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pause() causes the calling process (or thread) to sleep until a signal
is delivered that either terminates the process or causes the invoca-
tion of a signal-catching function.
pause() returns only when a signal was caught and the signal-catching
function returned. In this case pause() returns -1, and errno is set
EINTR a signal was caught and the signal-catching function returned.
SVr4, 4.3BSD, POSIX.1-2001.
kill(2), select(2), signal(2), sigsuspend(2)
Linux 2008-10-06 PAUSE(2)