2018-07-05 16:59:02 +00:00
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/* Linux implementation for renameat2 function.
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2021-01-02 19:32:25 +00:00
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Copyright (C) 2018-2021 Free Software Foundation, Inc.
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2018-07-05 16:59:02 +00:00
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library 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 GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library. If not, see
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Prefer https to http for gnu.org and fsf.org URLs
Also, change sources.redhat.com to sourceware.org.
This patch was automatically generated by running the following shell
script, which uses GNU sed, and which avoids modifying files imported
from upstream:
sed -ri '
s,(http|ftp)(://(.*\.)?(gnu|fsf|sourceware)\.org($|[^.]|\.[^a-z])),https\2,g
s,(http|ftp)(://(.*\.)?)sources\.redhat\.com($|[^.]|\.[^a-z]),https\2sourceware.org\4,g
' \
$(find $(git ls-files) -prune -type f \
! -name '*.po' \
! -name 'ChangeLog*' \
! -path COPYING ! -path COPYING.LIB \
! -path manual/fdl-1.3.texi ! -path manual/lgpl-2.1.texi \
! -path manual/texinfo.tex ! -path scripts/config.guess \
! -path scripts/config.sub ! -path scripts/install-sh \
! -path scripts/mkinstalldirs ! -path scripts/move-if-change \
! -path INSTALL ! -path locale/programs/charmap-kw.h \
! -path po/libc.pot ! -path sysdeps/gnu/errlist.c \
! '(' -name configure \
-execdir test -f configure.ac -o -f configure.in ';' ')' \
! '(' -name preconfigure \
-execdir test -f preconfigure.ac ';' ')' \
-print)
and then by running 'make dist-prepare' to regenerate files built
from the altered files, and then executing the following to cleanup:
chmod a+x sysdeps/unix/sysv/linux/riscv/configure
# Omit irrelevant whitespace and comment-only changes,
# perhaps from a slightly-different Autoconf version.
git checkout -f \
sysdeps/csky/configure \
sysdeps/hppa/configure \
sysdeps/riscv/configure \
sysdeps/unix/sysv/linux/csky/configure
# Omit changes that caused a pre-commit check to fail like this:
# remote: *** error: sysdeps/powerpc/powerpc64/ppc-mcount.S: trailing lines
git checkout -f \
sysdeps/powerpc/powerpc64/ppc-mcount.S \
sysdeps/unix/sysv/linux/s390/s390-64/syscall.S
# Omit change that caused a pre-commit check to fail like this:
# remote: *** error: sysdeps/sparc/sparc64/multiarch/memcpy-ultra3.S: last line does not end in newline
git checkout -f sysdeps/sparc/sparc64/multiarch/memcpy-ultra3.S
2019-09-07 05:40:42 +00:00
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<https://www.gnu.org/licenses/>. */
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2018-07-05 16:59:02 +00:00
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#include <array_length.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <stdbool.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <support/check.h>
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#include <support/support.h>
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#include <support/temp_file.h>
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#include <support/xunistd.h>
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#include <unistd.h>
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/* Directory with the temporary files. */
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static char *directory;
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static int directory_fd;
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/* Paths within that directory. */
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static char *old_path; /* File is called "old". */
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static char *new_path; /* File is called "new". */
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/* Subdirectory within the directory above. */
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static char *subdirectory;
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int subdirectory_fd;
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/* And a pathname in that directory (called "file"). */
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static char *subdir_path;
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static void
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prepare (int argc, char **argv)
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{
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directory = support_create_temp_directory ("tst-renameat2-");
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directory_fd = xopen (directory, O_RDONLY | O_DIRECTORY, 0);
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old_path = xasprintf ("%s/old", directory);
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add_temp_file (old_path);
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new_path = xasprintf ("%s/new", directory);
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add_temp_file (new_path);
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subdirectory = xasprintf ("%s/subdir", directory);
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xmkdir (subdirectory, 0777);
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add_temp_file (subdirectory);
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subdirectory_fd = xopen (subdirectory, O_RDONLY | O_DIRECTORY, 0);
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subdir_path = xasprintf ("%s/file", subdirectory);
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add_temp_file (subdir_path);
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}
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/* Delete all files, preparing a clean slate for the next test. */
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static void
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delete_all_files (void)
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{
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char *files[] = { old_path, new_path, subdir_path };
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for (size_t i = 0; i < array_length (files); ++i)
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if (unlink (files[i]) != 0 && errno != ENOENT)
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FAIL_EXIT1 ("unlink (\"%s\"): %m", files[i]);
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}
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/* Return true if PATH exists in the file system. */
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static bool
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file_exists (const char *path)
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{
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return access (path, F_OK) == 0;
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}
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/* Check that PATH exists and has size EXPECTED_SIZE. */
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static void
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check_size (const char *path, off64_t expected_size)
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{
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struct stat64 st;
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xstat (path, &st);
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if (st.st_size != expected_size)
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FAIL_EXIT1 ("file \"%s\": expected size %lld, actual size %lld",
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path, (unsigned long long int) expected_size,
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(unsigned long long int) st.st_size);
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}
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/* Rename tests where the target does not exist. */
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static void
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rename_without_existing_target (unsigned int flags)
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{
