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