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/* Copyright 2002, Red Hat Inc. */

#include <mqueue.h>

#include <errno.h>

#include <fcntl.h>

#include <sys/stat.h>

#include <sys/mman.h>

#include <sys/ipc.h>

#include <sys/sem.h>

#include <string.h>

#include <stdlib.h>

#include <machine/weakalias.h>

#define _LIBC 1

#include <sys/lock.h>

#undef _LIBC

#include "mqlocal.h"

int

mq_unlink (const char *name)

{

  int size;

  int saved_errno;

  char *real_name;

  char *ptr;

  int i, rc;

  int semid, msgqid;

  key_t key;

  /* ignore opening slash if present */

  if (*name == '/')

    ++name;

  size = strlen(name);

  if ((real_name = (char *)malloc (size + sizeof(MSGQ_PREFIX))) == NULL)

    {

      errno = ENOSPC;

      return -1;

    }

  /* use given name to create shared memory file name - we convert any

     slashes to underscores so we don't have to create directories */

  memcpy (real_name, MSGQ_PREFIX, sizeof(MSGQ_PREFIX) - 1);

  memcpy (real_name + sizeof(MSGQ_PREFIX) - 1, name, size + 1);

  ptr = real_name + sizeof(MSGQ_PREFIX) - 1;

  for (i = 0; i < size; ++i)

    {

      if (*ptr == '/')

        *ptr = '_';

      ++ptr;

    }

  /* get key and then unlink shared memory file */

  if ((key = ftok(real_name, 255)) == (key_t)-1)

    return -1;

  rc = unlink (real_name);

  if (rc == 0)

    {

      /* try to remove semaphore and msg queues associated with shared memory file */

      saved_errno = errno;

      semid = semget (key, 6, 0);

      if (semid != -1)

        semctl (semid, 0, IPC_RMID);

      msgqid = msgget (key, 0);

      if (msgqid != -1)

        msgctl (msgqid, IPC_RMID, NULL);

      errno = saved_errno;

    }

  return rc;

}