sigignore(2) — DG/UX 4.30



     sigignore(2)               DG/UX 4.30                sigignore(2)



     NAME
          sigignore - Set the signal action of a signal to 'ignore'.

     SYNOPSIS
          #include <signal.h>

          int     sigignore (signal_number)
          int     signal_number;

     PARAMETERS
          signal_number  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, SIGSTOP, or SIGCONT
          (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.

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


          EINVAL         <Signal_number> is an illegal signal number
                         or a signal that may not be ignored.

     SEE ALSO
          The related system calls:  sigset, sighold, sigrelse,
          sigignore, sigpause







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