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| author | Denys Vlasenko | 2010-05-15 20:43:07 +0200 |
|---|---|---|
| committer | Denys Vlasenko | 2010-05-15 20:43:07 +0200 |
| commit | b367bb2a620d3c349b0a61b949a6ebca32bf5395 (patch) | |
| tree | e6871fac55abaae0e388e5351adc0df3081db55f | |
| parent | c84c85ae345f6b3a4ba74ae1ab22acddd41fa456 (diff) | |
| download | busybox-b367bb2a620d3c349b0a61b949a6ebca32bf5395.zip busybox-b367bb2a620d3c349b0a61b949a6ebca32bf5395.tar.gz | |
cttyhack: document the need to setsid
function old new delta
packed_usage 26988 27057 +69
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
| -rw-r--r-- | include/usage.h | 12 | ||||
| -rw-r--r-- | shell/Config.in | 15 |
2 files changed, 23 insertions, 4 deletions
diff --git a/include/usage.h b/include/usage.h index 9d9ad00..be52f18 100644 --- a/include/usage.h +++ b/include/usage.h @@ -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]..." diff --git a/shell/Config.in b/shell/Config.in index 3b16506..36a9317 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 + endmenu |