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Man Pages
SIGSUSPEND(2) FreeBSD System Calls Manual SIGSUSPEND(2)

sigsuspend
atomically release blocked signals and wait for interrupt

Standard C Library (libc, -lc)

#include <signal.h>
int
sigsuspend(const sigset_t *sigmask);

The sigsuspend() system call temporarily changes the blocked signal mask to the set to which sigmask points, and then waits for a signal to arrive; on return the previous set of masked signals is restored. The signal mask set is usually empty to indicate that all signals are to be unblocked for the duration of the call.
In normal usage, a signal is blocked using sigprocmask(2) to begin a critical section, variables modified on the occurrence of the signal are examined to determine that there is no work to be done, and the process pauses awaiting work by using sigsuspend() with the previous mask returned by sigprocmask(2).

The sigsuspend() system call always terminates by being interrupted, returning -1 with errno set to EINTR.

pselect(2), sigaction(2), sigpending(2), sigprocmask(2), sigtimedwait(2), sigwait(2), sigwaitinfo(2), sigsetops(3)

The sigsuspend() system call is expected to conform to IEEE Std 1003.1-1990 (“POSIX.1”).
August 16, 2013 FreeBSD 12.0-RELEASE

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