}
void
.
108a
static Ref ncname;
Cname*
newcname(char *s)
{
Cname *n;
int i;
n = smalloc(sizeof(Cname));
i = strlen(s);
n->len = i;
n->alen = i+CNAMESLOP;
n->s = smalloc(n->alen);
memmove(n->s, s, i+1);
n->ref = 1;
incref(&ncname);
return n;
}
.
105a
c->name = 0;
.
103d
15a
#define SEP(c) ((c) == 0 || (c) == '/')
.
7a
enum
{
CNAMESLOP = 20
};
.
## diffname port/chan.c 1999/0630
## diff -e /n/emeliedump/1999/0629/sys/src/brazil/port/chan.c /n/emeliedump/1999/0630/sys/src/brazil/port/chan.c
162c
if(n->len+1+i+1 > n->alen){
.
## diffname port/chan.c 1999/0716
## diff -e /n/emeliedump/1999/0630/sys/src/brazil/port/chan.c /n/emeliedump/1999/0716/sys/src/brazil/port/chan.c
915c
cleancname(cname, 0);
.
913c
cleancname(cname, 1);
.
688c
*q = '\0';
.
672c
} else if(!rooted) { /* /.. is / but ./../ is .. */
.
646c
cleancname(Cname *n, int offset)
.
## diffname port/chan.c 1999/0718
## diff -e /n/emeliedump/1999/0716/sys/src/brazil/port/chan.c /n/emeliedump/1999/0718/sys/src/brazil/port/chan.c
959c
if(!slashok || *elem!='/')
error(Ebadchar);
.
952c
nameok(char *elem, int slashok)
.
868c
nameok(elem, 0);
.
## diffname port/chan.c 1999/0811
## diff -e /n/emeliedump/1999/0718/sys/src/brazil/port/chan.c /n/emeliedump/1999/0811/sys/src/brazil/port/chan.c
513c
*cp = domount(c);
.
510,511c
/* walk succeeded: update name associated with *cp (ac) */
c = *cp;
if(c->name == nil)
c->name = newcname(name);
else
c->name = addelem(c->name, name);
if(dotdot){
cleancname(c->name, c->name->s[0]=='#'); /* could be cheaper */
*cp = undomount(c);
}
.
476,490d
462a
/* don't need to update nc->name because c->name is same! */
.
461a
/*
* We want to come out on the left hand side of the mount
* point using the element of the union that we entered on.
* To do this, find the element that has a from name of
* c->name->s.
*/
if(strcmp(t->head->from->name->s, c->name->s) != 0)
continue;
.
428a
cnameclose(nc->name);
nc->name = c->name;
incref(c->name);
.
21a
void cleancname(Cname*, int);
.
## diffname port/chan.c 1999/0820
## diff -e /n/emeliedump/1999/0811/sys/src/brazil/port/chan.c /n/emeliedump/1999/0820/sys/src/brazil/port/chan.c
520c
*cp = domount(*cp);
.
## diffname port/chan.c 1999/1105
## diff -e /n/emeliedump/1999/0820/sys/src/brazil/port/chan.c /n/emeliedump/1999/1105/sys/src/9/port/chan.c
50,61d
## diffname port/chan.c 1999/1224
## diff -e /n/emeliedump/1999/1105/sys/src/9/port/chan.c /n/emeliedump/1999/1224/sys/src/9/port/chan.c
737a
}
.
736c
while(*name && (*name != '/' || n < 2)){
if(n >= NAMELEN-1)
error(Efilename);
.
554a
if(domnt)
*cp = domount(c);
.
545,552c
/* replace c->name by ac->name */
cnameclose(c->name);
c->name = ac->name;
if(ac->name)
incref(ac->name);
c = updatecname(c, name, dotdot);
.
538,540d
497,506c
*cp = updatecname(*cp, name, dotdot);
.
475a
Chan *
updatecname(Chan *c, char *name, int dotdot)
{
if(c->name == nil)
c->name = newcname(name);
else
c->name = addelem(c->name, name);
if(dotdot){
cleancname(c->name, c->name->s[0]=='#'); /* could be cheaper */
c = undomount(c);
}
return c;
}
.
159c
if(n->len>0 && n->s[n->len-1]!='/' && s[0]!='/') /* don't insert extra slash if one is present */
n->s[n->len++] = '/';
.
## diffname port/chan.c 1999/1230
## diff -e /n/emeliedump/1999/1224/sys/src/9/port/chan.c /n/emeliedump/1999/1230/sys/src/9/port/chan.c
916,919c
cleancname(cname);
.
914d
655,690c
/*
* The correct name is #i rather than #i/,
* but the correct name of #/ is #/.
*/
if(strcmp(p, "/")==0 && n->s[1] != '/')
*p = '\0';
}else
cleanname(n->s);
n->len = strlen(n->s);
.
652,653c
if(n->s[0] == '#'){
p = strchr(n->s, '/');
if(p == nil)
return;
cleanname(p);
.
649,650c
char *p;
.
647c
cleancname(Cname *n)
.
486c
cleancname(c->name); /* could be cheaper */
.
22c
void cleancname(Cname*);
.
## diffname port/chan.c 2000/0322
## diff -e /n/emeliedump/1999/1230/sys/src/9/port/chan.c /n/emeliedump/2000/0322/sys/src/9/port/chan.c
712a
/*
* noattach is sandboxing.
*
* the OK exceptions are:
* | it only gives access to pipes you create
* d this process's file descriptors
* e this process's environment
* the iffy exceptions are:
* c time and pid, but also cons and consctl
* p control of your own processes (and unfortunately
* any others left unprotected)
*/
if(up->pgrp->noattach)
if(strchr("|decp", name[1]) == 0)
error(Enoattach);
.
## diffname port/chan.c 2000/0326
## diff -e /n/emeliedump/2000/0322/sys/src/9/port/chan.c /n/emeliedump/2000/0326/sys/src/9/port/chan.c
723a
* all are ASCII, so it's safe to use strchr to check.
.
## diffname port/chan.c 2000/0330
## diff -e /n/emeliedump/2000/0326/sys/src/9/port/chan.c /n/emeliedump/2000/0330/sys/src/9/port/chan.c
740,755c
/* actually / is caught by parsing earlier */
if(utfrune("M", r))
error(Enoattach);
if(up->pgrp->noattach && utfrune("|decp", r))
error(Enoattach);
.
