[Libvir] [patch 1/3] Add UUID generation to qemud
Richard W.M. Jones
rjones at redhat.com
Mon Feb 26 14:49:18 UTC 2007
Mark McLoughlin wrote:
> +static int
> +qemudGenerateRandomBytes(unsigned char *buf,
> + int buflen)
> +{
> + int fd;
> +
> + if ((fd = open("/dev/urandom", O_RDONLY)) < 0)
> + return errno;
> +
> + while (buflen > 0) {
> + int n;
> +
> + if ((n = read(fd, buf, buflen)) <= 0) {
> + if (errno == EINTR)
> + continue;
> + close(fd);
> + return n < 0 ? errno : ENODATA;
> + }
> +
> + buf += n;
> + buflen -= n;
> + }
> +
> + close(fd);
> +
> + return 0;
> +}
This function would actually be quite useful as a generally available
function. In the remote patch I have added the following to configure.in:
dnl /dev/urandom
AC_CHECK_FILES([/dev/urandom])
and then in C code I can write:
#if HAVE__DEV_URANDOM /* NB double underscore */
// random blah blah
#else
// pseudorandom blah blah
#endif
Rich.
--
Emerging Technologies, Red Hat http://et.redhat.com/~rjones/
64 Baker Street, London, W1U 7DF Mobile: +44 7866 314 421
"[Negative numbers] darken the very whole doctrines of the equations
and make dark of the things which are in their nature excessively
obvious and simple" (Francis Maseres FRS, mathematician, 1759)
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