On Sat, Jan 17, 2015 at 4:59 PM, Rob Landley <r...@landley.net> wrote: > On 01/17/2015 01:53 PM, Rob Landley wrote: >> On 01/17/2015 12:09 AM, enh wrote: >> So anyway I checked that in, and now I'm porting your patch on top of >> that change and I hit the _weirdest_ thing where "./touch nonexistent" >> doesn't cause an error because utimensat() on a file that didn't exist >> returned ok (file still doesn't exist afterwards), > > Because if both timestamps have nanoseconds set to UTIME_OMIT it returns > success even if the file did not exist. > > Possibly the man page should mention that.
yeah, the Linux man page probably based its text on the POSIX "may": "If both tv_nsec fields are set to UTIME_OMIT, no ownership or permissions check shall be performed for the file, but other error conditions may still be detected (including [EACCES] errors related to the path prefix)." the comment in the kernel source raises this to a "must not" for some reason: "/* Nothing to do, we must not even check the path. */". i've mailed the linux man pages folks. (even having read the source to send the patch to strace so that they [will in future] output the times correctly for UTIME_NOW and UTIME_OMIT when the seconds field isn't 0, and even though "must not even check the path" is explicitly stated, i guess that was so obviously wrong it didn't pass my plausibility filter. lucky you had a test for that case!) >> and when it does this its argument variable becomes NULL > > Was debugging debris (bug introduced by adding debugging code). > > Rob _______________________________________________ Toybox mailing list Toybox@lists.landley.net http://lists.landley.net/listinfo.cgi/toybox-landley.net
