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Copyright 1989 AT&T
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queclass - a STREAMS macro that returns the queue message class definitions for a given message block

#include <sys/stream.h> 

queclass(mblk_t *bp);

Solaris DDI specific (Solaris DDI)

queclass returns the queue message class definition for a given data block pointed to by the message block bp passed in.

The message can be either QNORM, a normal priority message, or QPCTL, a high priority message.

STREAMS Programming Guide