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monnier |
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(* posix-io.sml
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*
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* COPYRIGHT (c) 1995 AT&T Bell Laboratories.
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*
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* Structure for POSIX 1003.1 primitive I/O operations
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*
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*)
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local
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structure SysWord = SysWordImp
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structure Int = IntImp
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in
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structure POSIX_IO =
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struct
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structure FS = POSIX_FileSys
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structure OM : sig
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datatype open_mode = O_RDONLY | O_WRONLY | O_RDWR
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end = FS
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open OM
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type word = SysWord.word
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type s_int = SysInt.int
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val ++ = SysWord.orb
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val & = SysWord.andb
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infix ++ &
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fun cfun x = CInterface.c_function "POSIX-IO" x
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val osval : string -> s_int = cfun "osval"
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val w_osval = SysWord.fromInt o osval
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fun fail (fct,msg) = raise Fail ("POSIX_IO."^fct^": "^msg)
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type file_desc = FS.file_desc
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type pid = POSIX_Process.pid
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val pipe' : unit -> s_int * s_int = cfun "pipe"
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fun pipe () = let
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val (ifd, ofd) = pipe' ()
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in
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{infd = FS.fd ifd, outfd = FS.fd ofd}
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end
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val dup' : s_int -> s_int = cfun "dup"
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val dup2' : s_int * s_int -> unit = cfun "dup2"
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fun dup fd = FS.fd(dup' (FS.intOf fd))
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fun dup2 {old, new} = dup2'(FS.intOf old, FS.intOf new)
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val close' : s_int -> unit = cfun "close"
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fun close fd = close' (FS.intOf fd)
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val read' : int * int -> Word8Vector.vector = cfun "read"
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val readbuf' : int * Word8Array.array * int * int -> int = cfun "readbuf"
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fun readArr (fd, {buf, i, sz=NONE}) = let
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val alen = Word8Array.length buf
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in
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if 0 <= i andalso i <= alen
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then readbuf'(FS.intOf fd, buf, alen - i, i)
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else raise Subscript
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end
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| readArr (fd, {buf, i, sz=SOME sz}) = let
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val alen = Word8Array.length buf
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in
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if 0 <= i andalso 0 <= sz andalso i + sz <= alen
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then readbuf'(FS.intOf fd, buf, sz, i)
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else raise Subscript
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end
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fun readVec (fd,cnt) =
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if cnt < 0 then raise Subscript else read'(FS.intOf fd, cnt)
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val writevec' : (int * Word8Vector.vector * int * int) -> int = cfun "writebuf"
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val writearr' : (int * Word8Array.array * int * int) -> int = cfun "writebuf"
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fun writeArr (fd,{buf, i, sz=NONE}) = let
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val alen = Word8Array.length buf
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in
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if 0 <= i andalso i <= alen
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then writearr'(FS.intOf fd, buf, alen-i, i)
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else raise Subscript
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end
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| writeArr (fd,{buf, i, sz=SOME sz}) = let
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val alen = Word8Array.length buf
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in
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if 0 <= i andalso 0 <= sz andalso i + sz <= alen
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then writearr'(FS.intOf fd, buf, sz, i)
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else raise Subscript
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end
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fun writeVec (fd,{buf, i, sz=NONE}) = let
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val vlen = Word8Vector.length buf
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in
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if 0 <= i andalso i <= vlen
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then writevec'(FS.intOf fd, buf, vlen-i, i)
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else raise Subscript
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end
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| writeVec (fd,{buf, i, sz=SOME sz}) = let
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val vlen = Word8Vector.length buf
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in
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if 0 <= i andalso 0 <= sz andalso i + sz <= vlen
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then writevec'(FS.intOf fd, buf, sz, i)
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else raise Subscript
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end
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datatype whence = SEEK_SET | SEEK_CUR | SEEK_END
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val seek_set = osval "SEEK_SET"
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val seek_cur = osval "SEEK_CUR"
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val seek_end = osval "SEEK_END"
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fun whToWord SEEK_SET = seek_set
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| whToWord SEEK_CUR = seek_cur
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| whToWord SEEK_END = seek_end
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fun whFromWord wh =
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if wh = seek_set then SEEK_SET
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else if wh = seek_cur then SEEK_CUR
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else if wh = seek_end then SEEK_END
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else fail ("whFromWord","unknown whence "^(Int.toString wh))
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structure FD =
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struct
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datatype flags = FDF of word
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fun fromWord w = FDF w
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fun toWord (FDF w) = w
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blume |
867 |
val all = FDF (SysWord.notb 0w0)
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monnier |
416 |
fun flags ms = FDF(List.foldl (fn (FDF m,acc) => m ++ acc) 0w0 ms)
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blume |
867 |
fun intersect ms = FDF(List.foldl (fn (FDF m,acc) => m & acc)
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(SysWord.notb 0w0) ms)
