1/* provide a replacement openat function 2 Copyright (C) 2004-2006, 2008-2010 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 3 of the License, or 7 (at your option) 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, see <http://www.gnu.org/licenses/>. */ 16 17/* written by Jim Meyering */ 18 19#ifndef _GL_HEADER_OPENAT 20#define _GL_HEADER_OPENAT 21 22#include <fcntl.h> 23 24#include <sys/types.h> 25#include <sys/stat.h> 26#include <dirent.h> 27#include <unistd.h> 28#include <stdbool.h> 29 30#ifndef __attribute__ 31# if __GNUC__ < 2 || (__GNUC__ == 2 && __GNUC_MINOR__ < 8) 32# define __attribute__(x) /* empty */ 33# endif 34#endif 35 36#ifndef ATTRIBUTE_NORETURN 37# define ATTRIBUTE_NORETURN __attribute__ ((__noreturn__)) 38#endif 39 40#if !HAVE_OPENAT 41 42int openat_permissive (int fd, char const *file, int flags, mode_t mode, 43 int *cwd_errno); 44bool openat_needs_fchdir (void); 45 46#else 47 48# define openat_permissive(Fd, File, Flags, Mode, Cwd_errno) \ 49 openat (Fd, File, Flags, Mode) 50# define openat_needs_fchdir() false 51 52#endif 53 54void openat_restore_fail (int) ATTRIBUTE_NORETURN; 55void openat_save_fail (int) ATTRIBUTE_NORETURN; 56 57/* Using these function names makes application code 58 slightly more readable than it would be with 59 fchownat (..., 0) or fchownat (..., AT_SYMLINK_NOFOLLOW). */ 60static inline int 61chownat (int fd, char const *file, uid_t owner, gid_t group) 62{ 63 return fchownat (fd, file, owner, group, 0); 64} 65 66static inline int 67lchownat (int fd, char const *file, uid_t owner, gid_t group) 68{ 69 return fchownat (fd, file, owner, group, AT_SYMLINK_NOFOLLOW); 70} 71 72static inline int 73chmodat (int fd, char const *file, mode_t mode) 74{ 75 return fchmodat (fd, file, mode, 0); 76} 77 78static inline int 79lchmodat (int fd, char const *file, mode_t mode) 80{ 81 return fchmodat (fd, file, mode, AT_SYMLINK_NOFOLLOW); 82} 83 84static inline int 85statat (int fd, char const *name, struct stat *st) 86{ 87 return fstatat (fd, name, st, 0); 88} 89 90static inline int 91lstatat (int fd, char const *name, struct stat *st) 92{ 93 return fstatat (fd, name, st, AT_SYMLINK_NOFOLLOW); 94} 95 96#if GNULIB_FACCESSAT 97/* For now, there are no wrappers named laccessat or leuidaccessat, 98 since gnulib doesn't support faccessat(,AT_SYMLINK_NOFOLLOW) and 99 since access rights on symlinks are of limited utility. */ 100 101static inline int 102accessat (int fd, char const *file, int mode) 103{ 104 return faccessat (fd, file, mode, 0); 105} 106 107static inline int 108euidaccessat (int fd, char const *file, int mode) 109{ 110 return faccessat (fd, file, mode, AT_EACCESS); 111} 112#endif 113 114#endif /* _GL_HEADER_OPENAT */ 115