1/* provide a replacement openat function 2 Copyright (C) 2004, 2005, 2006 Free Software Foundation, Inc. 3 4 This program is free software; you can redistribute it and/or modify 5 it under the terms of the GNU General Public License as published by 6 the Free Software Foundation; either version 2, or (at your option) 7 any later version. 8 9 This program is distributed in the hope that it will be useful, 10 but WITHOUT ANY WARRANTY; without even the implied warranty of 11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 12 GNU General Public License for more details. 13 14 You should have received a copy of the GNU General Public License 15 along with this program; if not, write to the Free Software Foundation, 16 Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */ 17 18/* written by Jim Meyering */ 19 20#include <fcntl.h> 21 22#include <sys/types.h> 23#include <sys/stat.h> 24#include <dirent.h> 25#include <unistd.h> 26#include <stdbool.h> 27 28#ifndef __attribute__ 29# if __GNUC__ < 2 || (__GNUC__ == 2 && __GNUC_MINOR__ < 8) || __STRICT_ANSI__ 30# define __attribute__(x) /* empty */ 31# endif 32#endif 33 34#ifndef ATTRIBUTE_NORETURN 35# define ATTRIBUTE_NORETURN __attribute__ ((__noreturn__)) 36#endif 37 38/* Work around a bug in Solaris 9 and 10: AT_FDCWD is positive. Its 39 value exceeds INT_MAX, so its use as an int doesn't conform to the 40 C standard, and GCC and Sun C complain in some cases. If the bug 41 is present, undef AT_FDCWD here, so it can be redefined below. */ 42#if 0 < AT_FDCWD && AT_FDCWD == 0xffd19553 43# undef AT_FDCWD 44#endif 45 46/* Use the same bit pattern as Solaris 9, but with the proper 47 signedness. The bit pattern is important, in case this actually is 48 Solaris with the above workaround. */ 49#ifndef AT_FDCWD 50# define AT_FDCWD (-3041965) 51#endif 52 53/* Use the same values as Solaris 9. This shouldn't matter, but 54 there's no real reason to differ. */ 55#ifndef AT_SYMLINK_NOFOLLOW 56# define AT_SYMLINK_NOFOLLOW 4096 57# define AT_REMOVEDIR 1 58#endif 59 60#ifdef __OPENAT_PREFIX 61 62# undef openat 63# define __OPENAT_CONCAT(x, y) x ## y 64# define __OPENAT_XCONCAT(x, y) __OPENAT_CONCAT (x, y) 65# define __OPENAT_ID(y) __OPENAT_XCONCAT (__OPENAT_PREFIX, y) 66# define openat __OPENAT_ID (openat) 67int openat (int fd, char const *file, int flags, /* mode_t mode */ ...); 68int openat_permissive (int fd, char const *file, int flags, mode_t mode, 69 int *cwd_errno); 70# if ! HAVE_FDOPENDIR 71# define fdopendir __OPENAT_ID (fdopendir) 72# endif 73DIR *fdopendir (int fd); 74# define fstatat __OPENAT_ID (fstatat) 75int fstatat (int fd, char const *file, struct stat *st, int flag); 76# define unlinkat __OPENAT_ID (unlinkat) 77int unlinkat (int fd, char const *file, int flag); 78bool openat_needs_fchdir (void); 79 80#else 81 82# define openat_permissive(Fd, File, Flags, Mode, Cwd_errno) \ 83 openat (Fd, File, Flags, Mode) 84# define openat_needs_fchdir() false 85 86#endif 87 88#if HAVE_OPENAT && ! LSTAT_FOLLOWS_SLASHED_SYMLINK 89int rpl_fstatat (int fd, char const *file, struct stat *st, int flag); 90# if !COMPILING_FSTATAT 91# undef fstatat 92# define fstatat rpl_fstatat 93# endif 94#endif 95 96int mkdirat (int fd, char const *file, mode_t mode); 97void openat_restore_fail (int) ATTRIBUTE_NORETURN; 98void openat_save_fail (int) ATTRIBUTE_NORETURN; 99int fchmodat (int fd, char const *file, mode_t mode, int flag); 100int fchownat (int fd, char const *file, uid_t owner, gid_t group, int flag); 101 102/* Using these function names makes application code 103 slightly more readable than it would be with 104 fchownat (..., 0) or fchownat (..., AT_SYMLINK_NOFOLLOW). */ 105static inline int 106chownat (int fd, char const *file, uid_t owner, gid_t group) 107{ 108 return fchownat (fd, file, owner, group, 0); 109} 110 111static inline int 112lchownat (int fd, char const *file, uid_t owner, gid_t group) 113{ 114 return fchownat (fd, file, owner, group, AT_SYMLINK_NOFOLLOW); 115} 116 117static inline int 118chmodat (int fd, char const *file, mode_t mode) 119{ 120 return fchmodat (fd, file, mode, 0); 121} 122 123static inline int 124lchmodat (int fd, char const *file, mode_t mode) 125{ 126 return fchmodat (fd, file, mode, AT_SYMLINK_NOFOLLOW); 127} 128