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.TH XtAppAddBlockHook __libmansuffix__ __xorgversion__ "XT FUNCTIONS"
.SH NAME
XtAppAddBlockHook, XtRemoveBlockHook \- register a block hook procedure
.SH SYNTAX
.HP
XtBlockHookId XtAppAddBlockHook(XtAppContext \fIapp_context\fP,
XtBlockHookProc \fIproc\fP, XtPointer \fIclient_data\fP); 
.HP
void XtRemoveBlockHook(XtBlockHookId \fIid\fP); 
.SH ARGUMENTS
.IP \fIapp_context\fP 1i
Specifies the application context.
.IP \fIproc\fP 1i
Specifies the block hook procedure.
.IP \fInum_args\fP 1i
Specifies the application-specific data to be passed to the block hook.
.SH DESCRIPTION
.ZN XtAppAddBlockHook
registers the specified procedure and returns an identifier for it.
The hook is called at any time in the future when the Intrinsics are
about to block pending some input.
.LP
Block hook procedures are removed automatically and the
.ZN XtBlockHookId
is destroyed when the application context in which they were added is
destroyed.
.LP
.ZN XtRemoveBlockHook
removes the specified block hook procedure from the list in which it
was registered.
.SH "SEE ALSO"
.br
\fI\*(xT\fP
.br
\fI\*(xL\fP

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