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From: Manuel Wienand <Manuel.Wienand@ubitronix.com>
To: "cygwin@cygwin.com" <cygwin@cygwin.com>
Date: Mon, 04 Apr 2011 13:06:00 -0000
Subject: 1.7.9: mq_unlink/mq_open leaks handles
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Hallo,

it seems that mq_unlink and/or mq_open forget to close some handles (5 to b=
e precise).
How to test:
Execute the following code and watch the number of handles in the windows t=
ask-manager (processes tab, you can add a column there). For me it increase=
s 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 =3D 0;
  char msgQueueTestName[] =3D "./testQueue";
  mqd_t testQueue;
  struct mq_attr  attrQueue;
  memset(&attrQueue,0x00,sizeof(attrQueue));
  attrQueue.mq_maxmsg  =3D 10;  /* room for X messages in the queue */
  attrQueue.mq_msgsize =3D 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 =3D mq_unlink(msgQueueTestName);
    if ((res =3D=3D -1) && (errno !=3D ENOENT))
    {
      // Don't print anything if the queue can't be unlinked, because it do=
esn't exist.
     printf("Failed to unlink msg queue %s: %s %d\n", msgQueueTestName, sys=
_errlist[errno],errno);
    }

    testQueue =3D mq_open(msgQueueTestName, O_RDWR | O_CREAT | O_EXCL, S_IR=
WXU | S_IRWXG, &attrQueue);
    if( testQueue =3D=3D (mqd_t)-1 )
    {
      printf("Failed to open msg queue %s: %s %d\n", msgQueueTestName, sys_=
errlist[errno],errno);
    }

    res =3D mq_unlink(msgQueueTestName);
    if (res =3D=3D -1)
    {
      printf("Failed to unlink msg queue %s: %s %d\n", msgQueueTestName, sy=
s_errlist[errno],errno);
    }
  }

	return EXIT_SUCCESS;
}


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