726,738d
724d
712a
cname = newcname(name); /* save this before advancing */
mntok = 0;
elem[0] = 0;
n = 0;
while(*name && (*name != '/' || n < 2)){
if(n >= NAMELEN-1)
error(Efilename);
elem[n++] = *name++;
}
elem[n] = '\0';
.
595,637d
## diffname port/chan.c 2000/0904
## diff -e /n/emeliedump/2000/0330/sys/src/9/port/chan.c /n/emeliedump/2000/0904/sys/src/9/port/chan.c
644c
if(((ulong)name & KZERO) != KZERO) {
.
## diffname port/chan.c 2000/1124
## diff -e /n/emeliedump/2000/0904/sys/src/9/port/chan.c /n/emeliedump/2000/1124/sys/src/9/port/chan.c
696c
if(up->pgrp->noattach && utfrune("|decp", r)==nil)
.
## diffname port/chan.c 2001/0214
## diff -e /n/emeliedump/2000/1124/sys/src/9/port/chan.c /n/emeliedump/2001/0214/sys/src/9/port/chan.c
364d
## diffname port/chan.c 2001/0424
## diff -e /n/emeliedump/2001/0214/sys/src/9/port/chan.c /n/emeliedump/2001/0424/sys/src/9/port/chan.c
666a
if(*name == 0)
isdot = 1;
.
## diffname port/chan.c 2001/0502
## diff -e /n/emeliedump/2001/0424/sys/src/9/port/chan.c /n/emeliedump/2001/0502/sys/src/9/port/chan.c
202a
poperror();
.
201a
devtab[c->type]->close(c);
.
197,199c
if(waserror()){
print("cclose error: type %C; error %s\n", devtab[c->type]->dc, up!=nil? up->error : "no user"); //BUG
return;
.
## diffname port/chan.c 2001/0503
## diff -e /n/emeliedump/2001/0502/sys/src/9/port/chan.c /n/emeliedump/2001/0503/sys/src/9/port/chan.c
204a
chanfree(c);
.
203d
198a
chanfree(c);
.
## diffname port/chan.c 2001/0504
## diff -e /n/emeliedump/2001/0503/sys/src/9/port/chan.c /n/emeliedump/2001/0504/sys/src/9/port/chan.c
198c
// print("cclose error: type %C; error %s\n", devtab[c->type]->dc, up!=nil? up->error : "no user");
.
## diffname port/chan.c 2001/0527
## diff -e /n/emeliedump/2001/0504/sys/src/9/port/chan.c /n/emeliedump/2001/0527/sys/src/9/port/chan.c
944a
}
.
943c
if(m && decref(m) == 0){
decref(&mheadcounter);
m->mount = (Mount*)0xCafeBeef;
.
939a
/*
* This is necessary because there are many
* pointers to the top of a given mount list:
*
* - the mhead in the namespace hash table
* - the mhead in chans returned from findmount:
* used in namec and then by unionread.
* - the mhead in chans returned from createdir:
* used in the open/create race protect, which is gone.
*
* The RWlock in the Mhead protects the mount list it contains.
* The mount list is deleted when we cunmount.
* The RWlock ensures that nothing is using the mount list at that time.
*
* It is okay to replace c->mh with whatever you want as
* long as you are sure you have a unique reference to it.
*
* This comment might belong somewhere else.
*/
.
935c
if(c->qid.type & QTDIR)
.
929d
914,927c
if(((ulong)name & KZERO) != KZERO) {
p = name;
t = BY2PG-((ulong)p&(BY2PG-1));
while((ename=vmemchr(p, 0, t)) == nil) {
p += t;
t = BY2PG;
}
}else
ename = memchr(name, 0, (1<<16));
if(ename==nil || ename-name>=(1<<16))
error("name too long");
while(*name){
/* all characters above '~' are ok */
c = *(uchar*)name;
if(c >= Runeself)
name += chartorune(&r, name);
else{
if(isfrog[c])
if(!slashok || c!='/')
error(Ebadchar);
name++;
}
.
910,911c
char *p, *ename;
uint t;
int c;
.
907,908c
void
validname(char *name, int slashok)
.
905c
* Check that the name
* a) is in valid memory.
* b) is shorter than 2^16 bytes, so it can fit in a 9P string field.
* c) contains no frogs.
* The first byte is known to be addressible by the requester, so the
* routine works for kernel and user memory both.
* The parameter slashok flags whether a slash character is an error
* or a valid character.
.
888,903d
883d
871c
if(*name=='.' && (name[1]=='\0' || name[1]=='/')){
.
863c
* name is valid. skip leading / and ./ and trailing .
.
851,858c
/* place final element in genbuf for e.g. exec */
if(e.nelems > 0)
kstrcpy(up->genbuf, e.elems[e.nelems-1], sizeof up->genbuf);
else
kstrcpy(up->genbuf, ".", sizeof up->genbuf);
free(e.name);
free(e.elems);
.
837,843c
panic("namec: not reached");
.
826,833c
/*
* We need our own copy of the Chan because we're
* about to send a create, which will move it. Once we have
* our own copy, we can fix the name, which might be wrong
* if findmount gave us a new Chan.
*/
cnew = cunique(cnew);
cnameclose(cnew->name);
cnew->name = c->name;
incref(cnew->name);
devtab[cnew->type]->create(cnew, e.elems[e.nelems-1], omode&~(OEXCL|OCEXEC), perm);
poperror();
if(omode & OCEXEC)
cnew->flag |= CCEXEC;
if(omode & ORCLOSE)
cnew->flag |= CRCLOSE;
if(m)
putmhead(m);
cclose(c);
c = cnew;
break;
}else{ /* create failed */
cclose(cnew);
if(m)
putmhead(m);
if(omode & OEXCL)
nexterror();
if(walk(&c, e.elems+e.nelems-1, 1, nomount) < 0)
nexterror();
.
823,824c
m = nil;
cnew = nil; /* is this assignment necessary? */
if(!waserror()){ /* try create */
if(!nomount && findmount(&cnew, &m, c->type, c->dev, c->qid))
cnew = createdir(cnew, m);
else{
cnew = c;
incref(cnew);
}
.
821c
* The semantics of the create(2) system call are that if the
* file exists and can be written, it is to be opened with truncation.
* On the other hand, the create(5) message fails if the file exists.
* If we get two create(2) calls happening simultaneously,
* they might both get here and send create(5) messages, but only
* one of the messages will succeed. To provide the expected create(2)
* semantics, the call with the failed message needs to try the above
* walk again, opening for truncation. This correctly solves the
* create/create race, in the sense that any observable outcome can
* be explained as one happening before the other.
