projects / thirdparty / glibc.git / blame
| Commit | Line | Data |
|---|---|---|
| d4697bc9 | 1 | /* Copyright (C) 1995-2014 Free Software Foundation, Inc. |
| 6d52618b | 2 | This file is part of the GNU C Library. |
| 60478656 | 3 | |
| 6d52618b | 4 | The GNU C Library is free software; you can redistribute it and/or |
| 41bdb6e2 AJ |
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. | |
| 60478656 | 8 | |
| 6d52618b UD |
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 | |
| 41bdb6e2 | 12 | Lesser General Public License for more details. |
| 60478656 | 13 | |
| 41bdb6e2 | 14 | You should have received a copy of the GNU Lesser General Public |
| 59ba27a6 PE |
15 | License along with the GNU C Library; if not, see |
| 16 | <http://www.gnu.org/licenses/>. */ | |
| 60478656 | 17 | |
| 5107cf1d | 18 | #ifndef _SYS_SEM_H |
| f4017d20 | 19 | # error "Never include <bits/sem.h> directly; use <sys/sem.h> instead." |
| 5107cf1d UD |
20 | #endif |
| 21 | ||
| 60478656 RM |
22 | #include <sys/types.h> |
| 23 | ||
| 24 | /* Flags for `semop'. */ | |
| 25 | #define SEM_UNDO 0x1000 /* undo the operation on exit */ | |
| 26 | ||
| 27 | /* Commands for `semctl'. */ | |
| 28 | #define GETPID 11 /* get sempid */ | |
| 29 | #define GETVAL 12 /* get semval */ | |
| 30 | #define GETALL 13 /* get all semval's */ | |
| 31 | #define GETNCNT 14 /* get semncnt */ | |
| 32 | #define GETZCNT 15 /* get semzcnt */ | |
| 33 | #define SETVAL 16 /* set semval */ | |
| 34 | #define SETALL 17 /* set all semval's */ | |
| 35 | ||
| 36 | ||
| 60478656 RM |
37 | /* Data structure describing a set of semaphores. */ |
| 38 | struct semid_ds | |
| 39 | { | |
| 6d52618b | 40 | struct ipc_perm sem_perm; /* operation permission struct */ |
| 60478656 RM |
41 | __time_t sem_otime; /* last semop() time */ |
| 42 | __time_t sem_ctime; /* last time changed by semctl() */ | |
| 43 | unsigned short int sem_nsems; /* number of semaphores in set */ | |
| 44 | }; | |
| 45 | ||
| 977bfd77 UD |
46 | /* The user should define a union like the following to use it for arguments |
| 47 | for `semctl'. | |
| 48 | ||
| 49 | union semun | |
| 50 | { | |
| 51 | int val; <= value for SETVAL | |
| 52 | struct semid_ds *buf; <= buffer for IPC_STAT & IPC_SET | |
| 53 | unsigned short int *array; <= array for GETALL & SETALL | |
| 54 | struct seminfo *__buf; <= buffer for IPC_INFO | |
| 55 | }; | |
| 56 | ||
| 57 | Previous versions of this file used to define this union but this is | |
| 58 | incorrect. One can test the macro _SEM_SEMUN_UNDEFINED to see whether | |
| 59 | one must define the union or not. */ | |
| 60 | #define _SEM_SEMUN_UNDEFINED 1 |