Re: 64-bit file operations (lseek64() etc) misbehaving

[Igor Pechtchanski <pechtcha at cs dot nyu dot edu>]

On Wed, 31 Mar 2004, Mike Brown wrote:

> Hi,
>
> cygwin 1.5.9-1 on Windows XP Service Pack 1.
>
> I need 64-bit versions of lseek() and friends.  No prototype exists for
> lseek64().  I've searched the archives on the list and many claim that
> 64-bit support is "automatic" and lseek() resolves at compile time to
> lseek64().  This isn't happening for me.  Is there a compile time
> define I need to make this happen?
>
> [snip]
> Here's a simple example app I'm using.  I run via:  a.out PhysicalDrive0

Michael,

I don't know if it's related to the problem you're having, but I'm sure
you've read <http://cygwin.com/cygwin-ug-net/using-specialnames.html>,
right?  Try compiling a Linux version with "#define lseek64 lseek", and
use ./a.exe /dev/sda (note that Cygwin gcc produces a.exe, not a.out, by
default, so I assume the above is a typo or the result of an explicit "-o"
flag).
	Igor

> -----------------------
> /* #define LINUX */
> #define WIN32
>
> [snip]
> #ifdef WIN32
>         /* automatically add the \\.\ crap in front */
>         sprintf(filename, "\\\\.\\%s", argv[1]);
> #else
>         sprintf(filename, "%s", argv[1]);
> #endif
> [snip]
> #ifdef WIN32
>         maxblock = lseek(fd, 0, SEEK_END);
> #else
>         maxblock = lseek64(fd, 0, SEEK_END);
> #endif

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