1 | /* Copyright (C) 1995-2020 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/sem-pad.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 | #if __SEM_PAD_BEFORE_TIME |
39 | # define __SEM_PAD_TIME(NAME, RES) \ |
40 | __syscall_ulong_t __glibc_reserved ## RES; __time_t NAME |
41 | #elif __SEM_PAD_AFTER_TIME |
42 | # define __SEM_PAD_TIME(NAME, RES) \ |
43 | __time_t NAME; __syscall_ulong_t __glibc_reserved ## RES |
44 | #else |
45 | # define __SEM_PAD_TIME(NAME, RES) \ |
46 | __time_t NAME |
47 | #endif |
48 | |
49 | /* Data structure describing a set of semaphores. */ |
50 | struct semid_ds |
51 | { |
52 | struct ipc_perm sem_perm; /* operation permission struct */ |
53 | __SEM_PAD_TIME (sem_otime, 1); /* last semop() time */ |
54 | __SEM_PAD_TIME (sem_ctime, 2); /* last time changed by semctl() */ |
55 | __syscall_ulong_t sem_nsems; /* number of semaphores in set */ |
56 | __syscall_ulong_t __glibc_reserved3; |
57 | __syscall_ulong_t __glibc_reserved4; |
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 | # define SEM_STAT_ANY 20 |
82 | |
83 | struct seminfo |
84 | { |
85 | int semmap; |
86 | int semmni; |
87 | int semmns; |
88 | int semmnu; |
89 | int semmsl; |
90 | int semopm; |
91 | int semume; |
92 | int semusz; |
93 | int semvmx; |
94 | int semaem; |
95 | }; |
96 | |
97 | #endif /* __USE_MISC */ |
98 | |