sysvipc/sys/sem.h

   1 /* Copyright (C) 1995, 1996, 1997, 1998 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 Library General Public License as
   6    published by the Free Software Foundation; either version 2 of the
   7    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    Library General Public License for more details.
  13
  14    You should have received a copy of the GNU Library General Public
  15    License along with the GNU C Library; see the file COPYING.LIB.  If not,
  16    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  17    Boston, MA 02111-1307, USA.  */
  18
  19 #ifndef _SYS_SEM_H
  20 #define _SYS_SEM_H      1
  21
  22 #include <features.h>
  23
  24 #include <sys/types.h>
  25
  26 /* Get common definition of System V style IPC.  */
  27 #include <sys/ipc.h>
  28
  29 /* Get system dependent definition of `struct semid_ds' and more.  */
  30 #include <bits/sem.h>
  31
  32 /* The following System V style IPC functions implement a semaphore
  33    handling.  The definition is found in XPG2.  */
  34
  35 /* Structure used for argument to `semop' to describe operations.  */
  36 struct sembuf
  37 {
  38   short int sem_num;            /* semaphore number */
  39   short int sem_op;             /* semaphore operation */
  40   short int sem_flg;            /* operation flag */
  41 };
  42
  43
  44 __BEGIN_DECLS
  45
  46 /* Semaphore control operation.  */
  47 extern int semctl __P ((int __semid, int __semnum, int __cmd, ...));
  48
  49 /* Get semaphore.  */
  50 extern int semget __P ((key_t __key, int __nsems, int __semflg));
  51
  52 /* Operate on semaphore.  */
  53 extern int semop __P ((int __semid, struct sembuf *__sops,
  54                        unsigned int __nsops));
  55
  56 __END_DECLS
  57
  58 #endif /* sys/sem.h */