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/* Copyright (c) 1997-2000 Miller Puckette.
* For information on usage and redistribution, and for a DISCLAIMER OF ALL
* WARRANTIES, see the file, "LICENSE.txt," in this distribution. */
/* This file is compiled into the separate program, "pd-watchdog," which
tries to prevent Pd from locking up the processor if it's at realtime
priority. Linux only. Invoked from s_inter.c. */
#include <sys/time.h>
#include <sys/types.h>
#include <unistd.h>
#include <signal.h>
#include <stdio.h>
int main(int argc, char **argv)
{
int happy = 1;
while (1)
{
struct timeval timout;
fd_set readset;
if (happy)
{
timout.tv_sec = 5;
timout.tv_usec = 0;
}
else
{
timout.tv_sec = 2;
timout.tv_usec = 0;
}
FD_ZERO(&readset);
FD_SET(0, &readset);
select(1, &readset, 0, 0, &timout);
if (FD_ISSET(0, &readset))
{
char buf[100];
happy = 1;
if (read(0, &buf, 100) <= 0)
return (0);
else continue;
}
happy = 0;
kill(getppid(), SIGHUP);
fprintf(stderr, "watchdog: signaling pd...\n");
}
}
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