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/* Tests of readlinkat.
Copyright (C) 2009-2022 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. */
#include <config.h>
#include <unistd.h>
#include "signature.h"
SIGNATURE_CHECK (readlinkat, ssize_t, (int, char const *, char *, size_t));
#include <fcntl.h>
#include <errno.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
#include "ignore-value.h"
#include "macros.h"
#ifndef HAVE_SYMLINK
# define HAVE_SYMLINK 0
#endif
#define BASE "test-readlinkat.t"
#include "test-readlink.h"
static int dfd = AT_FDCWD;
static ssize_t
do_readlink (char const *name, char *buf, size_t len)
{
return readlinkat (dfd, name, buf, len);
}
int
main (void)
{
char buf[80];
int result;
/* Remove any leftovers from a previous partial run. */
ignore_value (system ("rm -rf " BASE "*"));
/* Test behaviour for invalid file descriptors. */
{
errno = 0;
ASSERT (readlinkat (-1, "foo", buf, sizeof buf) == -1);
ASSERT (errno == EBADF);
}
{
close (99);
errno = 0;
ASSERT (readlinkat (99, "foo", buf, sizeof buf) == -1);
ASSERT (errno == EBADF);
}
/* Perform same checks as counterpart functions. */
result = test_readlink (do_readlink, false);
dfd = openat (AT_FDCWD, ".", O_RDONLY);
ASSERT (0 <= dfd);
ASSERT (test_readlink (do_readlink, false) == result);
/* Now perform some cross-directory checks. Skip everything else on
mingw. */
if (HAVE_SYMLINK)
{
const char *contents = "don't matter!";
ssize_t exp = strlen (contents);
/* Create link while cwd is '.', then read it in '..'. */
ASSERT (symlinkat (contents, AT_FDCWD, BASE "link") == 0);
errno = 0;
ASSERT (symlinkat (contents, dfd, BASE "link") == -1);
ASSERT (errno == EEXIST);
ASSERT (chdir ("..") == 0);
errno = 0;
ASSERT (readlinkat (AT_FDCWD, BASE "link", buf, sizeof buf) == -1);
ASSERT (errno == ENOENT);
ASSERT (readlinkat (dfd, BASE "link", buf, sizeof buf) == exp);
ASSERT (strncmp (contents, buf, exp) == 0);
ASSERT (unlinkat (dfd, BASE "link", 0) == 0);
/* Create link while cwd is '..', then read it in '.'. */
ASSERT (symlinkat (contents, dfd, BASE "link") == 0);
ASSERT (fchdir (dfd) == 0);
errno = 0;
ASSERT (symlinkat (contents, AT_FDCWD, BASE "link") == -1);
ASSERT (errno == EEXIST);
buf[0] = '\0';
ASSERT (readlinkat (AT_FDCWD, BASE "link", buf, sizeof buf) == exp);
ASSERT (strncmp (contents, buf, exp) == 0);
buf[0] = '\0';
ASSERT (readlinkat (dfd, BASE "link", buf, sizeof buf) == exp);
ASSERT (strncmp (contents, buf, exp) == 0);
ASSERT (unlink (BASE "link") == 0);
}
ASSERT (close (dfd) == 0);
if (result == 77)
fputs ("skipping test: symlinks not supported on this file system\n",
stderr);
return result;
}
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