osf1 man page for sigpause

sigpause(3)						     Library Functions Manual						       sigpause(3)

NAME
       sigpause - Provides a compatibility interface to the sigsuspend function

LIBRARY
       Standard C Library (libc.so, libc.a)

SYNOPSIS
       #include <signal.h>

       int sigpause (
	       int signal_mask );

STANDARDS
       Interfaces documented on this reference page conform to industry standards as follows:

       sigpause():  XSH4.2

       Refer to the standards(5) reference page for more information about industry standards and associated tags.

PARAMETERS
       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()
       function 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 sigsuspend() function.

NOTES
       [Tru64 UNIX]  When compiled in the X/Open UNIX environment, calls to the sigpause() function are internally renamed by prepending _E to the
       function name. When you are debugging a module that includes the sigpause() function and for which _XOPEN_SOURCE_EXTENDED has been defined,
       use _Esigpause to refer to the sigpause() call.	See standards(5) for information on when the _XOPEN_SOURCE_EXTENDED macro is defined.

RETURN VALUES
       Upon successful completion, sigpause() returns 0 (zero).  Otherwise, -1 is returned and errno is set to indicate the error.

ERRORS
       The sigpause() function sets errno to the specified values for the following conditions: The signal_mask parameter  refers  to  an  illegal
       signal number.  [Tru64 UNIX]  A signal was caught by the calling process.

RELATED INFORMATION
       Functions: pause(3), sigaction(2), sigblock(2), sigprocmask(2), sigsuspend(2), sigvec(2)

       Standards: standards(5) delim off

																       sigpause(3)