pause — wait for signal
pause() causes the calling
process (or thread) to sleep until a signal is delivered that
either terminates the process or causes the invocation of a
pause() returns only when a
signal was caught and the signal-catching function returned.
In this case,
errno is set to
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Copyright (c) 1992 Drew Eckhardt (drewcs.colorado.edu), March 28, 1992
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Modified by Michael Haardt (michaelmoria.de)
Modified Sat Jul 24 14:48:00 1993 by Rik Faith (faithcs.unc.edu)
Modified 1995 by Mike Battersby (mibdeakin.edu.au)
Modified 2000 by aeb, following Michael Kerrisk