cvs -q diff -au mbuf.9
Index: mbuf.9
===================================================================
RCS file: /cvsroot/src/share/man/man9/mbuf.9,v
retrieving revision 1.50
diff -a -u -r1.50 mbuf.9
--- mbuf.9	2 Dec 2010 12:54:13 -0000	1.50
+++ mbuf.9	14 Jun 2013 09:37:04 -0000
@@ -47,6 +47,7 @@
 .Nm m_prepend ,
 .Nm m_pulldown ,
 .Nm m_pullup ,
+.Nm m_copyup ,
 .Nm m_split ,
 .Nm m_adj ,
 .Nm m_apply ,
@@ -101,6 +102,8 @@
 .Ft struct mbuf *
 .Fn m_pullup "struct mbuf *n" "int len"
 .Ft struct mbuf *
+.Fn m_copyup "struct mbuf *m" "int len" "int dstoff"
+.Ft struct mbuf *
 .Fn m_split "struct mbuf *m0" "int len0" "int wait"
 .Ft void
 .Fn m_adj "struct mbuf *mp" "int req_len"
@@ -485,6 +488,26 @@
 .Fa len
 must be smaller or equal than
 .Dv MHLEN .
+.It Fn m_copyup "struct mbuf *m" "int len" "int dstoff"
+Similar to
+.Fn m_pullup
+but copies
+.Fa len
+bytes of data into a new mbuf at
+.Fa dstoff
+bytes into the mbuf.
+The
+.Fa dstoff
+argument aligns the data and leaves room for a link layer header.
+Returns the new
+mbuf chain on success, and frees the mbuf chain and returns
+.Dv NULL
+on failure.
+Note that
+the function does not allocate mbuf clusters, so
+.Fa len + dstoff
+must be less than
+.Dv MHLEN .
 .It Fn m_split "struct mbuf *m0" "int len0" "int wait"
 Partitions an mbuf chain in two pieces, returning the tail,
 which is all but the first