-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Sergey wrote: > Just found a bug in netplugd after having traced it with strace. netplugd is a > network plug-in/out monitoring daemon, performing the specified actions when > such an event comes up. Comes with net-tools rpm. > > Alright, now the bug. Try to start/restart netplugd from a terminal: > /sbin/service netplugd restart or /etc/init.d/netplugd restart. Starts up > well. Good. Now start mc and run the above command again. It hangs up. Strace > comes with: > > [pid 9404] write(1, "/etc/netplug.d/netplug eth0 prob"..., 46) = ? > ERESTARTSYS (To be restarted) > [pid 9404] --- SIGTTOU (Stopped (tty output)) @ 0 (0) --- > [pid 9404] --- SIGTTOU (Stopped (tty output)) @ 0 (0) --- > > The cloned process is T (stopped). > > # ps axu | grep netplugd > root 9699 0.0 0.1 1548 412 pts/2 S+ 14:23 0:00 netplugd > root 9700 0.0 0.0 1552 252 pts/2 T 14:23 0:00 netplugd > > I am not sure why mc causes such a stop, anyway it is somehow related to > terminal. What if such a script hangs up on a remote system reboot? Bad... > It stopped because it tried to write to the terminal while in the background. When a process running in the background tries to perform output on the terminal, it is sent a SIGTTOU, causing it to stop. I think you're seeing this as a side effect of how mc is running the command. Of course, a demon shouldn't really be doing any terminal IO anyway, so it may still indicate a bug in netplugd. Kind regards, Bryn. -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.1 (GNU/Linux) Comment: Using GnuPG with Fedora - http://enigmail.mozdev.org iD8DBQFDlXgG6YSQoMYUY94RAsCOAKCeBsrSE+japcUIJOXkWtbEk2nHAACeJ2Qs wCmMVgxn7H4+A7BIJih61zY= =ZkeM -----END PGP SIGNATURE-----
