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renameat2: new module

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Although the Linux syscall renameat2 is not in glibc (yet?), it is
useful to have access to its RENAME_NOREPLACE flag.
* MODULES.html.sh (func_all_modules): Add renameat2.
* lib/renameat2.c, lib/renameat2.h, modules/renameat2:
* modules/renameat2-tests, tests/test-renameat2.c: New files.
* lib/renameat.c (renameat): Move most of the implementation
to renameat2, and just call renameat2.
* modules/renameat (Files): Remove lib/at-func2.c.
(Depends-on): Depend only on renameat2.
(Include): Remove <fcntl.h>.
* modules/renameat-tests (test_renameat_LDADD): Add $(LIB_EACCESS),
since renameat (via renameat2) might use faccessat.
This commit is contained in:
Paul Eggert
2017-07-27 12:08:39 -07:00
parent e97dce1b84
commit ec046e6685
10 changed files with 530 additions and 153 deletions
Download Patch File Download Diff File Expand all files Collapse all files
ChangeLog
+16
View File
@@ -1,3 +1,19 @@
2017-07-27 Paul Eggert <eggert@cs.ucla.edu>
renameat2: new module
Although the Linux syscall renameat2 is not in glibc (yet?), it is
useful to have access to its RENAME_NOREPLACE flag.
* MODULES.html.sh (func_all_modules): Add renameat2.
* lib/renameat2.c, lib/renameat2.h, modules/renameat2:
* modules/renameat2-tests, tests/test-renameat2.c: New files.
* lib/renameat.c (renameat): Move most of the implementation
to renameat2, and just call renameat2.
* modules/renameat (Files): Remove lib/at-func2.c.
(Depends-on): Depend only on renameat2.
(Include): Remove <fcntl.h>.
* modules/renameat-tests (test_renameat_LDADD): Add $(LIB_EACCESS),
since renameat (via renameat2) might use faccessat.
2017-07-27 Erik Skultety <eskultet@redhat.com> (tiny change)
vc-list-files: Adjust the script to support git worktrees
MODULES.html.sh
+1
View File
@@ -2677,6 +2677,7 @@ func_all_modules ()
func_module qset-acl
func_module read-file
func_module readlinkat
func_module renameat2
func_module same
func_module save-cwd
func_module savedir
lib/renameat.c
+4 -136
View File
@@ -1,5 +1,5 @@
/* Rename a file relative to open directories.
Copyright (C) 2009-2017 Free Software Foundation, Inc.
Copyright 2017 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
@@ -14,144 +14,12 @@
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>. */
/* written by Eric Blake */
#include <config.h>
#include <stdio.h>
#if HAVE_RENAMEAT
# include <errno.h>
# include <stdbool.h>
# include <stdlib.h>
# include <string.h>
# include <sys/stat.h>
# include "dirname.h"
# include "openat.h"
# undef renameat
/* renameat does not honor trailing / on Solaris 10. Solve it in a
similar manner to rename. No need to worry about bugs not present
on Solaris, since all other systems either lack renameat or honor
trailing slash correctly. */
#include "renameat2.h"
int
rpl_renameat (int fd1, char const *src, int fd2, char const *dst)
renameat (int fd1, char const *src, int fd2, char const *dst)
{
size_t src_len = strlen (src);
size_t dst_len = strlen (dst);
char *src_temp = (char *) src;
char *dst_temp = (char *) dst;
bool src_slash;
bool dst_slash;
int ret_val = -1;
int rename_errno = ENOTDIR;
struct stat src_st;
struct stat dst_st;
/* Let strace see any ENOENT failure. */
if (!src_len || !dst_len)
return renameat (fd1, src, fd2, dst);
src_slash = src[src_len - 1] == '/';
dst_slash = dst[dst_len - 1] == '/';
