sysvipc/sys/sem.h

   1 /* Copyright (C) 1995-1999, 2000 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, write to the Free
  16    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  17    02111-1307 USA.  */
  18
  19 #ifndef _SYS_SEM_H
  20 #define _SYS_SEM_H      1
  21
  22 #include <features.h>
  23
  24 #define __need_size_t
  25 #include <stddef.h>
  26
  27 /* Get common definition of System V style IPC.  */
  28 #include <sys/ipc.h>
  29
  30 /* Get system dependent definition of `struct semid_ds' and more.  */
  31 #include <bits/sem.h>
  32
  33 /* The following System V style IPC functions implement a semaphore
  34    handling.  The definition is found in XPG2.  */
  35
  36 /* Structure used for argument to `semop' to describe operations.  */
  37 struct sembuf
  38 {
  39   unsigned short int sem_num;   /* semaphore number */
  40   short int sem_op;             /* semaphore operation */
  41   short int sem_flg;            /* operation flag */
  42 };
  43
  44
  45 __BEGIN_DECLS
  46
  47 /* Semaphore control operation.  */
  48 extern int semctl (int __semid, int __semnum, int __cmd, ...) __THROW;
  49
  50 /* Get semaphore.  */
  51 extern int semget (key_t __key, int __nsems, int __semflg) __THROW;
  52
  53 /* Operate on semaphore.  */
  54 extern int semop (int __semid, struct sembuf *__sops, size_t __nsops) __THROW;
  55
  56 __END_DECLS
  57
  58 #endif /* sys/sem.h */