sunos 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
       msgdsize() 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
       msgdsize() can be called from user or interrupt context.

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

SEE ALSO
       bufcall(9F)

       Writing Device Drivers

	STREAMS Programming Guide

SunOS 5.10							    11 Nov 1996 						      msgdsize(9F)