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NAME
SYNOPSIS
INTERFACE LEVEL
PARAMETERS
DESCRIPTION
RETURN VALUES
CONTEXT
EXAMPLES
SEE ALSO

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

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

1: if the message is a data message
0: otherwise.

CONTEXT

datamsg() can be called from user or interrupt 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 }