NAME    [Toc]    [Back]

       datamsg  - STREAMS: Tests whether a message is a data message

SYNOPSIS    [Toc]    [Back]

       #include <sys/stream.h>

       int datamsg(
               unsigned char type );

ARGUMENTS    [Toc]    [Back]

       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    [Toc]    [Back]

       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:  Ordinary  data Requests a real-time delay Internal
       control information and data Same meaning as  the  M_PROTO
       except for priority

RETURN VALUES    [Toc]    [Back]

       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    [Toc]    [Back]

       Kernel Interfaces: allocb(9r)

       Programmer's Guide: STREAMS



                                                      datamsg(9r)