sigsetops man page on 4.4BSD

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SIGSETOPS(3)		 BSD Library Functions Manual		  SIGSETOPS(3)

NAME
     sigemptyset, sigfillset, sigaddset, sigdelset, sigismember — manipulate
     signal sets

SYNOPSIS
     #include <signal.h>

     sigemptyset(sigset_t *set);

     sigfillset(sigset_t *set);

     sigaddset(sigset_t *set, int signo);

     sigdelset(sigset_t *set, int signo);

     sigismember(sigset_t *set, int signo);

DESCRIPTION
     These functions manipulate signal sets stored in a sigset_t.  Either
     sigemptyset() or sigfillset() must be called for every object of type
     sigset_t before any other use of the object.

     The sigemptyset() function initializes a signal set to be empty.

     The sigfillset() function initializes a signal set to contain all sig‐
     nals.

     The sigaddset() function adds the specified signal signo to the signal
     set.

     The sigdelset() function deletes the specified signal signo from the sig‐
     nal set.

     The sigismember() function returns whether a specified signal signo is
     contained in the signal set.

     These functions are provided as macros in the include file <signal.h>.
     Actual functions are available if their names are undefined (with #undef
     name).

RETURN VALUES
     The sigismember() function returns 1 if the signal is a member of the
     set, 0 otherwise.	The other functions return 0.

ERRORS
     Currently no errors are detected.

SEE ALSO
     kill(2), sigaction(2), sigsuspend(2)

STANDARDS
     These functions are defined by IEEE Std 1003.1-1988 (“POSIX.1”).

BSD				 June 4, 1993				   BSD
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