Messages in this thread | | | Date | Thu, 09 Feb 2006 18:15:22 +0100 | From | Matthias Andree <> | Subject | Re: CD writing in future Linux (stirring up a hornets' nest) |
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Jan Engelhardt wrote: >> Please explain me: >> >> - how to use /dev/hd* in order to scan an image from a scanner >> - how to use /dev/hd* in order to talk to a CPU device >> - how to use /dev/hd* in order to talk to a tape device >> - how to use /dev/hd* in order to talk to a printer >> - how to use /dev/hd* in order to talk to a jukebox >> - how to use /dev/hd* in order to talk to a graphical device
> With /dev/sg, this was possible?
Theoretically, yes, provided there was an application talking raw SCSI to the device in question. /dev/sg is a generic SCSI device that allows the sending of commands. It does not implement higher-level device models such as direct access (/dev/sd*), CD-ROM (/dev/sr*), sequential access (/dev/[n]st*) or similar. It's kind of "raw SCSI".
OTOH, there is, according to kernel developers, no difference between /dev/sg and /dev/hd for SCSI command access via the SG_IO ioctl, so unless someone documents /dev/hd* bugs that /dev/sg* doesn't share, it appears as though the user space would have to live with a /dev/hd* that unifies the mid-level "raw SCSI command" and the high-level (block device) access. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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