[Haskell-cafe] error handling (esp. IO/exceptions)

[brian at lorf.org]

On Tuesday, 14.04.09 at 22:13, Lennart Augustsson wrote:
> So the right way to do this (like opening a file), is to try executing
> it and let the OS tell you if it failed.

I know, but the various functions that create processes don't help me
know whether the program actually ran or not. For example,

> createProcess (proc "nosuch" []) >>= \(_,_,_,ph) -> waitForProcess ph

returns ExitCode 127. If I use the same code to run 'test', a C program
that returns 127, I get the same thing.