Add generic POSIX implementation of C11 timespec_get.

ChangeLog

@@ -1,3 +1,7 @@
+2013-04-23  Roland McGrath  <roland@hack.frob.com>
+
+	* sysdeps/posix/timespec_get.c: New file.
+
 2013-04-23  Adhemerval Zanella  <azanella@linux.vnet.ibm.com>
 
 	* sysdeps/powerpc/power5/fpu/s_modf.c: New file: modf optimization for

sysdeps/posix/timespec_get.c

@@ -0,0 +1,38 @@
+/* timespec_get -- C11 interface to sample a clock.  Generic POSIX.1 version.
+   Copyright (C) 2013 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#include <time.h>
+
+
+/* Set TS to calendar time based in time base BASE.  */
+int
+timespec_get (struct timespec *ts, int base)
+{
+  switch (base)
+    {
+    case TIME_UTC:
+      if (clock_gettime (CLOCK_REALTIME, ts) < 0)
+        return 0;
+      break;
+
+    default:
+      return 0;
+    }
+
+  return base;
+}