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/* Test POSIX lock on an open file (lockf).
Copyright (C) 2019-2025 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 2
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/>.
*/
#include <unistd.h>
#include <stdint.h>
#include <errno.h>
#include <stdio.h>
#include <support/temp_file.h>
#include <support/capture_subprocess.h>
#include <support/check.h>
#ifndef TST_LOCKFD
# define TST_LOCKFD "tst-lockfd."
#endif
#ifndef LOCKF
# define LOCKF lockf
#endif
#ifndef LOCKF64
# define LOCKF64 lockf64
#endif
static char *temp_filename;
static int temp_fd;
static void
do_prepare (int argc, char **argv)
{
temp_fd = create_temp_file (TST_LOCKFD, &temp_filename);
TEST_VERIFY_EXIT (temp_fd != -1);
}
#define PREPARE do_prepare
static void
do_test_child_lockf (void *closure)
{
/* Check if parent has [0, 1024) locked. */
TEST_COMPARE (lseek (temp_fd, 0, SEEK_SET), 0);
TEST_COMPARE (LOCKF (temp_fd, F_TLOCK, 1024), -1);
TEST_COMPARE (errno, EAGAIN);
TEST_COMPARE (LOCKF (temp_fd, F_TEST, 1024), -1);
TEST_COMPARE (errno, EACCES);
/* Also Check if parent has last 1024 bytes locked. */
TEST_COMPARE (lseek (temp_fd, INT32_MAX-1024, SEEK_SET), INT32_MAX-1024);
TEST_COMPARE (LOCKF (temp_fd, F_TEST, 1024), -1);
/* And try to lock [1024, 2048). */
TEST_COMPARE (lseek (temp_fd, 1024, SEEK_SET), 1024);
TEST_COMPARE (LOCKF (temp_fd, F_LOCK, 1024), 0);
/* Check if non-LFS interface cap access to 32-bif off_t. */
TEST_COMPARE (lseek64 (temp_fd, (off64_t)INT32_MAX, SEEK_SET),
(off64_t)INT32_MAX);
TEST_COMPARE (LOCKF64 (temp_fd, F_TEST, 1024), 0);
}
static void
do_test_child_lockf64 (void *closure)
{
/* Check if parent has [0, 1024) locked. */
TEST_COMPARE (lseek64 (temp_fd, 0, SEEK_SET), 0);
TEST_COMPARE (LOCKF64 (temp_fd, F_TLOCK, 1024), -1);
TEST_COMPARE (errno, EAGAIN);
TEST_COMPARE (LOCKF64 (temp_fd, F_TEST, 1024), -1);
TEST_COMPARE (errno, EACCES);
/* Also Check if parent has last 1024 bytes locked. */
TEST_COMPARE (lseek64 (temp_fd, INT32_MAX-1024, SEEK_SET), INT32_MAX-1024);
TEST_COMPARE (LOCKF64 (temp_fd, F_TEST, 1024), -1);
/* And try to lock [1024, 2048). */
TEST_COMPARE (lseek64 (temp_fd, 1024, SEEK_SET), 1024);
TEST_COMPARE (LOCKF64 (temp_fd, F_LOCK, 1024), 0);
/* And also [INT32_MAX, INT32_MAX+1024). */
{
off64_t off = (off64_t)INT32_MAX;
TEST_COMPARE (lseek64 (temp_fd, off, SEEK_SET), off);
TEST_COMPARE (LOCKF64 (temp_fd, F_LOCK, 1024), 0);
}
/* Check if [INT32_MAX+1024, INT64_MAX) is locked. */
{
off64_t off = (off64_t)INT32_MAX+1024;
TEST_COMPARE (lseek64 (temp_fd, off, SEEK_SET), off);
TEST_COMPARE (LOCKF64 (temp_fd, F_TLOCK, 1024), -1);
TEST_COMPARE (errno, EAGAIN);
TEST_COMPARE (LOCKF64 (temp_fd, F_TEST, 1024), -1);
TEST_COMPARE (errno, EACCES);
}
}
static int
do_test (void)
{
/* Basic tests to check if a lock can be obtained and checked. */
TEST_COMPARE (LOCKF (temp_fd, F_LOCK, 1024), 0);
TEST_COMPARE (LOCKF (temp_fd, F_LOCK, INT32_MAX), 0);
TEST_COMPARE (LOCKF (temp_fd, F_TLOCK, 1024), 0);
TEST_COMPARE (LOCKF (temp_fd, F_TEST, 1024), 0);
TEST_COMPARE (lseek (temp_fd, 1024, SEEK_SET), 1024);
TEST_COMPARE (LOCKF (temp_fd, F_ULOCK, 1024), 0);
/* Parent process should have ([0, 1024), [2048, INT32_MAX)) ranges locked. */
{
struct support_capture_subprocess result;
result = support_capture_subprocess (do_test_child_lockf, NULL);
support_capture_subprocess_check (&result, "LOCKF", 0, sc_allow_none);
}
if (sizeof (off_t) != sizeof (off64_t))
{
/* Check if previously locked regions with LFS symbol. */
TEST_COMPARE (lseek (temp_fd, 0, SEEK_SET), 0);
TEST_COMPARE (LOCKF64 (temp_fd, F_LOCK, 1024), 0);
TEST_COMPARE (LOCKF64 (temp_fd, F_TLOCK, 1024), 0);
TEST_COMPARE (LOCKF64 (temp_fd, F_TEST, 1024), 0);
/* Lock region [INT32_MAX+1024, INT64_MAX). */
off64_t off = (off64_t)INT32_MAX + 1024;
TEST_COMPARE (lseek64 (temp_fd, off, SEEK_SET), off);
TEST_COMPARE (LOCKF64 (temp_fd, F_LOCK, 1024), 0);
/* Parent process should have ([0, 1024), [2048, INT32_MAX),
[INT32_MAX+1024, INT64_MAX)) ranges locked. */
{
struct support_capture_subprocess result;
result = support_capture_subprocess (do_test_child_lockf64, NULL);
support_capture_subprocess_check (&result, "LOCKF", 0, sc_allow_none);
}
}
return 0;
}
#include <support/test-driver.c>
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