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Re: [libvirt] [Qemu-devel] [PATCH v4 7/7] osdep: Enable qemu_open to dup pre-opened fd





On 06/25/2012 11:26 AM, Kevin Wolf wrote:
Am 25.06.2012 16:34, schrieb Eric Blake:
Also, I noticed in the fnctl man page that F_SETFL:  "On Linux this
command can change only the O_APPEND, O_ASYNC, O_DIRECT, O_NOATIME, and
O_NONBLOCK flags."  So I'll only set/unset these flags.

O_NDELAY is the obsolete spelling of O_NONBLOCK; which means the only
other flags in your list not supported by Linux are O_LARGEFILE (which I
said was pointless), O_NOCTTY (which only has an impact at open() and
not later on, so it is not worth worrying about), and O_SYNC (so for
that one, you should error out if not set correctly, as the difference
between O_SYNC on vs. off is significant).

As far as I know, newer kernels can change O_SYNC with fcntl, so it's
probably worth trying, but you'd have to check if it has really been set.

Kevin


Ok I'll test it out and change O_SYNC if possible.  Thanks.

--
Regards,
Corey



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