freeb.9

7号信令功能代码,为开源代码

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.TH FREEB 9 "2004/01/12 23:33:00" "LiS-2_16_18-8" "Linux STREAMS DDI/DKI"
.SH NAME
.B freeb
\- frees a \fISTREAMS\fR message block
.SH SYNOPSIS
.PP
.B #include <sys/stream.h>
.HP 8
.BI "freeb(struct msgb *" bp );
.SH DESCRIPTION
.PP
.BR freeb ()
frees the message block pointed to by
.I bp
and the associated data block and data buffer.
.PP
Freeing a message block might or might not result in the deallocation of the
message block, data block or data buffer, depending upon the internal
implementation, the binding of message blocks to data blocks and whether the
buffer is an internal or external buffer.
.PP
For external data buffers that are to be freed, the
.I function
will be called with the
.I arg
provided previously to the
.BR esballoc (9)
call.
.SH "RETURN VALUES"
.PP
.BR freeb ()
returns void.
.SH ERRORS
.PP
If the block pointer,
.IR bp ,
passed to
.BR freeb ()
is
.BR NULL ,
then
.BR freeb ()
will silently fail.
.SH CAVEATS
.PP
.BR freemsg (9)
is implemented with a looping call to
.BR freeb ().
.PP
.B LiS
.[
LiS
.]
uses a complicated message block and data block binding scheme with embedded
data buffers
.B FASTBUF
or less in size.  Determining the point at which a buffer is actually freed is
rather complicated.
.SH "SEE ALSO"
.PP
.BR allocb (9),
.BR esballoc "(9), and "
.BR freemsg (9).
.SH VERSIONS
.PP
This manpage was written for
.B LiS\c
.
.[
LiS
.]
.PP
.BR freeb ()
appeared first in SVR 3.
.[
svr3
.]
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.[
svr4
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.TA