1 files changed, 119 insertions, 0 deletions
diff --git a/nuttx/sched/clock_getres.c b/nuttx/sched/clock_getres.c
new file mode 100644
index 0000000000..5cf07f2499
--- /dev/null
+++ b/nuttx/sched/clock_getres.c
@@ -0,0 +1,119 @@
+/************************************************************
+ * clock_getres.c
+ *
+ *   Copyright (C) 2007 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <spudmonkey@racsa.co.cr>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name Gregory Nutt nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ************************************************************/
+
+/************************************************************
+ * Included Files
+ ************************************************************/
+
+#include <sys/types.h>
+#include <time.h>
+#include <errno.h>
+#include <debug.h>
+#include "clock_internal.h"
+
+/************************************************************
+ * Definitions
+ ************************************************************/
+
+/************************************************************
+ * Private Type Declarations
+ ************************************************************/
+
+/************************************************************
+ * Private Function Prototypes
+ ************************************************************/
+
+/**********************************************************
+ * Public Constant Data
+ **********************************************************/
+
+/************************************************************
+ * Public Variables
+ ************************************************************/
+
+/**********************************************************
+ * Private Variables
+ **********************************************************/
+
+/************************************************************
+ * Private Functions
+ ************************************************************/
+
+/************************************************************
+ * Public Functions
+ ************************************************************/
+
+/************************************************************
+ * Function:  clock_getres
+ *
+ * Description:
+ *   Clock Functions based on POSIX APIs
+ *
+ ************************************************************/
+
+int clock_getres(clockid_t clock_id, struct timespec *res)
+{
+  uint32 time_res;
+  int    ret = OK;
+
+  dbg("%s: clock_id=%d\n", __FUNCTION__, clock_id);
+
+  /* Only CLOCK_REALTIME is supported */
+
+  if (clock_id != CLOCK_REALTIME)
+    {
+      dbg("%s: Returning ERROR\n", __FUNCTION__);
+      *get_errno_ptr() = EINVAL;
+      ret = ERROR;
+    }
+  else
+    {
+      /* Get the clock resolution in nanoseconds */
+
+      time_res = MSEC_PER_TICK * NSEC_PER_MSEC;
+
+      /* And return this as a timespec. */
+
+      res->tv_sec  = 0;
+      res->tv_nsec = time_res;
+
+      dbg("%s: Returning res=(%d,%d) time_res=%d\n",
+          __FUNCTION__,
+          (int)res->tv_sec, (int)res->tv_nsec,
+          (int)time_res);
+    }
+
+  return ret;
+}