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-rw-r--r--shell/Config.in15
1 files changed, 13 insertions, 2 deletions
diff --git a/shell/Config.in b/shell/Config.in
index 3b1650615..36a931715 100644
--- a/shell/Config.in
+++ b/shell/Config.in
@@ -354,9 +354,20 @@ config CTTYHACK
It analyzes stdin with various ioctls, trying to determine whether
it is a /dev/ttyN or /dev/ttySN (virtual terminal or serial line).
If it detects one, it closes stdin/out/err and reopens that device.
- Then it executes given program. Usage example for /etc/inittab
- (for busybox init):
+ Then it executes given program. Opening the device will make
+ that device a controlling tty. This may require cttyhack
+ to be a session leader.
+
+ Example for /etc/inittab (for busybox init):
::respawn:/bin/cttyhack /bin/sh
+ Giving controlling tty to shell running with PID 1:
+
+ $ exec cttyhack sh
+
+ Starting an interative shell from boot shell script:
+
+ setsid cttyhack sh
+
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