solaris Man Page: datamsg(9f)

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datamsg(9F) manual page Table of Contents

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).

Arguments

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

datamsg() 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

if the message is a data message

otherwise.

Context

datamsg() can be called from user or interrupt context.

Examples

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  }