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Full Discussion: Permission denied when creating message queue
Top Forums Programming Permission denied when creating message queue Post 302453261 by majid.merkava on Tuesday 14th of September 2010 03:47:05 PM
Old 09-14-2010
Permission denied when creating message queue
Hi guys.

i have wrote a simple program to test message queue attributes. here it is:
Code:
#include <stdio.h>
#include <stdlib.h>
#include <mqueue.h>
#include <fcntl.h>   
#include <string.h>
#include <errno.h>
#include <sys/stat.h>

int main()
{
    struct mq_attr attr;
    mqd_t mqd;
    if ((mqd = mq_open("/tmp/queue.123", O_RDWR | O_CREAT, S_IRUSR | S_IWUSR, NULL)) == -1)
    {
        printf("damn it: %s\n", strerror(errno));
        exit(EXIT_FAILURE);
    }
    mq_getattr(mqd, &attr);
    printf("max message on queue: %ld\n", attr.mq_maxmsg);
    printf("max message size: %ld\n", attr.mq_msgsize);
    printf("current number of message on the queue: %ld\n", attr.mq_curmsgs);
    mq_close(mqd);
    mq_unlink("/tmp/queue.123");
    return EXIT_SUCCESS;
}

but when i run it always it prints:
Code:
damn it: Permission denied

I executed it under root user but again this error.
also permissions for /tmp directory is 777.
 

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LEARN ABOUT PHP

msg_get_queue

MSG_GET_QUEUE(3)							 1							  MSG_GET_QUEUE(3)

msg_get_queue - Create or attach to a message queue

SYNOPSIS

       resource msg_get_queue (int  $key, [int	$perms = 0666])

DESCRIPTION

       msg_get_queue(3)  returns  an id that can be used to access the System V message queue with the given $key. The first call creates the mes-
       sage queue with the optional $perms. A second call to msg_get_queue(3) for the same $key will return a different message queue  identifier,
       but both identifiers access the same underlying message queue.

PARAMETERS

	      o $key
		- Message queue numeric ID

	      o $perms
		- Queue permissions. Default to 0666. If the message queue already exists, the $perms will be ignored.

RETURN VALUES

	Returns a resource handle that can be used to access the System V message queue.

SEE ALSO

       msg_remove_queue(3), msg_receive(3), msg_send(3), msg_stat_queue(3), msg_set_queue(3).

PHP Documentation Group 													  MSG_GET_QUEUE(3)
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