qreply.9

7号信令功能代码,为开源代码

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.TH QREPLY 9 "2004/01/12 23:33:11" "LiS-2_16_18-8" "Linux STREAMS DDI/DKI"
.SH NAME
.B qreply, lis_qreply
\- replys to a message from a \fISTREAMS\fR message queue
.SH SYNOPSIS
.PP
.B #include <sys/stream.h>
.HP 8
.BI "qreply(queue_t *" q ", mblk_t *" mp );
.SH DESCRIPTION
.PP
.BR qreply ()
replies, with the message pointed to by
.IR mp ,
to the read queue that is upstream from the specified write queue
pointed to by
.IR q ,
or the write queue downstream from the specified read queue pointed to by
.IR q .
.PP
.BR qreply ()
is normally used within
.IR q 's
put or service procedures to reply to messages that have arrived on its write
queue from upstream, or its read queue from downstream.
.SH "RETURN VALUES"
.PP
.BR qreply ()
returns
.BR void .
.SH ERRORS
.PP
.BR qreply ()
silently fails if
silently fails and frees the passed in message if
the message pointer
.I mp
is
.BR NULL .
.BR qreply ()
silently fails and frees the passed in message if
the queue pointer
.I q
is
.BR NULL ,
or
.BI OTHERQ( q )
is
.BR NULL ;
.BI OTHERQ( q )
does not refer to a queue structure;
.BI OTHERQ( q ) ->q_next
is
.BR NULL ;
.BI OTHERQ( q ) ->q_next
does not refer to a queue structure;
.BI OTHERQ( q ) ->q_next->q_info
is
.BR NULL ,
or
.BI OTHERQ( q ) ->q_next
does not have a put procedure;
.BI OTHERQ( q ) ->q_next
has put and service procedures turned off (e.g. with
.BR qprocsoff (9)).
.SH CAVEATS
.PP
\fB\)qreply(\fI\)q\fB\), \fI\)mp\fB\))\fR\)
has the same effect as
\fB\)putnext(OTHERQ(\fI\)q\fB\))\fI\)->q_next\fB\), \fI\)mp\fB\))\fR\).
.PP
Because
.BR qreply ()
invokes the put procedure of the upstream or downstream queue, the same care
should be taken with
.BR qreply ()
as is taken with
.BR putnext (9).
.SH "SEE ALSO"
.PP
.BR OTHERQ (9),
.BR putnext (9),
.BR putq (9).
.SH VERSIONS
.PP
This manpage was written for
.B LiS\c
.
.[
LiS
.]
.PP
.BR qreply ()
first appeared in SVR 3.
.[
svr3
.]
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