From 926cfe2647fe3748fd2677a39a76ce29053b7166 Mon Sep 17 00:00:00 2001
From: Avery Pennarun <apenwarr@gmail.com>
Date: Tue, 3 Apr 2012 01:06:24 -0400
Subject: [PATCH 2/2] jobs.c: setsid and TIOCSCTTY when enabling job control.

Both calls will fail if we are already a process group leader, or the
process group leader is not us, or we already have a controlling terminal.
So basically these calls are harmless in the worst case, and get rid of the
annoying "can't access tty; job control turned off" message in the best
case.

This makes dash useful with "init=/bin/sh" on the Linux kernel command
line.
---
 src/jobs.c |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)

diff --git a/src/jobs.c b/src/jobs.c
index a3484c0..0442296 100644
--- a/src/jobs.c
+++ b/src/jobs.c
@@ -198,6 +198,10 @@ setjobctl(int on)
 		}
 		fd = savefd(fd);
 		do { /* while we are in the background */
+			if (tcgetpgrp(fd) < 0) {
+				setsid();
+				ioctl(fd, TIOCSCTTY, 0);
+			}
 			if ((pgrp = tcgetpgrp(fd)) < 0) {
 out:
 				sh_warnx("can't access tty; job control turned off");
-- 
1.7.9