usr/src/cmd/sendmail/include/sm/sem.h

   1 /*
   2  * Copyright (c) 2000-2001, 2005, 2008 Sendmail, Inc. and its suppliers.
   3  *      All rights reserved.
   4  *
   5  * By using this file, you agree to the terms and conditions set
   6  * forth in the LICENSE file which can be found at the top level of
   7  * the sendmail distribution.
   8  *
   9  *      $Id: sem.h,v 1.10 2008/05/30 16:26:39 ca Exp $
  10  */
  11
  12 #ifndef SM_SEM_H
  13 # define SM_SEM_H 1
  14
  15 #include <sm/gen.h>
  16
  17 /* key for semaphores */
  18 # define SM_SEM_KEY     (41L)
  19 # define SM_SEM_NO_ID   (-1)
  20 # define SM_NO_SEM(id)  ((id) < 0)
  21
  22 # if SM_CONF_SEM > 0
  23 #  include <sys/types.h>
  24 #  include <sys/ipc.h>
  25 #  include <sys/sem.h>
  26
  27 # if SM_CONF_SEM == 2
  28 union semun
  29 {
  30         int             val;
  31         struct semid_ds *buf;
  32         ushort          *array;
  33 };
  34 # endif /* SM_CONF_SEM == 2 */
  35
  36 # ifndef SEM_A
  37 #  define SEM_A 0200
  38 # endif /* SEM_A */
  39 # ifndef SEM_R
  40 #  define SEM_R 0400
  41 # endif /* SEM_R */
  42
  43 # define SM_NSEM        1
  44
  45 extern int sm_sem_start __P((key_t, int, int, bool));
  46 extern int sm_sem_stop __P((int));
  47 extern int sm_sem_acq __P((int, int, int));
  48 extern int sm_sem_rel __P((int, int, int));
  49 extern int sm_sem_get __P((int, int));
  50 extern int sm_semsetowner __P((int, uid_t, gid_t, mode_t));
  51
  52 # else /* SM_CONF_SEM > 0 */
  53 #  define sm_sem_start(key, nsem, semflg, owner) 0
  54 #  define sm_sem_stop(semid)    0
  55 #  define sm_sem_acq(semid, semnum, timeout)    0
  56 #  define sm_sem_rel(semid, semnum, timeout)    0
  57 #  define sm_sem_get(semid, semnum)     0
  58 # endif /* SM_CONF_SEM > 0 */
  59
  60 #endif /* ! SM_SEM_H */