sigsetops(3C)                                          sigsetops(3C)


       NAME
             sigsetops: sigemptyset, sigfillset, sigaddset, sigdelset,
             sigismember - manipulate sets of signals

       SYNOPSIS
             #include <signal.h>
             int sigemptyset (sigset_t *set);
             int sigfillset (sigset_t *set);
             int sigaddset (sigset_t *set, int signo);
             int sigdelset (sigset_t *set, int signo);
             int sigismember (const sigset_t *set, int signo);

       DESCRIPTION
             These functions manipulate sigset_t data types, representing
             the set of signals supported by the implementation.

             sigemptyset initializes the set pointed to by set to exclude
             all signals defined by the system.

             sigfillset initializes the set pointed to by set to include
             all signals defined by the system.

             sigaddset adds the individual signal specified by the value of
             signo to the set pointed to by set.

             sigdelset deletes the individual signal specified by the value
             of signo from the set pointed to by set.

             sigismember checks whether the signal specified by the value
             of signo is a member of the set pointed to by set.

             Any object of type sigset_t must be initialized by applying
             either sigemptyset or sigfillset before applying any other
             operation.

          Return Values
             Upon successful completion, the sigismember function returns a
             value of one if the specified signal is a member of the
             specified set, or a value of zero if it is not.  Upon
             successful completion, the other functions return a value of
             zero.  Otherwise a value of -1 is returned and errno is set to
             indicate the error.

          Errors




                           Copyright 1994 Novell, Inc.               Page 1

      sigsetops(3C)                                          sigsetops(3C)


            In the following conditions, sigaddset, sigdelset and
            sigismember will fail and set errno to:

            EINVAL         The value of the signo argument is not a valid
                           signal number.

      REFERENCES
            sigaction(2), signal(5), sigpending(2), sigprocmask(2),
            sigsuspend(2)







































                          Copyright 1994 Novell, Inc.               Page 2