* The create/create race is quite common. For example, it happens
* when two rc subshells simultaneously update the same
* environment variable.
*
* The implementation still admits a create/create/remove race:
* (A) walk to file, fails
* (B) walk to file, fails
* (A) create file, succeeds, returns
* (B) create file, fails
* (A) remove file, succeeds, returns
* (B) walk to file, return failure.
*
* This is hardly as common as the create/create race, and is really
* not too much worse than what might happen if (B) got a hold of a
* file descriptor and then the file was removed -- either way (B) can't do
* anything with the result of the create call. So we don't care about this race.
*
* Applications that care about more fine-grained decision of the races
* can use the OEXCL flag to get at the underlying create(5) semantics;
* by default we provide the common case.
*
* We need to stay behind the mount point in case we
* need to do the first walk again (should the create fail).
*
* We also need to cross the mount point and find the directory
* in the union in which we should be creating.
*
* The channel staying behind is c, the one moving forward is cnew.
.
817,818d
804,813c
e.nelems++;
if(walk(&c, e.elems+e.nelems-1, 1, nomount) == 0){
if(omode&OEXCL){
cclose(c);
error(Eexist);
}
.
799,802c
* We've already walked all but the last element.
* If the last exists, try to open it OTRUNC.
* If omode&OEXCL is set, just give up.
.
795,797d
790,791d
788c
* original directory, not the replacement. Don't domount.
.
783a
case Atodir:
/*
* Directories (e.g. for cd) are left before the mount point,
* so one may mount on / or . and see the effect.
*/
if(!(c->qid.type & QTDIR))
error(Enotdir);
break;
.
775,776d
773d
767c
/* save the name; domount might change c */
cname = c->name;
incref(cname);
m = nil;
if(!nomount)
domount(&c, &m);
/* our own copy to open or remove */
c = cunique(c);
/* now it's our copy anyway, we can put the name back */
cnameclose(c->name);
c->name = cname;
if(amode == Aremove){
putmhead(m);
break;
}
if(c->umh != nil){
print("cunique umh\n");
putmhead(c->umh);
}
c->umh = m;
/* save registers else error() in open has wrong value of c saved */
.
760,765d
748,758c
case Aremove:
.
740,745c
if(!nomount)
domount(&c, nil);
.
738c
if(walk(&c, e.elems, e.nelems, nomount) < 0)
error(Enonexist);
switch(amode){
.
732,735c
/*
* On create, don't try to walk the last path element just yet.
*/
if(amode == Acreate){
if(e.nelems == 0)
error(Eisdir);
e.nelems--;
.
729,730c
parsename(name, &e);
.
726,727c
* Build a list of elements in the path.
.
723,724d
719a
free(e.name);
free(e.elems);
//dumpmount();
.
718a
if(strcmp(up->error, Enonexist) == 0){
if(strlen(aname) < ERRMAX/3 || (name=strrchr(aname, '/'))==nil || name==aname)
snprint(up->error, sizeof up->error, "\"%s\" does not exist", aname);
else
snprint(up->error, sizeof up->error, "file \"...%s\" does not exist", name);
}
.
717a
e.name = nil;
e.elems = nil;
.
714,715c
break;
.
710,712c
c = up->dot;
incref(c);
.
708a
.
705,707c
c = devtab[t]->attach(up->genbuf+n);
.
696c
n = chartorune(&r, up->genbuf+1)+1;
.
683c
up->genbuf[n] = '\0';
.
681c
up->genbuf[n++] = *name++;
.
678,679c
while(*name!='\0' && (*name != '/' || n < 2)){
if(n >= sizeof(up->genbuf)-1)
.
674,676c
nomount = 1;
up->genbuf[0] = '\0';
.
672a
.
669,671d
667c
c = up->slash;
incref(c);
.
646,665c
/*
* Find the starting off point (the current slash, the root of
* a device tree, or the current dot) as well as the name to
* evaluate starting there.
*/
nomount = 0;
switch(name[0]){
.
643,644c
name = aname;
if(name[0] == '\0')
error("empty file name");
validname(name, 1);
.
638,641c
Elemlist e;
Rune r;
Mhead *m;
char *name;
.
634,636c
int n, t, nomount;
Chan *c, *cnew;
.
632c
namec(char *aname, int amode, int omode, ulong perm)
.
629a
*
* Opening with amode Aopen, Acreate, or Aremove guarantees
* that the result will be the only reference to that particular fid.
* This is necessary since we might pass the result to
* devtab[]->remove().
*
* Opening Atodir, Amount, or Aaccess does not guarantee this.
*
* Opening Aaccess can, under certain conditions, return a
* correct Chan* but with an incorrect Cname attached.
* Since the functions that open Aaccess (sysstat, syswstat, sys_stat)
* do not use the Cname*, this avoids an unnecessary clone.
.
627a
* The name is known to be valid.
* Copy the name so slashes can be overwritten.
* An empty string will set nelem=0.
*/
static void
parsename(char *name, Elemlist *e)
{
char *slash;
kstrdup(&e->name, name);
name = e->name;
e->nelems = 0;
e->elems = nil;
for(;;){
name = skipslash(name);
if(*name=='\0')
break;
growparse(e);
e->elems[e->nelems++] = name;
slash = utfrune(name, '/');
if(slash == nil)
break;
*slash++ = '\0';
name = slash;
}
}
/*
.
626a
static void
growparse(Elemlist *e)
{
char **new;
enum { Delta = 8 };
if(e->nelems % Delta == 0){
new = smalloc((e->nelems+Delta) * sizeof(char*));
memmove(new, e->elems, e->nelems*sizeof(char*));
free(e->elems);
e->elems = new;
}
}
.
580,587c
for(f = m->mount; f; f = f->next) {
if(f->mflag&MCREATE) {
nc = cclone(f->to);
runlock(&m->lock);
.
577c
runlock(&m->lock);
.
575c
rlock(&m->lock);
.
570c
createdir(Chan *c, Mhead *m)
.
561,562c
cclose(*cp);
*cp = c;
if(chandebug) print("success\n");
.
554,559c
c->name = cname;
.
552c
putmhead(mh);
c = cunique(c);
if(c->umh != nil){
print("walk umh\n");
putmhead(c->umh);
c->umh = nil;
}
.
547,549c
names += n;
nnames -= n;
//print("nc %s nnames %d devchar %C qid %.8llux\n", cname->s, nnames, devtab[c->type]->dc, c->qid.path);
free(wq);
.
