centos man page for wait_event_interruptible_timeout

WAIT_EVENT_INTERRUPT(9) 					   Driver Basics					   WAIT_EVENT_INTERRUPT(9)

NAME
       wait_event_interruptible_timeout - sleep until a condition gets true or a timeout elapses

SYNOPSIS
       wait_event_interruptible_timeout(wq, condition, timeout);

ARGUMENTS
       wq
	   the waitqueue to wait on

       condition
	   a C expression for the event to wait for

       timeout
	   timeout, in jiffies

DESCRIPTION
       The process is put to sleep (TASK_INTERRUPTIBLE) until the condition evaluates to true or a signal is received. The condition is checked
       each time the waitqueue wq is woken up.

       wake_up has to be called after changing any variable that could change the result of the wait condition.

RETURNS
       0 if the timeout elapsed, -ERESTARTSYS if it was interrupted by a signal, or the remaining jiffies (at least 1) if the condition evaluated
       to true before the timeout elapsed.

COPYRIGHT
Kernel Hackers Manual 3.10					     June 2014						   WAIT_EVENT_INTERRUPT(9)