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the TTY. In such a case, ttydev_close() is called multiple times and each time, t_revokecnt is incremented and cv_broadcast() is called for both the t_outwait and t_inwait condition variables. Let's say revoke(2) comes in first and gets to call tty_drain() from ttydev_leave(). Let's say that the revoke comes from init(8) as the result of running "shutdown -r now". Since shutdown prints various messages to the console before announing that the machine will reboot immediately, let's also say that the output queue is not empty and that tty_drain() has something to do. Let's assume this all happens on a 9600 baud serial console, so it takes a time to drain. The shutdown command will exit(2) and as such will end up closing stdout. Let's say this close will come in second, bump t_revokecnt and call tty_wakeup(). This has tty_wait() return prematurely and the next thing that will happen is that the thread doing revoke(2) will flush the TTY. Since the drain wasn't complete, the flush will effectively drop whatever is left in t_outq. This change takes into account that tty_drain() will return ERESTART due to the fact that t_revokecnt was bumped and in that case simply call tty_drain() again. The thread in question is already performing the close so it can safely finish draining the TTY before destroying the TTY structure. Now all messages from shutdown will be printed on the serial console. Obtained from: Juniper Networks, Inc.
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