sys/sem_open.c

   1 /*
   2  * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License. Please obtain a copy of the License at
  10  * http://www.opensource.apple.com/apsl/ and read it before using this
  11  * file.
  12  *
  13  * The Original Code and all software distributed under the License are
  14  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  15  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  16  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  18  * Please see the License for the specific language governing rights and
  19  * limitations under the License.
  20  *
  21  * @APPLE_LICENSE_HEADER_END@
  22  */
  23
  24 #ifdef __APPLE_PR3375657_HACK__
  25
  26 #include <stdio.h>
  27 #include <semaphore.h>
  28 #include <sys/types.h>
  29 #include <unistd.h>
  30 #include <alloca.h>
  31 #include <stdarg.h>
  32 #include <string.h>
  33
  34 __private_extern__ int _sem_match(const char *name);
  35 extern sem_t *__sem_open(const char *, int, int, unsigned int);
  36
  37 sem_t *
  38 sem_open (const char *name, int flags, ...)
  39 {
  40         char            *buffer;
  41         va_list         ap;
  42         int             mode;
  43         unsigned int    value;
  44
  45         /*
  46         * To work-around applications that don't play
  47         * well in multiple GUI sessions, we append
  48         * shared memory names with the effective user ID.
  49         * It would be better to append the region name
  50         * with a session ID, but nothing like that
  51         * exists at this level of the system yet.
  52         */
  53
  54         if (_sem_match(name) && (buffer = alloca(strlen(name) + 32)) != NULL) {
  55                 sprintf(buffer, "%s\t%d", name, geteuid());
  56                 name = buffer;
  57         }
  58
  59 // sem_open (const char *name, int flags, mode_t mode, unsigned int value)
  60         va_start(ap, flags);
  61         mode = va_arg(ap, int); /* promoted from mode_t to int */
  62         value = va_arg(ap, unsigned int);
  63         va_end(ap);
  64
  65         return __sem_open(name, flags, mode, value);
  66 }
  67
  68 #endif /* __APPLE_PR3375657_HACK__ */