Hello, Am Donnerstag 18 November 2010 01:41:39 schrieb Hidetoshi Seto: > This patch introduce a fallback mechanism for old systems that do not > support utimensat(). This fix build failure with following warnings: > +#ifdef CONFIG_UTIMENSAT > + return utimensat(dirfd, path, times, flags); > +#else > + /* Fallback: use utimes() instead of utimensat() */ Since we also had a problem with utimestat() some time ago with Samba <http://lists.samba.org/archive/samba-technical/2010-November/074613.html> I'd like to comment on that: Your have to be careful about compile-time-detection and runtime-detection: If you later run your utimestat()-enabled binary on an older kernel not supporting that syscall, you get -1 as the return-value and errno=ENOSYS. So even if you detected utimesatat() during compile-time, please always provide a fallback for run-time. This is less important for people compiling there own version of kvm, but is essential for Linux distributions, since people often run newer kvm versions on older kernels. Sincerely Philipp Hahn -- Philipp Hahn Open Source Software Engineer hahn@xxxxxxxxxxxxx Univention GmbH Linux for Your Business fon: +49 421 22 232- 0 Mary-Somerville-Str.1 28359 Bremen fax: +49 421 22 232-99 http://www.univention.de
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