Re: [linux-usb-devel] USB/hal: USB open() broken? (USB CD burnerunderruns, USB HDD hard resets)

[Alan Cox]

Ar Maw, 2006-06-20 am 11:05 +0200, ysgrifennodd Andreas Mohr:
> But how would HAL safely determine whether a (IDE/USB) drive is busy?
> As my test app demonstrates (without HAL running), the *very first* open()
> happening during an ongoing burning operation will kill it instantly, in the
> USB case.
> Are there any options left for HAL at all? Still seems to strongly point
> towards a kernel issue so far.

In the IDE space O_EXCL has the needed semantics. At least it does on
Fedora and I don't think thats a Fedora patch, not sure if this is the
case for the USB side of things. 

> One (rather less desireable) way I can make up might be to have HAL
> keep the device open permanently and do an ioctl query on whether it's "busy"
> and then quickly close the device again before the newly started
> burning process gets disrupted (if this even properly works at all).

O_EXCL used by cdrecord is probably the right thing

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