diff options
Diffstat (limited to 'cross/lib/at-func.c')
-rw-r--r-- | cross/lib/at-func.c | 146 |
1 files changed, 0 insertions, 146 deletions
diff --git a/cross/lib/at-func.c b/cross/lib/at-func.c deleted file mode 100644 index 13e3fb32056..00000000000 --- a/cross/lib/at-func.c +++ /dev/null @@ -1,146 +0,0 @@ -/* Define at-style functions like fstatat, unlinkat, fchownat, etc. - Copyright (C) 2006, 2009-2023 Free Software Foundation, Inc. - - This program is free software: you can redistribute it and/or modify - it under the terms of the GNU General Public License as published by - the Free Software Foundation, either version 3 of the License, or - (at your option) any later version. - - This program is distributed in the hope that it will be useful, - but WITHOUT ANY WARRANTY; without even the implied warranty of - MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - GNU General Public License for more details. - - You should have received a copy of the GNU General Public License - along with this program. If not, see <https://www.gnu.org/licenses/>. */ - -/* written by Jim Meyering */ - -#include "filename.h" /* solely for definition of IS_ABSOLUTE_FILE_NAME */ - -#ifdef GNULIB_SUPPORT_ONLY_AT_FDCWD -# include <errno.h> -# ifndef ENOTSUP -# define ENOTSUP EINVAL -# endif -#else -# include "openat.h" -# include "openat-priv.h" -# include "save-cwd.h" -#endif - -#ifdef AT_FUNC_USE_F1_COND -# define CALL_FUNC(F) \ - (flag == AT_FUNC_USE_F1_COND \ - ? AT_FUNC_F1 (F AT_FUNC_POST_FILE_ARGS) \ - : AT_FUNC_F2 (F AT_FUNC_POST_FILE_ARGS)) -# define VALIDATE_FLAG(F) \ - if (flag & ~AT_FUNC_USE_F1_COND) \ - { \ - errno = EINVAL; \ - return FUNC_FAIL; \ - } -#else -# define CALL_FUNC(F) (AT_FUNC_F1 (F AT_FUNC_POST_FILE_ARGS)) -# define VALIDATE_FLAG(F) /* empty */ -#endif - -#ifdef AT_FUNC_RESULT -# define FUNC_RESULT AT_FUNC_RESULT -#else -# define FUNC_RESULT int -#endif - -#ifdef AT_FUNC_FAIL -# define FUNC_FAIL AT_FUNC_FAIL -#else -# define FUNC_FAIL -1 -#endif - -/* Call AT_FUNC_F1 to operate on FILE, which is in the directory - open on descriptor FD. If AT_FUNC_USE_F1_COND is defined to a value, - AT_FUNC_POST_FILE_PARAM_DECLS must include a parameter named flag; - call AT_FUNC_F2 if FLAG is 0 or fail if FLAG contains more bits than - AT_FUNC_USE_F1_COND. Return int and fail with -1 unless AT_FUNC_RESULT - or AT_FUNC_FAIL are defined. If possible, do it without changing the - working directory. Otherwise, resort to using save_cwd/fchdir, - then AT_FUNC_F?/restore_cwd. If either the save_cwd or the restore_cwd - fails, then give a diagnostic and exit nonzero. */ -FUNC_RESULT -AT_FUNC_NAME (int fd, char const *file AT_FUNC_POST_FILE_PARAM_DECLS) -{ - VALIDATE_FLAG (flag); - - if (fd == AT_FDCWD || IS_ABSOLUTE_FILE_NAME (file)) - return CALL_FUNC (file); - -#ifdef GNULIB_SUPPORT_ONLY_AT_FDCWD - errno = ENOTSUP; - return FUNC_FAIL; -#else - { - /* Be careful to choose names unlikely to conflict with - AT_FUNC_POST_FILE_PARAM_DECLS. */ - struct saved_cwd saved_cwd; - int saved_errno; - FUNC_RESULT err; - - { - char proc_buf[OPENAT_BUFFER_SIZE]; - char *proc_file = openat_proc_name (proc_buf, fd, file); - if (proc_file) - { - FUNC_RESULT proc_result = CALL_FUNC (proc_file); - int proc_errno = errno; - if (proc_file != proc_buf) - free (proc_file); - /* If the syscall succeeds, or if it fails with an unexpected - errno value, then return right away. Otherwise, fall through - and resort to using save_cwd/restore_cwd. */ - if (FUNC_FAIL != proc_result) - return proc_result; - if (! EXPECTED_ERRNO (proc_errno)) - { - errno = proc_errno; - return proc_result; - } - } - } - - if (save_cwd (&saved_cwd) != 0) - openat_save_fail (errno); - if (0 <= fd && fd == saved_cwd.desc) - { - /* If saving the working directory collides with the user's - requested fd, then the user's fd must have been closed to - begin with. */ - free_cwd (&saved_cwd); - errno = EBADF; - return FUNC_FAIL; - } - - if (fchdir (fd) != 0) - { - saved_errno = errno; - free_cwd (&saved_cwd); - errno = saved_errno; - return FUNC_FAIL; - } - - err = CALL_FUNC (file); - saved_errno = (err == FUNC_FAIL ? errno : 0); - - if (restore_cwd (&saved_cwd) != 0) - openat_restore_fail (errno); - - free_cwd (&saved_cwd); - - if (saved_errno) - errno = saved_errno; - return err; - } -#endif -} -#undef CALL_FUNC -#undef FUNC_RESULT -#undef FUNC_FAIL |