glibc (2.38)
1 /* Copyright (C) 1995-2023 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 #define _SYS_SEM_H 1
20
21 #include <features.h>
22
23 #define __need_size_t
24 #include <stddef.h>
25
26 /* Get common definition of System V style IPC. */
27 #include <sys/ipc.h>
28
29 /* Get system dependent definition of `struct semid_ds' and more. */
30 #include <bits/sem.h>
31
32 #ifdef __USE_GNU
33 # include <bits/types/struct_timespec.h>
34 #endif
35
36 /* The following System V style IPC functions implement a semaphore
37 handling. The definition is found in XPG2. */
38
39 /* Structure used for argument to `semop' to describe operations. */
40 struct sembuf
41 {
42 unsigned short int sem_num; /* semaphore number */
43 short int sem_op; /* semaphore operation */
44 short int sem_flg; /* operation flag */
45 };
46
47
48 __BEGIN_DECLS
49
50 /* Semaphore control operation. */
51 #ifndef __USE_TIME_BITS64
52 extern int semctl (int __semid, int __semnum, int __cmd, ...) __THROW;
53 #else
54 # ifdef __REDIRECT_NTH
55 extern int __REDIRECT_NTH (semctl,
56 (int __semid, int __semnum, int __cmd, ...),
57 __semctl64);
58 # else
59 # define semctl __semctl64
60 # endif
61 #endif
62
63 /* Get semaphore. */
64 extern int semget (key_t __key, int __nsems, int __semflg) __THROW;
65
66 /* Operate on semaphore. */
67 extern int semop (int __semid, struct sembuf *__sops, size_t __nsops) __THROW;
68
69 #ifdef __USE_GNU
70 /* Operate on semaphore with timeout. */
71 # ifndef __USE_TIME_BITS64
72 extern int semtimedop (int __semid, struct sembuf *__sops, size_t __nsops,
73 const struct timespec *__timeout) __THROW;
74 # else
75 # ifdef __REDIRECT_NTH
76 extern int __REDIRECT_NTH (semtimedop, (int __semid, struct sembuf *__sops,
77 size_t __nsops,
78 const struct timespec *__timeout),
79 __semtimedop64);
80 # else
81 # define semtimedop __semtimedop64
82 # endif
83 # endif
84 #endif
85
86 __END_DECLS
87
88 #endif /* sys/sem.h */
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