libc/sysdeps/linux/common/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, see
  16    <http://www.gnu.org/licenses/>.  */
  17
  18 #ifndef _SYS_SEM_H
  19 # error "Never include <bits/sem.h> directly; use <sys/sem.h> instead."
  20 #endif
  21
  22 #include <sys/types.h>
  23 #include <bits/wordsize.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
  43   unsigned long int __sem_otime_internal_1;
  44   unsigned long int __sem_otime_internal_2;
  45   unsigned long int __sem_ctime_internal_1;
  46   unsigned long int __sem_ctime_internal_2;
  47 #if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
  48   unsigned short int sem_nsems;         /* number of semaphores in set */
  49   char __paddind[sizeof(long int) - sizeof(short int)];
  50 #else
  51   char __padding[sizeof(long int) - sizeof(short int)];
  52   unsigned short int sem_nsems;         /* number of semaphores in set */
  53 #endif
  54   unsigned long int __uclibc_unused3;
  55   unsigned long int __uclibc_unused4;
  56   __time_t sem_otime;                   /* last semop() time */
  57   __time_t sem_ctime;                   /* last time changed by semctl() */
  58 };
  59
  60 /* The user should define a union like the following to use it for arguments
  61    for `semctl'.
  62
  63    union semun
  64    {
  65      int val;                           <= value for SETVAL
  66      struct semid_ds *buf;              <= buffer for IPC_STAT & IPC_SET
  67      unsigned short int *array;         <= array for GETALL & SETALL
  68      struct seminfo *__buf;             <= buffer for IPC_INFO
  69    };
  70
  71    Previous versions of this file used to define this union but this is
  72    incorrect.  One can test the macro _SEM_SEMUN_UNDEFINED to see whether
  73    one must define the union or not.  */
  74 #define _SEM_SEMUN_UNDEFINED    1
  75
  76 #ifdef __USE_MISC
  77
  78 /* ipcs ctl cmds */
  79 # define SEM_STAT 18
  80 # define SEM_INFO 19
  81
  82 struct  seminfo
  83 {
  84   int semmap;
  85   int semmni;
  86   int semmns;
  87   int semmnu;
  88   int semmsl;
  89   int semopm;
  90   int semume;
  91   int semusz;
  92   int semvmx;
  93   int semaem;
  94 };
  95
  96 #endif /* __USE_MISC */