pause man page
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 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 to EINTR.
a signal was caught and the signal-catching function returned.
POSIX.1-2001, POSIX.1-2008, SVr4, 4.3BSD.
kill(2), select(2), signal(2), sigsuspend(2)
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alarm(2), pmpause(1), ptrace(2), sigaction(2), signal(2), signal(7), signal-safety(7), sigprocmask(2), sigset(3), sigsuspend(2), sigvec(3), stress-ng(1), syscalls(2), wait(2).