Re: File media type

[Alexandre Julliard]

Ove Kaaven  writes:
> But since to do this, MapViewOfFile needs to know the media type, and the
> file name is only known in CreateFile, I apparently need to store the
> media type in the wineserver object to accomplish this.
>
> Would changing the wineserver protocol in this way be a good idea?

It's certainly a possibility. It would be nice to be able to tell
directly from the file descriptor, so that we wouldn't depend on the
user getting the drive specifications right. But I can't think of a
Unix function that would allow doing this cleanly.

File media type

[Marcus Meissner]

On Thu, Oct 18, 2001 at 05:57:22PM -0700, Alexandre Julliard wrote:
> Ove Kaaven  writes:
> > But since to do this, MapViewOfFile needs to know the media type, and the
> > file name is only known in CreateFile, I apparently need to store the
> > media type in the wineserver object to accomplish this.
> >
> > Would changing the wineserver protocol in this way be a good idea?
>
> It's certainly a possibility. It would be nice to be able to tell
> directly from the file descriptor, so that we wouldn't depend on the
> user getting the drive specifications right. But I can't think of a
> Unix function that would allow doing this cleanly.

Well, nearly clean would be this code:

The defines are Linux specific, but could be handled by ifdef/autoconf checks.
Solaris has fstatvfs() and probably similar magic constants.

BOOL
is_on_cdrom(int fd) {
    struct statfs buf;

if (-1==fstatfs(fd,&buf))
    return FALSE;
    return ((buf.f_type == ISOFS_SUPER_MAGIC)||(buf.f_type == UDF_SUPER_MAGIC));
}

Ciao, Marcus

File media type

[Ove Kaaven]

On Fri, 19 Oct 2001, Marcus Meissner wrote:
> Well, nearly clean would be this code:
>
> The defines are Linux specific, but could be handled by ifdef/autoconf checks.
> Solaris has fstatvfs() and probably similar magic constants.
>
> BOOL
> is_on_cdrom(int fd) {
>     struct statfs buf;
> if (-1==fstatfs(fd,&buf))
>
> return FALSE;
>     return ((buf.f_type == ISOFS_SUPER_MAGIC)||(buf.f_type == UDF_SUPER_MAGIC));
> }

That's not a foolproof check for removable media... though it would
trigger for loopback mounts, which may or may not be good, it doesn't
check for floppy disks, which I consider just as important to support disk
changes for, if not more.