if (!src_slash && !dst_slash)
return renameat (fd1, src, fd2, dst);
/* Presence of a trailing slash requires directory semantics. If
the source does not exist, or if the destination cannot be turned
into a directory, give up now. Otherwise, strip trailing slashes
before calling rename. */
if (lstatat (fd1, src, &src_st))
return -1;
if (lstatat (fd2, dst, &dst_st))
{
if (errno != ENOENT || !S_ISDIR (src_st.st_mode))
return -1;
}
else if (!S_ISDIR (dst_st.st_mode))
{
errno = ENOTDIR;
return -1;
}
else if (!S_ISDIR (src_st.st_mode))
{
errno = EISDIR;
return -1;
}
# if RENAME_TRAILING_SLASH_SOURCE_BUG
/* See the lengthy comment in rename.c why Solaris 9 is forced to
GNU behavior, while Solaris 10 is left with POSIX behavior,
regarding symlinks with trailing slash. */
if (src_slash)
{
src_temp = strdup (src);
if (!src_temp)
{
/* Rather than rely on strdup-posix, we set errno ourselves. */
rename_errno = ENOMEM;
goto out;
}
strip_trailing_slashes (src_temp);
if (lstatat (fd1, src_temp, &src_st))
{
rename_errno = errno;
goto out;
}
if (S_ISLNK (src_st.st_mode))
goto out;
}
if (dst_slash)
{
dst_temp = strdup (dst);
if (!dst_temp)
{
rename_errno = ENOMEM;
goto out;
}
strip_trailing_slashes (dst_temp);
if (lstatat (fd2, dst_temp, &dst_st))
{
if (errno != ENOENT)
{
rename_errno = errno;
goto out;
}
}
else if (S_ISLNK (dst_st.st_mode))
goto out;
}
# endif /* RENAME_TRAILING_SLASH_SOURCE_BUG */
ret_val = renameat (fd1, src_temp, fd2, dst_temp);
rename_errno = errno;
out:
if (src_temp != src)
free (src_temp);
if (dst_temp != dst)
free (dst_temp);
errno = rename_errno;
return ret_val;
return renameat2 (fd1, src, fd2, dst, 0);
}
#else /* !HAVE_RENAMEAT */
# include "openat-priv.h"
/* Rename FILE1, in the directory open on descriptor FD1, to FILE2, in
the directory open on descriptor FD2. If possible, do it without
changing the working directory. Otherwise, resort to using
save_cwd/fchdir, then rename/restore_cwd. If either the save_cwd or
the restore_cwd fails, then give a diagnostic and exit nonzero. */
int
renameat (int fd1, char const *file1, int fd2, char const *file2)
{
return at_func2 (fd1, file1, fd2, file2, rename);
}
#endif /* !HAVE_RENAMEAT */
lib/renameat2.c
+205
View File
@@ -0,0 +1,205 @@
/* Rename a file relative to open directories.
Copyright (C) 2009-2017 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 <http://www.gnu.org/licenses/>. */
/* written by Eric Blake and Paul Eggert */
#include <config.h>
#include "renameat2.h"
#include <errno.h>
#include <stdio.h>
#include <unistd.h>
#ifdef __linux__
# include <sys/syscall.h>
#endif
static int
errno_fail (int e)
{
errno = e;
return -1;
}
#if HAVE_RENAMEAT
# include <stdbool.h>
# include <stdlib.h>
# include <string.h>
# include <sys/stat.h>
# include "dirname.h"
# include "openat.h"
#else
# include "openat-priv.h"
static int
rename_noreplace (char const *src, char const *dst)
{
/* This has a race between the call to faccessat and the call to rename. */
int r = faccessat (AT_FDCWD, dst, F_OK, AT_EACCESS | AT_SYMLINK_NOFOLLOW);
reurn (r == 0 ? errno_fail (EEXIST)
: errno == ENOENT ? rename (src, dst)
: r);
}
#endif
/* Rename FILE1, in the directory open on descriptor FD1, to FILE2, in
the directory open on descriptor FD2. If possible, do it without
changing the working directory. Otherwise, resort to using
save_cwd/fchdir, then rename/restore_cwd. If either the save_cwd or
the restore_cwd fails, then give a diagnostic and exit nonzero.
