| 1 | /* provide a replacement openat function |
| 2 | Copyright (C) 2004-2006, 2008-2019 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 <https://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 <unistd.h> |
| 27 | #include <stdbool.h> |
| 28 | |
| 29 | #ifndef _GL_INLINE_HEADER_BEGIN |
| 30 | #error "Please include config.h first." |
| 31 | #endif |
| 32 | _GL_INLINE_HEADER_BEGIN |
| 33 | |
| 34 | #if !HAVE_OPENAT |
| 35 | |
| 36 | int openat_permissive (int fd, char const *file, int flags, mode_t mode, |
| 37 | int *cwd_errno); |
| 38 | bool openat_needs_fchdir (void); |
| 39 | |
| 40 | #else |
| 41 | |
| 42 | # define openat_permissive(Fd, File, Flags, Mode, Cwd_errno) \ |
| 43 | openat (Fd, File, Flags, Mode) |
| 44 | # define openat_needs_fchdir() false |
| 45 | |
| 46 | #endif |
| 47 | |
| 48 | _Noreturn void openat_restore_fail (int); |
| 49 | _Noreturn void openat_save_fail (int); |
| 50 | |
| 51 | /* Using these function names makes application code |
| 52 | slightly more readable than it would be with |
| 53 | fchownat (..., 0) or fchownat (..., AT_SYMLINK_NOFOLLOW). */ |
| 54 | |
| 55 | #if GNULIB_FCHOWNAT |
| 56 | |
| 57 | # ifndef FCHOWNAT_INLINE |
| 58 | # define FCHOWNAT_INLINE _GL_INLINE |
| 59 | # endif |
| 60 | |
| 61 | FCHOWNAT_INLINE int |
| 62 | chownat (int fd, char const *file, uid_t owner, gid_t group) |
| 63 | { |
| 64 | return fchownat (fd, file, owner, group, 0); |
| 65 | } |
| 66 | |
| 67 | FCHOWNAT_INLINE int |
| 68 | lchownat (int fd, char const *file, uid_t owner, gid_t group) |
| 69 | { |
| 70 | return fchownat (fd, file, owner, group, AT_SYMLINK_NOFOLLOW); |
| 71 | } |
| 72 | |
| 73 | #endif |
| 74 | |
| 75 | #if GNULIB_FCHMODAT |
| 76 | |
| 77 | # ifndef FCHMODAT_INLINE |
| 78 | # define FCHMODAT_INLINE _GL_INLINE |
| 79 | # endif |
| 80 | |
| 81 | FCHMODAT_INLINE int |
| 82 | chmodat (int fd, char const *file, mode_t mode) |
| 83 | { |
| 84 | return fchmodat (fd, file, mode, 0); |
| 85 | } |
| 86 | |
| 87 | FCHMODAT_INLINE int |
| 88 | lchmodat (int fd, char const *file, mode_t mode) |
| 89 | { |
| 90 | return fchmodat (fd, file, mode, AT_SYMLINK_NOFOLLOW); |
| 91 | } |
| 92 | |
| 93 | #endif |
| 94 | |
| 95 | #if GNULIB_STATAT |
| 96 | |
| 97 | # ifndef STATAT_INLINE |
| 98 | # define STATAT_INLINE _GL_INLINE |
| 99 | # endif |
| 100 | |
| 101 | STATAT_INLINE int |
| 102 | statat (int fd, char const *name, struct stat *st) |
| 103 | { |
| 104 | return fstatat (fd, name, st, 0); |
| 105 | } |
| 106 | |
| 107 | STATAT_INLINE int |
| 108 | lstatat (int fd, char const *name, struct stat *st) |
| 109 | { |
| 110 | return fstatat (fd, name, st, AT_SYMLINK_NOFOLLOW); |
| 111 | } |
| 112 | |
| 113 | #endif |
| 114 | |
| 115 | /* For now, there are no wrappers named laccessat or leuidaccessat, |
| 116 | since gnulib doesn't support faccessat(,AT_SYMLINK_NOFOLLOW) and |
| 117 | since access rights on symlinks are of limited utility. Likewise, |
| 118 | wrappers are not provided for accessat or euidaccessat, so as to |
| 119 | avoid dragging in -lgen on some platforms. */ |
| 120 | |
| 121 | _GL_INLINE_HEADER_END |
| 122 | |
| 123 | #endif /* _GL_HEADER_OPENAT */ |