ultrix man page for sigpause

sigpause(2)							System Calls Manual						       sigpause(2)

Name
       sigpause - atomically release blocked signals and wait for interrupt

Syntax
       sigpause(sigmask)
       int sigmask;

Description
       The  system  call 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 is usually 0 to indicate that no signals are now to be blocked.  The  always  terminates  by  being  interrupted,
       returning EINTR.

       In  normal  usage,  a  signal is blocked using at the beginning of a critical section of code.  Variables modified on the occurrence of the
       signal are examined to determine if there is any work to be done. The process pauses, awaiting work, by using with the mask returned by

See Also
       sigblock(2), sigvec(2)

																       sigpause(2)