# stdlib file handling is broken, so we use this instead of FileStream.
import std/posix
import std/streams
type
PosixStream* = ref object of Stream
fd*: cint
isend*: bool
blocking*: bool
ErrorAgain* = object of IOError
ErrorBadFD* = object of IOError
ErrorFault* = object of IOError
ErrorInterrupted* = object of IOError
ErrorInvalid* = object of IOError
ErrorConnectionReset* = object of IOError
ErrorBrokenPipe* = object of IOError
proc raisePosixIOError*() =
# In the nim stdlib, these are only constants on linux amd64, so we
# can't use a switch.
if errno == EAGAIN or errno == EWOULDBLOCK:
raise newException(ErrorAgain, "eagain")
elif errno == EBADF:
raise newException(ErrorBadFD, "bad fd")
elif errno == EFAULT:
raise newException(ErrorFault, "fault")
elif errno == EINVAL:
raise newException(ErrorInvalid, "invalid")
elif errno == ECONNRESET:
raise newException(ErrorConnectionReset, "connection reset by peer")
elif errno == EPIPE:
raise newException(ErrorBrokenPipe, "broken pipe")
else:
raise newException(IOError, $strerror(errno))
method recvData*(s: PosixStream, buffer: pointer, len: int): int {.base.} =
let n = read(s.fd, buffer, len)
if n < 0:
raisePosixIOError()
if n == 0:
if unlikely(s.isend):
raise newException(EOFError, "eof")
s.isend = true
return n
proc recvData*(s: PosixStream, buffer: var openArray[uint8]): int {.inline.} =
return s.recvData(addr buffer[0], buffer.len)
proc recvData*(s: PosixStream, buffer: var openArray[char]): int {.inline.} =
return s.recvData(addr buffer[0], buffer.len)
method sendData*(s: PosixStream, buffer: pointer, len: int): int {.base.} =
let n = write(s.fd, buffer, len)
if n < 0:
raisePosixIOError()
return n
method setBlocking*(s: PosixStream, blocking: bool) {.base.} =
s.blocking = blocking
let ofl = fcntl(s.fd, F_GETFL, 0)
if blocking:
discard fcntl(s.fd, F_SETFL, ofl and not O_NONBLOCK)
else:
discard fcntl(s.fd, F_SETFL, ofl or O_NONBLOCK)
method sclose*(s: PosixStream) {.base.} =
discard close(s.fd)
proc psClose(s: Stream) =
PosixStream(s).sclose()
proc psReadData(s: Stream, buffer: pointer, len: int): int =
let s = PosixStream(s)
assert len != 0 and s.blocking
result = 0
while result < len:
let p = addr cast[ptr UncheckedArray[uint8]](buffer)[result]
let n = s.recvData(p, len - result)
if n == 0:
break
result += n
proc psWriteData(s: Stream, buffer: pointer, len: int) =
let s = PosixStream(s)
assert len != 0 and s.blocking
discard s.sendData(buffer, len)
proc psAtEnd(s: Stream): bool =
return PosixStream(s).isend
proc addStreamIface*(ps: PosixStream) =
ps.closeImpl = cast[typeof(ps.closeImpl)](psClose)
ps.readDataImpl = cast[typeof(ps.readDataImpl)](psReadData)
ps.writeDataImpl = cast[typeof(ps.writeDataImpl)](psWriteData)
ps.atEndImpl = psAtEnd
proc newPosixStream*(fd: FileHandle): PosixStream =
let ps = PosixStream(fd: fd, blocking: true)
ps.addStreamIface()
return ps
proc newPosixStream*(path: string, flags, mode: cint): PosixStream =
let fd = open(cstring(path), flags, mode)
if fd == -1:
return nil
return newPosixStream(fd)