Obey FLAGS when doing the renaming. If FLAGS is zero, this
function is equivalent to renameat (FD1, SRC, FD2, DST). */
int
renameat2 (int fd1, char const *src, int fd2, char const *dst,
unsigned int flags)
{
#ifdef SYS_renameat2
int r = syscall (SYS_renameat2, fd1, src, fd2, dst, flags);
if (! (r < 0 && errno == ENOSYS))
return r;
#endif
#if HAVE_RENAMEAT
{
size_t src_len;
size_t dst_len;
char *src_temp = (char *) src;
char *dst_temp = (char *) dst;
bool src_slash;
bool dst_slash;
int ret_val;
int rename_errno = ENOTDIR;
struct stat src_st;
struct stat dst_st;
if (flags != 0)
{
int r;
/* RENAME_NOREPLACE is the only flag currently supported. */
if (flags & ~RENAME_NOREPLACE)
return errno_fail (ENOTSUP);
/* This has a race between the call to faccessat and the
call to renameat. */
r = faccessat (fd2, dst, F_OK, AT_EACCESS | AT_SYMLINK_NOFOLLOW);
if (r == 0)
return errno_fail (EEXIST);
if (errno != ENOENT)
return r;
}
/* Let strace see any ENOENT failure. */
src_len = strlen (src);
dst_len = strlen (dst);
if (!src_len || !dst_len)
return renameat (fd1, src, fd2, dst);
src_slash = src[src_len - 1] == '/';
dst_slash = dst[dst_len - 1] == '/';
if (!src_slash && !dst_slash)
return renameat (fd1, src, fd2, dst);
/* Presence of a trailing slash requires directory semantics. If
the source does not exist, or if the destination cannot be turned
into a directory, give up now. Otherwise, strip trailing slashes
before calling rename. */
if (lstatat (fd1, src, &src_st))
return -1;
if (lstatat (fd2, dst, &dst_st))
{
if (errno != ENOENT || !S_ISDIR (src_st.st_mode))
return -1;
}
else if (!S_ISDIR (dst_st.st_mode))
return errno_fail (ENOTDIR);
else if (!S_ISDIR (src_st.st_mode))
return errno_fail (EISDIR);
# if RENAME_TRAILING_SLASH_SOURCE_BUG
/* See the lengthy comment in rename.c why Solaris 9 is forced to
GNU behavior, while Solaris 10 is left with POSIX behavior,
regarding symlinks with trailing slash. */
if (src_slash)
{
src_temp = strdup (src);
if (!src_temp)
{
/* Rather than rely on strdup-posix, we set errno ourselves. */
rename_errno = ENOMEM;
goto out;
}
strip_trailing_slashes (src_temp);
if (lstatat (fd1, src_temp, &src_st))
{
rename_errno = errno;
goto out;
}
if (S_ISLNK (src_st.st_mode))
goto out;
}
if (dst_slash)
{
dst_temp = strdup (dst);
if (!dst_temp)
{
rename_errno = ENOMEM;
goto out;
}
strip_trailing_slashes (dst_temp);
if (lstatat (fd2, dst_temp, &dst_st))
{
if (errno != ENOENT)
{
rename_errno = errno;
goto out;
}
}
else if (S_ISLNK (dst_st.st_mode))
goto out;
}
# endif /* RENAME_TRAILING_SLASH_SOURCE_BUG */
/* renameat does not honor trailing / on Solaris 10. Solve it in a
similar manner to rename. No need to worry about bugs not present
on Solaris, since all other systems either lack renameat or honor
trailing slash correctly. */
ret_val = renameat (fd1, src_temp, fd2, dst_temp);
rename_errno = errno;
out:
if (src_temp != src)
free (src_temp);
if (dst_temp != dst)
free (dst_temp);
errno = rename_errno;
return ret_val;
}
#else /* !HAVE_RENAMEAT */
/* RENAME_NOREPLACE is the only flag currently supported. */
if (flags & ~RENAME_NOREPLACE)
return errno_fail (ENOTSUP);
return at_func2 (fd1, file1, fd2, file2,
flags ? rename_noreplace : rename);
#endif /* !HAVE_RENAMEAT */
}
lib/renameat2.h
+30
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@@ -0,0 +1,30 @@
/* Rename a file relative to open directories.
