projects/linux·blob master · refs

141 lines · 2.7 KiB

1// SPDX-License-Identifier: GPL-2.0
2#define _GNU_SOURCE
3#include <errno.h>
4#include <fcntl.h>
5#include <sched.h>
6#include <stdio.h>
7#include <stdbool.h>
8#include <sys/stat.h>
9#include <sys/syscall.h>
10#include <sys/types.h>
11#include <sys/wait.h>
12#include <time.h>
13#include <unistd.h>
14#include <string.h>
15#include <pthread.h>
16
17#include "log.h"
18#include "timens.h"
19
20#define OFFSET (36000)
21
22struct thread_args {
23 char *tst_name;
24 struct timespec *now;
25};
26
27static void *tcheck(void *_args)
28{
29 struct thread_args *args = _args;
30 struct timespec *now = args->now, tst;
31 int i;
32
33 for (i = 0; i < 2; i++) {
34 _gettime(CLOCK_MONOTONIC, &tst, i);
35 if (labs(tst.tv_sec - now->tv_sec) > 5) {
36 pr_fail("%s: in-thread: unexpected value: %ld (%ld)\n",
37 args->tst_name, tst.tv_sec, now->tv_sec);
38 return (void *)1UL;
39 }
40 }
41 return NULL;
42}
43
44static int check_in_thread(char *tst_name, struct timespec *now)
45{
46 struct thread_args args = {
47 .tst_name = tst_name,
48 .now = now,
49 };
50 pthread_t th;
51 void *retval;
52
53 if (pthread_create(&th, NULL, tcheck, &args))
54 return pr_perror("thread");
55 if (pthread_join(th, &retval))
56 return pr_perror("pthread_join");
57 return !(retval == NULL);
58}
59
60static int check(char *tst_name, struct timespec *now)
61{
62 struct timespec tst;
63 int i;
64
65 for (i = 0; i < 2; i++) {
66 _gettime(CLOCK_MONOTONIC, &tst, i);
67 if (labs(tst.tv_sec - now->tv_sec) > 5)
68 return pr_fail("%s: unexpected value: %ld (%ld)\n",
69 tst_name, tst.tv_sec, now->tv_sec);
70 }
71 if (check_in_thread(tst_name, now))
72 return 1;
73 ksft_test_result_pass("%s\n", tst_name);
74 return 0;
75}
76
77int main(int argc, char *argv[])
78{
79 struct timespec now;
80 int status;
81 pid_t pid;
82
83 if (argc > 1) {
84 char *endptr;
85
86 ksft_cnt.ksft_pass = 1;
87 now.tv_sec = strtoul(argv[1], &endptr, 0);
88 if (*endptr != 0)
89 return pr_perror("strtoul");
90
91 return check("child after exec", &now);
92 }
93
94 ksft_print_header();
95
96 nscheck();
97
98 ksft_set_plan(4);
99
100 clock_gettime(CLOCK_MONOTONIC, &now);
101
102 if (unshare_timens())
103 return 1;
104
105 if (_settime(CLOCK_MONOTONIC, OFFSET))
106 return 1;
107
108 if (check("parent before vfork", &now))
109 return 1;
110
111 pid = vfork();
112 if (pid < 0)
113 return pr_perror("fork");
114
115 if (pid == 0) {
116 char now_str[64];
117 char *cargv[] = {"exec", now_str, NULL};
118 char *cenv[] = {NULL};
119
120 /* Check for proper vvar offsets after execve. */
121 snprintf(now_str, sizeof(now_str), "%ld", now.tv_sec + OFFSET);
122 execve("/proc/self/exe", cargv, cenv);
123 pr_perror("execve");
124 _exit(1);
125 }
126
127 if (waitpid(pid, &status, 0) != pid)
128 return pr_perror("waitpid");
129
130 if (status)
131 ksft_exit_fail();
132 ksft_inc_pass_cnt();
133 ksft_test_result_pass("wait for child\n");
134
135 /* Check that we are still in the source timens. */
136 if (check("parent after vfork", &now))
137 return 1;
138
139 ksft_exit_pass();
140 return 0;
141}