544,545c
for(i=0; i<n; i++)
cname = addelem(cname, names[i]);
.
539,542c
c = nc;
putmhead(mh);
mh = nmh;
.
526,537c
if((wq = devtab[type]->walk(c, nil, names, ntry)) == nil){
if(chandebug) print("walk failed.");
/* try a union mount, if any */
if(mh == nil || nomount){
Giveup:
if(chandebug) print("give up\n");
//delay(2000);
cclose(c);
cnameclose(cname);
return -1;
}
rlock(&mh->lock);
if(waserror()){
runlock(&mh->lock);
nexterror();
}
for(f = mh->mount; f; f = f->next)
{
if(chandebug) print("\ttry chan: qid %.8llux devchar %C dev %lud ->\n", c->qid.path, devtab[c->type]->dc, c->dev);
if((wq = devtab[f->to->type]->walk(f->to, nil, names, ntry)) != nil)
break;
}
poperror();
runlock(&mh->lock);
if(wq == nil)
goto Giveup;
type = f->to->type;
dev = f->to->dev;
}
nmh = nil;
if(dotdot) {
assert(wq->nqid == 1);
assert(wq->clone != nil);
if(chandebug) print("undo.");
nc = undomount(wq->clone, cname);
n = 1;
} else {
nc = nil;
if(chandebug) print("find.");
if(!nomount)
for(i=0; i<wq->nqid && i<nnames-1; i++)
if(findmount(&nc, &nmh, type, dev, wq->qid[i]))
break;
if(nc == nil){ /* no mount points along path */
if(wq->clone == nil){
cclose(c);
cnameclose(cname);
free(wq);
if(chandebug) print("fail\n");
return -1;
}
n = wq->nqid;
nc = wq->clone;
}else{ /* stopped early, at a mount point */
if(wq->clone != nil){
cclose(wq->clone);
wq->clone = nil;
}
n = i+1;
}
}
.
524c
type = c->type;
dev = c->dev;
.
521,522c
if(chandebug){
print("\ttry chan: qid %.8llux devchar %C dev %lud ->\n", c->qid.path, devtab[c->type]->dc, c->dev);
for(i=0; i<ntry; i++)
print(" %s", names[i]);
}
if(!dotdot && !nomount)
domount(&c, &mh);
.
512,519c
/*
* While we haven't gotten all the way down the path:
* 1. step through a mount point, if any
* 2. send a walk request for initial dotdot or initial prefix without dotdot
* 3. move to the first mountpoint along the way.
* 4. repeat.
*
* An invariant is that each time through the loop, c is on the undomount
* side of the mount point, and c's name is cname.
*/
while(nnames > 0){
ntry = nnames;
if(ntry > MAXWELEM)
ntry = MAXWELEM;
dotdot = 0;
for(i=0; i<nnames; i++){
if(isdotdot(names[i])){
if(i==0) {
dotdot = 1;
ntry = 1;
} else
ntry = i;
break;
}
}
.
506,510c
if(chandebug){
print("walk");
for(i=0; i<nnames; i++)
print(" %s", names[i]);
print("\n");
}
.
503,504c
c = *cp;
incref(c);
cname = c->name;
incref(cname);
mh = nil;
.
501c
//BUG: waserror?
.
499c
Mhead *mh, *nmh;
Walkqid *wq;
.
497c
int i, dotdot, n, ntry, type, dev;
Chan *c, *nc;
Cname *cname;
.
495c
walk(Chan **cp, char **names, int nnames, int nomount)
.
479,493c
/*
* Either walks all the way or not at all. No partial results.
*/
.
465,466c
nc = t->head->from;
incref(nc);
.
463c
if(strcmp(t->head->from->name->s, name->s) != 0)
.
438c
undomount(Chan *c, Cname *name)
.
436a
int
domount(Chan **cp, Mhead **mp)
{
return findmount(cp, mp, (*cp)->type, (*cp)->dev, (*cp)->qid);
}
.
434c
return 0;
.
428c
return 1;
.
415,426c
if(mp != nil){
incref(m);
if(*mp != nil)
putmhead(*mp);
*mp = m;
}
if(*cp != nil)
cclose(*cp);
incref(m->mount->to);
*cp = m->mount->to;
.
409,413c
if(m->from == nil){
print("m %p m->from 0\n", m);
runlock(&m->lock);
continue;
}
if(eqchantdqid(m->from, type, dev, qid, 1)) {
.
402,407c
for(m = MOUNTH(pg, qid); m; m = m->hash){
.
397d
393,394c
int
findmount(Chan **cp, Mhead **mp, int type, int dev, Qid qid)
.
384,389c
Chan *nc;
Walkqid *wq;
wq = devtab[c->type]->walk(c, nil, nil, 0);
if(wq == nil)
error("clone failed");
nc = wq->clone;
free(wq);
nc->name = c->name;
if(c->name)
incref(c->name);
.
382c
cclone(Chan *c)
.
332c
l = &MOUNTH(pg, mnt->qid);
.
328a
if(mnt->umh) /* should not happen */
print("cmount newp extra umh\n");
if(mounted && mounted->umh)
print("cmount old extra umh\n");
.
303c
nm->mflag |= MCREATE;
.
289c
um = mh->mount;
.
281c
if(mh != nil && mh->mount != nil) {
.
259a
incref(&mheadcounter);
.
254c
if(m == nil) {
.
247c
l = &MOUNTH(pg, old->qid);
.
243a
mh = nil;
domount(newp, &mh);
new = *newp;
/*
* Not allowed to bind when the old directory
* is itself a union. (Maybe it should be allowed, but I don't see
* what the semantics would be.)
*
* We need to check mh->mount->next to tell unions apart from
* simple mount points, so that things like
* mount -c fd /root
* bind -c /root /
* work. The check of mount->mflag catches things like
* mount fd /root
* bind -c /root /
*
* This is far more complicated than it should be, but I don't
* see an easier way at the moment. -rsc
*/
if((flag&MCREATE) && mh && mh->mount
&& (mh->mount->next || !(mh->mount->mflag&MCREATE)))
error(Emount);
.
241c
if((old->qid.type&QTDIR)==0 && order != MREPL)
.
238a
if((*newp)->umh) /* should not happen */
print("cmount newp extra umh\n");
if(old->umh)
print("cmount old extra umh\n");
.
236c
if(QTDIR & (old->qid.type^(*newp)->qid.type))
.
234a
Chan *new;
.
233c
Mhead *m, **l, *mh;
.
