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#include <assert.h>
#include <pthread.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/wait.h>
#include <unistd.h>
void prevent_atforks(void){
exit(1);
}
int main() {
pid_t pid;
int status;
assert(!pthread_atfork(prevent_atforks, NULL, NULL));
switch (pid = vfork()) {
case -1:
perror("vfork");
abort();
case 0:
_exit(12);
default: break;
}
assert(wait(&status) == pid);
assert(WIFEXITED(status) && WEXITSTATUS(status) == 12);
}
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