Commit | Line | Data |
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0658a096 FW |
1 | /* |
2 | * Copyright (c) 2021 Alexey Dobriyan <adobriyan@gmail.com> | |
3 | * | |
4 | * Permission to use, copy, modify, and distribute this software for any | |
5 | * purpose with or without fee is hereby granted, provided that the above | |
6 | * copyright notice and this permission notice appear in all copies. | |
7 | * | |
8 | * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES | |
9 | * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF | |
10 | * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR | |
11 | * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES | |
12 | * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN | |
13 | * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF | |
14 | * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. | |
15 | */ | |
16 | // Test that /proc/*/task never contains "0". | |
17 | #include <sys/types.h> | |
18 | #include <dirent.h> | |
19 | #include <signal.h> | |
20 | #include <stdio.h> | |
21 | #include <stdlib.h> | |
22 | #include <string.h> | |
23 | #include <unistd.h> | |
24 | #include <pthread.h> | |
25 | ||
26 | static pid_t pid = -1; | |
27 | ||
28 | static void atexit_hook(void) | |
29 | { | |
30 | if (pid > 0) { | |
31 | kill(pid, SIGKILL); | |
32 | } | |
33 | } | |
34 | ||
35 | static void *f(void *_) | |
36 | { | |
37 | return NULL; | |
38 | } | |
39 | ||
40 | static void sigalrm(int _) | |
41 | { | |
42 | exit(0); | |
43 | } | |
44 | ||
45 | int main(void) | |
46 | { | |
47 | pid = fork(); | |
48 | if (pid == 0) { | |
49 | /* child */ | |
50 | while (1) { | |
51 | pthread_t pth; | |
52 | pthread_create(&pth, NULL, f, NULL); | |
53 | pthread_join(pth, NULL); | |
54 | } | |
55 | } else if (pid > 0) { | |
56 | /* parent */ | |
57 | atexit(atexit_hook); | |
58 | ||
59 | char buf[64]; | |
60 | snprintf(buf, sizeof(buf), "/proc/%u/task", pid); | |
61 | ||
62 | signal(SIGALRM, sigalrm); | |
63 | alarm(1); | |
64 | ||
65 | while (1) { | |
66 | DIR *d = opendir(buf); | |
67 | struct dirent *de; | |
68 | while ((de = readdir(d))) { | |
69 | if (strcmp(de->d_name, "0") == 0) { | |
70 | exit(1); | |
71 | } | |
72 | } | |
73 | closedir(d); | |
74 | } | |
75 | ||
76 | return 0; | |
77 | } else { | |
78 | perror("fork"); | |
79 | return 1; | |
80 | } | |
81 | } |