qenable.9

7号信令功能代码,为开源代码

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.\" @(#) qenable.9,v 1.1.4.1 2004/01/12 23:33:10 brian Exp
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.TH QENABLE 9 "2004/01/12 23:33:10" "LiS-2_16_18-8" "Linux STREAMS DDI/DKI"
.SH NAME
.B qenable, lis_qenable
\- schedules a \fISTREAMS\fR message queue service routine
.SH SYNOPSIS
.PP
.B #include <sys/stream.h>
.HP 8
.BI "qenable(queue_t *" q );
.SH DESCRIPTION
.PP
.BR qenable ()
schedules the service procedure of the queue pointed to by
.I q
to be run by
.BR runqueues () .
If the queue pointed to by
.I q
has been disabled with a call to
.BR noenable (9),
then
.BR qenable ()
will silently fail.
Whether the queue can be scheduled with
.BR qenable ()
can be determined with a call to
.BR canenable (9).
.PP
.BR qenable ()
is normally called to indirectly invoke the execution of
.IR q 's
service procedure.
.SH "RETURN VALUES"
.PP
.BR qenable ()
returns
.BR void .
.SH ERRORS
.PP
.BR qenable ()
fails silently if
the queue pointer
.I q
is
.BR NULL ;
the queue pointed to by
.I q
has a
.I q_info
pointer of
.BR NULL ;
.I q
has no service procedure;
.I q
is closing;
or,
.I q
has had put and service routine processing turned off
(e.g. with
.BR qprocsoff (9));
or,
.I q
has been disabled with a call to
.BR noenable (9).
.SH CAVEATS
.PP
.SH "SEE ALSO"
.PP
.BR canenable (9),
.BR noenable (9),
.BR enableok (9).
.SH VERSIONS
.PP
This manpage is for
.B LiS\c
.
.[
LiS
.]
.PP
.BR qenable ()
first appeared in SVR 4.
.[
svr4
.]
The original versions of
.BR qenable ()
returned
.B int
instead of
.BR void .
.\"
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.XX
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.[
svr42
.]
.[
svr4
.]
.\"
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