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GDB: Does "catch vfork" work?


I'm using gdb to examine the behavior of the screencapture mechanism (handled by SystemUIServer in response to the Cmd-Shift-4 shortcut).

SystemUIServer uses vfork to spawn a new process for the screencapture invocation. In the process of examining gdb's facilities for working with multiple processes, I noticed the intriguing "catch" command.

I thought I would test it out on SystemUIServer since I know it calls vfork. But "catch vfork" doesn't seem to work. Setting a breakpoint on vfork works. I notice that "catch start" kindly informs me that it's not implemented yet. Should "catch vfork" be saying the same thing?

And out of curiosity, what are the benefits of using "catch" as opposed to "break" when the thing that's being caught corresponds to a system call? "catch start" sounds cool because it doesn't correspond to a system call. I guess that may be why it's not implemented yet :)

Thanks!
Daniel

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