230a
if(a->qid.path != qid.path)
return 0;
if(!pathonly && a->qid.vers!=qid.vers)
return 0;
if(a->type != type)
return 0;
if(a->dev != dev)
return 0;
return 1;
}
int
cmount(Chan **newp, Chan *old, int flag, char *spec)
{
.
229c
eqchantdqid(Chan *a, int type, int dev, Qid qid, int pathonly)
.
207a
/*
* Make sure we have the only copy of c. (Copy on write.)
*/
Chan*
cunique(Chan *c)
{
Chan *nc;
if(c->ref != 1) {
nc = cclone(c);
cclose(c);
c = nc;
}
return c;
}
.
179a
if(c->umc != nil){
cclose(c->umc);
c->umc = nil;
}
.
175,178c
if(c->umh != nil){
putmhead(c->umh);
c->umh = nil;
.
171,173c
if(c->version){
free(c->version);
c->version = 0;
.
162a
if(isdotdot(s))
cleancname(n);
.
142a
if(s[0]=='.' && s[1]=='\0')
return n;
.
127c
if(n == nil)
.
101a
c->version = 0;
.
100c
memset(&c->mqid, 0, sizeof(c->mqid));
.
94,95c
c->iounit = 0;
c->umh = 0;
.
84a
if(chandebug) print("newchan %d\n", c->fid);
.
78c
if(c == nil) {
.
49a
kstrcpy(char *s, char *t, int ns)
{
int nt;
nt = strlen(t);
if(nt+1 <= ns){
memmove(s, t, nt+1);
return;
}
/* too long */
if(ns < 4){
/* but very short! */
strncpy(s, t, ns);
return;
}
/* truncate with ... at character boundary (very rare case) */
memmove(s, t, ns-4);
ns -= 4;
s[ns] = '\0';
/* look for first byte of UTF-8 sequence by skipping continuation bytes */
while(ns>0 && (s[--ns]&0xC0)==0x80)
;
strcpy(s+ns, "...");
}
int
emptystr(char *s)
{
if(s == nil)
return 1;
if(s[0] == '\0')
return 1;
return 0;
}
/*
* Atomically replace *p with copy of s
*/
void
kstrdup(char **p, char *s)
{
int n;
char *t, *prev;
static Lock l;
n = strlen(s)+1;
// if(n == 1){
// ulong pc;
// int i;
// static ulong pcs[128];
// pc = getcallerpc(&p);
// for(i=0; i<nelem(pcs) && pcs[i]; i++)
// if(pc == pcs[i])
// break;
// if(up!=nil && i<nelem(pcs) && pcs[i]==0){
// pcs[i] = pc;
// print("kstrdup(null string) called from 0x%lux\n", pc);
// }
// }
/* if it's a user, we can wait for memory; if not, something's very wrong */
if(up){
t = smalloc(n);
setmalloctag(t, getcallerpc(&p));
}else{
t = malloc(n);
if(t == nil)
panic("kstrdup: no memory");
}
memmove(t, s, n);
prev = *p;
*p = t;
free(prev);
}
void
.
48a
/*
* Rather than strncpy, which zeros the rest of the buffer, kstrcpy
* truncates if necessary, always zero terminates, does not zero fill,
* and puts ... at the end of the string if it's too long. Usually used to
* save a string in up->genbuf;
*/
.
24a
isdotdot(char *p)
{
return p[0]=='.' && p[1]=='.' && p[2]=='\0';
}
int
.
20a
typedef struct Elemlist Elemlist;
struct Elemlist
{
char *name; /* copy of name, so '/' can be overwritten */
int nelems;
char **elems;
};
.
7a
int chandebug=0; /* toggled by sysr1 */
/* transition BUG */
int client9p = 2;
int kernel9p = 2;
int domount(Chan**, Mhead**);
Ref mheadcounter;
void
dumpmount(void) /* DEBUGGING */
{
Pgrp *pg;
Mount *t;
Mhead **h, **he, *f;
if(up == nil){
print("no process for dumpmount\n");
return;
}
pg = up->pgrp;
if(pg == nil){
print("no pgrp for dumpmount\n");
return;
}
rlock(&pg->ns);
if(waserror()) {
runlock(&pg->ns);
nexterror();
}
he = &pg->mnthash[MNTHASH];
for(h = pg->mnthash; h < he; h++) {
for(f = *h; f; f = f->hash) {
print("head: %p: %s 0x%llux.%lud %C %lud -> \n", f,
f->from->name->s, f->from->qid.path,
f->from->qid.vers, devtab[f->from->type]->dc,
f->from->dev);
for(t = f->mount; t; t = t->next)
print("\t%p: %s (umh %p)\n", t, t->to->name->s, t->to->umh);
}
}
poperror();
runlock(&pg->ns);
}
.
## diffname port/chan.c 2001/0530
## diff -e /n/emeliedump/2001/0527/sys/src/9/port/chan.c /n/emeliedump/2001/0530/sys/src/9/port/chan.c
806a
if(chandebug) print("undidmount nc %s...", nc->name->s);
.
805c
if(chandebug) print("undo wq->clone->name %s cname %s...", wq->clone->name->s, cname->s);
.
## diffname port/chan.c 2001/0601
## diff -e /n/emeliedump/2001/0530/sys/src/9/port/chan.c /n/emeliedump/2001/0601/sys/src/9/port/chan.c
863c
if(chandebug)
print("[%lud]\twalk succeeds; name %s chan (path %.8llux dev %C %lud)\n", up->pid, c2name(c), c->qid.path, devtab[c->type]->dc, c->dev);
.
845d
840,842d
832a
for(i=0; i<n; i++)
cname = addelem(cname, names[i]);
.
826a
if(chandebug){int j;
qlock(&chanprint);
print("[%lud]\tfound mount point: ", up->pid);
for(j=0; j<=i; j++)
print("%s%s", j?"/":"", names[j]);
print(" becomes ");
print("%s\n", c2name(nc));
qunlock(&chanprint);
}
.
821d
816a
if(chandebug)
print("[%lud]\tno mount points along path\n", up->pid);
.
811d
807c
if(chandebug)
print("[%lud]\tundo returned %s\n", up->pid, c2name(nc));
.
805c
cname = addelem(cname, "..");
if(chandebug)
print("[%lud]\tundo wq->clone %s cname %s\n", up->pid, c2name(wq->clone), cname?cname->s:"<nil name>");
.
787c
if(chandebug)
print("[%lud]\twalk from %s (path %.8llux dev %C %lud)\n",
up->pid, c2name(c), c->qid.path, devtab[c->type]->dc, c->dev);
.
