sysdeps/unix/sysv/linux/bits/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 # error "Never include <bits/sem.h> directly; use <sys/sem.h> instead."
  21 #endif
  22
  23 #include <sys/types.h>
  24
  25 /* Flags for `semop'.  */
  26 #define SEM_UNDO        0x1000          /* undo the operation on exit */
  27
  28 /* Commands for `semctl'.  */
  29 #define GETPID          11              /* get sempid */
  30 #define GETVAL          12              /* get semval */
  31 #define GETALL          13              /* get all semval's */
  32 #define GETNCNT         14              /* get semncnt */
  33 #define GETZCNT         15              /* get semzcnt */
  34 #define SETVAL          16              /* set semval */
  35 #define SETALL          17              /* set all semval's */
  36
  37
  38 /* Data structure describing a set of semaphores.  */
  39 struct semid_ds
  40 {
  41   struct ipc_perm sem_perm;             /* operation permission struct */
  42   __time_t sem_otime;                   /* last semop() time */
  43   __time_t sem_ctime;                   /* last time changed by semctl() */
  44   struct sem *__sembase;                /* ptr to first semaphore in array */
  45   struct sem_queue *__sem_pending;      /* pending operations */
  46   struct sem_queue *__sem_pending_last; /* last pending operation */
  47   struct sem_undo *__undo;              /* ondo requests on this array */
  48   unsigned short int sem_nsems;         /* number of semaphores in set */
  49 };
  50
  51
  52 /* The user should define a union like the following to use it for arguments
  53    for `semctl'.
  54
  55    union semun
  56    {
  57      int val;                           <= value for SETVAL
  58      struct semid_ds *buf;              <= buffer for IPC_STAT & IPC_SET
  59      unsigned short int *array;         <= array for GETALL & SETALL
  60      struct seminfo *__buf;             <= buffer for IPC_INFO
  61    };
  62
  63    Previous versions of this file used to define this union but this is
  64    incorrect.  One can test the macro _SEM_SEMUN_UNDEFINED to see whether
  65    one must define the union or not.  */
  66 #define _SEM_SEMUN_UNDEFINED    1
  67
  68 #ifdef __USE_MISC
  69
  70 /* ipcs ctl cmds */
  71 # define SEM_STAT 18
  72 # define SEM_INFO 19
  73
  74 struct  seminfo
  75 {
  76   int semmap;
  77   int semmni;
  78   int semmns;
  79   int semmnu;
  80   int semmsl;
  81   int semopm;
  82   int semume;
  83   int semusz;
  84   int semvmx;
  85   int semaem;
  86 };
  87
  88 #endif /* __USE_MISC */