b367bb2a6
Denys Vlasenko
2010-05-15
Subject
cttyhack: document the need to setsid
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include/usage.h+10 -2
| @@ -649,8 +649,16 @@ | |
| "\n -S SALT" \ | |
| ) \ | |
| - | #define cttyhack_trivial_usage NOUSAGE_STR |
| - | #define cttyhack_full_usage "" |
| + | #define cttyhack_trivial_usage \ |
| + | "PROG ARGS" |
| + | #define cttyhack_full_usage "\n\n" \ |
| + | "Give PROG a controlling tty if possible." \ |
| + | "\nExample for /etc/inittab (for busybox init):" \ |
| + | "\n ::respawn:/bin/cttyhack /bin/sh" \ |
| + | "\nGiving controlling tty to shell running with PID 1:" \ |
| + | "\n $ exec cttyhack sh" \ |
| + | "\nStarting an interative shell from boot shell script:" \ |
| + | "\n setsid cttyhack sh" \ |
| #define cut_trivial_usage \ | |
| "[OPTIONS] [FILE]..." | |
shell/Config.in+13 -2
| @@ -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 |
| + | |
| endmenu | |