773,774c
if(chandebug) print("[%lud]\tgive up\n", up->pid);
.
769c
if(chandebug) print("[%lud]\twalk failed.\n", up->pid);
.
760c
print("%s%s", i?"/":"", names[i]);
print("\n");
qunlock(&chanprint);
.
758c
qlock(&chanprint);
print("[%lud]\twalk from %s (path %.8llux dev %C %lud) to ",
up->pid, c2name(c), c->qid.path, devtab[c->type]->dc, c->dev);
.
728a
qunlock(&chanprint);
.
727c
print("%s%s", i?"/":"", names[i]);
.
725c
qlock(&chanprint);
print("[%lud] walk %s to ", up->pid, c2name(c));
.
692a
if(chandebug)
print("[%lud]\tundomount found %s\n", up->pid, c2name(c));
.
678a
if(strcmp(f->from->name->s, name->s) != 0)
continue;
if(chandebug)
print("[%lud]\tundomount found head %s; need chan (path %.8llux dev %C %lud)\n",
up->pid, name->s, c->qid.path, devtab[c->type]->dc, c->dev);
.
228d
54a
char*
c2name(Chan *c) /* DEBUGGING */
{
if(c == nil)
return "<nil chan>";
if(c->name == nil)
return "<nil name>";
if(c->name->s == nil)
return "<nil name.s>";
return c->name->s;
}
.
48c
print("\t%p: %s (umh %p) (path %.8llux dev %C %lud)\n", t, t->to->name->s, t->to->umh, t->to->qid.path, devtab[t->to->type]->dc, t->to->dev);
.
14d
8a
QLock chanprint; /* probably asking for trouble (deadlocks) -rsc */
.
## diffname port/chan.c 2001/0803
## diff -e /n/emeliedump/2001/0601/sys/src/9/port/chan.c /n/emeliedump/2001/0803/sys/src/9/port/chan.c
559c
print("cunmount old extra umh\n");
.
557c
print("cunmount newp extra umh\n");
.
## diffname port/chan.c 2001/0819
## diff -e /n/emeliedump/2001/0803/sys/src/9/port/chan.c /n/emeliedump/2001/0819/sys/src/9/port/chan.c
900,901d
894a
if(c->umh != nil){ //BUG
print("walk umh\n");
putmhead(c->umh);
c->umh = nil;
}
.
889,893d
875d
857,865d
846,847d
836,837d
833,834d
816d
810,813d
798d
794d
778,786d
743,751d
735,736d
710,711d
693,695d
358a
.
344a
if(c->mux != nil){
muxclose(c->mux);
c->mux = nil;
}
if(c->mchan != nil){
cclose(c->mchan);
c->mchan = nil;
}
.
333,336d
258d
255a
c->mux = 0;
.
177,189d
## diffname port/chan.c 2001/0822
## diff -e /n/emeliedump/2001/0819/sys/src/9/port/chan.c /n/emeliedump/2001/0822/sys/src/9/port/chan.c
1244a
.
1226c
error(createerr); /* report true error */
.
1224a
/* save error */
kstrcpy(createerr, up->error, sizeof createerr);
.
1108,1111c
if(omode & OCEXEC)
c->flag |= CCEXEC;
if(omode & ORCLOSE)
c->flag |= CRCLOSE;
break;
}
.
1106c
c = devtab[c->type]->open(c, omode&~OCEXEC);
.
1103,1104c
if(omode == OEXEC)
c->flag &= ~CCACHE;
.
1100,1101c
/* save registers else error() in open has wrong value of c saved */
saveregisters();
.
1098c
if(c->qid.type&QTDIR)
c->umh = m;
else
putmhead(m);
.
1093a
case Aopen:
case Acreate:
.
1092d
1089c
switch(amode){
case Aremove:
.
971a
char createerr[ERRMAX];
.
774c
for(f = mh->mount->next; f; f = f->next)
.
551c
print("cunmount old extra umh %p has %p\n", mounted, mounted->umh);
.
549c
print("cunmount newp extra umh %p has %p\n", mnt, mnt->umh);
.
239a
c->dri = 0;
.
## diffname port/chan.c 2001/0823
## diff -e /n/emeliedump/2001/0822/sys/src/9/port/chan.c /n/emeliedump/2001/0823/sys/src/9/port/chan.c
1102c
/* only save the mount head if it's a multiple element union */
if(m && m->mount && m->mount->next)
.
## diffname port/chan.c 2001/0912
## diff -e /n/emeliedump/2001/0823/sys/src/9/port/chan.c /n/emeliedump/2001/0912/sys/src/9/port/chan.c
549,552c
if(mnt->umh) /* should not happen */
print("cunmount newp extra umh %p has %p\n", mnt, mnt->umh);
/*
* It _can_ happen that mounted->umh is non-nil,
* because mounted is the result of namec(Aopen)
* (see sysfile.c:/^sysunmount).
* If we open a union directory, it will have a umh.
* Although surprising, this is okay, since the
* cclose will take care of freeing the umh.
*/
.
## diffname port/chan.c 2001/0919
## diff -e /n/emeliedump/2001/0912/sys/src/9/port/chan.c /n/emeliedump/2001/0919/sys/src/9/port/chan.c
1078a
break;
case Abind:
m = nil;
if(!nomount)
domount(&c, &m);
c->umh = m;
.
441a
mh = new->umh;
.
439,440d
429,430d
## diffname port/chan.c 2001/0922
## diff -e /n/emeliedump/2001/0919/sys/src/9/port/chan.c /n/emeliedump/2001/0922/sys/src/9/port/chan.c
1239a
c->name = addelem(c->name, e.elems[e.nelems-1]);
.
## diffname port/chan.c 2001/0924
## diff -e /n/emeliedump/2001/0922/sys/src/9/port/chan.c /n/emeliedump/2001/0924/sys/src/9/port/chan.c
1251a
}
up->errstr = createerr;
.
1249,1250c
createerr = up->errstr;
up->errstr = tmperrbuf;
/* note: we depend that walk does not error */
if(walk(&c, e.elems+e.nelems-1, 1, nomount) < 0){
up->errstr = createerr;
.
1046c
snprint(up->errstr, ERRMAX, "file \"...%s\" does not exist", name);
.
1044c
snprint(up->errstr, ERRMAX, "\"%s\" does not exist", aname);
.
1042c
if(strcmp(up->errstr, Enonexist) == 0){
.
