pause - wait for signal
#include <unistd.h> int pause(void);
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 signal-catching function.
a signal was caught and the signal-catching function returned.
POSIX.1-2001, POSIX.1-2008, SVr4, 4.3BSD.
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