82 lines
1.7 KiB
C
82 lines
1.7 KiB
C
/*
|
|
* Copyright (c) 2021 Alexey Dobriyan <adobriyan@gmail.com>
|
|
*
|
|
* Permission to use, copy, modify, and distribute this software for any
|
|
* purpose with or without fee is hereby granted, provided that the above
|
|
* copyright notice and this permission notice appear in all copies.
|
|
*
|
|
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
|
|
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
|
|
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
|
|
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
|
|
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
|
|
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
|
|
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
|
|
*/
|
|
// Test that /proc/*/task never contains "0".
|
|
#include <sys/types.h>
|
|
#include <dirent.h>
|
|
#include <signal.h>
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <unistd.h>
|
|
#include <pthread.h>
|
|
|
|
static pid_t pid = -1;
|
|
|
|
static void atexit_hook(void)
|
|
{
|
|
if (pid > 0) {
|
|
kill(pid, SIGKILL);
|
|
}
|
|
}
|
|
|
|
static void *f(void *_)
|
|
{
|
|
return NULL;
|
|
}
|
|
|
|
static void sigalrm(int _)
|
|
{
|
|
exit(0);
|
|
}
|
|
|
|
int main(void)
|
|
{
|
|
pid = fork();
|
|
if (pid == 0) {
|
|
/* child */
|
|
while (1) {
|
|
pthread_t pth;
|
|
pthread_create(&pth, NULL, f, NULL);
|
|
pthread_join(pth, NULL);
|
|
}
|
|
} else if (pid > 0) {
|
|
/* parent */
|
|
atexit(atexit_hook);
|
|
|
|
char buf[64];
|
|
snprintf(buf, sizeof(buf), "/proc/%u/task", pid);
|
|
|
|
signal(SIGALRM, sigalrm);
|
|
alarm(1);
|
|
|
|
while (1) {
|
|
DIR *d = opendir(buf);
|
|
struct dirent *de;
|
|
while ((de = readdir(d))) {
|
|
if (strcmp(de->d_name, "0") == 0) {
|
|
exit(1);
|
|
}
|
|
}
|
|
closedir(d);
|
|
}
|
|
|
|
return 0;
|
|
} else {
|
|
perror("fork");
|
|
return 1;
|
|
}
|
|
}
|