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46 lines
1.7 KiB
C
46 lines
1.7 KiB
C
/* Check the access rights of a file relative to an open directory.
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Copyright (C) 2009-2017 Free Software Foundation, Inc.
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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/* written by Eric Blake */
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#include <config.h>
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#include <unistd.h>
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#include <fcntl.h>
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#ifndef HAVE_ACCESS
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/* Mingw lacks access, but it also lacks real vs. effective ids, so
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the gnulib euidaccess module is good enough. */
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# undef access
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# define access euidaccess
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#endif
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/* Invoke access or euidaccess on file, FILE, using mode MODE, in the directory
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open on descriptor FD. If possible, do it without changing the
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working directory. Otherwise, resort to using save_cwd/fchdir, then
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(access|euidaccess)/restore_cwd. If either the save_cwd or the
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restore_cwd fails, then give a diagnostic and exit nonzero.
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Note that this implementation only supports AT_EACCESS, although some
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native versions also support AT_SYMLINK_NOFOLLOW. */
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#define AT_FUNC_NAME faccessat
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#define AT_FUNC_F1 euidaccess
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#define AT_FUNC_F2 access
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#define AT_FUNC_USE_F1_COND AT_EACCESS
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#define AT_FUNC_POST_FILE_PARAM_DECLS , int mode, int flag
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#define AT_FUNC_POST_FILE_ARGS , mode
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#include "at-func.c"
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