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/*
* 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;
}
}
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