NAME
	  sigpause - Provides a	compatibility interface	to the sig-
	  suspend function

     LIBRARY
	  Standard C Library (libc.a)

     SYNOPSIS
	  #include <signal.h>

	  int sigpause (
	       int signal_mask );

     PARAMETERS
	  signal_mask
	       Specifies which signals to block.

     DESCRIPTION
	  The sigpause() function call blocks the signals specified by
	  the signal_mask parameter and	then suspends execution	of the
	  process until	delivery of a signal whose action is either to
	  execute a signal-catching function or	to end the process.
	  Signal of value i is blocked if the i-th bit of the mask is
	  set.	Only signals with values 1 to 31 can be	blocked	with
	  the sigpause() function. In addition,	the sigpause() func-
	  tion does not	allow the SIGKILL, SIGSTOP, or SIGCONT signals
	  to be	blocked.  If a program attempts	to block one of	these
	  signals, the sigpause() function gives no indication of the
	  error.

	  The sigpause() function sets the signal mask and waits for
	  an unblocked signal as one atomic operation. This means that
	  signals cannot occur between the operations of setting the
	  mask and waiting for a signal.

	  The sigpause() function is provided for compatibility	with
	  older	UNIX systems; its function is a	subset of the sig-
	  suspend() function.

     RETURN VALUES
	  If a signal is caught	by the calling process and control is
	  returned from	the signal handler, the	calling	process
	  resumes execution after the sigpause() function, which
	  always returns a value of -1 and sets	errno to [EINTR].

	  If delivery of a signal causes the process to	end, the sig-
	  pause() function does	not return.

	  If delivery of a signal causes a signal-catching function to
	  execute, the sigpause() function returns after the signal-
	  catching function returns, with the signal mask restored to
	  the set that existed prior to	the sigpause() call.
     RELATED INFORMATION
	  Functions: pause(3), sigaction(2), sigblock(2),
	  sigprocmask(2), sigsuspend(2), sigvec(2)