This interface is made obsolete by sigsuspend(2).
The sigpause function assigns sigmask to the set of masked signals and then waits for a signal to arrive; on return the set of masked signals is restored. The sigmask argument is usually 0 to indicate that no signals are to be blocked. The sigpause function always terminates by being interrupted, returning -1 with errno set to EINTR
kill(2), sigaction(2), sigblock(2), sigprocmask(2), sigsuspend(2), sigvec(2)