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DateSun, 28 Nov 2004 14:20:19 +0100
FromTomas Carnecky <>
SubjectRe: Problem with ioctl command TCGETS
Miklos Szeredi wrote:
>>>>Think read(2)/write(2).  We already have several barfbags too many,
>>>>and that includes both ioctl() and setsockopt().  We are stuck with
>>>>them for compatibility reasons, but why the hell would we need yet
>>>>another one?>>>>>>You can't replace either ioctl() or setsockopt() with read/write can
>>>you?  Both of them set out-of-band information on file descriptors.>>>>Out-of-band == should be on a separate channel...> > > Tell me how?  E.g. how would you set/get sound stream parameters if
> not with ioctl()?> 

Maybe using sysfs? /sys/device/cdrom/param ?
But then you'd have to open another file :(

And what about somethink like:
cdrom_fd = open("/dev/cdrom", O_RDWR)
cdrom_param_fd = get_param_fd(cdrom_fd) /* a new syscall */
Now read/write to this param fd.
And two new entries in the struct file_operations:
write_param([same args as write])
read_param([same args as read])
tom
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