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SIGPROCMASK(2)		    BSD	System Calls Manual		SIGPROCMASK(2)

NAME
     sigprocmask -- manipulate current signal mask

LIBRARY
     Standard C	Library	(libc, -lc)

SYNOPSIS
     #include <signal.h>

     int
     sigprocmask(int how, const	sigset_t * restrict set,
	 sigset_t * restrict oset);

DESCRIPTION
     The sigprocmask() function	examines and/or	changes	the current signal
     mask (those signals that are blocked from delivery).  Signals are blocked
     if	they are members of the	current	signal mask set.

     If	set is not null, the action of sigprocmask() depends on	the value of
     the parameter how.	 The signal mask is changed as a function of the spec-
     ified set and the current mask.  The function is specified	by how using
     one of the	following values:

     SIG_BLOCK	  The new mask is the union of the current mask	and the	speci-
		  fied set.

     SIG_UNBLOCK  The new mask is the intersection of the current mask and the
		  complement of	the specified set.

     SIG_SETMASK  The current mask is replaced by the specified	set.

     If	oset is	not null, it is	set to the previous value of the signal	mask.

     When set is null, the value of how	is insignificant and the mask remains
     unset providing a way to examine the signal mask without modification.

     The system	quietly	disallows SIGKILL or SIGSTOP to	be blocked.

RETURN VALUES
     A 0 value indicates that the call succeeded.  A -1	return value indicates
     an	error occurred and errno is set	to indicate the	reason.

ERRORS
     The sigprocmask() call will fail and the signal mask will be unchanged if
     one of the	following occurs:

     [EINVAL]		how has	a value	other than those listed	here.

SEE ALSO
     kill(2), sigaction(2), sigsuspend(2), pthread_sigmask(3), sigsetops(3),
     signal(7)

STANDARDS
     The sigprocmask() function	conforms to ISO/IEC 9945-1:1990	("POSIX.1").

BSD				 June 4, 1993				   BSD

NAME | LIBRARY | SYNOPSIS | DESCRIPTION | RETURN VALUES | ERRORS | SEE ALSO | STANDARDS

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