Hi
2007/1/8, Neil Mitchell
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: "