opensolaris man page for msgdsize

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

NAME
       msgdsize - return the number of bytes in a message

SYNOPSIS
       #include <sys/stream.h>

       size_t msgdsize(mblk_t *mp);

INTERFACE LEVEL
       Architecture independent level 1 (DDI/DKI).

PARAMETERS
       mp    Message to be evaluated.

DESCRIPTION
       The msgdsize() function counts the number of bytes in a data message. Only bytes included in the data blocks of type M_DATA are included in
       the count.

RETURN VALUES
       The number of data bytes in a message, expressed as an integer.

CONTEXT
       The msgdsize() function can be called from user, interrupt, or kernel context.

EXAMPLES
       See bufcall(9F) for an example that uses msgdsize().

SEE ALSO
       bufcall(9F)

       Writing Device Drivers

       STREAMS Programming Guide

SunOS 5.11							    16 Jan 2006 						      msgdsize(9F)