opensolaris man page for msgsize

msgsize(9F)						   Kernel Functions for Drivers 					       msgsize(9F)

NAME
       msgsize - Return the total number of bytes in a message

SYNOPSIS
       #include <sys/stream.h>
       #include <sys/strsun.h>

       size_t msgsize(mblk_t *mp);

INTERFACE LEVEL
       Solaris DDI specific (Solaris DDI)

PARAMETERS
       mp    Message to be evaluated.

DESCRIPTION
       The msgsize() function counts the number of bytes in a message, regardless of the data type of the underlying data blocks.

RETURN VALUES
       Number of bytes in the message.

CONTEXT
       This function can be called from user, kernel or interrupt context.

SEE ALSO
       msgdsize(9F)

       STREAMS Programming Guide

SunOS 5.11							    9 June 2004 						       msgsize(9F)