osf1 man page for msgdsize

msgdsize(9r)															      msgdsize(9r)

NAME
       msgdsize - STREAMS: Returns the number of bytes in a message

SYNOPSIS
       #include <sys/stream.h>

       int msgdsize(
	       MBLKP message_block_ptr );

ARGUMENTS
       Specifies a pointer to the message block to be evaluated.  The typedef MBLKP is an alternate name for typedef struct msgb *.

DESCRIPTION
       The  msgdsize  interface counts the number of bytes in a data message. Only bytes included in the data blocks with a message type of M_DATA
       (ordinary data) is included in the count.

RETURN VALUES
       Upon successful completion, the msgdsize interface returns the number of data bytes in a message, expressed as an integer.

																      msgdsize(9r)