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88 lines
2.6 KiB
C
88 lines
2.6 KiB
C
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/* Copyright (C) 1995, 1996, 1997, 1998, 2000 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If not,
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write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#ifndef _SYS_SEM_H
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# error "Never include <bits/sem.h> directly; use <sys/sem.h> instead."
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#endif
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#include <sys/types.h>
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/* Flags for `semop'. */
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#define SEM_UNDO 0x1000 /* undo the operation on exit */
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/* Commands for `semctl'. */
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#define GETPID 11 /* get sempid */
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#define GETVAL 12 /* get semval */
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#define GETALL 13 /* get all semval's */
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#define GETNCNT 14 /* get semncnt */
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#define GETZCNT 15 /* get semzcnt */
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#define SETVAL 16 /* set semval */
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#define SETALL 17 /* set all semval's */
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/* Data structure describing a set of semaphores. */
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struct semid_ds
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{
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struct ipc_perm sem_perm; /* operation permission struct */
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__time_t sem_otime; /* last semop() time */
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unsigned long int __unused1;
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__time_t sem_ctime; /* last time changed by semctl() */
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unsigned long int __unused2;
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unsigned long int sem_nsems; /* number of semaphores in set */
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unsigned long int __unused3;
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unsigned long int __unused4;
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};
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/* The user should define a union like the following to use it for arguments
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for `semctl'.
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union semun
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{
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int val; <= value for SETVAL
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struct semid_ds *buf; <= buffer for IPC_STAT & IPC_SET
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unsigned short int *array; <= array for GETALL & SETALL
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struct seminfo *__buf; <= buffer for IPC_INFO
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};
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Previous versions of this file used to define this union but this is
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incorrect. One can test the macro _SEM_SEMUN_UNDEFINED to see whether
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one must define the union or not. */
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#define _SEM_SEMUN_UNDEFINED 1
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#ifdef __USE_MISC
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/* ipcs ctl cmds */
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# define SEM_STAT 18
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# define SEM_INFO 19
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struct seminfo
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{
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int semmap;
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int semmni;
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int semmns;
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int semmnu;
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int semmsl;
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int semopm;
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int semume;
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int semusz;
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int semvmx;
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int semaem;
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};
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#endif /* __USE_MISC */
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