datamsg man page on Solaris

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

NAME
       datamsg - test whether a message is a data message

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

       int datamsg(unsigned char type);

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

PARAMETERS
       type	The  type  of  message	to be tested. The db_type field of the
		datab(9S) structure contains the message type. This field  may
		be     accessed	   through    the    message	block	 using
		mp->b_datap->db_type.

DESCRIPTION
       The datamsg() function tests the type of message to determine if it  is
       a data message type (M_DATA, M_DELAY, M_PROTO , or M_PCPROTO).

RETURN VALUES
       datamsg returns

       1	if the message is a data message

       0	otherwise.

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

EXAMPLES
       Example 1: The put(9E) routine enqueues all data messages for  handling
       by  the srv(9E) (service) routine. All non-data messages are handled in
       the  put(9E) routine.

       1 xxxput(q, mp)
       2      queue_t *q;
       3      mblk_t *mp;
       4 {
       5    if (datamsg(mp->b_datap->db_type)) {
       6	    putq(q, mp);
       7	    return;
       8    }
       9    switch (mp->b_datap->db_type) {
       10    case M_FLUSH:
			...
       11    }
       12 }

SEE ALSO
       put(9E), srv(9E), allocb(9F), datab(9S), msgb(9S)

       Writing Device Drivers

       STREAMS Programming Guide

SunOS 5.10			  16 Jan 2006			   datamsg(9F)
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