977c
char *createerr, tmperrbuf[ERRMAX];
.
778a
/*
* mh->mount == c, so start at mh->mount->next
*/
.
## diffname port/chan.c 2001/0926
## diff -e /n/emeliedump/2001/0924/sys/src/9/port/chan.c /n/emeliedump/2001/0926/sys/src/9/port/chan.c
356c
// print("cclose error: type %C; error %s\n", devtab[c->type]->dc, up!=nil? up->errstr : "no user");
.
## diffname port/chan.c 2001/1118
## diff -e /n/emeliedump/2001/0926/sys/src/9/port/chan.c /n/emeliedump/2001/1118/sys/src/9/port/chan.c
1167d
1164,1165c
if(omode&OEXCL)
.
## diffname port/chan.c 2001/1130
## diff -e /n/emeliedump/2001/1118/sys/src/9/port/chan.c /n/emeliedump/2001/1130/sys/src/9/port/chan.c
356,357c
print("cclose error: type %C; error %s\n", devtab[c->type]->dc, up!=nil? up->errstr : "no user");
/* don't chanfree: better leak than leave a dangling pointer */
.
## diffname port/chan.c 2001/1204
## diff -e /n/emeliedump/2001/1130/sys/src/9/port/chan.c /n/emeliedump/2001/1204/sys/src/9/port/chan.c
360,362d
355,358c
if(!waserror()){
devtab[c->type]->close(c);
poperror();
.
## diffname port/chan.c 2001/1213
## diff -e /n/emeliedump/2001/1204/sys/src/9/port/chan.c /n/emeliedump/2001/1213/sys/src/9/port/chan.c
802c
for(i=0; i<wq->nqid && i<ntry-1; i++)
.
## diffname port/chan.c 2002/0104
## diff -e /n/emeliedump/2001/1213/sys/src/9/port/chan.c /n/emeliedump/2002/0104/sys/src/9/port/chan.c
1271a
free(e.off);
.
1249c
if(walk(&c, e.elems+e.nelems-1, 1, nomount, nil) < 0){
.
1159c
if(walk(&c, e.elems+e.nelems-1, 1, nomount, nil) == 0){
.
1068,1069c
if(walk(&c, e.elems, e.nelems, nomount, &npath) < 0){
if(npath < 0 || npath > e.nelems){
print("namec %s walk error npath=%d\n", aname, npath);
nexterror();
}
len = prefix+e.off[npath];
strcpy(tmperrbuf, up->errstr);
if(len < ERRMAX/3 || (name=memrchr(aname, '/', len))==nil || name==aname)
snprint(up->errstr, ERRMAX, "\"%.*s\" %s", len, aname, tmperrbuf);
else
snprint(up->errstr, ERRMAX, "\"...%.*s\" %s", (int)(len-(name-aname)), name, tmperrbuf);
nexterror();
}
.
1049a
free(e.off);
.
1041,1046d
1039a
e.off = nil;
e.nelems = 0;
.
1036a
prefix = name - aname;
.
970c
int n, prefix, len, t, nomount, npath;
.
950a
void*
memrchr(void *va, int c, long n)
{
uchar *a, *e;
a = va;
for(e=a+n-1; e>a; e--)
if(*e == c)
return e;
return nil;
}
.
945a
}
e->off[e->nelems] = slash - e->name;
.
944c
if(slash == nil){
e->off[e->nelems] = name+strlen(name) - e->name;
.
941a
.
936a
e->off = smalloc(sizeof(int));
e->off[0] = 0;
.
919a
inew = smalloc((e->nelems+Delta+1) * sizeof(int));
memmove(inew, e->off, e->nelems*sizeof(int));
free(e->off);
e->off = inew;
.
912a
int *inew;
.
848a
if(nerror)
*nerror = 0;
.
828,830d
822c
cname = addelem(cname, names[nhave+i]);
.
808a
if(wq->nqid==0 || (wq->qid[wq->nqid-1].type&QTDIR)){
if(nerror)
*nerror = nhave+wq->nqid+1;
strcpy(up->errstr, Edoesnotexist);
}else{
if(nerror)
*nerror = nhave+wq->nqid;
strcpy(up->errstr, Enotdir);
}
.
769,788d
766a
if(nerror)
*nerror = nhave+1;
.
763,764c
if(mh && !nomount){
/*
* mh->mount == c, so start at mh->mount->next
*/
rlock(&mh->lock);
for(f = mh->mount->next; f; f = f->next)
if((wq = devtab[f->to->type]->walk(f->to, nil, names+nhave, ntry)) != nil)
break;
runlock(&mh->lock);
if(f != nil){
type = f->to->type;
dev = f->to->dev;
}
}
if(wq == nil){
.
761c
if((wq = devtab[type]->walk(c, nil, names+nhave, ntry)) == nil){
.
744,745c
for(i=0; i<ntry; i++){
if(isdotdot(names[nhave+i])){
.
739,740c
for(nhave=0; nhave<nnames; nhave+=n){
if((c->qid.type&QTDIR)==0){
if(nerror)
*nerror = nhave;
cnameclose(cname);
cclose(c);
strcpy(up->errstr, Enotdir);
return -1;
}
ntry = nnames - nhave;
.
716c
int dev, dotdot, i, n, nhave, ntry, type;
.
714c
walk(Chan **cp, char **names, int nnames, int nomount, int *nerror)
.
712a
static char Edoesnotexist[] = "does not exist";
.
711c
* Either walks all the way or not at all. No partial results in *cp.
* *nerror is the number of names to display in an error message.
.
87a
int *off;
.
## diffname port/chan.c 2002/0109
## diff -e /n/emeliedump/2002/0104/sys/src/9/port/chan.c /n/emeliedump/2002/0109/sys/src/9/port/chan.c
210a
void
chandevshutdown(void)
{
int i;
/* shutdown in reverse order */
for(i=0; devtab[i] != nil; i++)
;
for(i--; i >= 0; i--)
devtab[i]->shutdown();
}
.
## diffname port/chan.c 2002/0115
## diff -e /n/emeliedump/2002/0109/sys/src/9/port/chan.c /n/emeliedump/2002/0115/sys/src/9/port/chan.c
11,14d
## diffname port/chan.c 2002/0411
## diff -e /n/emeliedump/2002/0115/sys/src/9/port/chan.c /n/emeliedump/2002/0411/sys/src/9/port/chan.c
1432d
1394,1395c
if(!slashok || c!='/'){
snprint(up->genbuf, sizeof(up->genbuf), "%s: %q", Ebadchar, aname);
error(up->genbuf);
}
.
