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 #include <fcntl.h> 30 #include <stdarg.h> 31 #include <stdlib.h> 32 #include <unistd.h> 33 34 #include "private/bionic_fortify.h" 35 36 extern "C" int __openat(int, const char*, int, int); 37 38 static inline int force_O_LARGEFILE(int flags) { 39 #if defined(__LP64__) 40 return flags; // No need, and aarch64's strace gets confused. 41 #else 42 return flags | O_LARGEFILE; 43 #endif 44 } 45 46 static inline bool needs_mode(int flags) { 47 return ((flags & O_CREAT) == O_CREAT) || ((flags & O_TMPFILE) == O_TMPFILE); 48 } 49 50 int creat(const char* pathname, mode_t mode) { 51 return open(pathname, O_CREAT | O_TRUNC | O_WRONLY, mode); 52 } 53 __strong_alias(creat64, creat); 54 55 int open(const char* pathname, int flags, ...) { 56 mode_t mode = 0; 57 58 if (needs_mode(flags)) { 59 va_list args; 60 va_start(args, flags); 61 mode = static_cast<mode_t>(va_arg(args, int)); 62 va_end(args); 63 } 64 65 return __openat(AT_FDCWD, pathname, force_O_LARGEFILE(flags), mode); 66 } 67 __strong_alias(open64, open); 68 69 int __open_2(const char* pathname, int flags) { 70 if (needs_mode(flags)) __fortify_fatal("open: called with O_CREAT/O_TMPFILE but no mode"); 71 return __openat(AT_FDCWD, pathname, force_O_LARGEFILE(flags), 0); 72 } 73 74 int openat(int fd, const char *pathname, int flags, ...) { 75 mode_t mode = 0; 76 77 if (needs_mode(flags)) { 78 va_list args; 79 va_start(args, flags); 80 mode = static_cast<mode_t>(va_arg(args, int)); 81 va_end(args); 82 } 83 84 return __openat(fd, pathname, force_O_LARGEFILE(flags), mode); 85 } 86 __strong_alias(openat64, openat); 87 88 int __openat_2(int fd, const char* pathname, int flags) { 89 if (needs_mode(flags)) __fortify_fatal("open: called with O_CREAT/O_TMPFILE but no mode"); 90 return __openat(fd, pathname, force_O_LARGEFILE(flags), 0); 91 } 92
