Resync new repository with old repo r5166

git-svn-id: http://svn.code.sf.net/p/nuttx/code/trunk@5153 42af7a65-404d-4744-a932-0658087f49c3
2026-10-23 00:33:33 +08:00 · 2012-09-17 18:18:44 +00:00
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+/********************************************************************************
+ * timer_gettime.c
+ *
+ *   Copyright (C) 2007 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * 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 NuttX 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 <nuttx/config.h>
+
+#include <time.h>
+#include <errno.h>
+
+#include "clock_internal.h"
+#include "timer_internal.h"
+
+#ifndef CONFIG_DISABLE_POSIX_TIMERS
+
+/********************************************************************************
+ * Definitions
+ ********************************************************************************/
+
+/********************************************************************************
+ * Private Data
+ ********************************************************************************/
+
+/********************************************************************************
+ * