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由 Peter Hurley 提交于
Only the current task itself can set its controlling tty (other than before the task has been forked). Equivalent to existing usage. Signed-off-by: NPeter Hurley <peter@hurleysoftware.com> Reviewed-by: NAlan Cox <alan@linux.intel.com> Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
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