cttyhack: document the need to setsid
function old new delta packed_usage 26988 27057 +69 Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
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@ -649,8 +649,16 @@
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"\n -S SALT" \
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) \
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#define cttyhack_trivial_usage NOUSAGE_STR
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#define cttyhack_full_usage ""
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#define cttyhack_trivial_usage \
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"PROG ARGS"
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#define cttyhack_full_usage "\n\n" \
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"Give PROG a controlling tty if possible." \
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"\nExample for /etc/inittab (for busybox init):" \
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"\n ::respawn:/bin/cttyhack /bin/sh" \
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"\nGiving controlling tty to shell running with PID 1:" \
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"\n $ exec cttyhack sh" \
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"\nStarting an interative shell from boot shell script:" \
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"\n setsid cttyhack sh" \
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#define cut_trivial_usage \
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"[OPTIONS] [FILE]..."
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@ -354,9 +354,20 @@ config CTTYHACK
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It analyzes stdin with various ioctls, trying to determine whether
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it is a /dev/ttyN or /dev/ttySN (virtual terminal or serial line).
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If it detects one, it closes stdin/out/err and reopens that device.
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Then it executes given program. Usage example for /etc/inittab
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(for busybox init):
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Then it executes given program. Opening the device will make
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that device a controlling tty. This may require cttyhack
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to be a session leader.
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Example for /etc/inittab (for busybox init):
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::respawn:/bin/cttyhack /bin/sh
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Giving controlling tty to shell running with PID 1:
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$ exec cttyhack sh
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Starting an interative shell from boot shell script:
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setsid cttyhack sh
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endmenu
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