// SPDX-License-Identifier: GPL-2.0#define _GNU_SOURCE#include <errno.h>#include <fcntl.h>#include <sched.h>#include <stdio.h>#include <stdbool.h>#include <sys/stat.h>#include <sys/syscall.h>#include <sys/types.h>#include <sys/wait.h>#include <time.h>#include <unistd.h>#include <string.h>#include <pthread.h> #include "log.h"#include "timens.h" #define OFFSET (36000) struct thread_args {	char *tst_name;	struct timespec *now;}; static void *tcheck(void *_args){	struct thread_args *args = _args;	struct timespec *now = args->now, tst;	int i; 	for (i = 0; i < 2; i++) {		_gettime(CLOCK_MONOTONIC, &tst, i);		if (labs(tst.tv_sec - now->tv_sec) > 5) {			pr_fail("%s: in-thread: unexpected value: %ld (%ld)\n",				args->tst_name, tst.tv_sec, now->tv_sec);			return (void *)1UL;		}	}	return NULL;} static int check_in_thread(char *tst_name, struct timespec *now){	struct thread_args args = {		.tst_name = tst_name,		.now = now,	};	pthread_t th;	void *retval; 	if (pthread_create(&th, NULL, tcheck, &args))		return pr_perror("thread");	if (pthread_join(th, &retval))		return pr_perror("pthread_join");	return !(retval == NULL);} static int check(char *tst_name, struct timespec *now){	struct timespec tst;	int i; 	for (i = 0; i < 2; i++) {		_gettime(CLOCK_MONOTONIC, &tst, i);		if (labs(tst.tv_sec - now->tv_sec) > 5)			return pr_fail("%s: unexpected value: %ld (%ld)\n",					tst_name, tst.tv_sec, now->tv_sec);	}	if (check_in_thread(tst_name, now))		return 1;	ksft_test_result_pass("%s\n", tst_name);	return 0;} int main(int argc, char *argv[]){	struct timespec now;	int status;	pid_t pid; 	if (argc > 1) {		char *endptr; 		ksft_cnt.ksft_pass = 1;		now.tv_sec = strtoul(argv[1], &endptr, 0);		if (*endptr != 0)			return pr_perror("strtoul"); 		return check("child after exec", &now);	} 	ksft_print_header(); 	nscheck(); 	ksft_set_plan(4); 	clock_gettime(CLOCK_MONOTONIC, &now); 	if (unshare_timens())		return 1; 	if (_settime(CLOCK_MONOTONIC, OFFSET))		return 1; 	if (check("parent before vfork", &now))		return 1; 	pid = vfork();	if (pid < 0)		return pr_perror("fork"); 	if (pid == 0) {		char now_str[64];		char *cargv[] = {"exec", now_str, NULL};		char *cenv[] = {NULL}; 		/* Check for proper vvar offsets after execve. */		snprintf(now_str, sizeof(now_str), "%ld", now.tv_sec + OFFSET);		execve("/proc/self/exe", cargv, cenv);		pr_perror("execve");		_exit(1);	} 	if (waitpid(pid, &status, 0) != pid)		return pr_perror("waitpid"); 	if (status)		ksft_exit_fail();	ksft_inc_pass_cnt();	ksft_test_result_pass("wait for child\n"); 	/* Check that we are still in the source timens. */	if (check("parent after vfork", &now))		return 1; 	ksft_exit_pass();	return 0;}