utimens: validate futimens usage

[pspp] / ChangeLog

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 2009-10-10  Eric Blake  <ebb9@byu.net>
 
+       utimens: validate futimens usage
+       * lib/utimens.c (gl_futimens): Require valid fd up front, using
+       fewer syscalls on failure later on.  Avoid compiler warning on
+       mingw.
+       * modules/utimens (Depends-on): Add dup2.
+
+       utimens: add test
+       * modules/utimens-tests: New test.
+       * tests/test-utimens.h: New file.
+       * tests/test-futimens.h: Likewise.
+       * tests/test-utimens.c: Likewise.
+
        doc: mention timestamp portability issues
        * doc/glibc-functions/lutimes.texi (lutimes): Refer to utimensat
        instead.