rmvb.9

7号信令功能代码,为开源代码

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.\" @(#) rmvb.9,v 1.1.4.1 2004/01/12 23:33:11 brian Exp
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.TH RMVB 9 "2004/01/12 23:33:11" "LiS-2_16_18-8" "Linux STREAMS DDI/DKI"
.SH NAME
.B rmvb, lis_rmvb
\- remove a message block from a \fISTREAMS\fR message
.SH SYNOPSIS
.PP
.B #include <sys/stream.h>
.HP 8
.BI "mblk_t *" msg " = rmvb(mblk_t *" mp ", mblk_t *" bp );
.SH DESCRIPTION
.PP
Removes the message block pointed to by
.I bp
from the message pointed to by
.I mp
and returns the pointer to the (new) first message block in the message,
.IR msg .
.PP
.BR rmvb ()
does removes the message block
.I bp
from the message
.IR mp ,
but does not free the message block
.IR bp .
.IR bp 's
.I b_cont
pointer is set to
.BR NULL .
.SH "RETURN VALUES"
.PP
Upon success,
.BR rmvb ()
returns a pointer to the modified message
.IR msg .
The modified message
.I msg
may be
.BR NULL .
.PP
Upon failure,
.BR rmvb ()
returns
.BR "(mblk_t *)(-1)" .
.SH ERRORS
.PP
When
.BR rmvb ()
fails it returns
.BR "(mblk_t *)(-1)" .
.BR rmvb ()
only fails if
.I bp
was not in the message.
.SH CAVEATS
.PP
.BR rmvb ()
returns
.B NULL
if
.IR mp " or " bp
are
.BR NULL .
This is not entirely correct, as when
.I mp
is
.B NULL
and
.I bp
is not,
.I bp
does not exist in the message pointed to by
.IR mp ,
and 
.BR rmvb ()
should return
.BR (mblk_t *)(-1).
.SH "SEE ALSO"
.PP
.BR linkb (9),
.BR unlinkb (9),
.BR freeb (9).
.SH VERSIONS
.PP
This manpage was written for
.B LiS\c
.
.[
LiS
.]
.PP
.BR rmvb ()
first appeared in SVR 3.
.[
svr3
.]
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svr4
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