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// SPDX-License-Identifier: GPL-2.0-or-later
#define _GNU_SOURCE
#define __SANE_USERSPACE_TYPES__
#include <fcntl.h>
#include <unistd.h>
#include <errno.h>
#include <string.h>
#include <sys/stat.h>
#include "kselftest_harness.h"
#ifndef O_EMPTYPATH
#define O_EMPTYPATH (1 << 26)
#endif
#define EMPTYPATH_TEST_FILE "/tmp/emptypath_test"
FIXTURE(emptypath) {
int opath_fd;
};
FIXTURE_SETUP(emptypath)
{
int fd;
self->opath_fd = -1;
fd = open(EMPTYPATH_TEST_FILE, O_CREAT | O_WRONLY, S_IRWXU);
ASSERT_GE(fd, 0) {
TH_LOG("create %s: %s", EMPTYPATH_TEST_FILE, strerror(errno));
}
close(fd);
self->opath_fd = open(EMPTYPATH_TEST_FILE, O_PATH);
ASSERT_GE(self->opath_fd, 0) {
TH_LOG("open %s O_PATH: %s", EMPTYPATH_TEST_FILE, strerror(errno));
}
}
FIXTURE_TEARDOWN(emptypath)
{
if (self->opath_fd >= 0)
close(self->opath_fd);
unlink(EMPTYPATH_TEST_FILE);
}
/* An empty path is rejected with ENOENT unless O_EMPTYPATH is set. */
TEST_F(emptypath, without_flag_returns_enoent)
{
int fd = openat(self->opath_fd, "", O_RDONLY);
if (fd >= 0)
close(fd);
ASSERT_LT(fd, 0) {
TH_LOG("empty path without O_EMPTYPATH unexpectedly succeeded");
}
EXPECT_EQ(errno, ENOENT) {
TH_LOG("expected ENOENT, got %s", strerror(errno));
}
}
/* O_EMPTYPATH reopens the O_PATH fd through an empty path. */
TEST_F(emptypath, reopens_opath_fd)
{
int fd = openat(self->opath_fd, "", O_RDONLY | O_EMPTYPATH);
if (fd < 0 && errno == EINVAL)
SKIP(return, "O_EMPTYPATH not supported");
ASSERT_GE(fd, 0) {
TH_LOG("O_EMPTYPATH failed: %s", strerror(errno));
}
close(fd);
}
TEST_HARNESS_MAIN
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