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cttyhack: document the need to setsid

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function                                             old     new   delta
packed_usage                                       26988   27057     +69

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko 2010-05-15 20:43:07 +02:00
parent c84c85ae34
commit b367bb2a62
2 changed files with 23 additions and 4 deletions
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12
include/usage.h
View File

@ -649,8 +649,16 @@
"\n -S SALT" \ "\n -S SALT" \
) \ ) \
#define cttyhack_trivial_usage NOUSAGE_STR #define cttyhack_trivial_usage \
#define cttyhack_full_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 \ #define cut_trivial_usage \
"[OPTIONS] [FILE]..." "[OPTIONS] [FILE]..."

15
shell/Config.in
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@ -354,9 +354,20 @@ config CTTYHACK
It analyzes stdin with various ioctls, trying to determine whether It analyzes stdin with various ioctls, trying to determine whether
it is a /dev/ttyN or /dev/ttySN (virtual terminal or serial line). 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. If it detects one, it closes stdin/out/err and reopens that device.
Then it executes given program. Usage example for /etc/inittab Then it executes given program. Opening the device will make
(for busybox init): 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 ::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 endmenu