putnext.9

7号信令功能代码,为开源代码

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.TH PUTNEXT 9 "2004/01/12 23:33:09" "LiS-2_16_18-8" "Linux STREAMS DDI/DKI"
.SH NAME
.B putnext, lis_putnext
\- puts a message on the downstream \fISTREAMS\fR message queue
.SH SYNOPSIS
.PP
.B #include <sys/stream.h>
.HP 8
.BI "putnext(queue_t *" q ", mblk_t *" mp );
.SH DESCRIPTION
.PP
.BR putnext ()
invokes the put procedure of the queue
.I q->q_next
with the message pointed to by
.IR mp.
.PP
.BR putnext ()
is normally invoked from within the put or service procedure belonging to
queue
.IR q .
.PP
It is the responsibility of a procedure calling
.BR putnext ()
with a low priority message pointed to by
.I mp
to first call
.BR canputnext (9)
for the queue to check for flow control.
If
.BR canputnext (9)
fails for queue
.IR q ,
the procedure should not normally invoke
.BR putnext ()
with a low priority message for the flow controlled queue
.IR q->q_next .
.SH "RETURN VALUES"
.PP
.BR putnext ()
returns void.
.SH ERRORS
.PP
.BR putnext ()
fails silently and frees the message pointed to by
.I mp
when the following occurs:
the message pointer
.I mp
is
.BR NULL ;
the queue pointer
.I q
is
.BR NULL ;
the structure pointed to by
.I q
is not a queue structure;
the pointer
.I q->q_next
is
.BR NULL .
.SH CAVEATS
.PP
The
.B LiS
.[
LiS
.]
implementation of
.BR putnext ()
also fails silently if
.I q->q_next
has a
.I q_info
pointer of
.BR NULL ;
the queue pointed to by
.I q->q_next
has no put procedure; or the
queue pointed to by
.I q->q_next
is closing, or the queue has had put and service routine processing turned off
(e.g. with
.BR qprocsoff (9)).
.SH "SEE ALSO"
.PP
.BR putq (9),
.BR canputnext (9).
.SH VERSIONS
.PP
This manpage was written for
.B LiS\c
.
.[
LiS
.]
.PP
.BR putnext ()
first appeared in SVR 3.
.[
svr3
.]
In SVR 3,
.[
svr3
.]
4 and 4.2,
.BR putnext ()
returned
.BR int .
C compilers at the time did not support
.B void
as a return value, and the value returned by
.BR putnext ()
was ignored.
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