1373a
name = aname;
.
1369c
char *p, *ename, *name;
.
1367c
validname(char *aname, int slashok)
.
481d
12d
## diffname port/chan.c 2002/0416
## diff -e /n/emeliedump/2002/0411/sys/src/9/port/chan.c /n/emeliedump/2002/0416/sys/src/9/port/chan.c
1119c
snprint(up->genbuf, sizeof up->genbuf, "...%.*s", (int)(len-(name-aname)), name);
snprint(up->errstr, ERRMAX, "%#q %s", up->genbuf, tmperrbuf);
.
1117c
snprint(up->genbuf, sizeof up->genbuf, "%.*s", len, aname);
.
## diffname port/chan.c 2002/0731
## diff -e /n/emeliedump/2002/0416/sys/src/9/port/chan.c /n/emeliedump/2002/0731/sys/src/9/port/chan.c
1163a
c->umh = nil;
.
1162c
print("cunique umh Open\n");
.
1133a
if(c->umh != nil)
putmhead(c->umh);
.
609a
wunlock(&pg->ns);
.
604a
wunlock(&pg->ns);
.
600a
wunlock(&pg->ns);
.
587d
479,483c
m = newmhead(old);
.
433,434c
if(old->umh)print("cmount old extra umh\n");
.
420a
Mhead*
newmhead(Chan *from)
{
Mhead *mh;
int n;
mh = smalloc(sizeof(Mhead));
mh->ref = 1;
mh->from = from;
incref(from);
n = from->name->len;
if(n >= sizeof(mh->fromname))
n = sizeof(mh->fromname)-1;
memmove(mh->fromname, from->name->s, n);
mh->fromname[n] = 0;
return mh;
}
.
## diffname port/chan.c 2002/0801
## diff -e /n/emeliedump/2002/0731/sys/src/9/port/chan.c /n/emeliedump/2002/0801/sys/src/9/port/chan.c
847a
if(mh != nil)
putmhead(mh);
.
815a
if(mh != nil)
putmhead(mh);
.
771a
if(mh != nil)
{print("walk 1\n");
putmhead(mh);
}
.
## diffname port/chan.c 2002/0830
## diff -e /n/emeliedump/2002/0801/sys/src/9/port/chan.c /n/emeliedump/2002/0830/sys/src/9/port/chan.c
115c
panic("decref, pc=0x%lux", getcallerpc(&r));
.
## diffname port/chan.c 2002/0911
## diff -e /n/emeliedump/2002/0830/sys/src/9/port/chan.c /n/emeliedump/2002/0911/sys/src/9/port/chan.c
437c
*/
.
431a
/*
.
425d
## diffname port/chan.c 2003/0303
## diff -e /n/emeliedump/2002/0911/sys/src/9/port/chan.c /n/emeliedump/2003/0303/sys/src/9/port/chan.c
1367,1370d
1364,1365c
while(name[0]=='/' || (name[0]=='.' && (name[1]==0 || name[1]=='/')))
.
1359c
* name is valid. skip leading / and ./ as much as possible
.
1148a
if(e.mustbedir && !(c->qid.type&QTDIR)){
npath = e.nelems;
strcpy(tmperrbuf, "not a directory");
goto NameError;
}
if(amode == Aopen && (omode&3) == OEXEC && (c->qid.type&QTDIR)){
npath = e.nelems;
error("cannot exec directory");
}
.
1140a
NameError:
len = prefix+e.off[npath];
.
1139d
1130c
error(Eexist);
.
1128a
/* perm must have DMDIR if last element is / or /. */
if(e.mustbedir && !(perm&DMDIR)){
npath = e.nelems;
strcpy(tmperrbuf, "create without DMDIR");
goto NameError;
}
/* don't try to walk the last path element just yet. */
.
1126c
* On create, ....
.
1102d
1062d
998a
e->mustbedir = 0;
.
994d
992a
}
.
991c
if(*name=='\0'){
e->mustbedir = 1;
.
988c
e->off[0] = skipslash(name) - name;
.
976a
* A path ending in / or /. or /.//./ etc. will have
* e.mustbedir = 1, so that we correctly
* reject, e.g., "/adm/users/." when /adm/users is a file
* rather than a directory.
.
83a
int mustbedir;
.
## diffname port/chan.c 2003/0509
## diff -e /n/emeliedump/2003/0303/sys/src/9/port/chan.c /n/emeliedump/2003/0509/sys/src/9/port/chan.c
1218d
1206a
case Aaccess:
.
1205a
/* record whether c is on a mount point */
c->ismtpt = m!=nil;
.
1188a
case Aaccess:
.
1175,1179d
1165,1166c
nameerror(aname, "not a directory");
.
1152,1160c
nameerror(aname, up->errstr);
.
1137,1138c
nameerror(aname, "create without DMDIR");
.
1110d
1045c
int n, t, nomount, npath;
.
1037,1040c
* Under certain circumstances, opening Aaccess will cause
* an unnecessary clone in order to get a cunique Chan so it
* can attach the correct name. Sysstat and sys_stat need the
* correct name so they can rewrite the stat info.
.
1035c
* Opening Atodir or Amount does not guarantee this.
.
1030c
* Opening with amode Aopen, Acreate, Aremove, or Aaccess guarantees
.
1025a
void
nameerror(char *name, char *error)
{
int len;
char tmperr[ERRMAX], *p;
strcpy(tmperr, error); /* error might be in genbuf or tmperr */
len = strlen(name);
if(len < ERRMAX/3 || (p=strrchr(name, '/'))==nil || p==name)
snprint(up->genbuf, sizeof up->genbuf, "%s", name);
else
snprint(up->genbuf, sizeof up->genbuf, "...%s", p);
snprint(up->errstr, ERRMAX, "%#q %s", up->genbuf, tmperr);
nexterror();
}
.
835c
}else{
.
828c
if(dotdot){
.
804c
* mh->mount->to == c, so start at mh->mount->next
.
776d
774d
658,663c
if(m->from == nil){
print("m %p m->from 0\n", m);
runlock(&m->lock);
continue;
}
if(eqchantdqid(m->from, type, dev, qid, 1)){
.
329a
if(c->dirrock != nil){
free(c->dirrock);
c->dirrock = 0;
c->nrock = 0;
c->mrock = 0;
}
.
255a
c->ismtpt = 0;
.
245a
c->devoffset = 0;
.
52c
channame(Chan *c) /* DEBUGGING */
.
|
