-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 So Upstart used to have this thing called logd and it would collect and condense all of your service's console messages and make them available. It was all well and good, but the problem was killing logd took down the rest of the system since further writes to stdio caused SIGPIPE. Ultimately it was decided that shipping an additional daemon beside syslogd was a bad idea anyway and that we should look into enhancing that mechanism.
But this still leaves the issue of getting stdio from the process to the logging daemon. I still don't know how to do this, but I have sort of half an idea that would make it work. To do this, we must assume ptracing all the services isn't horrible and stupid. Figuring out how to do it without making that assumption is the other half of the idea that I don't have yet. Scott just found out how to get rid of ptrace for the last reason we had it. We don't need to put it back in. Anyway, suppose we ptraced a service, and suppose it had stderr set to /dev/null. Now, the error messages are going nowhere. BUT, because we've traced the process, we know about all the sytem calls. So we simply intercept any write() calls with 2 as the file descriptor argument and read off the data being written directly. There's no worrying about what happens if either end dies, since technically there's no connection. We're watching the IO, we're not actually participating. So there's a starting point. Anyone care to do the next iteration? - --CJD -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.9 (GNU/Linux) Comment: Using GnuPG with Fedora - http://enigmail.mozdev.org iEYEARECAAYFAknFqFsACgkQIHOkVH4pLz6y9wCgk2gjwhfEgGxOOaeB/HHzK8WB 8ZUAnjB8U+mJHVp//PzvWv3LanAUcVoX =XAnq -----END PGP SIGNATURE----- -- upstart-devel mailing list upstart-devel@lists.ubuntu.com Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/upstart-devel
