sigsetops(3P)                                       sigsetops(3P)



NAME
     sigaddset, sigdelset, sigismember, sigfillset, siginitset  -
     manipulate signal sets

SYNOPSIS
     #include <signal.h>

     int sigaddset(set,signo)
     sigset_t *set;
     int signo;

     int sigdelset(set,signo)
     sigset_t *set;
     int signo;

     int sigismember(set,signo)
     sigset_t *set;
     int signo;

     int sigfillset(set)
     sigset_t *set;

     int sigemptyset(set)
     sigset_t *set;

DESCRIPTION
     These routines manipulate sets of signals.  They operate on
     data objects addressable by the application, not on any set
     of signals known to the system. The signal set modified by
     these routines may be used as a parameter to sigagction(3P),
     sigprocmask(3P), sigpending(3P), or sigsispend(3P).
     sigaddset adds the signal specified by signo to the set
     pointed to by set.

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

     POSIX defines the following signals:

        SIGABRT           SIGPIPE           SIGCLD
        SIGALRM           SIGQUIT           SIGCONT
        SIGFPE            SIGSEGV           SIGSTOP
        SIGHUP            SIGTERM           SIGTSTP
        SIGILL            SIGUSR1           SIGTTIN
        SIGINT            SIGUSR2           SIGTTOU
        SIGKILL

     sigfillset initializes the signal set pointed to by set so
     that all POSIX-defined signals are included.

     sigemptyset initializes the signal set pointed to by set so
     that all the POSIX-defined signals are excluded.



January 1992                                                    1

sigsetops(3P)                                       sigsetops(3P)



     Applications must call sigemptyset for each object of type
     sigset_t before any other use of the object.

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

STATUS MESSAGES AND VALUES
     On successful completion, sigismember returns 1 if the
     specified signal is a member of the specified set and
     returns 0 if it is not.  On successful completion, each of
     the other functions returns 0.  For all the functions
     listed, if an error is detected, sigaddset, sigdelset, and
     sigismember return -1 and set errno to indicate the error.

     If any of the following conditions occur, the function
     returns -1 and sets errno to the corresponding value:

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

     EFAULT
          set is an invalid address.

SEE ALSO
     sigprocmask(2P), sigaction(3P), sigpending(3P),
     sigsuspend(3P)





























2                                                    January 1992