peekCString crashes on handling nullPtr
Not quite sure what the 'correct' behaviour here is; but here's a minimal test case:
-bash-3.2$ more TestCase.hs
import Foreign
import Foreign.C
main = do
str <- peekCString nullPtr
putStrLn str
-bash-3.2$ ghc --make TestCase.hs
-bash-3.2$ ./TestCase
Segmentation fault
I was not expecting a seg fault here. At minimum, peekCString documentation should describe what is meant to happen when you pass it a nullPtr (currently not mentioned at all). Better would be some form of error reporting - I'm integrating with a C library, and it took me a while to track down what the root cause of the seg fault was.
Trac metadata
Trac field | Value |
---|---|
Version | 6.12.3 |
Type | Bug |
TypeOfFailure | OtherFailure |
Priority | normal |
Resolution | Unresolved |
Component | Compiler (FFI) |
Test case | |
Differential revisions | |
BlockedBy | |
Related | |
Blocking | |
CC | |
Operating system | |
Architecture |