Library /sys$common/syshlp/helplib.hlb  —  CRTL  sigignore  Return Values
    0                  Indicates success.
    -1                 Indicates an error; errno is set to the
                       following value:

                       o  EINVAL - The value of the signal argument
                          is either an invalid signal number or
                          SIGKILL, or an attempt is made to catch
                          a signal that cannot be intercepted or to
                          ignore a signal that cannot be ignored.
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