/* $Id: aplay-rt.c 1103 2006-11-18 22:02:03Z flaterco $ */
/* Run aplay with realtime priority. */

/* This has to be suid root to work. */

/* gcc -O2 -Wall -Wextra -pedantic -s -o aplay-rt aplay-rt.c */
/* chown root. aplay-rt */
/* chmod 4755 aplay-rt */

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

int main (int argc, char **argv) {
  struct sched_param sp;
  sp.sched_priority = sched_get_priority_max(SCHED_FIFO);
  if (sched_setscheduler (0, SCHED_FIFO, &sp))
    fprintf (stderr, "Can't set realtime priority; must be suid root.\n");
  else {
    setuid (getuid()); /* Drop root */
    execv ("/usr/bin/aplay", argv);
    perror ("/usr/bin/aplay");
  }
  exit (-1);
}