Re: [libvirt] [PATCH] cgroup: preserve correct errno on failure
On Tue, Feb 15, 2011 at 05:33:09PM -0700, Eric Blake wrote:
On 02/15/2011 05:01 PM, Eric Blake wrote:
> * src/util/cgroup.c (virCgroupSetValueStr, virCgroupGetValueStr)
> (virCgroupRemoveRecursively): VIR_DEBUG can clobber errno.
> (virCgroupRemove): Use VIR_DEBUG rather than DEBUG.
> ---
> rc = virFileWriteStr(keypath, value, 0);
> if (rc < 0) {
> - DEBUG("Failed to write value '%s': %m", value);
> rc = -errno;
> + VIR_DEBUG("Failed to write value '%s': %m", value);
Should we go one step further and guarantee that VIR_DEBUG() does not
modify errno?
We should probably do this, basically in virLogMessage() save and restore
errno so that even INFO or WARN don't change it if activated, but I would
do this as a post 0.8.8 :-)
Daniel
--
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