From b35fc1356ae43ad3c82180cf8c3457e4ace8c63b Mon Sep 17 00:00:00 2001
From: "Michael K. Johnson" <johnsonm@redhat.com>
Date: Mon, 13 Sep 1999 01:54:08 +0000
Subject: do not run multiple copies setsid/setpgid seems to help...

---
 src/ppp-watch.c | 27 +++++++++++++++++++++++++++
 1 file changed, 27 insertions(+)

(limited to 'src')

diff --git a/src/ppp-watch.c b/src/ppp-watch.c
index ad8e2779..b3a7bb53 100644
--- a/src/ppp-watch.c
+++ b/src/ppp-watch.c
@@ -130,11 +130,36 @@ detach(int now, int parentExitCode, char *device) {
 	    close (0);
 	    close (1);
 	    close (2);
+	    setsid();
+	    setpgid(0, 0);
 	}
     }
 }
 
 
+
+static void
+checkPidFile(char *device) {
+    char *pidFilePath;
+    FILE *f;
+    pid_t previous;
+    int killed;
+
+    pidFilePath = alloca(strlen(device) + 25);
+    sprintf(pidFilePath, "/var/run/pppwatch-%s.pid", device);
+    f = fopen(pidFilePath, "r");
+    if (f) {
+	fscanf(f, "%d\n", &previous);
+	fclose(f);
+
+	killed = kill(previous, SIGHUP);
+	if (!killed) {
+	    fprintf(stderr, "%s already up, initiating redial\n", device);
+	    exit(33);
+	}
+    }
+}
+
 static void
 doPidFile(char *device) {
     static char *pidFileName = NULL;
@@ -338,6 +363,8 @@ main(int argc, char **argv) {
 	device = argv[1];
     }
 
+    checkPidFile(device);
+
     detach(0, 0, device); /* prepare */
 
     if (argc > 2 && !strcmp("boot", argv[2])) {
-- 
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