[project @ 2001-08-10 11:02:00 by simonmar]

[ghc-hetmet.git] / ghc / lib / std / PrelPosix.hsc

diff --git a/ghc/lib/std/PrelPosix.hsc b/ghc/lib/std/PrelPosix.hsc
index 50268ed..59b953c 100644 (file)
--- a/ghc/lib/std/PrelPosix.hsc
+++ b/ghc/lib/std/PrelPosix.hsc
@@ -1,7 +1,7 @@
 {-# OPTIONS -fno-implicit-prelude -optc-DNON_POSIX_SOURCE #-}
 
 -- ---------------------------------------------------------------------------
--- $Id: PrelPosix.hsc,v 1.5 2001/05/30 16:39:22 sewardj Exp $
+-- $Id: PrelPosix.hsc,v 1.10 2001/08/10 11:02:00 simonmar Exp $
 --
 -- POSIX support layer for the standard libraries
 --
@@ -90,22 +90,35 @@ fdType fd =
 ioe_unknownfiletype = IOError Nothing UnsupportedOperation "fdType"
                        "unknown file type" Nothing
 
-foreign import "s_isreg_wrap" s_isreg :: CMode -> Bool
+foreign import "s_isreg_wrap" unsafe s_isreg :: CMode -> Bool
 #def inline int s_isreg_wrap(m) { return S_ISREG(m); }
 
-foreign import "s_isdir_wrap" s_isdir :: CMode -> Bool
+foreign import "s_isdir_wrap" unsafe s_isdir :: CMode -> Bool
 #def inline int s_isdir_wrap(m) { return S_ISDIR(m); }
 
-foreign import "s_isfifo_wrap" s_isfifo :: CMode -> Bool
+foreign import "s_isfifo_wrap" unsafe s_isfifo :: CMode -> Bool
 #def inline int s_isfifo_wrap(m) { return S_ISFIFO(m); }
 
 #ifndef mingw32_TARGET_OS
-foreign import "s_issock_wrap" s_issock :: CMode -> Bool
+foreign import "s_issock_wrap" unsafe s_issock :: CMode -> Bool
 #def inline int s_issock_wrap(m) { return S_ISSOCK(m); }
 #else
 s_issock :: CMode -> Bool
 s_issock cmode = False
 #endif
+
+-- It isn't clear whether ftruncate is POSIX or not (I've read several
+-- manpages and they seem to conflict), so we truncate using open/2.
+fileTruncate :: FilePath -> IO ()
+fileTruncate file = do
+  let flags = o_WRONLY .|. o_TRUNC
+  withCString file $ \file_cstr -> do
+    fd <- fromIntegral `liftM`
+           throwErrnoIfMinus1Retry "fileTruncate"
+               (c_open file_cstr (fromIntegral flags) 0o666)
+    c_close fd
+  return ()
+
 -- ---------------------------------------------------------------------------
 -- Terminal-related stuff
 
@@ -256,6 +269,9 @@ foreign import "lseek" unsafe
 foreign import "write" unsafe 
    c_write :: CInt -> Ptr CChar -> CSize -> IO CSsize
 
+foreign import "read" unsafe 
+   c_read :: CInt -> Ptr CChar -> CSize -> IO CSsize
+
 #ifndef mingw32_TARGET_OS
 foreign import "fcntl" unsafe
    fcntl_read  :: CInt -> CInt -> IO CInt
@@ -266,9 +282,6 @@ foreign import "fcntl" unsafe
 foreign import "fork" unsafe
    fork :: IO CPid 
 
-foreign import "read" unsafe 
-   c_read :: CInt -> Ptr CChar -> CSize -> IO CSsize
-
 foreign import "sigemptyset" unsafe
    c_sigemptyset :: Ptr CSigset -> IO ()
 
@@ -284,6 +297,9 @@ foreign import "tcgetattr" unsafe
 foreign import "tcsetattr" unsafe
    c_tcsetattr :: CInt -> CInt -> Ptr Termios -> IO CInt
 
+foreign import "unlink" unsafe 
+   c_unlink :: CString -> IO CInt
+
 foreign import "waitpid" unsafe
    c_waitpid :: CPid -> Ptr CInt -> CInt -> IO CPid
 #endif