Copyright 2017 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 <http://www.gnu.org/licenses/>. */
/* written by Paul Eggert */
/* Get RENAME_* macros from linux/fs.h if present, otherwise supply
the traditional Linux values. */
#ifdef __linux__
# include <linux/fs.h>
#endif
#ifndef RENAME_NOREPLACE
# define RENAME_NOREPLACE (1 << 0)
# define RENAME_EXCHANGE (1 << 1)
# define RENAME_WHITEOUT (1 << 2)
#endif
extern int renameat2 (int, char const *, int, char const *, unsigned int);
modules/renameat
+1 -16
View File
@@ -2,25 +2,11 @@ Description:
renameat() function: rename a file, relative to two directories
Files:
lib/at-func2.c
lib/renameat.c
m4/renameat.m4
Depends-on:
stdio
extensions
fcntl-h
filenamecat-lgpl [test $HAVE_RENAMEAT = 0 || test $REPLACE_RENAMEAT = 1]
openat-h [test $HAVE_RENAMEAT = 0 || test $REPLACE_RENAMEAT = 1]
statat [test $REPLACE_RENAMEAT = 1]
stdbool [test $REPLACE_RENAMEAT = 1]
at-internal [test $HAVE_RENAMEAT = 0]
dosname [test $HAVE_RENAMEAT = 0]
getcwd-lgpl [test $HAVE_RENAMEAT = 0]
openat-die [test $HAVE_RENAMEAT = 0]
rename [test $HAVE_RENAMEAT = 0]
same-inode [test $HAVE_RENAMEAT = 0]
save-cwd [test $HAVE_RENAMEAT = 0]
renameat2 [test $HAVE_RENAMEAT = 0 || test $REPLACE_RENAMEAT = 1]
configure.ac:
gl_FUNC_RENAMEAT
@@ -35,7 +21,6 @@ gl_STDIO_MODULE_INDICATOR([renameat])
Makefile.am:
Include:
<fcntl.h>
<stdio.h>
License:
modules/renameat-tests
+1 -1
View File
@@ -17,4 +17,4 @@ configure.ac:
Makefile.am:
TESTS += test-renameat
check_PROGRAMS += test-renameat
test_renameat_LDADD = $(LDADD) @LIBINTL@
test_renameat_LDADD = $(LDADD) $(LIB_EACCESS) @LIBINTL@
modules/renameat2
+43
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@@ -0,0 +1,43 @@
Description:
renameat2() function: rename a file, relative to two directories
Files:
lib/at-func2.c
lib/renameat2.c
lib/renameat2.h
m4/renameat.m4
Depends-on:
stdio
extensions
faccessat
fcntl-h
filenamecat-lgpl [test $HAVE_RENAMEAT = 0 || test $REPLACE_RENAMEAT = 1]
openat-h [test $HAVE_RENAMEAT = 0 || test $REPLACE_RENAMEAT = 1]
statat [test $REPLACE_RENAMEAT = 1]
stdbool [test $REPLACE_RENAMEAT = 1]
at-internal [test $HAVE_RENAMEAT = 0]
dosname [test $HAVE_RENAMEAT = 0]
getcwd-lgpl [test $HAVE_RENAMEAT = 0]
openat-die [test $HAVE_RENAMEAT = 0]
rename [test $HAVE_RENAMEAT = 0]
same-inode [test $HAVE_RENAMEAT = 0]
save-cwd [test $HAVE_RENAMEAT = 0]
configure.ac:
gl_FUNC_RENAMEAT
if test $HAVE_RENAMEAT = 0; then
AC_LIBOBJ([at-func2])
fi
Makefile.am:
lib_SOURCES += renameat2.c
Include:
"renameat2.h"
License:
GPL
Maintainer:
Jim Meyering, Eric Blake
modules/renameat2-tests
+20
View File
@@ -0,0 +1,20 @@
Files:
tests/test-rename.h
tests/test-renameat2.c
tests/signature.h
tests/macros.h
Depends-on:
ignore-value
filenamecat
getcwd-lgpl
opendir
readdir
closedir
configure.ac:
Makefile.am:
TESTS += test-renameat2
check_PROGRAMS += test-renameat2
test_renameat2_LDADD = $(LDADD) $(LIB_EACCESS) @LIBINTL@
tests/test-renameat2.c
+209
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@@ -0,0 +1,209 @@
/* Test renameat2.
