problem with FFI and libsane
ganesh at earth.li
Thu Jun 7 23:25:49 CEST 2012
On 07/06/2012 12:08, Simon Marlow wrote:
> I don't completely understand what is going wrong here, but it looks
> like an interaction between the RTS's use of a timer signal and the
> libsane library. You can make it work by turning off GHC's timer with
> +RTS -V0.
> The signal has always been SIGVTALRM, as far as I can tell. Which is
> confusing - if the signal had changed, I could understand that being the
> cause of the difference in behaviour. Perhaps it is just that system
> calls are being interrupted by the signal more often than they were
> before, and libsane does not properly handle EINTR. I looked at the
> strace output and can't see any use of a signal by libsane.
I see, thanks. I'll do some digging into libsane and see if I can work
out more details.
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