Re: [Caml-list] Re: portable truncate

[Florent Monnier <monnier.florent@gmail.com>]

2013/7/27, Adrien Nader wrote:
> On Sat, Jul 27, 2013, Florent Monnier wrote:
[...]
>> mingw's additional lib has to be used if we're using thread for
>> example if I have understood correctly.
>
> What makes you think so?

The sentence below that is on the website of the project:

"It does depend on a number of DLLs provided by Microsoft themselves,
as components of the operating system; most notable among these is
MSVCRT.DLL, the Microsoft C runtime library. Additionally, threaded
applications must ship with a freely distributable thread support DLL,
provided as part of MinGW itself"

> A quick look seems to indicate the opposite. There is no specific thread
> support provided by mingw*.
> There are pthreads-win32 and winpthreads but I don't see the build
> system use them on Windows; I see calls to CreateThead() (typical win32
> stuff) however for instance.
>
>> >> - truncate()  DOES work on my computer
>> >> - ftruncate() / _chsize()  DOESN'T
>> >
>> > That's surprising and you should really try to see which error you get
>> > throw errno. You can also try a tool like FileMonitor (or whatever it's
>> > called nowadays) to see how it fails.
>>
>> I get EBADF
>>
>> http://msdn.microsoft.com/en-us/library/dk925tyb%28v=VS.80%29.aspx
>>
>> EBADF is if the specified file is read-only or the descriptor is invalid
>>
>> the file has write access for everyone.
>> And the file descriptor is converted the same way than everywhere else.
>>
>> Then I noticed that I copied the stub from otherlibs/unix/ not from
>> otherlibs/win32unix/
>> so the file descr is converted by Int_val() instead of Handle_val().
>>
>> But now I still get : EBADF
>
> And you've opened the file as read-write too?

let open_flags = [Unix.O_RDWR]
O_RDWR  (* Open for reading and writing *)


> If so, you should maybe try Process Monitor to make sure everything was
> done as expected:
>   http://technet.microsoft.com/en-us/sysinternals/bb896645.aspx

Thanks Adrien, I'll have a look at this tomorrow.

-- 
Regards