sigsetops(3C)                     SDK R4.11                    sigsetops(3C)


NAME
       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 (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.

       sigaddset, sigdelset and sigismember will fail if the following is
       true:

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

       sigemptyset, sigfillset, sigaddset, sigdelset, and sigismember will
       fail if the following is true:

       EFAULT         The set argument specifies an invalid address.


   Considerations for Threads Programming
                    +------------+-----------------------------+
                    |            |                      async- |
                    |function    | reentrant   cancel   cancel |
                    |            |             point     safe  |
                    +------------+-----------------------------+
                    |sigaddset   |     Y         N        N    |
                    |sigdelset   |     Y         N        N    |
                    |sigemptyset |     Y         N        N    |
                    |sigfillset  |     Y         N        N    |
                    |sigismember |     Y         N        N    |
                    +------------+-----------------------------+

SEE ALSO
       sigaction(2), sigprocmask(2), sigpending(2), sigsuspend(2),
       reentrant(3), signal(5).

DIAGNOSTICS
       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.


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