1.7.9: mq_unlink/mq_open leaks handles

[Manuel Wienand]

Hallo,

it seems that mq_unlink and/or mq_open forget to close some handles (5 to be 
precise).
How to test:
Execute the following code and watch the number of handles in the windows 
task-manager (processes tab, you can add a column there). For me it increases 
by 5 with every loop.

Tested with this DLL: cygwin1-20110327.dll

Thanks,

Manuel




#include <stdio.h>
#include <stdlib.h>
#include <mqueue.h>
#include <string.h>
#include <errno.h>
#include <fcntl.h>
#include <unistd.h>

int main(void)
{
  int res;
  int i = 0;
  char msgQueueTestName[] = "./testQueue";
  mqd_t testQueue;
  struct mq_attr  attrQueue;
  memset(&attrQueue,0x00,sizeof(attrQueue));
  attrQueue.mq_maxmsg  = 10;  /* room for X messages in the queue */
  attrQueue.mq_msgsize = 20;  /* maximum size of a message */

  while(1)
  {
    sleep(1);
    i++;
    printf("Loop #%d\n", i); fflush(stdout);

    // Remove old queues before trying to create a new one.
    res = mq_unlink(msgQueueTestName);
    if ((res == -1) && (errno != ENOENT))
    {
      // Don't print anything if the queue can't be unlinked, because it 
doesn't exist.
     printf("Failed to unlink msg queue %s: %s %d\n", msgQueueTestName, 
sys_errlist[errno],errno);
    }

    testQueue = mq_open(msgQueueTestName, O_RDWR | O_CREAT | O_EXCL, S_IRWXU | 
S_IRWXG, &attrQueue);
    if( testQueue == (mqd_t)-1 )
    {
      printf("Failed to open msg queue %s: %s %d\n", msgQueueTestName, 
sys_errlist[errno],errno);
    }

    res = mq_unlink(msgQueueTestName);
    if (res == -1)
    {
      printf("Failed to unlink msg queue %s: %s %d\n", msgQueueTestName, 
sys_errlist[errno],errno);
    }
  }

        return EXIT_SUCCESS;
}


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