Copyright (C) 2009-2017 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 <http://www.gnu.org/licenses/>. */
/* Written by Eric Blake <ebb9@byu.net>, 2009. */
#include <config.h>
#include <renameat2.h>
#include <stdio.h>
#include "signature.h"
SIGNATURE_CHECK (renameat2, int,
(int, char const *, int, char const *, unsigned int));
#include <dirent.h>
#include <fcntl.h>
#include <errno.h>
#include <stdbool.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/stat.h>
#include "filenamecat.h"
#include "ignore-value.h"
#include "macros.h"
#define BASE "test-renameat2.t"
#include "test-rename.h"
static int dfd1 = AT_FDCWD;
static int dfd2 = AT_FDCWD;
/* Wrapper to test renameat2 like rename. */
static int
do_rename (char const *name1, char const *name2)
{
return renameat2 (dfd1, name1, dfd2, name2, 0);
}
int
main (void)
{
int i;
int dfd;
char *cwd;
int result;
/* Clean up any trash from prior testsuite runs. */
ignore_value (system ("rm -rf " BASE "*"));
/* Test behaviour for invalid file descriptors. */
{
errno = 0;
ASSERT (renameat2 (-1, "foo", AT_FDCWD, "bar", 0) == -1);
ASSERT (errno == EBADF);
}
{
close (99);
errno = 0;
ASSERT (renameat2 (99, "foo", AT_FDCWD, "bar", 0) == -1);
ASSERT (errno == EBADF);
}
ASSERT (close (creat (BASE "oo", 0600)) == 0);
{
errno = 0;
ASSERT (renameat2 (AT_FDCWD, BASE "oo", -1, "bar", 0) == -1);
ASSERT (errno == EBADF);
}
{
errno = 0;
ASSERT (renameat2 (AT_FDCWD, BASE "oo", 99, "bar", 0) == -1);
ASSERT (errno == EBADF);
}
ASSERT (unlink (BASE "oo") == 0);
/* Test basic rename functionality, using current directory. */
result = test_rename (do_rename, false);
dfd1 = open (".", O_RDONLY);
ASSERT (0 <= dfd1);
ASSERT (test_rename (do_rename, false) == result);
dfd2 = dfd1;
ASSERT (test_rename (do_rename, false) == result);
dfd1 = AT_FDCWD;
ASSERT (test_rename (do_rename, false) == result);
ASSERT (close (dfd2) == 0);
/* Create locations to manipulate. */
ASSERT (mkdir (BASE "sub1", 0700) == 0);
ASSERT (mkdir (BASE "sub2", 0700) == 0);
dfd = creat (BASE "00", 0600);
ASSERT (0 <= dfd);
ASSERT (close (dfd) == 0);
cwd = getcwd (NULL, 0);
ASSERT (cwd);
dfd = open (BASE "sub1", O_RDONLY);
ASSERT (0 <= dfd);
ASSERT (chdir (BASE "sub2") == 0);
/* There are 16 possible scenarios, based on whether an fd is
AT_FDCWD or real, and whether a file is absolute or relative.
