{-# language BangPatterns #-} {-# language DataKinds #-} {-# language DuplicateRecordFields #-} {-# language GADTSyntax #-} {-# language KindSignatures #-} {-# language LambdaCase #-} {-# language MagicHash #-} {-# language NamedFieldPuns #-} {-# language PatternSynonyms #-} {-# language ScopedTypeVariables #-} {-# language UnboxedTuples #-} {-# language UnliftedFFITypes #-} -- | Types and functions related to the POSIX sockets API. -- Unusual characteristics: -- -- * Any time the standard calls for @socklen_t@, we use -- @CInt@ instead. Linus Torvalds -- that \"Any sane library must have @socklen_t@ be the same size as @int@. -- Anything else breaks any BSD socket layer stuff.\" -- * Send and receive each have several variants. They are distinguished by -- the safe\/unsafe FFI use and by the @Addr@\/@ByteArray@/@MutableByteArray@ -- buffer type. They all call @send@ or @recv@ exactly once. They do not -- repeatedly make syscalls like some of the functions in @network@. -- Users who want that behavior need to build on top of this package. -- * There are no requirements on the pinnedness of @ByteArray@ arguments -- passed to any of these functions. If wrappers of the safe FFI are -- passed unpinned @ByteArray@ arguments, they will copy the contents -- into pinned memory before invoking the foreign function. module Posix.Socket ( -- * Functions -- ** Socket uninterruptibleSocket -- ** Socket Pair , uninterruptibleSocketPair -- ** Address Resolution , getAddressInfo , uninterruptibleFreeAddressInfo -- ** Bind , uninterruptibleBind -- ** Connect , connect , uninterruptibleConnect -- ** Listen , uninterruptibleListen -- ** Accept , accept , uninterruptibleAccept , accept_ -- ** Get Socket Name , uninterruptibleGetSocketName -- ** Get Socket Option , uninterruptibleGetSocketOption -- ** Set Socket Option , uninterruptibleSetSocketOption , uninterruptibleSetSocketOptionByteArray , uninterruptibleSetSocketOptionInt -- ** Close , F.close , F.uninterruptibleClose , F.uninterruptibleErrorlessClose -- ** Shutdown , uninterruptibleShutdown -- ** Send , send , sendByteArray , sendMutableByteArray , uninterruptibleSend , uninterruptibleSendByteArray , uninterruptibleSendMutableByteArray -- ** Send To , uninterruptibleSendToByteArray , uninterruptibleSendToMutableByteArray , uninterruptibleSendToInternet , uninterruptibleSendToInternetByteArray , uninterruptibleSendToInternetMutableByteArray -- ** Write Vector , writeVector -- ** Receive , receive , receiveByteArray , uninterruptibleReceive , uninterruptibleReceiveMutableByteArray -- ** Receive From , uninterruptibleReceiveFromMutableByteArray , uninterruptibleReceiveFromMutableByteArray_ , uninterruptibleReceiveFrom_ , uninterruptibleReceiveFromInternet , uninterruptibleReceiveFromInternetMutableByteArray -- ** Receive Message -- $receiveMessage , uninterruptibleReceiveMessageA , uninterruptibleReceiveMessageB -- ** Send Message , uninterruptibleSendMessageA , uninterruptibleSendMessageB , uninterruptibleSendByteArrays -- ** Byte-Order Conversion -- $conversion , hostToNetworkLong , hostToNetworkShort , networkToHostLong , networkToHostShort -- * Types , Family(..) , Type(..) , Protocol(..) , OptionName(..) , OptionValue(..) , Level(..) , Message(..) , MessageFlags(..) , ShutdownType(..) , AddressInfo -- * Socket Address -- ** Types , SocketAddress(..) , PST.SocketAddressInternet(..) , PST.SocketAddressUnix(..) -- ** Encoding , PSP.encodeSocketAddressInternet , PSP.encodeSocketAddressUnix -- ** Decoding , PSP.decodeSocketAddressInternet , PSP.indexSocketAddressInternet -- ** Sizes , PSP.sizeofSocketAddressInternet -- * Data Construction -- ** Socket Domains , pattern PST.Unix , pattern PST.Unspecified , pattern PST.Internet , pattern PST.Internet6 -- ** Socket Types , PST.stream , PST.datagram , PST.raw , PST.sequencedPacket -- ** Protocols , PST.defaultProtocol , PST.rawProtocol , PST.icmp , PST.tcp , PST.udp , PST.ip , PST.ipv6 -- ** Receive Flags , PST.peek , PST.outOfBand , PST.waitAll -- ** Send Flags , PST.noSignal -- ** Shutdown Types , PST.read , PST.write , PST.readWrite -- ** Socket Levels , PST.levelSocket -- ** Option Names , PST.optionError , PST.bindToDevice , PST.broadcast , PST.reuseAddress -- ** Address Info -- *** Peek , PST.peekAddressInfoFlags -- *** Poke , PST.pokeAddressInfoFlags -- *** Metadata , PST.sizeofAddressInfo -- ** Message Header -- *** Peek , PST.peekMessageHeaderName , PST.peekMessageHeaderNameLength , PST.peekMessageHeaderIOVector , PST.peekMessageHeaderIOVectorLength , PST.peekMessageHeaderControl , PST.peekMessageHeaderControlLength , PST.peekMessageHeaderFlags , PST.peekControlMessageHeaderLevel , PST.peekControlMessageHeaderLength , PST.peekControlMessageHeaderType -- *** Poke , PST.pokeMessageHeaderName , PST.pokeMessageHeaderNameLength , PST.pokeMessageHeaderIOVector , PST.pokeMessageHeaderIOVectorLength , PST.pokeMessageHeaderControl , PST.pokeMessageHeaderControlLength , PST.pokeMessageHeaderFlags -- *** Metadata , PST.sizeofMessageHeader -- ** IO Vector -- *** Peek , PST.peekIOVectorBase , PST.peekIOVectorLength -- *** Poke , PST.pokeIOVectorBase , PST.pokeIOVectorLength -- *** Metadata , PST.sizeofIOVector ) where import GHC.ByteOrder (ByteOrder(BigEndian,LittleEndian),targetByteOrder) import GHC.IO (IO(..)) import Data.Primitive.Addr (Addr(..),plusAddr,nullAddr) import Data.Primitive (MutablePrimArray(..),MutableByteArray(..),ByteArray(..)) import Data.Primitive.Unlifted.Array (MutableUnliftedArray(..),UnliftedArray(..)) import Data.Primitive.ByteArray.Offset (MutableByteArrayOffset(..)) import Data.Primitive.PrimArray.Offset (MutablePrimArrayOffset(..)) import Data.Word (Word8,Word16,Word32,byteSwap16,byteSwap32) import Data.Void (Void) import Foreign.C.Error (Errno(Errno),getErrno) import Foreign.C.String (CString) import Foreign.C.Types (CInt(..),CSize(..)) import Foreign.Ptr (nullPtr) import GHC.Exts (Ptr,RealWorld,ByteArray#,MutableByteArray#) import GHC.Exts (Addr#,TYPE,RuntimeRep(UnliftedRep)) import GHC.Exts (ArrayArray#,MutableArrayArray#,Int(I#)) import GHC.Exts (shrinkMutableByteArray#,touch#) import Posix.Socket.Types (Family(..),Protocol(..),Type(..),SocketAddress(..)) import Posix.Socket.Types (SocketAddressInternet(..)) import Posix.Socket.Types (MessageFlags(..),Message(..),ShutdownType(..)) import Posix.Socket.Types (Level(..),OptionName(..),OptionValue(..)) import Posix.Socket.Types (AddressInfo) import System.Posix.Types (Fd(..),CSsize(..)) import qualified Posix.File as F import qualified Posix.Socket.Types as PST import qualified Data.Primitive as PM import qualified Data.Primitive.Unlifted.Array as PM import qualified Control.Monad.Primitive as PM import qualified GHC.Exts as Exts -- This module include operating-system specific code used -- to serialize some of various kind of socket address types. import qualified Posix.Socket.Platform as PSP -- getaddrinfo cannot use the unsafe ffi foreign import ccall safe "sys/socket.h getaddrinfo" c_safe_getaddrinfo :: CString -> CString -> Ptr AddressInfo -> MutableByteArray# RealWorld -- actually a `Ptr (Ptr AddressInfo))`. -> IO Errno -- | Free the @addrinfo@ at the pointer. foreign import ccall safe "sys/socket.h freeaddrinfo" uninterruptibleFreeAddressInfo :: Ptr AddressInfo -> IO () foreign import ccall unsafe "sys/socket.h socket" c_socket :: Family -> Type -> Protocol -> IO Fd foreign import ccall unsafe "sys/socket.h socketpair" c_socketpair :: Family -> Type -> Protocol -> MutableByteArray# RealWorld -> IO CInt foreign import ccall unsafe "sys/socket.h listen" c_listen :: Fd -> CInt -> IO CInt foreign import ccall unsafe "unistd.h shutdown" c_unsafe_shutdown :: Fd -> ShutdownType -> IO CInt -- Per the spec, the type signature of bind is: -- int bind(int socket, const struct sockaddr *address, socklen_t address_len); -- However, here we choose to represent the third argument as -- CInt rather than introducing a type corresponding to socklen_t. -- According to Linus Torvalds, "Any sane library must have socklen_t -- be the same size as int. Anything else breaks any BSD socket layer stuff." -- (https://yarchive.net/comp/linux/socklen_t.html). If a platform -- violates this assumption, this wrapper will be broken on that platform. foreign import ccall unsafe "sys/socket.h bind" c_bind :: Fd -> ByteArray# -> CInt -> IO CInt -- Per the spec, the type signature of accept is: -- int accept(int socket, struct sockaddr *restrict address, socklen_t *restrict address_len); -- The restrict keyword does not matter much for our purposes. See the -- note on c_bind for why we use CInt for socklen_t. Remember that the -- first bytearray argument is actually SocketAddress in the function that -- wraps this one. The second bytearray argument is a pointer to the size. foreign import ccall safe "sys/socket.h accept" c_safe_accept :: Fd -> MutableByteArray# RealWorld -- SocketAddress -> MutableByteArray# RealWorld -- Ptr CInt -> IO Fd foreign import ccall unsafe "sys/socket.h accept" c_unsafe_accept :: Fd -> MutableByteArray# RealWorld -- SocketAddress -> MutableByteArray# RealWorld -- Ptr CInt -> IO Fd -- This variant of accept is used when we do not care about the -- remote sockaddr. We pass null. foreign import ccall safe "sys/socket.h accept" c_safe_ptr_accept :: Fd -> Ptr Void -> Ptr CInt -> IO Fd foreign import ccall unsafe "sys/socket.h getsockname" c_unsafe_getsockname :: Fd -> MutableByteArray# RealWorld -- SocketAddress -> MutableByteArray# RealWorld -- Addr length (Ptr CInt) -> IO CInt foreign import ccall unsafe "sys/socket.h getsockopt" c_unsafe_getsockopt :: Fd -> Level -> OptionName -> MutableByteArray# RealWorld -- Option value -> MutableByteArray# RealWorld -- Option len (Ptr CInt) -> IO CInt foreign import ccall unsafe "sys/socket.h setsockopt_int" c_unsafe_setsockopt_int :: Fd -> Level -> OptionName -> CInt -- option_value -> IO CInt foreign import ccall unsafe "sys/socket.h setsockopt" c_unsafe_setsockopt :: Fd -> Level -> OptionName -> Ptr Void -- option_val -> CInt -- option_len -> IO CInt foreign import ccall unsafe "sys/socket.h setsockopt" c_unsafe_setsockopt_ba :: Fd -> Level -> OptionName -> ByteArray# -- option_val -> CInt -- option_len -> IO CInt -- Per the spec the type signature of connect is: -- int connect(int sockfd, const struct sockaddr *addr, socklen_t addrlen); -- The bytearray argument is actually SocketAddress. foreign import ccall safe "sys/socket.h connect" c_safe_connect :: Fd -> ByteArray# -> CInt -> IO CInt foreign import ccall safe "sys/socket.h connect" c_safe_mutablebytearray_connect :: Fd -> MutableByteArray# RealWorld -> CInt -> IO CInt foreign import ccall unsafe "sys/socket.h connect" c_unsafe_connect :: Fd -> ByteArray# -> CInt -> IO CInt -- There are several options for wrapping send. Both safe and unsafe -- are useful. Additionally, in the unsafe category, we also -- have the option of writing to either an address or a byte array. -- Unsafe FFI calls guarantee that byte arrays will not be relocated -- while the FFI call is taking place. Safe FFI calls do not have -- this guarantee, so internally we must be careful when using these to only -- provide pinned byte arrays as arguments. foreign import ccall safe "sys/socket.h send" c_safe_addr_send :: Fd -> Addr# -> CSize -> MessageFlags 'Send -> IO CSsize foreign import ccall safe "sys/socket.h send_offset" c_safe_bytearray_send :: Fd -> ByteArray# -> CInt -> CSize -> MessageFlags 'Send -> IO CSsize foreign import ccall safe "sys/socket.h send_offset" c_safe_mutablebytearray_send :: Fd -> MutableByteArray# RealWorld -> CInt -> CSize -> MessageFlags 'Send -> IO CSsize foreign import ccall safe "sys/socket.h send" c_safe_mutablebytearray_no_offset_send :: Fd -> MutableByteArray# RealWorld -> CSize -> MessageFlags 'Send -> IO CSsize foreign import ccall unsafe "sys/socket.h send" c_unsafe_addr_send :: Fd -> Addr# -> CSize -> MessageFlags 'Send -> IO CSsize foreign import ccall unsafe "sys/socket.h send_offset" c_unsafe_bytearray_send :: Fd -> ByteArray# -> CInt -> CSize -> MessageFlags 'Send -> IO CSsize foreign import ccall unsafe "sys/socket.h send_offset" c_unsafe_mutable_bytearray_send :: Fd -> MutableByteArray# RealWorld -> CInt -> CSize -> MessageFlags 'Send -> IO CSsize -- The ByteArray# (second to last argument) is a SocketAddress. foreign import ccall unsafe "sys/socket.h sendto_offset" c_unsafe_bytearray_sendto :: Fd -> ByteArray# -> CInt -> CSize -> MessageFlags 'Send -> ByteArray# -> CInt -> IO CSsize -- The ByteArray# (second to last argument) is a SocketAddress. foreign import ccall unsafe "sys/socket.h sendto_offset" c_unsafe_mutable_bytearray_sendto :: Fd -> MutableByteArray# RealWorld -> CInt -> CSize -> MessageFlags 'Send -> ByteArray# -> CInt -> IO CSsize foreign import ccall unsafe "sys/socket.h sendto_inet_offset" c_unsafe_mutable_bytearray_sendto_inet :: Fd -> MutableByteArray# RealWorld -> CInt -> CSize -> MessageFlags 'Send -> Word16 -> Word32 -> IO CSsize foreign import ccall unsafe "HaskellPosix.h sendto_inet_offset" c_unsafe_bytearray_sendto_inet :: Fd -> ByteArray# -> CInt -> CSize -> MessageFlags 'Send -> Word16 -> Word32 -> IO CSsize foreign import ccall unsafe "HaskellPosix.h sendto_inet_addr" c_unsafe_addr_sendto_inet :: Fd -> Addr# -> CSize -> MessageFlags 'Send -> Word16 -> Word32 -> IO CSsize foreign import ccall unsafe "HaskellPosix.h sendmsg_a" c_unsafe_sendmsg_a :: Fd -> Addr# -> CSize -> MutableByteArray# RealWorld -> Int -> CSize -> MessageFlags 'Send -> IO CSsize foreign import ccall unsafe "HaskellPosix.h sendmsg_b" c_unsafe_sendmsg_b :: Fd -> MutableByteArray# RealWorld -> Int -> CSize -> Addr# -> CSize -> MessageFlags 'Send -> IO CSsize foreign import ccall unsafe "HaskellPosix.h sendmsg_bytearrays" c_unsafe_sendmsg_bytearrays :: Fd -> ArrayArray# -> Int -> Int -> Int -> MessageFlags 'Send -> IO CSsize foreign import ccall safe "sys/uio.h writev" c_safe_writev :: Fd -> MutableByteArray# RealWorld -> CInt -> IO CSsize -- There are several ways to wrap recv. foreign import ccall safe "sys/socket.h recv" c_safe_addr_recv :: Fd -> Addr# -> CSize -> MessageFlags 'Receive -> IO CSsize foreign import ccall unsafe "sys/socket.h recv" c_unsafe_addr_recv :: Fd -> Addr# -> CSize -> MessageFlags 'Receive -> IO CSsize foreign import ccall unsafe "sys/socket.h recv_offset" c_unsafe_mutable_byte_array_recv :: Fd -> MutableByteArray# RealWorld -> CInt -> CSize -> MessageFlags 'Receive -> IO CSsize -- The last two arguments are SocketAddress and Ptr CInt. foreign import ccall unsafe "sys/socket.h recvfrom_offset" c_unsafe_mutable_byte_array_recvfrom :: Fd -> MutableByteArray# RealWorld -> CInt -> CSize -> MessageFlags 'Receive -> MutableByteArray# RealWorld -> MutableByteArray# RealWorld -> IO CSsize foreign import ccall unsafe "sys/socket.h recvfrom_offset_peerless" c_unsafe_mutable_byte_array_peerless_recvfrom :: Fd -> MutableByteArray# RealWorld -> CInt -> CSize -> MessageFlags 'Receive -> IO CSsize foreign import ccall unsafe "sys/socket.h recvfrom_addr_peerless" c_unsafe_addr_peerless_recvfrom :: Fd -> Addr# -> CSize -> MessageFlags 'Receive -> IO CSsize foreign import ccall unsafe "sys/socket.h recvfrom_offset_inet" c_unsafe_recvfrom_inet :: Fd -> MutableByteArray# RealWorld -> Int -> CSize -> MessageFlags 'Receive -> MutableByteArray# RealWorld -> Int -> IO CSsize foreign import ccall unsafe "sys/socket.h recvfrom_offset_inet_addr" c_unsafe_recvfrom_inet_addr :: Fd -> Addr# -> CSize -> MessageFlags 'Receive -> MutableByteArray# RealWorld -> Int -> IO CSsize foreign import ccall unsafe "sys/socket.h recvmsg" c_unsafe_addr_recvmsg :: Fd -> Addr# -- This addr is a pointer to msghdr -> MessageFlags 'Receive -> IO CSsize -- | Create an endpoint for communication, returning a file -- descriptor that refers to that endpoint. The -- -- includes more details. No special preparation is required before calling -- this function. The author believes that it cannot block for a prolonged -- period of time. uninterruptibleSocket :: Family -- ^ Communications domain (e.g. 'internet', 'unix') -> Type -- ^ Socket type (e.g. 'datagram', 'stream') with flags -> Protocol -- ^ Protocol -> IO (Either Errno Fd) uninterruptibleSocket dom typ prot = c_socket dom typ prot >>= errorsFromFd -- | Create an unbound pair of connected sockets in a specified domain, of -- a specified type, under the protocol optionally specified by the protocol -- argument. The -- includes more details. No special preparation is required before calling -- this function. The author believes that it cannot block for a prolonged -- period of time. uninterruptibleSocketPair :: Family -- ^ Communications domain (probably 'unix') -> Type -- ^ Socket type (e.g. 'datagram', 'stream') with flags -> Protocol -- ^ Protocol -> IO (Either Errno (Fd,Fd)) uninterruptibleSocketPair dom typ prot = do -- If this ever switches to the safe FFI, we will need to use -- a pinned array here instead. (sockets@(MutablePrimArray sockets#) :: MutablePrimArray RealWorld Fd) <- PM.newPrimArray 2 r <- c_socketpair dom typ prot sockets# if r == 0 then do fd1 <- PM.readPrimArray sockets 0 fd2 <- PM.readPrimArray sockets 1 pure (Right (fd1,fd2)) else fmap Left getErrno -- | Given node and service, which identify an Internet host and a service, -- @getaddrinfo()@ returns one or more @addrinfo@ structures. The type of this -- wrapper differs slightly from the type of its C counterpart. Remember to call -- 'uninterruptibleFreeAddressInfo' when finished with the result. getAddressInfo :: CString -- ^ Node, identifies an Internet host -> CString -- ^ Service -> Ptr AddressInfo -- ^ Hints -> IO (Either Errno (Ptr AddressInfo)) getAddressInfo !node !service !hints = do resBuf@(MutableByteArray resBuf#) <- PM.newPinnedByteArray (PM.sizeOf (undefined :: Ptr ())) c_safe_getaddrinfo node service hints resBuf# >>= \case Errno 0 -> do res <- PM.readByteArray resBuf 0 pure (Right res) e -> pure (Left e) -- | Assign a local socket address address to a socket identified by -- descriptor socket that has no local socket address assigned. The -- -- includes more details. The 'SocketAddress' represents the @sockaddr@ pointer argument, together -- with its @socklen_t@ size, as a byte array. This allows @bind@ to -- be used with @sockaddr@ extensions on various platforms. No special -- preparation is required before calling this function. The author -- believes that it cannot block for a prolonged period of time. uninterruptibleBind :: Fd -- ^ Socket -> SocketAddress -- ^ Socket address, extensible tagged union -> IO (Either Errno ()) uninterruptibleBind fd (SocketAddress b@(ByteArray b#)) = c_bind fd b# (intToCInt (PM.sizeofByteArray b)) >>= errorsFromInt_ -- | Mark the socket as a passive socket, that is, as a socket that -- will be used to accept incoming connection requests using @accept@. -- The -- includes more details. No special preparation is required before -- calling this function. The author believes that it cannot block -- for a prolonged period of time. uninterruptibleListen :: Fd -- ^ Socket -> CInt -- ^ Backlog -> IO (Either Errno ()) uninterruptibleListen fd backlog = c_listen fd backlog >>= errorsFromInt_ -- | Connect the socket to the specified socket address. -- The -- includes more details. connect :: Fd -- ^ Fd -> SocketAddress -- ^ Socket address, extensible tagged union -> IO (Either Errno ()) connect fd (SocketAddress sockAddr@(ByteArray sockAddr#)) = case isByteArrayPinned sockAddr of True -> c_safe_connect fd sockAddr# (intToCInt (PM.sizeofByteArray sockAddr)) >>= errorsFromInt_ False -> do let len = PM.sizeofByteArray sockAddr x@(MutableByteArray x#) <- PM.newPinnedByteArray len PM.copyByteArray x 0 sockAddr 0 len c_safe_mutablebytearray_connect fd x# (intToCInt len) >>= errorsFromInt_ -- | Connect the socket to the specified socket address. -- The -- includes more details. The only sensible way to use this is to -- give a nonblocking socket as the argument. uninterruptibleConnect :: Fd -- ^ Fd -> SocketAddress -- ^ Socket address, extensible tagged union -> IO (Either Errno ()) uninterruptibleConnect fd (SocketAddress sockAddr@(ByteArray sockAddr#)) = c_unsafe_connect fd sockAddr# (intToCInt (PM.sizeofByteArray sockAddr)) >>= errorsFromInt_ -- | Extract the first connection on the queue of pending connections. The -- -- includes more details. This function\'s type differs slightly from -- the specification: -- -- > int accept(int socket, struct sockaddr *restrict address, socklen_t *restrict address_len); -- -- Instead of requiring the caller to prepare buffers through which -- information is returned, this haskell binding to @accept@ prepares -- those buffers internally. This eschews C\'s characteristic buffer-passing -- in favor of the Haskell convention of allocating internally and returning. -- -- More specifically, this binding lacks an argument corresponding to the -- @sockaddr@ buffer from the specification. That mutable buffer is allocated -- internally, resized and frozen upon a success, and returned along with -- the file descriptor of the accepted socket. The size of this buffer is -- determined by the second argument (maximum socket address size). This -- size argument is also writen to the @address_len@ buffer, which is also -- allocated internally. The size returned through this pointer is used to -- resize the @sockaddr@ buffer, which is then frozen so that an immutable -- 'SocketAddress' is returned to the end user. -- -- For applications uninterested in the peer (described by @sockaddr@), -- POSIX @accept@ allows the null pointer to be passed as both @address@ and -- @address_len@. This behavior is provided by 'accept_'. accept :: Fd -- ^ Listening socket -> CInt -- ^ Maximum socket address size -> IO (Either Errno (CInt,SocketAddress,Fd)) -- ^ Peer information and connected socket accept !sock !maxSz = do sockAddrBuf@(MutableByteArray sockAddrBuf#) <- PM.newPinnedByteArray (cintToInt maxSz) lenBuf@(MutableByteArray lenBuf#) <- PM.newPinnedByteArray (PM.sizeOf (undefined :: CInt)) PM.writeByteArray lenBuf 0 maxSz r <- c_safe_accept sock sockAddrBuf# lenBuf# if r > (-1) then do (sz :: CInt) <- PM.readByteArray lenBuf 0 -- Why copy when we could just shrink? We want to always return -- byte arrays that are not explicitly pinned. let minSz = min sz maxSz x <- PM.newByteArray (cintToInt minSz) PM.copyMutableByteArray x 0 sockAddrBuf 0 (cintToInt minSz) sockAddr <- PM.unsafeFreezeByteArray x pure (Right (sz,SocketAddress sockAddr,r)) else fmap Left getErrno -- | See 'accept'. This uses the unsafe FFI. Consequently, it does not -- not need to allocate pinned memory. It only makes sense to call this -- on a nonblocking socket. uninterruptibleAccept :: Fd -- ^ Listening socket -> CInt -- ^ Maximum socket address size -> IO (Either Errno (CInt,SocketAddress,Fd)) -- ^ Peer information and connected socket uninterruptibleAccept !sock !maxSz = do sockAddrBuf@(MutableByteArray sockAddrBuf#) <- PM.newByteArray (cintToInt maxSz) lenBuf@(MutableByteArray lenBuf#) <- PM.newByteArray (PM.sizeOf (undefined :: CInt)) PM.writeByteArray lenBuf 0 maxSz r <- c_unsafe_accept sock sockAddrBuf# lenBuf# if r > (-1) then do (sz :: CInt) <- PM.readByteArray lenBuf 0 if sz < maxSz then shrinkMutableByteArray sockAddrBuf (cintToInt sz) else pure () sockAddr <- PM.unsafeFreezeByteArray sockAddrBuf pure (Right (sz,SocketAddress sockAddr,r)) else fmap Left getErrno -- | A variant of 'accept' that does not provide the user with a -- 'SocketAddress' detailing the peer. accept_ :: Fd -- ^ Listening socket -> IO (Either Errno Fd) -- ^ Connected socket accept_ sock = c_safe_ptr_accept sock nullPtr nullPtr >>= errorsFromFd -- | Retrieve the locally-bound name of the specified socket. The -- -- of @getsockname@ includes more details. uninterruptibleGetSocketName :: Fd -- ^ Socket -> CInt -- ^ Maximum socket address size -> IO (Either Errno (CInt,SocketAddress)) uninterruptibleGetSocketName sock maxSz = do sockAddrBuf@(MutableByteArray sockAddrBuf#) <- PM.newByteArray (cintToInt maxSz) lenBuf@(MutableByteArray lenBuf#) <- PM.newByteArray (PM.sizeOf (undefined :: CInt)) PM.writeByteArray lenBuf 0 maxSz r <- c_unsafe_getsockname sock sockAddrBuf# lenBuf# if r == 0 then do (sz :: CInt) <- PM.readByteArray lenBuf 0 if sz < maxSz then shrinkMutableByteArray sockAddrBuf (cintToInt sz) else pure () sockAddr <- PM.unsafeFreezeByteArray sockAddrBuf pure (Right (sz,SocketAddress sockAddr)) else fmap Left getErrno -- | Retrieve the value for the option specified by the 'Option' argument for -- the socket specified by the 'Fd' argument. The -- -- of @getsockopt@ includes more details. uninterruptibleGetSocketOption :: Fd -- ^ Socket -> Level -- ^ Socket level -> OptionName -- Option name -> CInt -- ^ Maximum option value size -> IO (Either Errno (CInt,OptionValue)) uninterruptibleGetSocketOption sock level optName maxSz = do valueBuf@(MutableByteArray valueBuf#) <- PM.newByteArray (cintToInt maxSz) lenBuf@(MutableByteArray lenBuf#) <- PM.newByteArray (PM.sizeOf (undefined :: CInt)) PM.writeByteArray lenBuf 0 maxSz r <- c_unsafe_getsockopt sock level optName valueBuf# lenBuf# if r == 0 then do (sz :: CInt) <- PM.readByteArray lenBuf 0 if sz < maxSz then shrinkMutableByteArray valueBuf (cintToInt sz) else pure () value <- PM.unsafeFreezeByteArray valueBuf pure (Right (sz,OptionValue value)) else fmap Left getErrno -- | Set the value for the option specified by the 'Option' argument for -- the socket specified by the 'Fd' argument. The -- -- of @getsockopt@ includes more details. This variant requires that the -- size of the @option_value@ -- be the same as the size of 'CInt'. That is, the @option_name@ must -- describe an option that is represented by a C integer. This is a -- common case, so we avoid allocations by reference-passing in C. uninterruptibleSetSocketOptionInt :: Fd -- ^ Socket -> Level -- ^ Socket level -> OptionName -- ^ Option name -> CInt -- ^ Option value -> IO (Either Errno ()) uninterruptibleSetSocketOptionInt sock level optName optValue = c_unsafe_setsockopt_int sock level optName optValue >>= errorsFromInt_ -- | Set the value for the option specified by the 'Option' argument for -- the socket specified by the 'Fd' argument. The -- -- of @getsockopt@ includes more details. uninterruptibleSetSocketOption :: Fd -- ^ Socket -> Level -- ^ Socket level -> OptionName -- ^ Option name -> Ptr Void -- ^ Option value -> CInt -- ^ Option value length -> IO (Either Errno ()) uninterruptibleSetSocketOption sock level optName optValue optLen = c_unsafe_setsockopt sock level optName optValue optLen >>= errorsFromInt_ -- | Variant of 'uninterruptibleSetSocketOption' that accepts the option -- as a byte array instead of a pointer into unmanaged memory. The argument -- does not need to be pinned. uninterruptibleSetSocketOptionByteArray :: Fd -- ^ Socket -> Level -- ^ Socket level -> OptionName -- ^ Option name -> ByteArray -- ^ Option value -> CInt -- ^ Option value length -> IO (Either Errno ()) uninterruptibleSetSocketOptionByteArray sock level optName (ByteArray optVal) optLen = c_unsafe_setsockopt_ba sock level optName optVal optLen >>= errorsFromInt_ -- | Send data from a byte array over a network socket. Users -- may specify an offset and a length to send fewer bytes than are -- actually present in the array. Since this uses the safe -- FFI, it allocates a pinned copy of the bytearry if it was not -- already pinned. sendByteArray :: Fd -- ^ Socket -> ByteArray -- ^ Source byte array -> CInt -- ^ Offset into source array -> CSize -- ^ Length in bytes -> MessageFlags 'Send -- ^ Flags -> IO (Either Errno CSize) -- ^ Number of bytes pushed to send buffer sendByteArray fd b@(ByteArray b#) off len flags = if isByteArrayPinned b then errorsFromSize =<< c_safe_bytearray_send fd b# off len flags else do x@(MutableByteArray x#) <- PM.newPinnedByteArray (csizeToInt len) PM.copyByteArray x (cintToInt off) b 0 (csizeToInt len) errorsFromSize =<< c_safe_mutablebytearray_no_offset_send fd x# len flags -- | Write data from multiple byte arrays to the file/socket associated -- with the file descriptor. This does not support slicing. The -- -- of @writev@ includes more details. writeVector :: Fd -- ^ Socket -> UnliftedArray ByteArray -- ^ Source byte arrays -> IO (Either Errno CSize) writeVector fd buffers = do iovecs@(MutableByteArray iovecs#) :: MutableByteArray RealWorld <- PM.newPinnedByteArray (cintToInt PST.sizeofIOVector * PM.sizeofUnliftedArray buffers) -- We construct a list of the new buffers for the sole purpose -- of ensuring that we can touch the list later to keep all -- the new buffers live. newBufs <- foldDownward (PM.sizeofUnliftedArray buffers) UNil $ \newBufs i -> do let !buf = PM.indexUnliftedArray buffers i pinByteArray buf >>= \case Nothing -> do let buffer = buf let targetAddr :: Addr targetAddr = ptrToAddr (PM.mutableByteArrayContents iovecs) `plusAddr` (i * cintToInt PST.sizeofIOVector) PST.pokeIOVectorBase targetAddr (ptrToAddr (PM.byteArrayContents buffer)) PST.pokeIOVectorLength targetAddr (intToCSize (PM.sizeofByteArray buffer)) pure newBufs Just buffer -> do let targetAddr :: Addr targetAddr = ptrToAddr (PM.mutableByteArrayContents iovecs) `plusAddr` (i * cintToInt PST.sizeofIOVector) PST.pokeIOVectorBase targetAddr (ptrToAddr (PM.byteArrayContents buffer)) PST.pokeIOVectorLength targetAddr (intToCSize (PM.sizeofByteArray buffer)) pure (UCons (unByteArray buffer) newBufs) r <- errorsFromSize =<< c_safe_writev fd iovecs# (intToCInt (PM.sizeofUnliftedArray buffers)) -- Touching both the unlifted array and the list of new buffers -- here is crucial to ensuring that -- the buffers do not get GCed before c_safe_writev. Just touching -- them should keep all of their children alive too. touchUnliftedArray buffers touchLifted newBufs pure r data UList (a :: TYPE 'UnliftedRep) where UNil :: UList a UCons :: a -> UList a -> UList a -- Internal function. Fold with strict accumulator. Upper bound is exclusive. -- Hits every int in the range [0,hi) from highest to lowest. foldDownward :: forall a. Int -> a -> (a -> Int -> IO a) -> IO a {-# INLINE foldDownward #-} foldDownward !hi !a0 f = go (hi - 1) a0 where go :: Int -> a -> IO a go !ix !a = if ix >= 0 then f a ix >>= go (ix - 1) else pure a -- | Copy and pin a byte array if, it's not already pinned. pinByteArray :: ByteArray -> IO (Maybe ByteArray) {-# INLINE pinByteArray #-} pinByteArray byteArray = if isByteArrayPinned byteArray then pure Nothing else do pinnedByteArray <- PM.newPinnedByteArray len PM.copyByteArray pinnedByteArray 0 byteArray 0 len r <- PM.unsafeFreezeByteArray pinnedByteArray pure (Just r) where len = PM.sizeofByteArray byteArray -- | Send two payloads (one from unmanaged memory and one from -- managed memory) over a network socket. uninterruptibleSendMessageA :: Fd -- ^ Socket -> Addr -- ^ Source address (payload A) -> CSize -- ^ Length in bytes (payload A) -> MutableByteArrayOffset RealWorld -- ^ Source and offset (payload B) -> CSize -- ^ Length in bytes (payload B) -> MessageFlags 'Send -- ^ Flags -> IO (Either Errno CSize) -- ^ Number of bytes pushed to send buffer uninterruptibleSendMessageA fd (Addr addr) lenA (MutableByteArrayOffset{array,offset}) lenB flags = c_unsafe_sendmsg_a fd addr lenA (unMba array) offset lenB flags >>= errorsFromSize -- | Send two payloads (one from managed memory and one from -- unmanaged memory) over a network socket. uninterruptibleSendMessageB :: Fd -- ^ Socket -> MutableByteArrayOffset RealWorld -- ^ Source and offset (payload B) -> CSize -- ^ Length in bytes (payload B) -> Addr -- ^ Source address (payload A) -> CSize -- ^ Length in bytes (payload A) -> MessageFlags 'Send -- ^ Flags -> IO (Either Errno CSize) -- ^ Number of bytes pushed to send buffer uninterruptibleSendMessageB fd (MutableByteArrayOffset{array,offset}) lenB (Addr addr) lenA flags = c_unsafe_sendmsg_b fd (unMba array) offset lenB addr lenA flags >>= errorsFromSize -- | Send many immutable byte arrays with @sendmsg@. -- This accepts a slice into the chunks. Additionally, -- this accepts an offset into the first chunk. uninterruptibleSendByteArrays :: Fd -- ^ Socket -> UnliftedArray ByteArray -- ^ Byte arrays -> Int -- ^ Offset into byte array chunks -> Int -- ^ Number of chunks to send -> Int -- ^ Offset into first chunk -> MessageFlags 'Send -> IO (Either Errno CSize) {-# inline uninterruptibleSendByteArrays #-} uninterruptibleSendByteArrays !fd (UnliftedArray arrs) off !len !offC !flags = c_unsafe_sendmsg_bytearrays fd arrs off len offC flags >>= errorsFromSize -- | Send data from a mutable byte array over a network socket. Users -- may specify an offset and a length to send fewer bytes than are -- actually present in the array. Since this uses the safe -- FFI, it allocates a pinned copy of the bytearry if it was not -- already pinned. sendMutableByteArray :: Fd -- ^ Socket -> MutableByteArray RealWorld -- ^ Source byte array -> CInt -- ^ Offset into source array -> CSize -- ^ Length in bytes -> MessageFlags 'Send -- ^ Flags -> IO (Either Errno CSize) -- ^ Number of bytes pushed to send buffer sendMutableByteArray fd b@(MutableByteArray b#) off len flags = if isMutableByteArrayPinned b then errorsFromSize =<< c_safe_mutablebytearray_send fd b# off len flags else do x@(MutableByteArray x#) <- PM.newPinnedByteArray (csizeToInt len) PM.copyMutableByteArray x (cintToInt off) b 0 (csizeToInt len) errorsFromSize =<< c_safe_mutablebytearray_no_offset_send fd x# len flags -- | Send data from an address over a network socket. This is not guaranteed -- to send the entire length. This uses the safe FFI since -- it may block indefinitely. send :: Fd -- ^ Connected socket -> Addr -- ^ Source address -> CSize -- ^ Length in bytes -> MessageFlags 'Send -- ^ Flags -> IO (Either Errno CSize) -- ^ Number of bytes pushed to send buffer send fd (Addr addr) len flags = c_safe_addr_send fd addr len flags >>= errorsFromSize -- | Send data from an address over a network socket. This uses the unsafe FFI. -- Users of this function should be sure to set flags that prohibit this -- from blocking. On Linux this is accomplished with @O_NONBLOCK@. It is -- often desirable to call 'threadWaitWrite' on a nonblocking socket before -- calling @unsafeSend@ on it. uninterruptibleSend :: Fd -- ^ Socket -> Addr -- ^ Source address -> CSize -- ^ Length in bytes -> MessageFlags 'Send -- ^ Flags -> IO (Either Errno CSize) -- ^ Number of bytes pushed to send buffer uninterruptibleSend fd (Addr addr) len flags = c_unsafe_addr_send fd addr len flags >>= errorsFromSize -- | Send data from a byte array over a network socket. This uses the unsafe FFI; -- considerations pertaining to 'sendUnsafe' apply to this function as well. Users -- may specify a length to send fewer bytes than are actually present in the -- array. uninterruptibleSendByteArray :: Fd -- ^ Socket -> ByteArray -- ^ Source byte array -> CInt -- ^ Offset into source array -> CSize -- ^ Length in bytes -> MessageFlags 'Send -- ^ Flags -> IO (Either Errno CSize) -- ^ Number of bytes pushed to send buffer uninterruptibleSendByteArray fd (ByteArray b) off len flags = c_unsafe_bytearray_send fd b off len flags >>= errorsFromSize -- | Send data from a mutable byte array over a network socket. This uses the unsafe FFI; -- considerations pertaining to 'sendUnsafe' apply to this function as well. Users -- specify an offset and a length to send fewer bytes than are actually present in the -- array. uninterruptibleSendMutableByteArray :: Fd -- ^ Socket -> MutableByteArray RealWorld -- ^ Source mutable byte array -> CInt -- ^ Offset into source array -> CSize -- ^ Length in bytes -> MessageFlags 'Send -- ^ Flags -> IO (Either Errno CSize) -- ^ Number of bytes pushed to send buffer uninterruptibleSendMutableByteArray fd (MutableByteArray b) off len flags = c_unsafe_mutable_bytearray_send fd b off len flags >>= errorsFromSize -- | Send data from a byte array over an unconnected network socket. -- This uses the unsafe FFI; considerations pertaining to 'sendToUnsafe' -- apply to this function as well. The offset and length arguments -- cause a slice of the byte array to be sent rather than the entire -- byte array. uninterruptibleSendToByteArray :: Fd -- ^ Socket -> ByteArray -- ^ Source byte array -> CInt -- ^ Offset into source array -> CSize -- ^ Length in bytes -> MessageFlags 'Send -- ^ Flags -> SocketAddress -- ^ Socket Address -> IO (Either Errno CSize) -- ^ Number of bytes pushed to send buffer uninterruptibleSendToByteArray fd (ByteArray b) off len flags (SocketAddress a@(ByteArray a#)) = c_unsafe_bytearray_sendto fd b off len flags a# (intToCInt (PM.sizeofByteArray a)) >>= errorsFromSize -- | Variant of 'uninterruptibleSendToByteArray' that requires -- that @sockaddr_in@ be used as the socket address. This is used to -- avoid allocating a buffer for the socket address when the caller -- knows in advance that they are sending to an IPv4 address. uninterruptibleSendToInternetByteArray :: Fd -- ^ Socket -> ByteArray -- ^ Source byte array -> CInt -- ^ Offset into source array -> CSize -- ^ Length in bytes -> MessageFlags 'Send -- ^ Flags -> SocketAddressInternet -- ^ Socket Address -> IO (Either Errno CSize) -- ^ Number of bytes pushed to send buffer uninterruptibleSendToInternetByteArray fd (ByteArray b) off len flags (SocketAddressInternet{port,address}) = c_unsafe_bytearray_sendto_inet fd b off len flags port address >>= errorsFromSize -- | Variant of 'uninterruptibleSendToByteArray' that requires -- that @sockaddr_in@ be used as the socket address. This is used to -- avoid allocating a buffer for the socket address when the caller -- knows in advance that they are sending to an IPv4 address. uninterruptibleSendToInternet :: Fd -- ^ Socket -> Addr -- ^ Source byte array -> CSize -- ^ Length in bytes -> MessageFlags 'Send -- ^ Flags -> SocketAddressInternet -- ^ Socket Address -> IO (Either Errno CSize) -- ^ Number of bytes pushed to send buffer uninterruptibleSendToInternet fd (Addr b) len flags (SocketAddressInternet{port,address}) = c_unsafe_addr_sendto_inet fd b len flags port address >>= errorsFromSize -- | Send data from a mutable byte array over an unconnected network socket. -- This uses the unsafe FFI; concerns pertaining to 'uninterruptibleSend' -- apply to this function as well. The offset and length arguments -- cause a slice of the mutable byte array to be sent rather than the entire -- byte array. uninterruptibleSendToMutableByteArray :: Fd -- ^ Socket -> MutableByteArray RealWorld -- ^ Source byte array -> CInt -- ^ Offset into source array -> CSize -- ^ Length in bytes -> MessageFlags 'Send -- ^ Flags -> SocketAddress -- ^ Socket Address -> IO (Either Errno CSize) -- ^ Number of bytes pushed to send buffer uninterruptibleSendToMutableByteArray fd (MutableByteArray b) off len flags (SocketAddress a@(ByteArray a#)) = c_unsafe_mutable_bytearray_sendto fd b off len flags a# (intToCInt (PM.sizeofByteArray a)) >>= errorsFromSize -- | Variant of 'uninterruptibleSendToMutableByteArray' that requires -- that @sockaddr_in@ be used as the socket address. This is used to -- avoid allocating a buffer for the socket address when the caller -- knows in advance that they are sending to an IPv4 address. uninterruptibleSendToInternetMutableByteArray :: Fd -- ^ Socket -> MutableByteArray RealWorld -- ^ Source byte array -> CInt -- ^ Offset into source array -> CSize -- ^ Length in bytes -> MessageFlags 'Send -- ^ Flags -> SocketAddressInternet -- ^ Socket Address -> IO (Either Errno CSize) -- ^ Number of bytes pushed to send buffer uninterruptibleSendToInternetMutableByteArray fd (MutableByteArray b) off len flags (SocketAddressInternet{port,address}) = c_unsafe_mutable_bytearray_sendto_inet fd b off len flags port address >>= errorsFromSize -- | Receive data into an address from a network socket. This wraps @recv@ using -- the safe FFI. When the returned size is zero, there are no -- additional bytes to receive and the peer has performed an orderly shutdown. receive :: Fd -- ^ Socket -> Addr -- ^ Source address -> CSize -- ^ Length in bytes -> MessageFlags 'Receive -- ^ Flags -> IO (Either Errno CSize) receive fd (Addr addr) len flags = c_safe_addr_recv fd addr len flags >>= errorsFromSize -- | Receive data into a byte array from a network socket. This wraps @recv@ using -- the safe FFI. When the returned size is zero, there are no -- additional bytes to receive and the peer has performed an orderly shutdown. receiveByteArray :: Fd -- ^ Socket -> CSize -- ^ Length in bytes -> MessageFlags 'Receive -- ^ Flags -> IO (Either Errno ByteArray) receiveByteArray !fd !len !flags = do m <- PM.newPinnedByteArray (csizeToInt len) let !(Addr addr) = ptrToAddr (PM.mutableByteArrayContents m) r <- c_safe_addr_recv fd addr len flags if r /= (-1) then do -- Why copy when we could just shrink? We want to always return -- byte arrays that are not explicitly pinned. let sz = cssizeToInt r x <- PM.newByteArray sz PM.copyMutableByteArray x 0 m 0 sz a <- PM.unsafeFreezeByteArray x pure (Right a) else fmap Left getErrno -- | Receive data into an address from a network socket. This wraps @recv@ -- using the unsafe FFI. Users of this function should be sure to set flags -- that prohibit this from blocking. On Linux this is accomplished by setting -- the @MSG_DONTWAIT@ flag and handling the resulting @EAGAIN@ or -- @EWOULDBLOCK@. When the returned size is zero, there are no additional -- bytes to receive and the peer has performed an orderly shutdown. uninterruptibleReceive :: Fd -- ^ Socket -> Addr -- ^ Source address -> CSize -- ^ Length in bytes -> MessageFlags 'Receive -- ^ Flags -> IO (Either Errno CSize) {-# inline uninterruptibleReceive #-} uninterruptibleReceive !fd (Addr !addr) !len !flags = c_unsafe_addr_recv fd addr len flags >>= errorsFromSize -- | Receive data into an address from a network socket. This uses the unsafe -- FFI; considerations pertaining to 'receiveUnsafe' apply to this function -- as well. Users may specify a length to receive fewer bytes than are -- actually present in the mutable byte array. uninterruptibleReceiveMutableByteArray :: Fd -- ^ Socket -> MutableByteArray RealWorld -- ^ Destination byte array -> CInt -- ^ Destination offset -> CSize -- ^ Maximum bytes to receive -> MessageFlags 'Receive -- ^ Flags -> IO (Either Errno CSize) -- ^ Bytes received into array {-# inline uninterruptibleReceiveMutableByteArray #-} uninterruptibleReceiveMutableByteArray !fd (MutableByteArray !b) !off !len !flags = c_unsafe_mutable_byte_array_recv fd b off len flags >>= errorsFromSize -- | Receive data into an address from an unconnected network socket. This -- uses the unsafe FFI. Users may specify an offset into the destination -- byte array. This function does not resize the buffer. uninterruptibleReceiveFromMutableByteArray :: Fd -- ^ Socket -> MutableByteArray RealWorld -- ^ Destination byte array -> CInt -- ^ Destination offset -> CSize -- ^ Maximum bytes to receive -> MessageFlags 'Receive -- ^ Flags -> CInt -- ^ Maximum socket address size -> IO (Either Errno (CInt,SocketAddress,CSize)) -- ^ Remote host, bytes received into array, bytes needed for @addrlen@. {-# inline uninterruptibleReceiveFromMutableByteArray #-} -- GHC does not inline this unless we give it the pragma. We really -- want this to inline since inlining typically avoids the Left/Right -- data constructor allocation. uninterruptibleReceiveFromMutableByteArray !fd (MutableByteArray !b) !off !len !flags !maxSz = do -- TODO: We currently allocate one buffer for the size and -- one for the peer. We could improve this by allocating -- a single buffer instead. We would need to add some -- cleverness in the cbits directory. sockAddrBuf@(MutableByteArray sockAddrBuf#) <- PM.newByteArray (cintToInt maxSz) lenBuf@(MutableByteArray lenBuf#) <- PM.newByteArray (PM.sizeOf (undefined :: CInt)) PM.writeByteArray lenBuf 0 maxSz r <- c_unsafe_mutable_byte_array_recvfrom fd b off len flags sockAddrBuf# lenBuf# if r > (-1) then do (sz :: CInt) <- PM.readByteArray lenBuf 0 if sz < maxSz then shrinkMutableByteArray sockAddrBuf (cintToInt sz) else pure () sockAddr <- PM.unsafeFreezeByteArray sockAddrBuf pure (Right (sz,SocketAddress sockAddr,cssizeToCSize r)) else fmap Left getErrno uninterruptibleReceiveFromInternet :: Fd -- ^ Socket -> Addr -- ^ Destination byte array -> CSize -- ^ Maximum bytes to receive -> MessageFlags 'Receive -- ^ Flags -> MutablePrimArrayOffset RealWorld SocketAddressInternet -- ^ Address -> IO (Either Errno CSize) -- ^ Number of bytes received into array {-# inline uninterruptibleReceiveFromInternet #-} uninterruptibleReceiveFromInternet !fd (Addr b) !len !flags (MutablePrimArrayOffset (MutablePrimArray sockAddrBuf) addrOff) = c_unsafe_recvfrom_inet_addr fd b len flags sockAddrBuf addrOff >>= errorsFromSize uninterruptibleReceiveFromInternetMutableByteArray :: Fd -- ^ Socket -> MutableByteArrayOffset RealWorld -- ^ Destination byte array -> CSize -- ^ Maximum bytes to receive -> MessageFlags 'Receive -- ^ Flags -> MutablePrimArrayOffset RealWorld SocketAddressInternet -- ^ Address -> IO (Either Errno CSize) -- ^ Number of bytes received into array {-# inline uninterruptibleReceiveFromInternetMutableByteArray #-} uninterruptibleReceiveFromInternetMutableByteArray !fd (MutableByteArrayOffset (MutableByteArray b) off) !len !flags (MutablePrimArrayOffset (MutablePrimArray sockAddrBuf) addrOff) = c_unsafe_recvfrom_inet fd b off len flags sockAddrBuf addrOff >>= errorsFromSize -- | Receive data into an address from a network socket. This uses the unsafe -- FFI. This does not return the socket address of the remote host that -- sent the packet received. uninterruptibleReceiveFromMutableByteArray_ :: Fd -- ^ Socket -> MutableByteArray RealWorld -- ^ Destination byte array -> CInt -- ^ Destination offset -> CSize -- ^ Maximum bytes to receive -> MessageFlags 'Receive -- ^ Flags -> IO (Either Errno CSize) -- ^ Number of bytes received into array {-# inline uninterruptibleReceiveFromMutableByteArray_ #-} uninterruptibleReceiveFromMutableByteArray_ !fd (MutableByteArray !b) !off !len !flags = c_unsafe_mutable_byte_array_peerless_recvfrom fd b off len flags >>= errorsFromSize -- | Receive data into an address from a network socket. This uses the unsafe -- FFI. This does not return the socket address of the remote host that -- sent the packet received. uninterruptibleReceiveFrom_ :: Fd -- ^ Socket -> Addr -- ^ Destination byte array -> CSize -- ^ Maximum bytes to receive -> MessageFlags 'Receive -- ^ Flags -> IO (Either Errno CSize) -- ^ Number of bytes received into array {-# inline uninterruptibleReceiveFrom_ #-} uninterruptibleReceiveFrom_ !fd (Addr !b) !len !flags = c_unsafe_addr_peerless_recvfrom fd b len flags >>= errorsFromSize -- | Receive a message, scattering the input. This does not provide -- the socket address or the control messages. All of the chunks -- must have the same maximum size. All resulting byte arrays have -- been explicitly pinned. uninterruptibleReceiveMessageA :: Fd -- ^ Socket -> CSize -- ^ Maximum bytes per chunk -> CSize -- ^ Maximum number of chunks -> MessageFlags 'Receive -- ^ Flags -> IO (Either Errno (CSize,UnliftedArray ByteArray)) uninterruptibleReceiveMessageA !s !chunkSize !chunkCount !flags = do bufs <- PM.unsafeNewUnliftedArray (csizeToInt chunkCount) iovecsBuf <- PM.newPinnedByteArray (csizeToInt chunkCount * cintToInt PST.sizeofIOVector) let iovecsAddr = ptrToAddr (PM.mutableByteArrayContents iovecsBuf) initializeIOVectors bufs iovecsAddr chunkSize chunkCount msgHdrBuf <- PM.newPinnedByteArray (cintToInt PST.sizeofMessageHeader) let !msgHdrAddr@(Addr msgHdrAddr#) = ptrToAddr (PM.mutableByteArrayContents msgHdrBuf) pokeMessageHeader msgHdrAddr nullAddr 0 iovecsAddr chunkCount nullAddr 0 flags r <- c_unsafe_addr_recvmsg s msgHdrAddr# flags if r > (-1) then do filled <- countAndShrinkIOVectors (csizeToInt chunkCount) (cssizeToInt r) (csizeToInt chunkSize) bufs frozenBufs <- deepFreezeIOVectors filled bufs touchMutableUnliftedArray bufs touchMutableByteArray iovecsBuf touchMutableByteArray msgHdrBuf pure (Right (cssizeToCSize r,frozenBufs)) else do touchMutableUnliftedArray bufs touchMutableByteArray iovecsBuf touchMutableByteArray msgHdrBuf fmap Left getErrno ptrToAddr :: Ptr Word8 -> Addr ptrToAddr (Exts.Ptr a) = Addr a -- | Receive a message, scattering the input. This provides the socket -- address but does not include control messages. All of the chunks -- must have the same maximum size. All resulting byte arrays have -- been explicitly pinned. uninterruptibleReceiveMessageB :: Fd -- ^ Socket -> CSize -- ^ Maximum bytes per chunk -> CSize -- ^ Maximum number of chunks -> MessageFlags 'Receive -- ^ Flags -> CInt -- ^ Maximum socket address size -> IO (Either Errno (CInt,SocketAddress,CSize,UnliftedArray ByteArray)) uninterruptibleReceiveMessageB !s !chunkSize !chunkCount !flags !maxSockAddrSz = do sockAddrBuf <- PM.newPinnedByteArray (cintToInt maxSockAddrSz) bufs <- PM.unsafeNewUnliftedArray (csizeToInt chunkCount) iovecsBuf <- PM.newPinnedByteArray (csizeToInt chunkCount * cintToInt PST.sizeofIOVector) let iovecsAddr = ptrToAddr (PM.mutableByteArrayContents iovecsBuf) initializeIOVectors bufs iovecsAddr chunkSize chunkCount msgHdrBuf <- PM.newPinnedByteArray (cintToInt PST.sizeofMessageHeader) let !msgHdrAddr@(Addr msgHdrAddr#) = ptrToAddr (PM.mutableByteArrayContents msgHdrBuf) pokeMessageHeader msgHdrAddr (ptrToAddr (PM.mutableByteArrayContents sockAddrBuf)) maxSockAddrSz iovecsAddr chunkCount nullAddr 0 flags r <- c_unsafe_addr_recvmsg s msgHdrAddr# flags if r > (-1) then do actualSockAddrSz <- PST.peekMessageHeaderNameLength msgHdrAddr if actualSockAddrSz < maxSockAddrSz then shrinkMutableByteArray sockAddrBuf (cintToInt actualSockAddrSz) else pure () sockAddr <- PM.unsafeFreezeByteArray sockAddrBuf filled <- countAndShrinkIOVectors (csizeToInt chunkCount) (cssizeToInt r) (csizeToInt chunkSize) bufs frozenBufs <- deepFreezeIOVectors filled bufs touchMutableUnliftedArray bufs touchMutableByteArray iovecsBuf touchMutableByteArray msgHdrBuf touchMutableByteArray sockAddrBuf pure (Right (actualSockAddrSz,SocketAddress sockAddr,cssizeToCSize r,frozenBufs)) else do touchMutableUnliftedArray bufs touchMutableByteArray iovecsBuf touchMutableByteArray msgHdrBuf touchMutableByteArray sockAddrBuf fmap Left getErrno -- | Shutdown a socket. This uses the unsafe FFI. uninterruptibleShutdown :: Fd -> ShutdownType -> IO (Either Errno ()) uninterruptibleShutdown fd typ = c_unsafe_shutdown fd typ >>= errorsFromInt_ errorsFromSize :: CSsize -> IO (Either Errno CSize) errorsFromSize r = if r > (-1) then pure (Right (cssizeToCSize r)) else fmap Left getErrno errorsFromFd :: Fd -> IO (Either Errno Fd) errorsFromFd r = if r > (-1) then pure (Right r) else fmap Left getErrno -- Sometimes, functions that return an int use zero to indicate -- success and negative one to indicate failure without including -- additional information in the value. errorsFromInt_ :: CInt -> IO (Either Errno ()) errorsFromInt_ r = if r == 0 then pure (Right ()) else fmap Left getErrno intToCInt :: Int -> CInt intToCInt = fromIntegral intToCSize :: Int -> CSize intToCSize = fromIntegral cintToInt :: CInt -> Int cintToInt = fromIntegral csizeToInt :: CSize -> Int csizeToInt = fromIntegral cssizeToInt :: CSsize -> Int cssizeToInt = fromIntegral -- only call this when it is known that the argument is non-negative cssizeToCSize :: CSsize -> CSize cssizeToCSize = fromIntegral shrinkMutableByteArray :: MutableByteArray RealWorld -> Int -> IO () shrinkMutableByteArray (MutableByteArray arr) (I# sz) = PM.primitive_ (shrinkMutableByteArray# arr sz) -- | Convert a 16-bit word from host to network byte order (e.g. @htons@). hostToNetworkShort :: Word16 -> Word16 hostToNetworkShort = case targetByteOrder of BigEndian -> id LittleEndian -> byteSwap16 -- | Convert a 16-bit word from network to host byte order (e.g. @ntohs@). networkToHostShort :: Word16 -> Word16 networkToHostShort = case targetByteOrder of BigEndian -> id LittleEndian -> byteSwap16 -- | Convert a 32-bit word from host to network byte order (e.g. @htonl@). hostToNetworkLong :: Word32 -> Word32 hostToNetworkLong = case targetByteOrder of BigEndian -> id LittleEndian -> byteSwap32 -- | Convert a 32-bit word from network to host byte order (e.g. @ntohl@). networkToHostLong :: Word32 -> Word32 networkToHostLong = case targetByteOrder of BigEndian -> id LittleEndian -> byteSwap32 pokeMessageHeader :: Addr -> Addr -> CInt -> Addr -> CSize -> Addr -> CSize -> MessageFlags 'Receive -> IO () pokeMessageHeader msgHdrAddr a b c d e f g = do PST.pokeMessageHeaderName msgHdrAddr a PST.pokeMessageHeaderNameLength msgHdrAddr b PST.pokeMessageHeaderIOVector msgHdrAddr c PST.pokeMessageHeaderIOVectorLength msgHdrAddr d PST.pokeMessageHeaderControl msgHdrAddr e PST.pokeMessageHeaderControlLength msgHdrAddr f PST.pokeMessageHeaderFlags msgHdrAddr g -- This sets up an array of iovec. The iov_len is assigned to the -- same length in all of these. The actual buffers are allocated -- and stuck in an unlifted array. Pointers to these buffers (we can -- do that because they are pinned) go in the iov_base field. initializeIOVectors :: MutableUnliftedArray RealWorld (MutableByteArray RealWorld) -- buffers -> Addr -- array of iovec -> CSize -- chunk size -> CSize -- chunk count -> IO () initializeIOVectors bufs iovecsAddr chunkSize chunkCount = let go !ix !iovecAddr = if ix < csizeToInt chunkCount then do initializeIOVector bufs iovecAddr chunkSize ix go (ix + 1) (plusAddr iovecAddr (cintToInt PST.sizeofIOVector)) else pure () in go 0 iovecsAddr -- Initialize a single iovec. We write the pinned byte array into -- both the iov_base field and into an unlifted array. There is a -- copy of this function in Linux.Socket. initializeIOVector :: MutableUnliftedArray RealWorld (MutableByteArray RealWorld) -> Addr -> CSize -> Int -> IO () initializeIOVector bufs iovecAddr chunkSize ix = do buf <- PM.newPinnedByteArray (csizeToInt chunkSize) PM.writeUnliftedArray bufs ix buf let !(Exts.Ptr bufAddr#) = PM.mutableByteArrayContents buf bufAddr = Addr bufAddr# PST.pokeIOVectorBase iovecAddr bufAddr PST.pokeIOVectorLength iovecAddr chunkSize -- This is intended to be called on an array of iovec after recvmsg -- and before deepFreezeIOVectors. An adaptation of this function exists -- in Linux.Socket. countAndShrinkIOVectors :: Int -- Total number of supplied iovecs -> Int -- Total amount of space used by receive -> Int -- Amount of space per buffer (each buffer must have equal size) -> MutableUnliftedArray RealWorld (MutableByteArray RealWorld) -> IO Int countAndShrinkIOVectors !n !totalUsedSz !maxBufSz !bufs = go 0 totalUsedSz where -- This outer if (checking that the index is in bounds) should -- not actually be necessary. I will remove once the test suite -- bolsters my confidence. go !ix !remainingBytes = if ix < n then if remainingBytes >= maxBufSz then go (ix + 1) (remainingBytes - maxBufSz) else if remainingBytes == 0 then pure ix else do buf <- PM.readUnliftedArray bufs ix shrinkMutableByteArray buf remainingBytes pure (ix + 1) else pure ix -- Freeze a slice of the mutable byte arrays inside the unlifted -- array. This copies makes a copy of the slice of the original -- array. A copy of this function exists in Linux.Socket. deepFreezeIOVectors :: Int -- How many iovecs actually had a non-zero number of bytes -> MutableUnliftedArray RealWorld (MutableByteArray RealWorld) -> IO (UnliftedArray ByteArray) deepFreezeIOVectors n m = do x <- PM.unsafeNewUnliftedArray n let go !ix = if ix < n then do PM.writeUnliftedArray x ix =<< PM.unsafeFreezeByteArray =<< PM.readUnliftedArray m ix go (ix + 1) else PM.unsafeFreezeUnliftedArray x go 0 unByteArray :: ByteArray -> ByteArray# unByteArray (ByteArray x) = x touchMutableUnliftedArray :: MutableUnliftedArray RealWorld a -> IO () touchMutableUnliftedArray (MutableUnliftedArray x) = touchMutableUnliftedArray# x touchUnliftedArray :: UnliftedArray a -> IO () touchUnliftedArray (UnliftedArray x) = touchUnliftedArray# x touchMutableByteArray :: MutableByteArray RealWorld -> IO () touchMutableByteArray (MutableByteArray x) = touchMutableByteArray# x touchMutableUnliftedArray# :: MutableArrayArray# RealWorld -> IO () touchMutableUnliftedArray# x = IO $ \s -> case touch# x s of s' -> (# s', () #) touchUnliftedArray# :: ArrayArray# -> IO () touchUnliftedArray# x = IO $ \s -> case touch# x s of s' -> (# s', () #) touchMutableByteArray# :: MutableByteArray# RealWorld -> IO () touchMutableByteArray# x = IO $ \s -> case touch# x s of s' -> (# s', () #) touchLifted :: a -> IO () touchLifted x = IO $ \s -> case touch# x s of s' -> (# s', () #) {- $conversion These functions are used to convert IPv4 addresses and ports between network byte order and host byte order. They are essential when working with 'SocketAddressInternet'. To avoid getting in the way of GHC compile-time optimizations, these functions are not actually implemented with FFI calls to @htonl@ and friends. Rather, they are reimplemented in haskell. -} {- $receiveMessage The function @recvMsg@ presents us with a challenge. Since it uses a data structure with many nested pointers, we have to use pinned byte arrays for everything. There is also the difficulty of marshalling haskell's unlifted array (array of arrays) type into what C's array of @iovec@. There's the question of the array of @cmsghdr@s. On top of all of this, we have to answer the question of whether we want to accept mutable buffer or whether we want to do the allocations internally (both for the buffers and for the ancilliary data structurs needed to massage the data into what C expects). What we do to handle this in offer several variants of @recvmsg@ ending in @A@, @B@, etc. -} isByteArrayPinned :: ByteArray -> Bool {-# inline isByteArrayPinned #-} isByteArrayPinned (ByteArray arr#) = Exts.isTrue# (Exts.isByteArrayPinned# arr#) isMutableByteArrayPinned :: MutableByteArray s -> Bool {-# inline isMutableByteArrayPinned #-} isMutableByteArrayPinned (MutableByteArray marr#) = Exts.isTrue# (Exts.isMutableByteArrayPinned# marr#) unMba :: MutableByteArray s -> MutableByteArray# s {-# inline unMba #-} unMba (MutableByteArray x) = x