From 4e4c9052f436b86729b853715086e9445c76e185 Mon Sep 17 00:00:00 2001
From: Yawning Angel <yawning@torproject.org>
Date: Thu, 26 Mar 2015 06:30:50 +0000
Subject: Attempt to detect if the parent crashed without killing obfs4proxy.

The ideal solution here would be to implement #15435, but till then
use one of several kludges:
 * Linux - prctl() so that the kernel SIGTERMs on parent exit.
 * Other U*ix - Poll the parent process id once a second, and SIGTERM
   ourself/exit if it changes.  Former is better since all the normal
   cleanup if any gets done.
 * Windows - Log a warning.
---
 obfs4proxy/obfs4proxy.go | 6 ++++++
 1 file changed, 6 insertions(+)

(limited to 'obfs4proxy/obfs4proxy.go')

diff --git a/obfs4proxy/obfs4proxy.go b/obfs4proxy/obfs4proxy.go
index 53a0218..b27d75d 100644
--- a/obfs4proxy/obfs4proxy.go
+++ b/obfs4proxy/obfs4proxy.go
@@ -386,6 +386,9 @@ func getVersion() string {
 }
 
 func main() {
+	// Initialize parent process monitoring as early as possible.
+	pmonErr := initParentMonitor()
+
 	// Handle the command line arguments.
 	_, execName := path.Split(os.Args[0])
 	showVer := flag.Bool("version", false, "Print version and exit")
@@ -418,6 +421,9 @@ func main() {
 		log.Fatalf("[ERROR]: %s - failed to initialize logging", execName)
 	} else {
 		noticef("%s - launched", getVersion())
+		if pmonErr != nil {
+			warnf("%s - failed to initialize parent monitor: %s", execName, pmonErr)
+		}
 	}
 	if isClient {
 		infof("%s - initializing client transport listeners", execName)
-- 
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