// SPDX-License-Identifier: GPL-2.0#define _GNU_SOURCE#include <sched.h> #include <sys/timerfd.h>#include <sys/syscall.h>#include <sys/types.h>#include <sys/wait.h>#include <time.h>#include <unistd.h>#include <stdlib.h>#include <stdio.h>#include <stdint.h> #include "log.h"#include "timens.h" static int tclock_gettime(clockid_t clockid, struct timespec *now){	if (clockid == CLOCK_BOOTTIME_ALARM)		clockid = CLOCK_BOOTTIME;	return clock_gettime(clockid, now);} static int run_test(int clockid, struct timespec now){	struct itimerspec new_value;	long long elapsed;	int fd, i; 	if (check_skip(clockid))		return 0; 	if (tclock_gettime(clockid, &now))		return pr_perror("clock_gettime(%d)", clockid); 	for (i = 0; i < 2; i++) {		int flags = 0; 		new_value.it_value.tv_sec = 3600;		new_value.it_value.tv_nsec = 0;		new_value.it_interval.tv_sec = 1;		new_value.it_interval.tv_nsec = 0; 		if (i == 1) {			new_value.it_value.tv_sec += now.tv_sec;			new_value.it_value.tv_nsec += now.tv_nsec;		} 		fd = timerfd_create(clockid, 0);		if (fd == -1)			return pr_perror("timerfd_create(%d)", clockid); 		if (i == 1)			flags |= TFD_TIMER_ABSTIME; 		if (timerfd_settime(fd, flags, &new_value, NULL))			return pr_perror("timerfd_settime(%d)", clockid); 		if (timerfd_gettime(fd, &new_value))			return pr_perror("timerfd_gettime(%d)", clockid); 		elapsed = new_value.it_value.tv_sec;		if (llabs(elapsed - 3600) > 60) {			ksft_test_result_fail("clockid: %d elapsed: %lld\n",					      clockid, elapsed);			return 1;		} 		close(fd);	} 	ksft_test_result_pass("clockid=%d\n", clockid); 	return 0;} int main(int argc, char *argv[]){	int ret, status, len, fd;	char buf[4096];	pid_t pid;	struct timespec btime_now, mtime_now; 	ksft_print_header(); 	nscheck(); 	check_supported_timers(); 	ksft_set_plan(3); 	clock_gettime(CLOCK_MONOTONIC, &mtime_now);	clock_gettime(CLOCK_BOOTTIME, &btime_now); 	if (unshare_timens())		return 1; 	len = snprintf(buf, sizeof(buf), "%d %d 0\n%d %d 0",			CLOCK_MONOTONIC, 70 * 24 * 3600,			CLOCK_BOOTTIME, 9 * 24 * 3600);	fd = open("/proc/self/timens_offsets", O_WRONLY);	if (fd < 0)		return pr_perror("/proc/self/timens_offsets"); 	if (write(fd, buf, len) != len)		return pr_perror("/proc/self/timens_offsets"); 	close(fd);	mtime_now.tv_sec += 70 * 24 * 3600;	btime_now.tv_sec += 9 * 24 * 3600; 	pid = fork();	if (pid < 0)		return pr_perror("Unable to fork");	if (pid == 0) {		ret = 0;		ret |= run_test(CLOCK_BOOTTIME, btime_now);		ret |= run_test(CLOCK_MONOTONIC, mtime_now);		ret |= run_test(CLOCK_BOOTTIME_ALARM, btime_now); 		if (ret)			ksft_exit_fail();		ksft_exit_pass();		return ret;	} 	if (waitpid(pid, &status, 0) != pid)		return pr_perror("Unable to wait the child process"); 	if (WIFEXITED(status))		return WEXITSTATUS(status); 	return 1;}