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 35 int 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 52 int 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 60 int semop(int id, sembuf* ops, size_t op_count) { 61 return semtimedop(id, ops, op_count, nullptr); 62 } 63 64 int 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
