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Diffstat (limited to 'io/tst-open-tmpfile.c')
-rw-r--r--io/tst-open-tmpfile.c318
1 files changed, 0 insertions, 318 deletions
diff --git a/io/tst-open-tmpfile.c b/io/tst-open-tmpfile.c
deleted file mode 100644
index 485109706f..0000000000
--- a/io/tst-open-tmpfile.c
+++ /dev/null
@@ -1,318 +0,0 @@
-/* Test open and openat with O_TMPFILE.
- Copyright (C) 2016-2017 Free Software Foundation, Inc.
- This file is part of the GNU C Library.
-
- The GNU C Library is free software; you can redistribute it and/or
- modify it under the terms of the GNU Lesser General Public
- License as published by the Free Software Foundation; either
- version 2.1 of the License, or (at your option) any later version.
-
- The GNU C Library 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
- Lesser General Public License for more details.
-
- You should have received a copy of the GNU Lesser General Public
- License along with the GNU C Library; if not, see
- <http://www.gnu.org/licenses/>. */
-
-/* This test verifies that open and openat work as expected, i.e. they
- create a deleted file with the requested file mode. */
-
-#include <errno.h>
-#include <fcntl.h>
-#include <stdbool.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <sys/stat.h>
-#include <unistd.h>
-
-#include <support/support.h>
-
-#ifdef O_TMPFILE
-typedef int (*wrapper_func) (const char *, int, mode_t);
-
-/* Error-checking wrapper for the open function, compatible with the
- wrapper_func type. */
-static int
-wrap_open (const char *path, int flags, mode_t mode)
-{
- int ret = open (path, flags, mode);
- if (ret < 0)
- {
- printf ("error: open (\"%s\", 0x%x, 0%03o): %m\n", path, flags, mode);
- exit (1);
- }
- return ret;
-}
-
-/* Error-checking wrapper for the openat function, compatible with the
- wrapper_func type. */
-static int
-wrap_openat (const char *path, int flags, mode_t mode)
-{
- int ret = openat (AT_FDCWD, path, flags, mode);
- if (ret < 0)
- {
- printf ("error: openat (\"%s\", 0x%x, 0%03o): %m\n", path, flags, mode);
- exit (1);
- }
- return ret;
-}
-
-/* Error-checking wrapper for the open64 function, compatible with the
- wrapper_func type. */
-static int
-wrap_open64 (const char *path, int flags, mode_t mode)
-{
- int ret = open64 (path, flags, mode);
- if (ret < 0)
- {
- printf ("error: open64 (\"%s\", 0x%x, 0%03o): %m\n", path, flags, mode);
- exit (1);
- }
- return ret;
-}
-
-/* Error-checking wrapper for the openat64 function, compatible with the
- wrapper_func type. */
-static int
-wrap_openat64 (const char *path, int flags, mode_t mode)
-{
- int ret = openat64 (AT_FDCWD, path, flags, mode);
- if (ret < 0)
- {
- printf ("error: openat64 (\"%s\", 0x%x, 0%03o): %m\n", path, flags, mode);
- exit (1);
- }
- return ret;
-}
-
-/* Return true if FD is flagged as deleted in /proc/self/fd, false if
- not. */
-static bool
-is_file_deteted (int fd)
-{
- char *proc_fd_path = xasprintf ("/proc/self/fd/%d", fd);
- char file_path[4096];
- ssize_t file_path_length
- = readlink (proc_fd_path, file_path, sizeof (file_path));
- if (file_path_length < 0)
- {
- printf ("error: readlink (\"%s\"): %m", proc_fd_path);
- free (proc_fd_path);
- exit (1);
- }
- free (proc_fd_path);
- if (file_path_length == sizeof (file_path))
- {
- printf ("error: path in /proc resolves to overlong file name: %.*s\n",
- (int) file_path_length, file_path);
- exit (1);
- }
- const char *deleted = " (deleted)";
- if (file_path_length < strlen (deleted))
- {
- printf ("error: path in /proc is too short: %.*s\n",
- (int) file_path_length, file_path);
- exit (1);
- }
- return memcmp (file_path + file_path_length - strlen (deleted),
- deleted, strlen (deleted)) == 0;
-}
-
-/* Obtain a file name which is difficult to guess. */
-static char *
-get_random_name (void)
-{
- unsigned long long bytes[2];
- int random_device = open ("/dev/urandom", O_RDONLY);
- if (random_device < 0)
- {
- printf ("error: open (\"/dev/urandom\"): %m\n");
- exit (1);
- }
- ssize_t ret = read (random_device, bytes, sizeof (bytes));
- if (ret < 0)
- {
- printf ("error: read (\"/dev/urandom\"): %m\n");
- exit (1);
- }
- if (ret != sizeof (bytes))
- {
- printf ("error: short read from /dev/urandom: %zd\n", ret);
- exit (1);
- }
- close (random_device);
- return xasprintf ("tst-open-tmpfile-%08llx%08llx.tmp", bytes[0], bytes[1]);
-}
-