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fun clear (FDF m, FDF m') = FDF (SysWord.notb m & m')
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monnier |
416 |
fun anySet (FDF m, FDF m') = (m & m') <> 0w0
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fun allSet (FDF m, FDF m') = (m & m') = m
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val cloexec = FDF(w_osval "cloexec")
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end
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structure O =
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struct
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datatype flags = FS of word
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fun fromWord w = FS w
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fun toWord (FS w) = w
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blume |
867 |
val all = FS (SysWord.notb 0w0) (* too much?? *)
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monnier |
416 |
fun flags ms = FS(List.foldl (fn (FS m,acc) => m ++ acc) 0w0 ms)
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blume |
867 |
fun intersect ms = FS(List.foldl (fn (FS m,acc) => m & acc)
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(SysWord.notb 0w0) ms)
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fun clear (FS m, FS m') = FS (SysWord.notb m & m')
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monnier |
416 |
fun anySet (FS m, FS m') = (m & m') <> 0w0
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fun allSet (FS m, FS m') = (m & m') = m
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val append = FS(w_osval "append")
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val dsync = FS(w_osval "dsync")
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val nonblock = FS(w_osval "nonblock")
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val rsync = FS(w_osval "rsync")
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val sync = FS(w_osval "sync")
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end
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val fcntl_d : s_int * s_int -> s_int = cfun "fcntl_d"
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val fcntl_gfd : s_int -> word = cfun "fcntl_gfd"
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val fcntl_sfd : (s_int * word) -> unit = cfun "fcntl_sfd"
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val fcntl_gfl : s_int -> (word * word) = cfun "fcntl_gfl"
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val fcntl_sfl : (s_int * word) -> unit = cfun "fcntl_sfl"
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fun dupfd {old, base} = FS.fd (fcntl_d (FS.intOf old, FS.intOf base))
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fun getfd fd = FD.FDF (fcntl_gfd (FS.intOf fd))
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fun setfd (fd, FD.FDF fl) = fcntl_sfd(FS.intOf fd, fl)
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fun getfl fd = let
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val (sts, omode) = fcntl_gfl (FS.intOf fd)
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in
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(O.FS sts, FS.omodeFromWord omode)
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end
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fun setfl (fd, O.FS sts) = fcntl_sfl (FS.intOf fd, sts)
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datatype lock_type = F_RDLCK | F_WRLCK | F_UNLCK
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structure FLock =
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struct
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datatype flock = FLOCK of {
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l_type : lock_type,
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l_whence : whence,
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l_start : Position.int,
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l_len : Position.int,
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l_pid : pid option
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}
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blume |
867 |
fun flock { ltype, whence, start, len, pid } =
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FLOCK { l_type = ltype, l_whence = whence, l_start = start,
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l_len = len, l_pid = pid }
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monnier |
416 |
fun ltype (FLOCK{l_type,...}) = l_type
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fun whence (FLOCK{l_whence,...}) = l_whence
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fun start (FLOCK{l_start,...}) = l_start
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fun len (FLOCK{l_len,...}) = l_len
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fun pid (FLOCK{l_pid,...}) = l_pid
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end
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type flock_rep = s_int * s_int * Position.int * Position.int * s_int
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val fcntl_l : s_int * s_int * flock_rep -> flock_rep = cfun "fcntl_l"
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val f_getlk = osval "F_GETLK"
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val f_setlk = osval "F_SETLK"
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val f_setlkw = osval "F_SETLKW"
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val f_rdlck = osval "F_RDLCK"
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val f_wrlck = osval "F_WRLCK"
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val f_unlck = osval "F_UNLCK"
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fun flockToRep (FLock.FLOCK{l_type,l_whence,l_start,l_len,...}) = let
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fun ltypeOf F_RDLCK = f_rdlck
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| ltypeOf F_WRLCK = f_wrlck
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| ltypeOf F_UNLCK = f_unlck
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in
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(ltypeOf l_type,whToWord l_whence, l_start, l_len, 0)
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end
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fun flockFromRep (usepid,(ltype,whence,start,len,pid)) = let
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fun ltypeOf ltype =
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if ltype = f_rdlck then F_RDLCK
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else if ltype = f_wrlck then F_WRLCK
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else if ltype = f_unlck then F_UNLCK
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else fail ("flockFromRep","unknown lock type "^(Int.toString ltype))
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in
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FLock.FLOCK {
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l_type = ltypeOf ltype,
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l_whence = whFromWord whence,
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l_start = start,
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l_len = len,
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l_pid = if usepid then SOME(POSIX_Process.PID pid) else NONE
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}
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end
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fun getlk (fd, flock) =
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flockFromRep(true,fcntl_l(FS.intOf fd,f_getlk,flockToRep flock))
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fun setlk (fd, flock) =
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flockFromRep(false,fcntl_l(FS.intOf fd,f_setlk,flockToRep flock))
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fun setlkw (fd, flock) =
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flockFromRep(false,fcntl_l(FS.intOf fd,f_setlkw,flockToRep flock))
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val lseek' : s_int * Position.int * s_int -> Position.int = cfun "lseek"
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fun lseek (fd,offset,whence) = lseek'(FS.intOf fd,offset, whToWord whence)
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val fsync' : s_int -> unit = cfun "fsync"
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fun fsync fd = fsync' (FS.intOf fd)
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blume |
867 |
fun mkBinReader _ = raise Fail "mkBinReader not implemented"
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fun mkTextReader _ = raise Fail "mkTextReader not implemented"
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fun mkBinWriter _ = raise Fail "mkBinWriter not implemented"
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fun mkTextWriter _ = raise Fail "mkTextWriter not implemented"
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monnier |
416 |
end (* structure POSIX_IO *)
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end
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