File media type

Marcus Meissner marcus at
Fri Oct 19 01:58:09 CDT 2001

On Thu, Oct 18, 2001 at 05:57:22PM -0700, Alexandre Julliard wrote:
> Ove Kaaven <ovehk at> 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.

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

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