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// SPDX-License-Identifier: GPL-2.0
#define _GNU_SOURCE
#include <errno.h>
#include <fcntl.h>
#include <linux/kernel.h>
#include <limits.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <syscall.h>
#include <unistd.h>
#include "../kselftest_harness.h"
#ifndef __NR_close_range
#define __NR_close_range -1
#endif
static inline int sys_close_range(unsigned int fd, unsigned int max_fd,
unsigned int flags)
{
return syscall(__NR_close_range, fd, max_fd, flags);
}
#ifndef ARRAY_SIZE
#define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
#endif
TEST(close_range)
{
int i, ret;
int open_fds[101];
for (i = 0; i < ARRAY_SIZE(open_fds); i++) {
int fd;
fd = open("/dev/null", O_RDONLY | O_CLOEXEC);
ASSERT_GE(fd, 0) {
if (errno == ENOENT)
XFAIL(return, "Skipping test since /dev/null does not exist");
}
open_fds[i] = fd;
}
EXPECT_EQ(-1, sys_close_range(open_fds[0], open_fds[100], -1)) {
if (errno == ENOSYS)
XFAIL(return, "close_range() syscall not supported");
}
EXPECT_EQ(0, sys_close_range(open_fds[0], open_fds[50], 0));
for (i = 0; i <= 50; i++)
EXPECT_EQ(-1, fcntl(open_fds[i], F_GETFL));
for (i = 51; i <= 100; i++)
EXPECT_GT(fcntl(open_fds[i], F_GETFL), -1);
/* create a couple of gaps */
close(57);
close(78);
close(81);
close(82);
close(84);
close(90);
EXPECT_EQ(0, sys_close_range(open_fds[51], open_fds[92], 0));
for (i = 51; i <= 92; i++)
EXPECT_EQ(-1, fcntl(open_fds[i], F_GETFL));
for (i = 93; i <= 100; i++)
EXPECT_GT(fcntl(open_fds[i], F_GETFL), -1);
/* test that the kernel caps and still closes all fds */
EXPECT_EQ(0, sys_close_range(open_fds[93], open_fds[99], 0));
for (i = 93; i <= 99; i++)
EXPECT_EQ(-1, fcntl(open_fds[i], F_GETFL));
EXPECT_GT(fcntl(open_fds[i], F_GETFL), -1);
EXPECT_EQ(0, sys_close_range(open_fds[100], open_fds[100], 0));
EXPECT_EQ(-1, fcntl(open_fds[100], F_GETFL));
}
TEST_HARNESS_MAIN
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