USERNETCTL(1)

NAME
       netreport  -  request  notification  of  network interface
       changes

SYNOPSIS
       netreport [-r]

DESCRIPTION
       netreport tells the network management scripts to  send  a
       SIGIO  signal  to  the process which called netreport when
       any network interface status changes occur.

OPTIONS
       -r     Remove the current request (if any) for the calling
              process.

NOTES
       If  a  program  does not call netreport with the -r option
       before it exits, and another process is created  with  the
       same  PID  before any changes take place in interface sta-
       tus, it is possible that the new process  will  receive  a
       spurious SIGIO.