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delete_all_files ();
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support_write_file_string (old_path, "");
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TEST_COMPARE (renameat2 (AT_FDCWD, old_path, AT_FDCWD, new_path, flags), 0);
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TEST_VERIFY (!file_exists (old_path));
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TEST_VERIFY (file_exists (new_path));
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delete_all_files ();
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support_write_file_string (old_path, "");
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TEST_COMPARE (renameat2 (directory_fd, "old", AT_FDCWD, new_path, flags), 0);
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TEST_VERIFY (!file_exists (old_path));
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TEST_VERIFY (file_exists (new_path));
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delete_all_files ();
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support_write_file_string (old_path, "");
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TEST_COMPARE (renameat2 (directory_fd, "old", subdirectory_fd, "file", 0),
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0);
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TEST_VERIFY (!file_exists (old_path));
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TEST_VERIFY (file_exists (subdir_path));
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}
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static int
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do_test (void)
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{
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/* Tests with zero flags argument. These are expected to succeed
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because this renameat2 variant can be implemented with
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renameat. */
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rename_without_existing_target (0);
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/* renameat2 without flags replaces an existing destination. */
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delete_all_files ();
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support_write_file_string (old_path, "123");
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support_write_file_string (new_path, "1234");
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TEST_COMPARE (renameat2 (AT_FDCWD, old_path, AT_FDCWD, new_path, 0), 0);
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TEST_VERIFY (!file_exists (old_path));
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check_size (new_path, 3);
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/* Now we need to check for kernel support of renameat2 with
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flags. */
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delete_all_files ();
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support_write_file_string (old_path, "");
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if (renameat2 (AT_FDCWD, old_path, AT_FDCWD, new_path, RENAME_NOREPLACE)
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!= 0)
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{
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if (errno == EINVAL)
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puts ("warning: no support for renameat2 with flags");
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else
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FAIL_EXIT1 ("renameat2 probe failed: %m");
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}
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else
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{
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/* We have full renameat2 support. */
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rename_without_existing_target (RENAME_NOREPLACE);
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/* Now test RENAME_NOREPLACE with an existing target. */
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delete_all_files ();
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support_write_file_string (old_path, "123");
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support_write_file_string (new_path, "1234");
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TEST_COMPARE (renameat2 (AT_FDCWD, old_path, AT_FDCWD, new_path,
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RENAME_NOREPLACE), -1);
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TEST_COMPARE (errno, EEXIST);
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check_size (old_path, 3);
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check_size (new_path, 4);
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delete_all_files ();
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support_write_file_string (old_path, "123");
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support_write_file_string (new_path, "1234");
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TEST_COMPARE (renameat2 (directory_fd, "old", AT_FDCWD, new_path,
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RENAME_NOREPLACE), -1);
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TEST_COMPARE (errno, EEXIST);
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check_size (old_path, 3);
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check_size (new_path, 4);
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delete_all_files ();
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support_write_file_string (old_path, "123");
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support_write_file_string (subdir_path, "1234");
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TEST_COMPARE (renameat2 (directory_fd, "old", subdirectory_fd, "file",
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RENAME_NOREPLACE), -1);
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TEST_COMPARE (errno, EEXIST);
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check_size (old_path, 3);
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check_size (subdir_path, 4);
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/* The flag combination of RENAME_NOREPLACE and RENAME_EXCHANGE
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is invalid. */
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TEST_COMPARE (renameat2 (directory_fd, "ignored",
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subdirectory_fd, "ignored",
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RENAME_NOREPLACE | RENAME_EXCHANGE), -1);
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TEST_COMPARE (errno, EINVAL);
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}
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/* Create all the pathnames to avoid warnings from the test
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harness. */
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support_write_file_string (old_path, "");
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support_write_file_string (new_path, "");
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support_write_file_string (subdir_path, "");
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free (directory);
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free (subdirectory);
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free (old_path);
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free (new_path);
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free (subdir_path);
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xclose (directory_fd);
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xclose (subdirectory_fd);
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return 0;
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}
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#define PREPARE prepare
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#include <support/test-driver.c>
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