1 /* 2 * Copyright (C) 2015 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/stat.h> 30 #include <sys/types.h> 31 #include <sys/syscall.h> 32 #include <unistd.h> 33 34 struct kernel_stat { 35 unsigned int st_dev; 36 unsigned int st_pad0[3]; 37 unsigned long st_ino; 38 mode_t st_mode; 39 __u32 st_nlink; 40 uid_t st_uid; 41 gid_t st_gid; 42 unsigned int st_rdev; 43 unsigned int st_pad1[3]; 44 __kernel_off_t st_size; 45 unsigned int _st_atime; 46 unsigned int _st_atime_nsec; 47 unsigned int _st_mtime; 48 unsigned int _st_mtime_nsec; 49 unsigned int _st_ctime; 50 unsigned int _st_ctime_nsec; 51 unsigned int st_blksize; 52 unsigned int st_pad2; 53 unsigned long st_blocks; 54 }; 55 56 static void copy_stat(struct stat* st, struct kernel_stat* s) { 57 st->st_dev = static_cast<dev_t>(s->st_dev); 58 st->st_ino = static_cast<ino_t>(s->st_ino); 59 st->st_mode = static_cast<mode_t>(s->st_mode); 60 st->st_nlink = static_cast<nlink_t>(s->st_nlink); 61 st->st_uid = static_cast<uid_t>(s->st_uid); 62 st->st_gid = static_cast<gid_t>(s->st_gid); 63 st->st_rdev = static_cast<dev_t>(s->st_rdev); 64 st->st_size = static_cast<off_t>(s->st_size); 65 st->st_blksize = static_cast<int>(s->st_blksize); 66 st->st_blocks = static_cast<long>(s->st_blocks); 67 st->st_atim.tv_sec = static_cast<time_t>(s->_st_atime); 68 st->st_atim.tv_nsec = static_cast<long>(s->_st_atime_nsec); 69 st->st_mtim.tv_sec = static_cast<time_t>(s->_st_mtime); 70 st->st_mtim.tv_nsec = static_cast<long>(s->_st_mtime_nsec); 71 st->st_ctim.tv_sec = static_cast<time_t>(s->_st_ctime); 72 st->st_ctim.tv_nsec = static_cast<long>(s->_st_ctime_nsec); 73 } 74 75 int fstat(int fp, struct stat* st) { 76 kernel_stat s; 77 int ret = syscall(__NR_fstat, fp, &s); 78 copy_stat(st, &s); 79 return ret; 80 } 81 __strong_alias(fstat64, fstat); 82 83 int fstatat(int dirfd, const char* pathname, struct stat* buf, int flags) { 84 kernel_stat s; 85 int ret = syscall(__NR_newfstatat, dirfd, pathname, &s, flags); 86 copy_stat(buf, &s); 87 return ret; 88 } 89 __strong_alias(fstatat64, fstatat); 90
