From: Todd C. Miller <Todd.Miller@courtesan.com>
Date: Thu, 2 Dec 2004 14:53:20 +0000 (+0000)
Subject: Use the double fork trick to avoid the monitor process being waited
X-Git-Tag: SUDO_1_7_0~776
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=d88e6523a38dc9300c5248d094f64ae84f4ac289;p=sudo

Use the double fork trick to avoid the monitor process being waited
for by the main program run through sudo.
---

diff --git a/mon_systrace.c b/mon_systrace.c
index 94bd2a453..21dce6b4f 100644
--- a/mon_systrace.c
+++ b/mon_systrace.c
@@ -125,7 +125,18 @@ systrace_attach(pid)
     case -1:
 	error(1, "can't fork");
     case 0:
-	/* tracer */
+	/* tracer, fork again to completely disassociate */
+	switch (fork()) {
+	    case -1:
+		warning("can't fork");
+		kill(pid, SIGKILL);
+		_exit(1);
+	    case 0:
+		break;
+	    default:
+		/* the main sudo process will wait for us */
+		_exit(0);
+	}
 	break;
     default:
 	/* tracee, sleep until the tracer process wakes us up. */