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/* $OpenBSD: madness.c,v 1.3 2003/08/02 01:24:36 david Exp $ */
/*
* Written by Artur Grabowski <art@openbsd.org>, 2002 Public Domain.
*/
#include <sys/param.h>
#include <stdio.h>
#include <unistd.h>
#include <signal.h>
#include <stdlib.h>
#include <err.h>
volatile int step;
int
main(int argc, char *argv[])
{
int fds[2], fd;
pid_t pid1, pid2, pid3;
if (pipe(fds) < 0)
err(1, "pipe");
fd = fds[0];
if ((pid1 = rfork(RFPROC|RFMEM|RFFDG|RFNOWAIT)) == 0) {
char foo[1024];
step = 1;
read(fd, foo, sizeof(foo));
_exit(0);
}
if ((pid2 = rfork(RFPROC|RFMEM|RFFDG|RFNOWAIT)) == 0) {
while (step < 1)
sleep(1);
sleep(1);
step = 2;
close(fd);
_exit(0);
}
if ((pid3 = rfork(RFPROC|RFMEM|RFFDG|RFNOWAIT)) == 0) {
while (step < 2)
sleep(1);
sleep(1);
step = 3;
dup2(0, fd);
_exit(0);
}
while (step < 3)
sleep(1);
sleep(1);
kill(pid1, SIGKILL);
kill(pid2, SIGKILL);
kill(pid3, SIGKILL);
return 0;
}
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