1 files changed, 40 insertions, 0 deletions
diff --git a/desiredata/src/s_watchdog.c b/desiredata/src/s_watchdog.c
new file mode 100644
index 00000000..14089eeb
--- /dev/null
+++ b/desiredata/src/s_watchdog.c
@@ -0,0 +1,40 @@
+/* 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;
+            continue;
+        }
+        happy = 0;
+        kill(getppid(), SIGHUP);
+        fprintf(stderr, "watchdog: signaling pd...\n");
+    }
+}