include/bits/sem.h

   1 /* Copyright (C) 1995-2021 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    <https://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/timesize.h>
  24 #include <bits/types/struct_semid_ds.h>
  25
  26 /* Flags for `semop'.  */
  27 #define SEM_UNDO        0x1000          /* undo the operation on exit */
  28
  29 /* Commands for `semctl'.  */
  30 #define GETPID          11              /* get sempid */
  31 #define GETVAL          12              /* get semval */
  32 #define GETALL          13              /* get all semval's */
  33 #define GETNCNT         14              /* get semncnt */
  34 #define GETZCNT         15              /* get semzcnt */
  35 #define SETVAL          16              /* set semval */
  36 #define SETALL          17              /* set all semval's */
  37
  38 /* The user should define a union like the following to use it for arguments
  39    for `semctl'.
  40
  41    union semun
  42    {
  43      int val;                           <= value for SETVAL
  44      struct semid_ds *buf;              <= buffer for IPC_STAT & IPC_SET
  45      unsigned short int *array;         <= array for GETALL & SETALL
  46      struct seminfo *__buf;             <= buffer for IPC_INFO
  47    };
  48
  49    Previous versions of this file used to define this union but this is
  50    incorrect.  One can test the macro _SEM_SEMUN_UNDEFINED to see whether
  51    one must define the union or not.  */
  52 #define _SEM_SEMUN_UNDEFINED    1
  53
  54 #ifdef __USE_MISC
  55
  56 /* ipcs ctl cmds */
  57 # define SEM_STAT 18
  58 # define SEM_INFO 19
  59 # define SEM_STAT_ANY 20
  60
  61 struct  seminfo
  62 {
  63   int semmap;
  64   int semmni;
  65   int semmns;
  66   int semmnu;
  67   int semmsl;
  68   int semopm;
  69   int semume;
  70   int semusz;
  71   int semvmx;
  72   int semaem;
  73 };
  74
  75 #endif /* __USE_MISC */