| From c218648f1a888a75dc7edae3e89c631818e3c5ca Mon Sep 17 00:00:00 2001 |
| From: Avery Pennarun <apenwarr@gmail.com> |
| Date: Fri, 9 Mar 2012 20:27:16 -0500 |
| Subject: [PATCH] ash: 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 busybox sh useful with "init=/bin/sh" on the Linux kernel command |
| line. |
| --- |
| shell/ash.c | 2 ++ |
| 1 files changed, 2 insertions(+), 0 deletions(-) |
| |
| diff --git a/shell/ash.c b/shell/ash.c |
| index 5671a52..5259dd2 100644 |
| --- a/shell/ash.c |
| +++ b/shell/ash.c |
| @@ -3727,6 +3727,8 @@ setjobctl(int on) |
| if (fd < 0) |
| goto out; |
| /* fd is a tty at this point */ |
| + setsid(); |
| + ioctl(fd, TIOCSCTTY, 0); |
| close_on_exec_on(fd); |
| do { /* while we are in the background */ |
| pgrp = tcgetpgrp(fd); |
| -- |
| 1.7.7.3 |
| |
