sigignore(2)                   DG/UX 5.4R3.00                   sigignore(2)


NAME
       sigignore - set the signal action of a signal to 'ignore'

SYNOPSIS
       #include <signal.h>

       int  sigignore (signalnumber)
       int  signalnumber;

   where:
       signalnumber  The signal whose action is to be changed to ignore

DESCRIPTION
       Sigignore sets the signal action associated with the specified signal
       to 'ignore' and the signal is removed from the set of signals blocked
       from presentation.  (Any pended signals are also effectively
       discarded because as soon as they are unblocked, they are ignored.)

       It is not possible to ignore SIGKILL or SIGSTOP (see sys/signal.h).
       An attempt to ignore these signals will produce the error EINVAL.

       This system call performs exactly the same basic operation as the
       signal, sigset, and sigvec system calls with the function set to
       SIG_IGN.  Note, however, that sigvec does NOT remove the signal from
       the set of blocked signals.

ACCESS CONTROL
       None.

RETURN VALUE
       0      The operation succeeded.

       -1     The operation failed.

DIAGNOSTICS
       Errno may be set to one of the following error codes:

       EINVAL    Signalnumber is an illegal signal number or a signal that
                 may not be ignored.

SEE ALSO
       sighold(2), sigpause(2), sigrelse(2), sigset(2).















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