On 11/03/2012 01:31, Volker Wysk wrote:
Hi
This is an addition to my previous post.
This modified version of main seems to work:
main = do
fd- unsafeWithHandleFd stdin return
putStrLn (stdin: fd = ++ show fd)
fd- unsafeWithHandleFd stdout return
putStrLn (stdout: fd = ++
Am Montag 12 März 2012, 12:31:27 schrieb Simon Marlow:
On 11/03/2012 01:31, Volker Wysk wrote:
However, I want to use it with stdin, stdout and stderr, only.
Is there some reason you can't just use 0, 1, and 2?
This is complicated. I want to be able to fork a child action, and communicate
Hello!
A few months ago, I started a discussion about how to extract the file
descriptor of a handle, without the side effect of closing the handle. Bas van
Dijk kindly provided the following function:
unsafeWithHandleFd :: Handle - (Fd - IO a) - IO a
(The action in the second argument is
Hi
This is an addition to my previous post.
This modified version of main seems to work:
main = do
fd - unsafeWithHandleFd stdin return
putStrLn (stdin: fd = ++ show fd)
fd - unsafeWithHandleFd stdout return
putStrLn (stdout: fd = ++ show fd)
The way I understand it,
Can you use 'dup' to copy the file descriptor and return that version?
That will keep a reference to the file even if haskell closes the
original descriptor.
John
On Sat, Mar 10, 2012 at 5:31 PM, Volker Wysk p...@volker-wysk.de wrote:
Hi
This is an addition to my previous post.
This
Hello!
I need to get the file descriptors of some handles, but the handles should not
be modified. They should not be closed by the operation.
I guess, that the handle gets closed for a reason. But I'm using the revealed
file descriptors in a way which should pose no problems for the integrity
On Saturday 01 October 2011 08:30:40 Volker Wysk wrote:
If anyone can point out to me, how this non-blocking handleToFd function
should be made, I would be grateful.
This should be non-CLOSING handleToFd function. Sorry.
Volker
___
On 1 October 2011 08:30, Volker Wysk p...@volker-wysk.de wrote:
1.
data FD = FD {
fdFD :: {-# UNPACK #-} !CInt,
fdIsNonBlocking :: {-# UNPACK #-} !Int
}
What is that exclamation mark?
That's a strictness annotation and is haskell98/2010:
