| /* Tests of readlink. |
| Copyright (C) 2009-2020 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 Eric Blake <ebb9@byu.net>, 2009. */ |
| |
| /* This file is designed to test both readlink(a,b,c) and |
| readlinkat(AT_FDCWD,a,b,c). FUNC is the function to test. Assumes |
| that BASE and ASSERT are already defined, and that appropriate |
| headers are already included. If PRINT, warn before skipping |
| symlink tests with status 77. */ |
| |
| static int |
| test_readlink (ssize_t (*func) (char const *, char *, size_t), bool print) |
| { |
| char buf[80]; |
| |
| /* Sanity checks of failures. Mingw lacks symlink, but readlink can |
| still distinguish between various errors. */ |
| memset (buf, 0xff, sizeof buf); |
| errno = 0; |
| ASSERT (func ("no_such", buf, sizeof buf) == -1); |
| ASSERT (errno == ENOENT); |
| errno = 0; |
| ASSERT (func ("no_such/", buf, sizeof buf) == -1); |
| ASSERT (errno == ENOENT); |
| errno = 0; |
| ASSERT (func ("", buf, sizeof buf) == -1); |
| ASSERT (errno == ENOENT || errno == EINVAL); |
| errno = 0; |
| ASSERT (func (".", buf, sizeof buf) == -1); |
| ASSERT (errno == EINVAL); |
| errno = 0; |
| ASSERT (func ("./", buf, sizeof buf) == -1); |
| ASSERT (errno == EINVAL); |
| ASSERT (close (creat (BASE "file", 0600)) == 0); |
| errno = 0; |
| ASSERT (func (BASE "file", buf, sizeof buf) == -1); |
| ASSERT (errno == EINVAL); |
| errno = 0; |
| ASSERT (func (BASE "file/", buf, sizeof buf) == -1); |
| ASSERT (errno == ENOTDIR || errno == EINVAL); /* AIX yields EINVAL */ |
| |
| /* Now test actual symlinks. */ |
| if (symlink (BASE "dir", BASE "link")) |
| { |
| ASSERT (unlink (BASE "file") == 0); |
| if (print) |
| fputs ("skipping test: symlinks not supported on this file system\n", |
| stderr); |
| return 77; |
| } |
| ASSERT (mkdir (BASE "dir", 0700) == 0); |
| errno = 0; |
| ASSERT (func (BASE "link/", buf, sizeof buf) == -1); |
| ASSERT (errno == EINVAL); |
| ASSERT (symlink (BASE "link", BASE "link2") == 0); |
| errno = 0; |
| ASSERT (func (BASE "link2/", buf, sizeof buf) == -1); |
| ASSERT (errno == EINVAL); |
| ASSERT (unlink (BASE "link2") == 0); |
| ASSERT (symlink (BASE "file", BASE "link2") == 0); |
| errno = 0; |
| ASSERT (func (BASE "link2/", buf, sizeof buf) == -1); |
| ASSERT (errno == ENOTDIR || errno == EINVAL); /* AIX yields EINVAL */ |
| ASSERT (unlink (BASE "file") == 0); |
| ASSERT (unlink (BASE "link2") == 0); |
| { |
| /* Up till now, no readlink has been successful, so buf should be |
| unchanged. */ |
| int i; |
| for (i = 0; i < sizeof buf; i++) |
| ASSERT (buf[i] == (char) 0xff); |
| } |
| { |
| size_t len = strlen (BASE "dir"); |
| /* When passing too small of a buffer, expect the truncated |
| length, or an ERANGE failure. However, a size of 0 is not |
| portable enough to test. */ |
| ssize_t result; |
| errno = 0; |
| result = readlink (BASE "link", buf, 1); |
| if (result == -1) |
| { |
| ASSERT (errno == ERANGE); |
| ASSERT (buf[0] == (char) 0xff); |
| } |
| else |
| { |
| ASSERT (result == 1); |
| ASSERT (buf[0] == BASE[0]); |
| } |
| ASSERT (buf[1] == (char) 0xff); |
| ASSERT (func (BASE "link", buf, len) == len); |
| ASSERT (strncmp (buf, BASE "dir", len) == 0); |
| ASSERT (buf[len] == (char) 0xff); |
| ASSERT (func (BASE "link", buf, sizeof buf) == len); |
| ASSERT (strncmp (buf, BASE "dir", len) == 0); |
| /* POSIX says rest of buf is unspecified; but in practice, it is |
| either left alone, or NUL-terminated. */ |
| ASSERT (buf[len] == '\0' || buf[len] == (char) 0xff); |
| } |
| ASSERT (rmdir (BASE "dir") == 0); |
| ASSERT (unlink (BASE "link") == 0); |
| |
| return 0; |
| } |