-/* Check open/openat (as specified by OP and WRAPPER) with a specific
- PATH/FLAGS/MODE combination. */
-static void
-check_wrapper_flags_mode (const char *op, wrapper_func wrapper,
- const char *path, int flags, mode_t mode)
-{
- int fd = wrapper (path, flags | O_TMPFILE, mode);
- struct stat64 st;
- if (fstat64 (fd, &st) != 0)
- {
- printf ("error: fstat64: %m\n");
- exit (1);
- }
-
- /* Verify that the mode was correctly processed. */
- int actual_mode = st.st_mode & 0777;
- if (actual_mode != mode)
- {
- printf ("error: unexpected mode; expected 0%03o, actual 0%03o\n",
- mode, actual_mode);
- exit (1);
- }
-
- /* Check that the file is marked as deleted in /proc. */
- if (!is_file_deteted (fd))
- {
- printf ("error: path in /proc is not marked as deleted\n");
- exit (1);
- }
-
- /* Check that the file can be turned into a regular file with
- linkat. Open a file descriptor for the directory at PATH. Use
- AT_FDCWD if PATH is ".", to exercise that functionality as
- well. */
- int path_fd;
- if (strcmp (path, ".") == 0)
- path_fd = AT_FDCWD;
- else
- {
- path_fd = open (path, O_RDONLY | O_DIRECTORY);
- if (path_fd < 0)
- {
- printf ("error: open (\"%s\"): %m\n", path);
- exit (1);
- }
- }
-
- /* Use a hard-to-guess name for the new directory entry. */
- char *new_name = get_random_name ();
-
- /* linkat does not require privileges if the path in /proc/self/fd
- is used. */
- char *proc_fd_path = xasprintf ("/proc/self/fd/%d", fd);
- if (linkat (AT_FDCWD, proc_fd_path, path_fd, new_name,
- AT_SYMLINK_FOLLOW) == 0)
- {
- if (unlinkat (path_fd, new_name, 0) != 0 && errno != ENOENT)
- {
- printf ("error: unlinkat (\"%s/%s\"): %m\n", path, new_name);
- exit (1);
- }
- }
- else
- {
- /* linkat failed. This is expected if O_EXCL was specified. */
- if ((flags & O_EXCL) == 0)
- {
- printf ("error: linkat failed after %s (\"%s\", 0x%x, 0%03o): %m\n",
- op, path, flags, mode);
- exit (1);
- }
- }
-
- free (proc_fd_path);
- free (new_name);
- if (path_fd != AT_FDCWD)
- close (path_fd);
- close (fd);
-}
-
-/* Check OP/WRAPPER with various flags at a specific PATH and
- MODE. */
-static void
-check_wrapper_mode (const char *op, wrapper_func wrapper,
- const char *path, mode_t mode)
-{
- check_wrapper_flags_mode (op, wrapper, path, O_WRONLY, mode);
- check_wrapper_flags_mode (op, wrapper, path, O_WRONLY | O_EXCL, mode);
- check_wrapper_flags_mode (op, wrapper, path, O_RDWR, mode);
- check_wrapper_flags_mode (op, wrapper, path, O_RDWR | O_EXCL, mode);
-}
-
-/* Check open/openat with varying permissions. */
-static void
-check_wrapper (const char *op, wrapper_func wrapper,
- const char *path)
-{
- printf ("info: testing %s at: %s\n", op, path);
- check_wrapper_mode (op, wrapper, path, 0);
- check_wrapper_mode (op, wrapper, path, 0640);
- check_wrapper_mode (op, wrapper, path, 0600);
- check_wrapper_mode (op, wrapper, path, 0755);
- check_wrapper_mode (op, wrapper, path, 0750);
-}
-
-/* Verify that the directory at PATH supports O_TMPFILE. Exit with
- status 77 (unsupported) if the kernel does not support O_TMPFILE.
- Even with kernel support, not all file systems O_TMPFILE, so return
- true if the directory supports O_TMPFILE, false if not. */
-static bool
-probe_path (const char *path)
-{
- int fd = openat (AT_FDCWD, path, O_TMPFILE | O_RDWR, 0);
- if (fd < 0)
- {
- if (errno == EISDIR)
- /* The system does not support O_TMPFILE. */
- {
- printf ("info: kernel does not support O_TMPFILE\n");
- exit (77);
- }
- if (errno == EOPNOTSUPP)
- {
- printf ("info: path does not support O_TMPFILE: %s\n", path);
- return false;
- }
- printf ("error: openat (\"%s\", O_TMPFILE | O_RDWR): %m\n", path);
- exit (1);
- }
- close (fd);
- return true;
-}
-
-static int
-do_test (void)
-{
- umask (0);
- const char *paths[] = { ".", "/dev/shm", "/tmp",
- getenv ("TEST_TMPFILE_PATH"),
- NULL };
- bool supported = false;
- for (int i = 0; paths[i] != NULL; ++i)
- if (probe_path (paths[i]))
- {
- supported = true;
- check_wrapper ("open", wrap_open, paths[i]);
- check_wrapper ("openat", wrap_openat, paths[i]);
- check_wrapper ("open64", wrap_open64, paths[i]);
- check_wrapper ("openat64", wrap_openat64, paths[i]);
- }
-
- if (!supported)
- return 77;
-
- return 0;
-}
-
-#else /* !O_TMPFILE */
-
-static int
-do_test (void)
-{
- return 77;
-}
-
-#endif /* O_TMPFILE */
-
-#include <support/test-driver.c>
generated by cgit v1.2.3-70-g09d2 (git 2.48.1) at 2025-07-07 10:16:36 +0000