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/msg.h> 30 31 #include <sys/syscall.h> 32 #include <unistd.h> 33 34 int msgctl(int id, int cmd, msqid_ds* buf) { 35 #if !defined(__LP64__) || defined(__mips__) 36 // Annoyingly, the kernel requires this for 32-bit but rejects it for 64-bit. 37 // Mips64 is an exception to this, it requires the flag. 38 cmd |= IPC_64; 39 #endif 40 #if defined(SYS_msgctl) 41 return syscall(SYS_msgctl, id, cmd, buf); 42 #else 43 return syscall(SYS_ipc, MSGCTL, id, cmd, 0, buf, 0); 44 #endif 45 } 46 47 int msgget(key_t key, int flags) { 48 #if defined(SYS_msgget) 49 return syscall(SYS_msgget, key, flags); 50 #else 51 return syscall(SYS_ipc, MSGGET, key, flags, 0, 0, 0); 52 #endif 53 } 54 55 ssize_t msgrcv(int id, void* msg, size_t n, long type, int flags) { 56 #if defined(SYS_msgrcv) 57 return syscall(SYS_msgrcv, id, msg, n, type, flags); 58 #else 59 return syscall(SYS_ipc, IPCCALL(1, MSGRCV), id, n, flags, msg, type); 60 #endif 61 } 62 63 int msgsnd(int id, const void* msg, size_t n, int flags) { 64 #if defined(SYS_msgsnd) 65 return syscall(SYS_msgsnd, id, msg, n, flags); 66 #else 67 return syscall(SYS_ipc, MSGSND, id, n, flags, msg, 0); 68 #endif 69 } 70
