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authorPavan Rikhi <pavan.rikhi@gmail.com>2018-03-17 22:48:24 -0400
committerjao <jao@gnu.org>2018-11-21 21:41:35 +0000
commit4d1402a1a7d87767267d48a77998e4fb13395b31 (patch)
tree17fd6160dc1fa9c8a0676a94bcf8d19b551c655c /src/Xmobar/StatFS.hsc
parent9e2a5c7daddf683d4be7c318aefed3da3ea7a89a (diff)
downloadxmobar-4d1402a1a7d87767267d48a77998e4fb13395b31.tar.gz
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Split Modules into Library & Executable Structure
Move the Main module to a new `app` directory. All other modules have been nested under the `Xmobar` name. Lots of module headers & imports were updated.
Diffstat (limited to 'src/Xmobar/StatFS.hsc')
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diff --git a/src/Xmobar/StatFS.hsc b/src/Xmobar/StatFS.hsc
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+-----------------------------------------------------------------------------
+-- |
+-- Module : StatFS
+-- Copyright : (c) Jose A Ortega Ruiz
+-- License : BSD-style (see LICENSE)
+--
+-- Maintainer : Jose A Ortega Ruiz <jao@gnu.org>
+-- Stability : unstable
+-- Portability : unportable
+--
+-- A binding to C's statvfs(2)
+--
+-----------------------------------------------------------------------------
+
+{-# LANGUAGE CPP, ForeignFunctionInterface, EmptyDataDecls #-}
+
+
+module Xmobar.StatFS ( FileSystemStats(..), getFileSystemStats ) where
+
+import Foreign
+import Foreign.C.Types
+import Foreign.C.String
+import Data.ByteString (useAsCString)
+import Data.ByteString.Char8 (pack)
+
+#if defined (__FreeBSD__) || defined (__OpenBSD__) || defined (__APPLE__) || defined (__DragonFly__)
+#define IS_BSD_SYSTEM
+#endif
+
+#ifdef IS_BSD_SYSTEM
+# include <sys/param.h>
+# include <sys/mount.h>
+#else
+# include <sys/vfs.h>
+#endif
+
+data FileSystemStats = FileSystemStats {
+ fsStatBlockSize :: Integer
+ -- ^ Optimal transfer block size.
+ , fsStatBlockCount :: Integer
+ -- ^ Total data blocks in file system.
+ , fsStatByteCount :: Integer
+ -- ^ Total bytes in file system.
+ , fsStatBytesFree :: Integer
+ -- ^ Free bytes in file system.
+ , fsStatBytesAvailable :: Integer
+ -- ^ Free bytes available to non-superusers.
+ , fsStatBytesUsed :: Integer
+ -- ^ Bytes used.
+ } deriving (Show, Eq)
+
+data CStatfs
+
+#ifdef IS_BSD_SYSTEM
+foreign import ccall unsafe "sys/mount.h statfs"
+#else
+foreign import ccall unsafe "sys/vfs.h statvfs"
+#endif
+ c_statfs :: CString -> Ptr CStatfs -> IO CInt
+
+toI :: CULong -> Integer
+toI = toInteger
+
+getFileSystemStats :: String -> IO (Maybe FileSystemStats)
+getFileSystemStats path =
+ allocaBytes (#size struct statfs) $ \vfs ->
+ useAsCString (pack path) $ \cpath -> do
+ res <- c_statfs cpath vfs
+ if res /= 0 then return Nothing
+ else do
+ bsize <- (#peek struct statfs, f_bsize) vfs
+ bcount <- (#peek struct statfs, f_blocks) vfs
+ bfree <- (#peek struct statfs, f_bfree) vfs
+ bavail <- (#peek struct statfs, f_bavail) vfs
+ let bpb = toI bsize
+ return $ Just FileSystemStats
+ { fsStatBlockSize = bpb
+ , fsStatBlockCount = toI bcount
+ , fsStatByteCount = toI bcount * bpb
+ , fsStatBytesFree = toI bfree * bpb
+ , fsStatBytesAvailable = toI bavail * bpb
+ , fsStatBytesUsed = toI (bcount - bfree) * bpb
+ }