Re: [Qemu-devel] [PATCH 1/7] util: Add UUID API

[Fam Zheng <famz@redhat.com>]

On Tue, 08/02 15:45, Paolo Bonzini wrote:
> 
> 
> ----- Original Message -----
> > From: "Fam Zheng" <famz@redhat.com>
> > To: qemu-devel@nongnu.org
> > Cc: famz@redhat.com, berrange@redhat.com, pbonzini@redhat.com, kwolf@redhat.com, mreitz@redhat.com,
> > mdroth@linux.vnet.ibm.com, armbru@redhat.com, sw@weilnetz.de, qemu-block@nongnu.org
> > Sent: Tuesday, August 2, 2016 11:18:32 AM
> > Subject: [PATCH 1/7] util: Add UUID API
> > 
> > A number of different places across the code base use CONFIG_UUID. Some
> > of them are soft dependency, some are not built if libuuid is not
> > available, some come with dummy fallback, some throws runtime error.
> > 
> > It is hard to maintain, and hard to reason for users.
> > 
> > Since UUID is a simple standard with only a small number of operations,
> > it is cleaner to have a central support in libqemuutil. This patch adds
> > qemu_uuid_* the functions so that all uuid users in the code base can
> > rely on. Except for qemu_uuid_generate which is new code, all other
> > functions are just copy from existing fallbacks from other files.
> 
> How is g_random_* seeded?

According to glib doc:

> GLib changed the seeding algorithm for the pseudo-random number generator
> Mersenne Twister, as used by GRand.

The urandom source is /dev/urandom (or time based if unavailable).

(RFC 4122 explicitly accepts pseudo-random.)

Fam