diff options
Diffstat (limited to 'System/Posix/User.hsc')
| -rw-r--r-- | System/Posix/User.hsc | 21 |
1 files changed, 15 insertions, 6 deletions
diff --git a/System/Posix/User.hsc b/System/Posix/User.hsc index d7a786d..7ec49b6 100644 --- a/System/Posix/User.hsc +++ b/System/Posix/User.hsc @@ -55,6 +55,10 @@ import Control.Concurrent.MVar ( newMVar, withMVar ) #ifdef HAVE_GETPWENT import Control.Exception #endif +#ifdef HAVE_GETGRNAM_R +import Control.Monad +import System.IO.Error +#endif -- ----------------------------------------------------------------------------- -- user environemnt @@ -187,13 +191,18 @@ getGroupEntryForName :: String -> IO GroupEntry getGroupEntryForName name = do allocaBytes (#const sizeof(struct group)) $ \pgr -> allocaBytes grBufSize $ \pbuf -> - alloca $ \ ppgr -> - withCString name $ \ pstr -> do + alloca $ \ ppgr -> + withCString name $ \ pstr -> do throwErrorIfNonZero_ "getGroupEntryForName" $ - c_getgrnam_r pstr pgr pbuf (fromIntegral grBufSize) ppgr - throwErrnoIfNull "getGroupEntryForName" $ - peekElemOff ppgr 0 - unpackGroupEntry pgr + c_getgrnam_r pstr pgr pbuf (fromIntegral grBufSize) ppgr + r <- peekElemOff ppgr 0 + when (r == nullPtr) $ + ioError $ flip ioeSetErrorString "no group name" + $ mkIOError doesNotExistErrorType + "getGroupEntryForName" + Nothing + (Just name) + unpackGroupEntry pgr foreign import ccall unsafe "getgrnam_r" c_getgrnam_r :: CString -> Ptr CGroup -> CString |