>Number:         31531
>Category:       bin
>Synopsis:       shutdown(8) quietly exit if execed from login shell
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    bin-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Sun Oct 09 14:59:00 +0000 2005
>Originator:     Takahiro Kambe
>Release:        NetBSD 3.99.9
>Organization:
Takahiro Kambe
>Environment:
	
	
System: NetBSD reef.back-street.net 3.99.9 NetBSD 3.99.9 (CF-R3E) #8: Sun Oct 2 12:09:11 JST 2005 taca@reef.back-street.net:/data/i386/obj/sys/arch/i386/compile/CF-R3E i386
Architecture: i386
Machine: i386
>Description:
	shutdown(8) quietly exit if it is execed from login shell.
	I don't know wheather it is a bug or specification, but my old
	memory tells me that there was no such behavior with older *BSD.
>How-To-Repeat:
	1. login root or normal user and execute su(1) with exec shell
	   builtin coommand.

		% exec su
		Password:
		#

	2. exec shutdown(8).

		# exec /sbin/shutdown now

	3. Wait, but nothing happens.

>Fix:
	Background shutdown(8) process is killed with SIGHUP by init(8)
	as a member of login session process.  So, make shutdown(8) have
	its own session.

--- shutdown.c.orig	2005-10-09 23:50:29.000000000 +0900
+++ shutdown.c	2005-10-09 23:50:30.000000000 +0900
@@ -214,17 +214,11 @@
 #else
 	(void)setpriority(PRIO_PROCESS, 0, PRIO_MIN);
 	if (nofork == 0) {
-		int forkpid;
-
-		forkpid = fork();
-		if (forkpid == -1) {
+		if (daemon(0, 1)) {
 			perror("shutdown: fork");
 			exit(1);
 		}
-		if (forkpid) {
-			(void)printf("shutdown: [pid %d]\n", forkpid);
-			exit(0);
-		}
+		(void)printf("shutdown: [pid %d]\n", getpid());
 	}
 #endif
 	openlog("shutdown", LOG_CONS, LOG_AUTH);

>Unformatted: