{-# LINE 1 "libraries/unix/System/Posix/Resource.hsc" #-}
{-# LANGUAGE CApiFFI #-}

{-# LINE 3 "libraries/unix/System/Posix/Resource.hsc" #-}
{-# LANGUAGE Trustworthy #-}

{-# LINE 7 "libraries/unix/System/Posix/Resource.hsc" #-}

-----------------------------------------------------------------------------
-- |
-- Module      :  System.Posix.Resource
-- Copyright   :  (c) The University of Glasgow 2003
-- License     :  BSD-style (see the file libraries/base/LICENSE)
--
-- Maintainer  :  libraries@haskell.org
-- Stability   :  provisional
-- Portability :  non-portable (requires POSIX)
--
-- POSIX resource support
--
-----------------------------------------------------------------------------

module System.Posix.Resource (
    -- * Resource Limits
    ResourceLimit(..), ResourceLimits(..), Resource(..),
    getResourceLimit,
    setResourceLimit,
  ) where



import System.Posix.Types
import Foreign
import Foreign.C


{-# LINE 39 "libraries/unix/System/Posix/Resource.hsc" #-}

{-# LINE 40 "libraries/unix/System/Posix/Resource.hsc" #-}
import GHC.Exts ( considerAccessible )

{-# LINE 42 "libraries/unix/System/Posix/Resource.hsc" #-}

-- -----------------------------------------------------------------------------
-- Resource limits

data Resource
  = ResourceCoreFileSize
  | ResourceCPUTime
  | ResourceDataSize
  | ResourceFileSize
  | ResourceOpenFiles
  | ResourceStackSize

{-# LINE 54 "libraries/unix/System/Posix/Resource.hsc" #-}
  | ResourceTotalMemory

{-# LINE 56 "libraries/unix/System/Posix/Resource.hsc" #-}
  deriving (Eq, Show)

data ResourceLimits
  = ResourceLimits { ResourceLimits -> ResourceLimit
softLimit, ResourceLimits -> ResourceLimit
hardLimit :: ResourceLimit }
  deriving (ResourceLimits -> ResourceLimits -> Bool
(ResourceLimits -> ResourceLimits -> Bool)
-> (ResourceLimits -> ResourceLimits -> Bool) -> Eq ResourceLimits
forall a. (a -> a -> Bool) -> (a -> a -> Bool) -> Eq a
$c== :: ResourceLimits -> ResourceLimits -> Bool
== :: ResourceLimits -> ResourceLimits -> Bool
$c/= :: ResourceLimits -> ResourceLimits -> Bool
/= :: ResourceLimits -> ResourceLimits -> Bool
Eq, Int -> ResourceLimits -> ShowS
[ResourceLimits] -> ShowS
ResourceLimits -> String
(Int -> ResourceLimits -> ShowS)
-> (ResourceLimits -> String)
-> ([ResourceLimits] -> ShowS)
-> Show ResourceLimits
forall a.
(Int -> a -> ShowS) -> (a -> String) -> ([a] -> ShowS) -> Show a
$cshowsPrec :: Int -> ResourceLimits -> ShowS
showsPrec :: Int -> ResourceLimits -> ShowS
$cshow :: ResourceLimits -> String
show :: ResourceLimits -> String
$cshowList :: [ResourceLimits] -> ShowS
showList :: [ResourceLimits] -> ShowS
Show)

data ResourceLimit
  = ResourceLimitInfinity
  | ResourceLimitUnknown
  | ResourceLimit Integer
  deriving (ResourceLimit -> ResourceLimit -> Bool
(ResourceLimit -> ResourceLimit -> Bool)
-> (ResourceLimit -> ResourceLimit -> Bool) -> Eq ResourceLimit
forall a. (a -> a -> Bool) -> (a -> a -> Bool) -> Eq a
$c== :: ResourceLimit -> ResourceLimit -> Bool
== :: ResourceLimit -> ResourceLimit -> Bool
$c/= :: ResourceLimit -> ResourceLimit -> Bool
/= :: ResourceLimit -> ResourceLimit -> Bool
Eq, Int -> ResourceLimit -> ShowS
[ResourceLimit] -> ShowS
ResourceLimit -> String
(Int -> ResourceLimit -> ShowS)
-> (ResourceLimit -> String)
-> ([ResourceLimit] -> ShowS)
-> Show ResourceLimit
forall a.
(Int -> a -> ShowS) -> (a -> String) -> ([a] -> ShowS) -> Show a
$cshowsPrec :: Int -> ResourceLimit -> ShowS
showsPrec :: Int -> ResourceLimit -> ShowS
$cshow :: ResourceLimit -> String
show :: ResourceLimit -> String
$cshowList :: [ResourceLimit] -> ShowS
showList :: [ResourceLimit] -> ShowS
Show)


{-# LINE 81 "libraries/unix/System/Posix/Resource.hsc" #-}

data {-# CTYPE "struct rlimit" #-} RLimit

foreign import capi unsafe "HsUnix.h getrlimit"
  c_getrlimit :: CInt -> Ptr RLimit -> IO CInt

foreign import capi unsafe "HsUnix.h setrlimit"
  c_setrlimit :: CInt -> Ptr RLimit -> IO CInt

getResourceLimit :: Resource -> IO ResourceLimits
getResourceLimit :: Resource -> IO ResourceLimits
getResourceLimit Resource
res = do
  Int -> (Ptr RLimit -> IO ResourceLimits) -> IO ResourceLimits
forall a b. Int -> (Ptr a -> IO b) -> IO b
allocaBytes (Int
16) ((Ptr RLimit -> IO ResourceLimits) -> IO ResourceLimits)
-> (Ptr RLimit -> IO ResourceLimits) -> IO ResourceLimits
forall a b. (a -> b) -> a -> b
$ \Ptr RLimit
p_rlimit -> do
{-# LINE 93 "libraries/unix/System/Posix/Resource.hsc" #-}
    throwErrnoIfMinus1_ "getResourceLimit" $
      c_getrlimit (packResource res) p_rlimit
    soft <- ((\hsc_ptr -> peekByteOff hsc_ptr 0)) p_rlimit
{-# LINE 96 "libraries/unix/System/Posix/Resource.hsc" #-}
    hard <- ((\hsc_ptr -> peekByteOff hsc_ptr 8)) p_rlimit
{-# LINE 97 "libraries/unix/System/Posix/Resource.hsc" #-}
    return (ResourceLimits {
                softLimit = unpackRLimit soft,
                hardLimit = unpackRLimit hard
           })

setResourceLimit :: Resource -> ResourceLimits -> IO ()
setResourceLimit :: Resource -> ResourceLimits -> IO ()
setResourceLimit Resource
res ResourceLimits{softLimit :: ResourceLimits -> ResourceLimit
softLimit=ResourceLimit
soft,hardLimit :: ResourceLimits -> ResourceLimit
hardLimit=ResourceLimit
hard} = do
  Int -> (Ptr RLimit -> IO ()) -> IO ()
forall a b. Int -> (Ptr a -> IO b) -> IO b
allocaBytes (Int
16) ((Ptr RLimit -> IO ()) -> IO ()) -> (Ptr RLimit -> IO ()) -> IO ()
forall a b. (a -> b) -> a -> b
$ \Ptr RLimit
p_rlimit -> do
{-# LINE 105 "libraries/unix/System/Posix/Resource.hsc" #-}
    ((\hsc_ptr -> pokeByteOff hsc_ptr 0)) p_rlimit (packRLimit soft True)
{-# LINE 106 "libraries/unix/System/Posix/Resource.hsc" #-}
    ((\hsc_ptr -> pokeByteOff hsc_ptr 8)) p_rlimit (packRLimit hard False)
{-# LINE 107 "libraries/unix/System/Posix/Resource.hsc" #-}
    throwErrnoIfMinus1_ "setResourceLimit" $
        c_setrlimit (packResource res) p_rlimit
    return ()

packResource :: Resource -> CInt
packResource :: Resource -> CInt
packResource Resource
ResourceCoreFileSize  = (CInt
4)
{-# LINE 113 "libraries/unix/System/Posix/Resource.hsc" #-}
packResource ResourceCPUTime       = (0)
{-# LINE 114 "libraries/unix/System/Posix/Resource.hsc" #-}
packResource ResourceDataSize      = (2)
{-# LINE 115 "libraries/unix/System/Posix/Resource.hsc" #-}
packResource ResourceFileSize      = (1)
{-# LINE 116 "libraries/unix/System/Posix/Resource.hsc" #-}
packResource ResourceOpenFiles     = (7)
{-# LINE 117 "libraries/unix/System/Posix/Resource.hsc" #-}
packResource ResourceStackSize     = (3)
{-# LINE 118 "libraries/unix/System/Posix/Resource.hsc" #-}

{-# LINE 119 "libraries/unix/System/Posix/Resource.hsc" #-}
packResource ResourceTotalMemory   = (9)
{-# LINE 120 "libraries/unix/System/Posix/Resource.hsc" #-}

{-# LINE 121 "libraries/unix/System/Posix/Resource.hsc" #-}

unpackRLimit :: CRLim -> ResourceLimit
unpackRLimit :: CRLim -> ResourceLimit
unpackRLimit (CRLim
18446744073709551615)  = ResourceLimit
ResourceLimitInfinity
{-# LINE 124 "libraries/unix/System/Posix/Resource.hsc" #-}
unpackRLimit other

{-# LINE 126 "libraries/unix/System/Posix/Resource.hsc" #-}
    | ((18446744073709551615) :: CRLim) /= (18446744073709551615)
{-# LINE 127 "libraries/unix/System/Posix/Resource.hsc" #-}
    , other == (18446744073709551615)
{-# LINE 128 "libraries/unix/System/Posix/Resource.hsc" #-}
    = ResourceLimitUnknown

{-# LINE 130 "libraries/unix/System/Posix/Resource.hsc" #-}

{-# LINE 131 "libraries/unix/System/Posix/Resource.hsc" #-}
    | ((18446744073709551615) :: CRLim) /= (18446744073709551615)
{-# LINE 132 "libraries/unix/System/Posix/Resource.hsc" #-}
    , other == (18446744073709551615)
{-# LINE 133 "libraries/unix/System/Posix/Resource.hsc" #-}

{-# LINE 134 "libraries/unix/System/Posix/Resource.hsc" #-}
    , considerAccessible

{-# LINE 136 "libraries/unix/System/Posix/Resource.hsc" #-}
    = ResourceLimitUnknown
    -- (*) This pattern match is redundant if RLIM_SAVED_MAX and RLIM_SAVED_CUR
    -- are both defined and are equal. This redundancy is only detected by GHC
    -- starting from version 9.5, so we use 'considerAccessible'.

{-# LINE 141 "libraries/unix/System/Posix/Resource.hsc" #-}
    | otherwise = ResourceLimit (fromIntegral other)

packRLimit :: ResourceLimit -> Bool -> CRLim
packRLimit :: ResourceLimit -> Bool -> CRLim
packRLimit ResourceLimit
ResourceLimitInfinity Bool
_     = (CRLim
18446744073709551615)
{-# LINE 145 "libraries/unix/System/Posix/Resource.hsc" #-}

{-# LINE 146 "libraries/unix/System/Posix/Resource.hsc" #-}
packRLimit ResourceLimitUnknown  True  = (18446744073709551615)
{-# LINE 147 "libraries/unix/System/Posix/Resource.hsc" #-}

{-# LINE 148 "libraries/unix/System/Posix/Resource.hsc" #-}

{-# LINE 149 "libraries/unix/System/Posix/Resource.hsc" #-}
packRLimit ResourceLimitUnknown  False = (18446744073709551615)
{-# LINE 150 "libraries/unix/System/Posix/Resource.hsc" #-}

{-# LINE 151 "libraries/unix/System/Posix/Resource.hsc" #-}

{-# LINE 157 "libraries/unix/System/Posix/Resource.hsc" #-}
packRLimit (ResourceLimit Integer
other) Bool
_     = Integer -> CRLim
forall a b. (Integral a, Num b) => a -> b
fromIntegral Integer
other


-- -----------------------------------------------------------------------------
-- Test code

{-
import System.Posix
import Control.Monad

main = do
 zipWithM_ (\r n -> setResourceLimit r ResourceLimits{
                                        hardLimit = ResourceLimit n,
                                        softLimit = ResourceLimit n })
        allResources [1..]
 showAll
 mapM_ (\r -> setResourceLimit r ResourceLimits{
                                        hardLimit = ResourceLimit 1,
                                        softLimit = ResourceLimitInfinity })
        allResources
   -- should fail


showAll =
  mapM_ (\r -> getResourceLimit r >>= (putStrLn . showRLims)) allResources

allResources =
    [ResourceCoreFileSize, ResourceCPUTime, ResourceDataSize,
        ResourceFileSize, ResourceOpenFiles, ResourceStackSize
#ifdef RLIMIT_AS
        , ResourceTotalMemory
#endif
        ]

showRLims ResourceLimits{hardLimit=h,softLimit=s}
  = "hard: " ++ showRLim h ++ ", soft: " ++ showRLim s

showRLim ResourceLimitInfinity = "infinity"
showRLim ResourceLimitUnknown  = "unknown"
showRLim (ResourceLimit other)  = show other
-}


{-# LINE 200 "libraries/unix/System/Posix/Resource.hsc" #-}