"Simon Marlow"
It's probably quite naughty of us to install a SIGINT handler without checking whether there was already one installed. The relevant code is in ghc/rts/Signals.c around line 359. If you send me a patch I'll incorporate it.
Hmmm, ghc/rts/Signals.c only has 358 lines. :-) Maybe this is a clue as to why ghc has such dodgy line numbers in its error reports... No, hold on, `cvs update', ah that's better.
For a quick workaround, if you install your own handler *after* calling startupHaskell(), you should be able to override GHC's.
The thing is, that's what I'm already doing. At least, Haskell is in charge of the execution, and does quite a lot of things before calling out to an I/O action written in C, which then sets the handler. My best guess is that the use of signal() is incompatible with the POSIX sigaction() used by the RTS. Regards, Malcolm