1/* 2 * Copyright (C) 2008 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#undef _FORTIFY_SOURCE 30 31#include <errno.h> 32#include <fcntl.h> 33#include <stdarg.h> 34#include <sys/resource.h> 35#include <sys/types.h> 36#include <sys/vfs.h> 37#include <unistd.h> 38 39#if __LP64__ 40#error This code is only needed on 32-bit systems! 41#endif 42 43// System calls we need. 44extern "C" int __fcntl64(int, int, void*); 45extern "C" int __llseek(int, unsigned long, unsigned long, off64_t*, int); 46 47// For fcntl we use the fcntl64 system call to signal that we're using struct flock64. 48int fcntl(int fd, int cmd, ...) { 49 va_list ap; 50 51 va_start(ap, cmd); 52 void* arg = va_arg(ap, void*); 53 va_end(ap); 54 55 return __fcntl64(fd, cmd, arg); 56} 57 58// For lseek64 we need to use the llseek system call which splits the off64_t in two and 59// returns the off64_t result via a pointer because 32-bit kernels can't return 64-bit results. 60off64_t lseek64(int fd, off64_t off, int whence) { 61 off64_t result; 62 unsigned long off_hi = static_cast<unsigned long>(off >> 32); 63 unsigned long off_lo = static_cast<unsigned long>(off); 64 if (__llseek(fd, off_hi, off_lo, &result, whence) < 0) { 65 return -1; 66 } 67 return result; 68} 69 70// There is no pread for 32-bit off_t, so we need to widen and call pread64. 71ssize_t pread(int fd, void* buf, size_t byte_count, off_t offset) { 72 return pread64(fd, buf, byte_count, static_cast<off64_t>(offset)); 73} 74 75// There is no pwrite for 32-bit off_t, so we need to widen and call pwrite64. 76ssize_t pwrite(int fd, const void* buf, size_t byte_count, off_t offset) { 77 return pwrite64(fd, buf, byte_count, static_cast<off64_t>(offset)); 78} 79 80// There is no fallocate for 32-bit off_t, so we need to widen and call fallocate64. 81int fallocate(int fd, int mode, off_t offset, off_t length) { 82 return fallocate64(fd, mode, static_cast<off64_t>(offset), static_cast<off64_t>(length)); 83} 84 85// There is no getrlimit64 system call, so we need to use prlimit64. 86int getrlimit64(int resource, rlimit64* limits64) { 87 return prlimit64(0, resource, NULL, limits64); 88} 89 90// There is no setrlimit64 system call, so we need to use prlimit64. 91int setrlimit64(int resource, const rlimit64* limits64) { 92 return prlimit64(0, resource, limits64, NULL); 93} 94