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