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|
{- lsof interface
-
- Copyright 2012 Joey Hess <joey@kitenet.net>
-
- Licensed under the GNU GPL version 3 or higher.
-}
{-# LANGUAGE BangPatterns #-}
module Utility.Lsof where
import Common
import System.Cmd.Utils
import System.Posix.Types
data OpenMode = ReadWrite | ReadOnly | WriteOnly | Unknown
type CmdLine = String
data ProcessInfo = ProcessInfo ProcessID CmdLine
query :: FilePath -> IO [(FilePath, OpenMode, ProcessInfo)]
query p = do
(h, s) <- pipeFrom "lsof" ["-F0can", "--", p]
!r <- parse s
forceSuccess h
return r
{- Parsing null-delimited output like:
-
- pPID\0cCMDLINE\0
- aMODE\0nFILE\0
- aMODE\0nFILE\0
- pPID\0[...]
-
- Where each new process block is started by a pid, and a process can
- have multiple files open.
-}
parse :: String -> [(FilePath, OpenMode, ProcessInfo)]
parse s = go [] $ lines s
where
go c [] = c
go c (l@(t:r):ls)
| t == 'p' = parseprocess r
| otherwise = parsefail
go _ _ = parsefail
parseprocess l =
case splitnull l of
[pid, 'c':cmdline] ->
case readish pid of
(Just n) -> ProcessInfo n cmdline
Nothing -> parsefail
_ -> parsefail
parsefile l =
case splitnull l of
['a':mode, 'n':file] -> (file, parsemode mode)
_ -> parsefail
parsemode ('r':_) = ReadOnly
parsemode ('w':_) = WriteOnly
parsemode ('u':_) = ReadWrite
parsemode _ = Unknown
ls = lines s
splitnull = split "\0"
parsefail = error "failed to parse lsof output: " ++ show s
|
