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SIGPAUSE(3) Library Functions Manual SIGPAUSE(3)

atomically release blocked signals and wait for interrupt

#include <signal.h>
sigpause(int sigmask);

This interface is made obsolete by sigsuspend(2).
sigpause() 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. sigmask is usually 0 to indicate that no signals are to be blocked. sigpause() always terminates by being interrupted, returning -1 with errno set to EINTR.

kill(2), sigaction(2), sigprocmask(2), sigsuspend(2), sigblock(3), sigvec(3)

A sigpause() system call first appeared in 4.2BSD. In 4.3BSD-Reno, it was reimplemented as a wrapper around sigsuspend(2). The old system call was kept for compatibility until OpenBSD 4.9.
July 17, 2013 OpenBSD-current