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1 | /* Copyright (C) 1995-2022 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 | |
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 | |
37 | /* Data structure describing a set of semaphores. */ |
38 | struct semid_ds |
39 | { |
40 | struct ipc_perm sem_perm; /* operation permission struct */ |
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 | |
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 |
61 |
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