80 lines
2.9 KiB
C
80 lines
2.9 KiB
C
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/*
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* Copyright (C) 2016 The Android Open Source Project
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include "sys_sem.h"
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#include <stdarg.h>
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#include <sys/syscall.h>
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#include <unistd.h>
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int semctl(int id, int num, int cmd, ...) {
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#if !defined(__LP64__)
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// Annoyingly, the kernel requires this for 32-bit but rejects it for 64-bit.
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cmd |= IPC_64;
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#endif
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va_list ap;
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va_start(ap, cmd);
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union semun arg = va_arg(ap, union semun);
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va_end(ap);
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#if defined(SYS_semctl)
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return syscall(SYS_semctl, id, num, cmd, arg);
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#else
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return syscall(SYS_ipc, SEMCTL, id, num, cmd, &arg, 0);
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#endif
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}
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int semget(key_t key, int n, int flags) {
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#if defined(SYS_semget)
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return syscall(SYS_semget, key, n, flags);
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#else
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return syscall(SYS_ipc, SEMGET, key, n, flags, 0, 0);
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#endif
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}
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int semop(int id, struct sembuf* ops, size_t op_count) {
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return semtimedop(id, ops, op_count, NULL);
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}
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int semtimedop(int id, struct sembuf* ops, size_t op_count, const struct timespec* ts) {
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#if defined(SYS_semtimedop)
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return syscall(SYS_semtimedop, id, ops, op_count, ts);
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#else
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return syscall(SYS_ipc, SEMTIMEDOP, id, op_count, 0, ops, ts);
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#endif
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}
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/* Make alias for use with e.g. dlopen() */
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#undef semctl
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int semctl(int id, int num, int cmd, ...) __attribute__((alias("libandroid_semctl")));
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#undef semget
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int semget(key_t key, int n, int flags) __attribute__((alias("libandroid_semget")));
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#undef semop
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int semop(int id, struct sembuf* ops, size_t op_count) __attribute__((alias("libandroid_semop")));
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#undef semtimedop
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int semtimedop(int id, struct sembuf* ops, size_t op_count, const struct timespec* ts) __attribute__((alias("libandroid_semtimedop")));
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