unbufcall.9

7号信令功能代码,为开源代码

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.TH UNBUFCALL 9 "2004/01/12 23:33:12" "LiS-2_16_18-8" "Linux STREAMS DDI/DKI"
.SH NAME
.B unbufcall, lis_unbufcall
\- removes a \fISTREAMS\fR buffer callback
.SH SYNOPSIS
.PP
.B #include <sys/stream.h>
.HP 8
.BI "unbufcall(int " bcid );
.SH DESCRIPTION
.PP
.BR unbufcall ()
cancels the buffer callback that was installed using
.BR bufcall "(9) or " esbbcall (9).
.I bcid
is the buffer callback identifier that was returned from a previous call to
.BR bufcall "(9) or " esbbcall (9).
.PP
.BR unbufcall ()
is typically used to remove outstanding buffer calls when a stream is closing.
.SH "RETURN VALUES"
.PP
.BR unbufcall ()
returns
.BR void .
.SH ERRORS
.PP
.BR bufcall ()
silently fails if the buffer callback identified by
.I bcid
no longer exists;
or, 
.I bcid
is invalid.
.SH CAVEATS
.PP
.B LiS
.[
LiS
.]
uses rather inefficient linear lookups with interrupts disabled while looking
for the
.I bcid
in the list of buffer callbacks.  As buffer callbacks should be rare in most
.IR STREAMS (4)
module and driver designs, this is of little moment.
.SH "SEE ALSO"
.PP
.BR bufcall (9),
.BR esbbcall (9).
.SH VERSIONS
.PP
This manpage was written for
.B LiS\c
.
.[
LiS
.]
.PP
.BR unbufcall ()
first appeared in SVR 3.
.[
svr3
.]
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svr4
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