1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
|
{- lsof interface
-
- Copyright 2012 Joey Hess <joey@kitenet.net>
-
- Licensed under the GNU GPL version 3 or higher.
-}
{-# LANGUAGE BangPatterns, CPP #-}
module Utility.Lsof where
import Common
import Build.SysConfig as SysConfig
import Utility.Env
import System.Posix.Types
data LsofOpenMode = OpenReadWrite | OpenReadOnly | OpenWriteOnly | OpenUnknown
deriving (Show, Eq)
type CmdLine = String
data ProcessInfo = ProcessInfo ProcessID CmdLine
deriving (Show)
{- lsof is not in PATH on all systems, so SysConfig may have the absolute
- path where the program was found. Make sure at runtime that lsof is
- available, and if it's not in PATH, adjust PATH to contain it. -}
setupLsof :: IO ()
setupLsof = do
let cmd = fromMaybe "lsof" SysConfig.lsof
when (isAbsolute cmd) $ do
path <- getSearchPath
let path' = takeDirectory cmd : path
void $ setEnv "PATH" (intercalate [searchPathSeparator] path') True
{- Checks each of the files in a directory to find open files.
- Note that this will find hard links to files elsewhere that are open. -}
queryDir :: FilePath -> IO [(FilePath, LsofOpenMode, ProcessInfo)]
queryDir path = query ["+d", path]
{- Runs lsof with some parameters.
-
- Ignores nonzero exit code; lsof returns that when no files are open.
-
- Note: If lsof is not available, this always returns [] !
-}
query :: [String] -> IO [(FilePath, LsofOpenMode, ProcessInfo)]
query opts =
withHandle StdoutHandle (createProcessChecked checkSuccessProcess) p $ \h -> do
fileEncoding h
parse <$> hGetContentsStrict h
where
p = proc "lsof" ("-F0can" : opts)
type LsofParser = String -> [(FilePath, LsofOpenMode, ProcessInfo)]
parse :: LsofParser
#ifdef __ANDROID__
parse = parseDefault
#else
parse = parseFormatted
#endif
{- 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.
-}
parseFormatted :: LsofParser
parseFormatted s = bundle $ go [] $ lines s
where
bundle = concatMap (\(fs, p) -> map (\(f, m) -> (f, m, p)) fs)
go c [] = c
go c ((t:r):ls)
| t == 'p' =
let (fs, ls') = parsefiles [] ls
in go ((fs, parseprocess r):c) ls'
| 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
parsefiles c [] = (c, [])
parsefiles c (l:ls) = case splitnull l of
['a':mode, 'n':file, ""] ->
parsefiles ((file, parsemode mode):c) ls
(('p':_):_) -> (c, l:ls)
_ -> parsefail
parsemode ('r':_) = OpenReadOnly
parsemode ('w':_) = OpenWriteOnly
parsemode ('u':_) = OpenReadWrite
parsemode _ = OpenUnknown
splitnull = split "\0"
parsefail = error $ "failed to parse lsof output: " ++ show s
{- Parses lsof's default output format. -}
parseDefault :: LsofParser
parseDefault = catMaybes . map parseline . drop 1 . lines
where
parseline l = case words l of
(command : spid : _user : _fd : _type : _device : _size : _node : rest) ->
case readish spid of
Nothing -> Nothing
Just pid -> Just (unwords rest, OpenUnknown, ProcessInfo pid command)
_ -> Nothing
|
