From 51fcf61630905f5dc9370e18522cd0a6c086856d Mon Sep 17 00:00:00 2001
From: Jakob Unterwurzacher
Date: Mon, 9 Nov 2015 23:21:11 +0100
Subject: Use new arg "-notifypid" for more robust daemonization

No more string matching on the parent command line!
---
 sendusr1.go | 33 ++++++++-------------------------
 1 file changed, 8 insertions(+), 25 deletions(-)

(limited to 'sendusr1.go')

diff --git a/sendusr1.go b/sendusr1.go
index c5dbb7c..5de8a6f 100644
--- a/sendusr1.go
+++ b/sendusr1.go
@@ -1,38 +1,21 @@
 package main
 
 import (
-	"bytes"
 	"fmt"
-	"io/ioutil"
 	"os"
 	"syscall"
 )
 
-const (
-	wrapperContains = "gocryptfs\000"
-)
-
-// Send USR1 to the parent process. This notifies it that the
-// mounting has completed sucessfully.
-//
-// Checks /proc/$PPID/cmdline to make sure we do not kill an unrelated process.
-func sendUsr1() {
-	ppid := os.Getppid()
-	fn := fmt.Sprintf("/proc/%d/cmdline", ppid)
-	cmdline, err := ioutil.ReadFile(fn)
+// Send signal USR1 to "pid" (usually our parent process). This notifies it
+// that the mounting has completed sucessfully.
+func sendUsr1(pid int) {
+	p, err := os.FindProcess(pid)
 	if err != nil {
-		fmt.Printf("sendUsr1: ReadFile: %v\n", err)
+		fmt.Printf("sendUsr1: FindProcess: %v\n", err)
 		return
 	}
-	if bytes.Contains(cmdline, []byte(wrapperContains)) {
-		p, err := os.FindProcess(ppid)
-		if err != nil {
-			fmt.Printf("sendUsr1: FindProcess: %v\n", err)
-			return
-		}
-		err = p.Signal(syscall.SIGUSR1)
-		if err != nil {
-			fmt.Printf("sendUsr1: Signal: %v\n", err)
-		}
+	err = p.Signal(syscall.SIGUSR1)
+	if err != nil {
+		fmt.Printf("sendUsr1: Signal: %v\n", err)
 	}
 }
-- 
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