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getty: add O_NONBLOCK to open which is used to drop ctty
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
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@ -556,10 +556,12 @@ int getty_main(int argc UNUSED_PARAM, char **argv)
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* In this case (setsid failed) we may still have ctty,
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* and it may be different from tty we need to control!
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* If we still have ctty, on Linux ioctl(TIOCSCTTY)
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* (which we are going to call a bit later) always fails.
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* Try to drop ctty now to prevent that.
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* (which we are going to use a bit later) always fails -
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* even if we try to take ctty which is already ours!
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* Try to drop old ctty now to prevent that.
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* Use O_NONBLOCK: old ctty may be a serial line.
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*/
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fd = open("/dev/tty", O_RDWR);
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fd = open("/dev/tty", O_RDWR | O_NONBLOCK);
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if (fd >= 0) {
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ioctl(fd, TIOCNOTTY);
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close(fd);
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