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Technical Reference: Communications, Volume 2

backq Utility

Purpose

Returns a pointer to the queue behind a given queue.

Syntax


queue_t *
backq(q)
register queue_t * q;

Description

The backq utility returns a pointer to the queue preceding a given queue. If no such queue exists (as when the q parameter points to a stream end), the backq utility returns a null pointer.

This utility is part of STREAMS Kernel Extensions.

Parameters

q Specifies the queue from which to begin.

Return Values

The backq utility returns a pointer to the queue behind a given queue. If no such queue exists, the backq utility returns a null pointer.

Related Information

The RD utility, WR utility.

List of Streams Programming References and Understanding STREAMS Messages in AIX 5L Version 5.2 Communications Programming Concepts.

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