To ensure that we test all of the code paths (rather than
triggering early normalization optimizations), we use a loop to
repeatedly rename a file in the parent directory, use an fd open
on subdirectory 1, all while executing in subdirectory 2; all
relative names are thus given with a leading "../". Finally, the
last scenario (two relative paths given, neither one AT_FDCWD)
has two paths, based on whether the two fds are equivalent, so we
do the other variant after the loop. */
for (i = 0; i < 16; i++)
{
int fd1 = (i & 8) ? dfd : AT_FDCWD;
char *file1 = file_name_concat ((i & 4) ? ".." : cwd, BASE "xx", NULL);
int fd2 = (i & 2) ? dfd : AT_FDCWD;
char *file2 = file_name_concat ((i & 1) ? ".." : cwd, BASE "xx", NULL);
ASSERT (sprintf (strchr (file1, '\0') - 2, "%02d", i) == 2);
ASSERT (sprintf (strchr (file2, '\0') - 2, "%02d", i + 1) == 2);
ASSERT (renameat2 (fd1, file1, fd2, file2, 0) == 0);
free (file1);
free (file2);
}
dfd2 = open ("..", O_RDONLY);
ASSERT (0 <= dfd2);
ASSERT (renameat2 (dfd, "../" BASE "16", dfd2, BASE "17", 0) == 0);
ASSERT (close (dfd2) == 0);
/* Now we change back to the parent directory, and set dfd to ".";
using dfd in remaining tests will expose any bugs if emulation
via /proc/self/fd doesn't check for empty names. */
ASSERT (chdir ("..") == 0);
ASSERT (close (dfd) == 0);
dfd = open (".", O_RDONLY);
ASSERT (0 <= dfd);
ASSERT (close (creat (BASE "sub2/file", 0600)) == 0);
errno = 0;
ASSERT (renameat2 (dfd, BASE "sub1", dfd, BASE "sub2", 0) == -1);
ASSERT (errno == EEXIST || errno == ENOTEMPTY);
ASSERT (unlink (BASE "sub2/file") == 0);
errno = 0;
ASSERT (renameat2 (dfd, BASE "sub2", dfd, BASE "sub1/.", 0) == -1);
ASSERT (errno == EINVAL || errno == EISDIR || errno == EBUSY
|| errno == ENOTEMPTY || errno == EEXIST);
errno = 0;
ASSERT (renameat2 (dfd, BASE "sub2/.", dfd, BASE "sub1", 0) == -1);
ASSERT (errno == EINVAL || errno == EBUSY || errno == EEXIST);
errno = 0;
ASSERT (renameat2 (dfd, BASE "17", dfd, BASE "sub1", 0) == -1);
ASSERT (errno == EISDIR);
errno = 0;
ASSERT (renameat2 (dfd, BASE "nosuch", dfd, BASE "18", 0) == -1);
ASSERT (errno == ENOENT);
errno = 0;
ASSERT (renameat2 (dfd, "", dfd, BASE "17", 0) == -1);
ASSERT (errno == ENOENT);
errno = 0;
ASSERT (renameat2 (dfd, BASE "17", dfd, "", 0) == -1);
ASSERT (errno == ENOENT);
errno = 0;
ASSERT (renameat2 (dfd, BASE "sub2", dfd, BASE "17", 0) == -1);
ASSERT (errno == ENOTDIR);
errno = 0;
ASSERT (renameat2 (dfd, BASE "17/", dfd, BASE "18", 0) == -1);
ASSERT (errno == ENOTDIR);
errno = 0;
ASSERT (renameat2 (dfd, BASE "17", dfd, BASE "18/", 0) == -1);
ASSERT (errno == ENOTDIR || errno == ENOENT);
/* Finally, make sure we cannot overwrite existing files. */
ASSERT (close (creat (BASE "sub2/file", 0600)) == 0);
errno = 0;
ASSERT ((renameat2 (dfd, BASE "sub2", dfd, BASE "sub1", RENAME_NOREPLACE)
== -1)
&& errno == EEXIST);
ASSERT ((renameat2 (dfd, BASE "sub2/file", dfd, BASE "17", RENAME_NOREPLACE)
== -1)
&& errno == EEXIST);
/* Cleanup. */
ASSERT (close (dfd) == 0);
ASSERT (unlink (BASE "sub2/file") == 0);
ASSERT (unlink (BASE "17") == 0);
ASSERT (rmdir (BASE "sub1") == 0);
ASSERT (rmdir (BASE "sub2") == 0);
free (cwd);
if (result)
fputs ("skipping test: symlinks not supported on this file system\n",
stderr);
return result;
}