On Feb 12, 2008 8:38 PM, Jeremy Shaw
I get funny results when I call getSymbolicLinkStatus in ghc 6.8.2 on Ubuntu 7.10. This happens on several systems and has been confirmed by other people.
Currently I'm looking at hsc2hs for this bug. On a 32 bit box here: int main() { struct stat st; printf("size of structure is %d\n", sizeof(st)); printf("inode is at offset %d\n", __builtin_offsetof(struct stat, st_ino)); } Gives: size of structure is 88 inode is at offset 12 However, building Files.hsc gives: fileID (FileStatus stat) = unsafePerformIO $ withForeignPtr stat $ ((\hsc_ptr -> peekByteOff hsc_ptr 88)) {-# LINE 315 "Files.hsc" #-} e.g. it's reading random memory at the end of the structure. Looking at the code from the documentation: http://haskell.org/ghc/docs/latest/html/libraries/unix/src/System-Posix-File... fileID (FileStatus stat) = unsafePerformIO $ withForeignPtr stat $ ((\hsc_ptr -> peekByteOff hsc_ptr 8)) {-# LINE 315 "System/Posix/Files.hsc" #-} Seems like it might work, but that offset is too small. It appears that it might be a 64-bit build (because the size of the stat structure which when it gets malloced is 144), but a 64-bit build should have larger offsets, not smaller. You can't write your own fileID function, because FileStatus isn't exported from Posix.Files. You can, however, write getSymbolicLinkInode a c function (which does both the lstat and extraction from the structure) and FFI it. AGL -- Adam Langley agl@imperialviolet.org http://www.imperialviolet.org 650-283-9641