1 | // SPDX-License-Identifier: GPL-2.0 |
2 | #define _GNU_SOURCE |
3 | #include <sched.h> |
4 | |
5 | #include <linux/unistd.h> |
6 | #include <linux/futex.h> |
7 | #include <stdio.h> |
8 | #include <string.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 | |
15 | #include "log.h" |
16 | #include "timens.h" |
17 | |
18 | #define NSEC_PER_SEC 1000000000ULL |
19 | |
20 | static int run_test(int clockid) |
21 | { |
22 | int futex_op = FUTEX_WAIT_BITSET; |
23 | struct timespec timeout, end; |
24 | int val = 0; |
25 | |
26 | if (clockid == CLOCK_REALTIME) |
27 | futex_op |= FUTEX_CLOCK_REALTIME; |
28 | |
29 | clock_gettime(clockid, &timeout); |
30 | timeout.tv_nsec += NSEC_PER_SEC / 10; // 100ms |
31 | if (timeout.tv_nsec > NSEC_PER_SEC) { |
32 | timeout.tv_sec++; |
33 | timeout.tv_nsec -= NSEC_PER_SEC; |
34 | } |
35 | |
36 | if (syscall(__NR_futex, &val, futex_op, 0, |
37 | &timeout, 0, FUTEX_BITSET_MATCH_ANY) >= 0) { |
38 | ksft_test_result_fail(msg: "futex didn't return ETIMEDOUT\n" ); |
39 | return 1; |
40 | } |
41 | |
42 | if (errno != ETIMEDOUT) { |
43 | ksft_test_result_fail(msg: "futex didn't return ETIMEDOUT: %s\n" , |
44 | strerror(errno)); |
45 | return 1; |
46 | } |
47 | |
48 | clock_gettime(clockid, &end); |
49 | |
50 | if (end.tv_sec < timeout.tv_sec || |
51 | (end.tv_sec == timeout.tv_sec && end.tv_nsec < timeout.tv_nsec)) { |
52 | ksft_test_result_fail(msg: "futex slept less than 100ms\n" ); |
53 | return 1; |
54 | } |
55 | |
56 | |
57 | ksft_test_result_pass(msg: "futex with the %d clockid\n" , clockid); |
58 | |
59 | return 0; |
60 | } |
61 | |
62 | int main(int argc, char *argv[]) |
63 | { |
64 | int status, len, fd; |
65 | char buf[4096]; |
66 | pid_t pid; |
67 | struct timespec mtime_now; |
68 | |
69 | nscheck(); |
70 | |
71 | ksft_set_plan(plan: 2); |
72 | |
73 | clock_gettime(CLOCK_MONOTONIC, &mtime_now); |
74 | |
75 | if (unshare_timens()) |
76 | return 1; |
77 | |
78 | len = snprintf(buf, size: sizeof(buf), fmt: "%d %d 0" , |
79 | CLOCK_MONOTONIC, 70 * 24 * 3600); |
80 | fd = open("/proc/self/timens_offsets" , O_WRONLY); |
81 | if (fd < 0) |
82 | return pr_perror("/proc/self/timens_offsets" ); |
83 | |
84 | if (write(fd, buf, len) != len) |
85 | return pr_perror("/proc/self/timens_offsets" ); |
86 | |
87 | close(fd); |
88 | |
89 | pid = fork(); |
90 | if (pid < 0) |
91 | return pr_perror("Unable to fork" ); |
92 | if (pid == 0) { |
93 | int ret = 0; |
94 | |
95 | ret |= run_test(CLOCK_REALTIME); |
96 | ret |= run_test(CLOCK_MONOTONIC); |
97 | if (ret) |
98 | ksft_exit_fail(); |
99 | ksft_exit_pass(); |
100 | return 0; |
101 | } |
102 | |
103 | if (waitpid(pid, &status, 0) != pid) |
104 | return pr_perror("Unable to wait the child process" ); |
105 | |
106 | if (WIFEXITED(status)) |
107 | return WEXITSTATUS(status); |
108 | |
109 | return 1; |
110 | } |
111 | |