Hi
2007/1/8, Neil Mitchell <[EMAIL PROTECTED]>:
Hi Stefan,
> I am writing a network server in haskell. Lately I seem to have
> introduced a new bug. On Linux, when a client closes the connection to
> the server, the server dumps core.
Are you using any calls to system? Any libraries which may do funky stuff?
No calls to system. Libraries I use: MissingH (only some time
function) and HaXML.
> application.exe: config.xml: openFile: does not exist (No such file or
> directory)
>
> I use readFile to read the config file. I tried to print out the
> config file after it is read to make sure that it is completely read.
> I only load this config file exactly once during program
> initialization. The config is used long before the crash. I printed
> the current working dir in the exception handler and there is
> something interesting. Instead of the path to the application, it is
> "\C:\\WINDOWS\\system32".
What is the working directory at the begining? Is that really the
working directory? The "\C" at the start isn't the C drive, but some
bizare escape code, I think.
Oups, I think i must have slipped that first \ in by mistake during
the composition of the mail. The path at the start of the application
is d:\development\simulator_v2 and when the error occurs it is
C:\WINDOWS\system32 (without the show i used before).
In the last hours I found out the following:
the program looks something like this:
main = do withSocketsDo $ runSimulator
runSimulator = do
dir <- getCurrentDirectory
putStrLn ("Dir is: " ++ dir)
config <- readConfig
fork many threads
It seems as if runSimulator is executed twice when the error happens.
The first time dir is printed correctly (d:...). Then the application
starts, all threads are created and it runs normally. When the client
closes the socket the error: "<socket: 1832>: hGetChar: failed
(Unknown error)" happens (which in my eyes should rather be
isEOFError?). Then the withSocketsDo seems to execute runSimulator
again (dir then is C:...).
thanks
Stefan
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