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document behavior of M_{LEADING,TRAILING}SPACE when mbuf data portion is shared.

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(NOTE: this is a netbsd-only behavior)
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itojun 2001-07-28 16:19:12 +00:00
parent 6bc3e72dcd
commit 5145bbe967
1 changed files with 5 additions and 1 deletions
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6
share/man/man9/mbuf.9
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@ -1,4 +1,4 @@
.\" $NetBSD: mbuf.9,v 1.15 2001/06/28 23:15:24 itojun Exp $
.\" $NetBSD: mbuf.9,v 1.16 2001/07/28 16:19:12 itojun Exp $
.\"
.\" Copyright (c) 1997 The NetBSD Foundation, Inc.
.\" All rights reserved.
@ -566,11 +566,15 @@ Implemented as a macro.
Returns the amount of space available before the current start of valid
data in mbuf
.Fa m .
Returns 0 if the mbuf data part is shared across multiple mbufs
.Pq i.e. not writable .
Implemented as a macro.
.It Fn M_TRAILINGSPACE "struct mbuf *m"
Returns the amount of space available after the current end of valid
data in mbuf
.Fa m .
Returns 0 if the mbuf data part is shared across multiple mbufs
.Pq i.e. not writable .
Implemented as a macro.
.It Fn M_PREPEND "struct mbuf *m" "int plen" "int how"
Prepends space of size