1/*
2 * Copyright (C) 2016 The Android Open Source Project
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 *  * Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 *  * Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in
12 *    the documentation and/or other materials provided with the
13 *    distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
16 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
17 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
18 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
19 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
21 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
22 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
23 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
24 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
25 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29#include <sys/sem.h>
30
31#include <stdarg.h>
32#include <sys/syscall.h>
33#include <unistd.h>
34
35int semctl(int id, int num, int cmd, ...) {
36#if !defined(__LP64__) || defined(__mips__)
37  // Annoyingly, the kernel requires this for 32-bit but rejects it for 64-bit.
38  // Mips64 is an exception to this, it requires the flag.
39  cmd |= IPC_64;
40#endif
41  va_list ap;
42  va_start(ap, cmd);
43  semun arg = va_arg(ap, semun);
44  va_end(ap);
45#if defined(SYS_semctl)
46  return syscall(SYS_semctl, id, num, cmd, arg);
47#else
48  return syscall(SYS_ipc, SEMCTL, id, num, cmd, &arg, 0);
49#endif
50}
51
52int semget(key_t key, int n, int flags) {
53#if defined(SYS_semget)
54  return syscall(SYS_semget, key, n, flags);
55#else
56  return syscall(SYS_ipc, SEMGET, key, n, flags, 0, 0);
57#endif
58}
59
60int semop(int id, sembuf* ops, size_t op_count) {
61  return semtimedop(id, ops, op_count, nullptr);
62}
63
64int semtimedop(int id, sembuf* ops, size_t op_count, const timespec* ts) {
65#if defined(SYS_semtimedop)
66  return syscall(SYS_semtimedop, id, ops, op_count, ts);
67#else
68  return syscall(SYS_ipc, SEMTIMEDOP, id, op_count, 0, ops, ts);
69#endif
70}
71