On Wed, Nov 05, 2008 at 08:15:31PM +0000, Daniel P. Berrange wrote: > On Wed, Nov 05, 2008 at 08:49:23PM +0100, Daniel Veillard wrote: > > Okay, that's an API, expecting the app will use it. What i want is > > allow debug without the application being modified which is rather > > different. > > I don't think libraries have any business hooking into application > signal handlers, because each app has its own preferred debugging > infrastructure. And sometimes you just can't expect the app to pass it. SIGUSR2 is hooked in gamin library, which for quite a while was linked to all desktop apps. This never raised any problem, but allowed to get debug informations in situations where it's hard to activate a logger. The more complex the interaction of the library with the system the more it's useful to have this kind of debugging available in my opinion. > In Java, you'd want to hook all this info into log4j, You're still thinking in terms of application driven logging, and this mechanism is different. They suit different purpose. Daniel -- Daniel Veillard | libxml Gnome XML XSLT toolkit http://xmlsoft.org/ daniel@xxxxxxxxxxxx | Rpmfind RPM search engine http://rpmfind.net/ http://veillard.com/ | virtualization library http://libvirt.org/ -- Libvir-list mailing list Libvir-list@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/libvir-list