datamsg man page on DigitalUNIX

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datamsg(9r)							   datamsg(9r)

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

       #include <sys/stream.h>

       int datamsg(
	       unsigned char 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

       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

       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).

       Kernel Interfaces: allocb(9r)

       Programmer's Guide: STREAMS


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