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

January 16, 2006 MSGDSIZE(9F)