Index for Section 9r

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datamsg(9r)
NAME
  datamsg - STREAMS: Tests whether a message is a data message

SYNOPSIS
  #include <sys/stream.h>

  int datamsg(
	  unsigned char type );

ARGUMENTS
  type
      Specifies the type of message to be tested. The db_type member of the
      datab structure contains the message type. You can access this member
      through the message block as follows: mp->b_datap->db_type

DESCRIPTION
  The datamsg interface tests the type of message to determine if it is a
  data message type.

  The following list identifies the data message value types:

  M_DATA  Ordinary data

  M_DELAY Requests a real-time delay

  M_PROTO Internal control information and data

  M_PCPROTO
	  Same meaning as the M_PROTO except for priority

RETURN VALUES
  If the message is a data message, datamsg returns the value 1. If the
  message is not a data message, datamsg returns the value zero (0).

SEE ALSO
  Kernel Interfaces: allocb(9r)

  Programmer's Guide: STREAMS

Index for Section 9r

Alphabetical listing for D

Top of page