sysdeps/stub/bits/sem.h

   1 /* Copyright (C) 1995, 1996, 1997 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3    Contributed by Ulrich Drepper <drepper@gnu.ai.mit.edu>, August 1995.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Library General Public License as
   7    published by the Free Software Foundation; either version 2 of the
   8    License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Library General Public License for more details.
  14
  15    You should have received a copy of the GNU Library General Public
  16    License along with the GNU C Library; see the file COPYING.LIB.  If not,
  17    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  18    Boston, MA 02111-1307, USA.  */
  19
  20 #ifndef _SYS_SEM_H
  21 #error "Never use <bits/sem.h> directly; include <sys/sem.h> instead."
  22 #endif
  23
  24
  25 #include <features.h>
  26 #include <sys/types.h>
  27
  28 /* Flags for `semop'.  */
  29 #define SEM_UNDO        0x1000          /* undo the operation on exit */
  30
  31 /* Commands for `semctl'.  */
  32 #define GETPID          11              /* get sempid */
  33 #define GETVAL          12              /* get semval */
  34 #define GETALL          13              /* get all semval's */
  35 #define GETNCNT         14              /* get semncnt */
  36 #define GETZCNT         15              /* get semzcnt */
  37 #define SETVAL          16              /* set semval */
  38 #define SETALL          17              /* set all semval's */
  39
  40
  41 __BEGIN_DECLS
  42
  43 /* Data structure describing a set of semaphores.  */
  44 struct semid_ds
  45 {
  46   struct ipc_perm sem_perm;             /* operation permission struct */
  47   __time_t sem_otime;                   /* last semop() time */
  48   __time_t sem_ctime;                   /* last time changed by semctl() */
  49   unsigned short int sem_nsems;         /* number of semaphores in set */
  50 };
  51
  52 /* Union used for argument for `semctl'.  */
  53 union semun
  54 {
  55   int val;                              /* value for SETVAL */
  56   struct semid_ds *buf;                 /* buffer for IPC_STAT & IPC_SET */
  57   unsigned short int *array;            /* array for GETALL & SETALL */
  58   struct seminfo *__buf;                /* buffer for IPC_INFO */
  59  };
  60
  61 __END_DECLS