On Fri, Nov 11, 2011 at 7:59 PM, Evan Laforge
System.Environment exports:
getProgName :: IO String
maybe System.Posix.ByteString should export a similar function:
getProgName :: IO ByteString
Yeah, that's actually not the same as argv[0], it has the path to the binary stripped. So you can't really use it to restart yourself because you have no way to know what directory the binary was in. It's frustrating because you can see in the source that it's going to some effort to intentionally strip off information that you can't get elsewhere.
FYI, there are at least two libraries out there trying to solve this problem: http://hackage.haskell.org/package/executable-path http://hackage.haskell.org/package/FindBin Unfortunately, there is no standardized way on different unix systems to access the path of the executable running (it's not even fully clear what it means in the presence of symlinks, etc). Actually it seems to be impossible to do this (without argv[0]) on certain BSD systems. Balazs