sysdeps/unix/sysv/linux/bits/sem.h

   1 /* Copyright (C) 1995, 1996, 1997, 1998, 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 # 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   unsigned long int __unused1;
  44   __time_t sem_ctime;                   /* last time changed by semctl() */
  45   unsigned long int __unused2;
  46   unsigned long int sem_nsems;          /* number of semaphores in set */
  47   unsigned long int __unused3;
  48   unsigned long int __unused4;
  49 };
  50
  51 /* The user should define a union like the following to use it for arguments
  52    for `semctl'.
  53
  54    union semun
  55    {
  56      int val;                           <= value for SETVAL
  57      struct semid_ds *buf;              <= buffer for IPC_STAT & IPC_SET
  58      unsigned short int *array;         <= array for GETALL & SETALL
  59      struct seminfo *__buf;             <= buffer for IPC_INFO
  60    };
  61
  62    Previous versions of this file used to define this union but this is
  63    incorrect.  One can test the macro _SEM_SEMUN_UNDEFINED to see whether
  64    one must define the union or not.  */
  65 #define _SEM_SEMUN_UNDEFINED    1
  66
  67 #ifdef __USE_MISC
  68
  69 /* ipcs ctl cmds */
  70 # define SEM_STAT 18
  71 # define SEM_INFO 19
  72
  73 struct  seminfo
  74 {
  75   int semmap;
  76   int semmni;
  77   int semmns;
  78   int semmnu;
  79   int semmsl;
  80   int semopm;
  81   int semume;
  82   int semusz;
  83   int semvmx;
  84   int semaem;
  85 };
  86
  87 #endif /* __USE_MISC */