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Added newAsyncFile proc (#6129)

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This commit is contained in:
Yuriy Glukhov
2017-07-21 18:20:21 +03:00
committed by Andreas Rumpf
parent b922347990
commit bbbf5cf800
1 changed files with 13 additions and 8 deletions
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21
lib/pure/asyncfile.nim
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@@ -81,27 +81,32 @@ proc getFileSize*(f: AsyncFile): int64 =
else:
result = lseek(f.fd.cint, 0, SEEK_END)
proc newAsyncFile*(fd: AsyncFd): AsyncFile =
## Creates `AsyncFile` with a previously opened file descriptor `fd`.
new result
result.fd = fd
register(result.fd)
proc openAsync*(filename: string, mode = fmRead): AsyncFile =
## Opens a file specified by the path in ``filename`` using
## the specified ``mode`` asynchronously.
new result
when defined(windows) or defined(nimdoc):
let flags = FILE_FLAG_OVERLAPPED or FILE_ATTRIBUTE_NORMAL
let desiredAccess = getDesiredAccess(mode)
let creationDisposition = getCreationDisposition(mode, filename)
when useWinUnicode:
result.fd = createFileW(newWideCString(filename), desiredAccess,
let fd = createFileW(newWideCString(filename), desiredAccess,
FILE_SHARE_READ,
nil, creationDisposition, flags, 0).AsyncFd
else:
result.fd = createFileA(filename, desiredAccess,
let fd = createFileA(filename, desiredAccess,
FILE_SHARE_READ,
nil, creationDisposition, flags, 0).AsyncFd
if result.fd.Handle == INVALID_HANDLE_VALUE:
if fd.Handle == INVALID_HANDLE_VALUE:
raiseOSError(osLastError())
register(result.fd)
result = newAsyncFile(fd)
if mode == fmAppend:
result.offset = getFileSize(result)
@@ -110,11 +115,11 @@ proc openAsync*(filename: string, mode = fmRead): AsyncFile =
let flags = getPosixFlags(mode)
# RW (Owner), RW (Group), R (Other)
let perm = S_IRUSR or S_IWUSR or S_IRGRP or S_IWGRP or S_IROTH
result.fd = open(filename, flags, perm).AsyncFD
if result.fd.cint == -1:
let fd = open(filename, flags, perm).AsyncFD
if fd.cint == -1:
raiseOSError(osLastError())
register(result.fd)
result = newAsyncFile(fd)
proc readBuffer*(f: AsyncFile, buf: pointer, size: int): Future[int] =
## Read ``size`` bytes from the specified file asynchronously starting at