write eof without closing

[Grant Edwards]

On 2006-08-19, Tim Chase <python.list at tim.thechases.com> wrote:
>>> can i write a eof to a file descriptor without closing it?
>> 
>> No.  Not on Windows, OS-X, or Unix.  There is no such thing as
>> "an eof".
>> 
>> On CP/M Ctrl-Z is used as EOF for text files.
>
> Common Dos/Window convention also uses ctrl+Z (0x1a) for EOF.
>
> 	c:\> copy con test.txt
> 	hello
> 	^Z
> 	c:\>

IIRC, ctrl-Z is not used _in_files_ to represent EOF.  Only
when text is being entered at the console.

> *nix usually uses ctrl+D (0x04) as an EOF signal...and OS-X
> being Unixish also uses the same.
>
> 	bash$ cat > test.txt
> 	hello
> 	^D
> 	bash$

That's just the tty line-discipline layer of the tty driver.
When it sees Ctrl-D as the first thing on a "line", it closes
the file descriptor causing the client to see an EOF.  That
feature in the line-discipline layer can be disabled or
configured to use any other character.

I suspect what the OP really needs to do is write a newline and
then flush the stream.

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