+ /* Avoid a "parameter unused" warning. */
+ (void) st;
+#endif
+
+#if (defined HAVE_STRUCT_STAT_ST_BIRTHTIMESPEC_TV_NSEC \
+ || defined HAVE_STRUCT_STAT_ST_BIRTHTIM_TV_NSEC \
+ || defined HAVE_STRUCT_STAT_ST_BIRTHTIMENSEC)
+ /* FreeBSD and NetBSD sometimes signal the absence of knowledge by
+ using zero. Attempt to work around this problem. Alas, this can
+ report failure even for valid time stamps. Also, NetBSD
+ sometimes returns junk in the birth time fields; work around this
+ bug if it it is detected. There's no need to detect negative
+ tv_nsec junk as negative tv_nsec already indicates an error. */
+ if (t.tv_sec == 0 || 1000000000 <= t.tv_nsec)
+ t.tv_nsec = -1;