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Full Discussion: Permission denied when creating message queue
Top Forums Programming Permission denied when creating message queue Post 302453264 by Corona688 on Tuesday 14th of September 2010 04:00:37 PM
Old 09-14-2010
From man mq_overview:

Code:
Message queues are created and opened using mq_open(3);  this  function
       returns  a  message queue descriptor (mqd_t), which is used to refer to
       the open message queue in later calls.  Each message queue  is  identi-
       fied by a name of the form /somename; that is, a null-terminated string
       of up to NAME_MAX (i.e.,  255)  characters  consisting  of  an  initial
       slash,  followed  by one or more characters, none of which are slashes.
       Two processes can operate on the same queue by passing the same name to
       mq_open(3).

Message queues aren't really files. You don't create them under /tmp/.
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LEARN ABOUT PHP

canput

canput(9F)						   Kernel Functions for Drivers 						canput(9F)

NAME

       canput - test for room in a message queue

SYNOPSIS

       #include <sys/stream.h>

       int canput(queue_t *q);

INTERFACE LEVEL

       Architecture independent level 1 (DDI/DKI).

PARAMETERS

       q	Pointer to the message queue.

DESCRIPTION

       canput() searches through the stream (starting at q) until it finds a queue containing a service routine where the message can be enqueued,
       or until it reaches the end of the stream.  If found, the queue containing the service routine is tested to see if there is room for a mes-
       sage in the queue.

       canputnext(q) and bcanputnext(q, pri) should always be used in preference to canput(q->q_next) and bcanput(q->q_next, pri) respectively.

RETURN VALUES

       1	If the message queue is not full.

       0	If the queue is full.

CONTEXT

       canput() can be called from user or interrupt context.

SEE ALSO

       bcanput(9F), bcanputnext(9F), canputnext(9F), putbq(9F), putnext(9F)

       Writing Device Drivers

	STREAMS Programming Guide

WARNINGS

       Drivers are responsible for both testing a queue with canput() and refraining from placing a message on the queue if canput() fails.

SunOS 5.10							    11 Apr 1991 							canput(9F)
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