bsd man page for sigpause

SIGPAUSE(2)							System Calls Manual						       SIGPAUSE(2)

NAME
       sigpause - atomically release blocked signals and wait for interrupt

SYNOPSIS
       sigpause(sigmask)
       long sigmask;

DESCRIPTION
       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 0L to indicate that no signals are now to be blocked.   Sigpause  always  terminates  by  being  interrupted,
       returning -1 with errno set to EINTR.

       In normal usage, a signal is blocked using sigblock(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 sigpause with the	mask  returned	by
       sigblock.

SEE ALSO
       sigblock(2), sigvec(2)

4th Berkeley Distribution					   May 15, 1986 						       SIGPAUSE(2)