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/* Tests of readlink.
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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 <ebb9@byu.net>, 2009. */
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/* This file is designed to test both readlink(a,b,c) and
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readlinkat(AT_FDCWD,a,b,c). FUNC is the function to test. Assumes
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that BASE and ASSERT are already defined, and that appropriate
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headers are already included. If PRINT, warn before skipping
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symlink tests with status 77. */
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static int
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test_readlink (ssize_t (*func) (char const *, char *, size_t), bool print)
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{
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char buf[80];
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/* Sanity checks of failures. Mingw lacks symlink, but readlink can
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still distinguish between various errors. */
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memset (buf, 0xff, sizeof buf);
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errno = 0;
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ASSERT (func ("no_such", buf, sizeof buf) == -1);
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ASSERT (errno == ENOENT);
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errno = 0;
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ASSERT (func ("no_such/", buf, sizeof buf) == -1);
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ASSERT (errno == ENOENT);
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errno = 0;
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ASSERT (func ("", buf, sizeof buf) == -1);
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ASSERT (errno == ENOENT || errno == EINVAL);
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errno = 0;
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ASSERT (func (".", buf, sizeof buf) == -1);
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ASSERT (errno == EINVAL);
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errno = 0;
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ASSERT (func ("./", buf, sizeof buf) == -1);
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ASSERT (errno == EINVAL);
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ASSERT (close (creat (BASE "file", 0600)) == 0);
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errno = 0;
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ASSERT (func (BASE "file", buf, sizeof buf) == -1);
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ASSERT (errno == EINVAL);
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errno = 0;
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ASSERT (func (BASE "file/", buf, sizeof buf) == -1);
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ASSERT (errno == ENOTDIR || errno == EINVAL); /* AIX yields EINVAL */
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/* Now test actual symlinks. */
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if (symlink (BASE "dir", BASE "link"))
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{
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ASSERT (unlink (BASE "file") == 0);
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if (print)
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fputs ("skipping test: symlinks not supported on this file system\n",
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stderr);
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return 77;
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}
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ASSERT (mkdir (BASE "dir", 0700) == 0);
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errno = 0;
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ASSERT (func (BASE "link/", buf, sizeof buf) == -1);
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ASSERT (errno == EINVAL);
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ASSERT (symlink (BASE "link", BASE "link2") == 0);
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errno = 0;
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ASSERT (func (BASE "link2/", buf, sizeof buf) == -1);
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ASSERT (errno == EINVAL);
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ASSERT (unlink (BASE "link2") == 0);
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ASSERT (symlink (BASE "file", BASE "link2") == 0);
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errno = 0;
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ASSERT (func (BASE "link2/", buf, sizeof buf) == -1);
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ASSERT (errno == ENOTDIR || errno == EINVAL); /* AIX yields EINVAL */
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ASSERT (unlink (BASE "file") == 0);
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ASSERT (unlink (BASE "link2") == 0);
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{
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/* Up till now, no readlink has been successful, so buf should be
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unchanged. */
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int i;
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for (i = 0; i < sizeof buf; i++)
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ASSERT (buf[i] == (char) 0xff);
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}
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{
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size_t len = strlen (BASE "dir");
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/* When passing too small of a buffer, expect the truncated
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length, or an ERANGE failure. However, a size of 0 is not
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portable enough to test. */
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ssize_t result;
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errno = 0;
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result = readlink (BASE "link", buf, 1);
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if (result == -1)
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{
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ASSERT (errno == ERANGE);
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ASSERT (buf[0] == (char) 0xff);
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}
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else
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{
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ASSERT (result == 1);
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ASSERT (buf[0] == BASE[0]);
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}
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ASSERT (buf[1] == (char) 0xff);
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ASSERT (func (BASE "link", buf, len) == len);
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ASSERT (strncmp (buf, BASE "dir", len) == 0);
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ASSERT (buf[len] == (char) 0xff);
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ASSERT (func (BASE "link", buf, sizeof buf) == len);
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ASSERT (strncmp (buf, BASE "dir", len) == 0);
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/* POSIX says rest of buf is unspecified; but in practice, it is
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either left alone, or NUL-terminated. */
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ASSERT (buf[len] == '\0' || buf[len] == (char) 0xff);
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}
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ASSERT (rmdir (BASE "dir") == 0);
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ASSERT (unlink (BASE "link") == 0);
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return 0;
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}
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