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pause() - Unix, Linux System Call
pause - wait for signal
pause() library function causes the invoking process (or thread) to sleep
until a signal is received that either terminates it or causes it
to call a signal-catching function.
pause() function only returns when a signal was caught and the
signal-catching function returned. In this case
pause() returns -1, and
errno is set to
a signal was caught and the signal-catching function returned.
SVr4, 4.3BSD, POSIX.1-2001.