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Date: Mon, 18 Aug 2008 18:43:55 -0700
From: Linh Phan <phan AT mail DOT jpl DOT nasa DOT gov>
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To: cygwin AT cygwin DOT com
Subject: cygwin 1.7 message queues can't open more than 1 queue?
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Hi,

  I downloaded cygwin 1.7 to use message queues but unfortunately, the 
message queues only allows me to open
1 message queue.  If I try to open a second one, it fails with 
"Permission denied".  Below is the test I used:

#include <stdio.h>
#include <mqueue.h>
#include <fcntl.h>
main()
{
  int flags = O_RDWR | O_NONBLOCK | O_CREAT | O_EXCL;
  struct mq_attr attr;
  char queue[33];
  char *e;
  mode_t mode = strtoul("644", &e, 8);
  mqd_t mqd;

  memset((void *) &attr, 0, sizeof(struct mq_attr));
  attr.mq_maxmsg = (long) 10;
  attr.mq_msgsize = (long) 24;

  strcpy(queue, "/queue0");
  mq_unlink(queue);
  mqd = mq_open(queue, flags, mode, &attr);
  strcpy(queue, "/queue1");
  mq_unlink(queue);
  mqd = mq_open(queue, flags, mode, &attr); // ALWAYS FAIL HERE WITH 
"Permission denied"
  perror("mq_open");
}

Does anyone know what I did wrong?

Thank you,

Linh


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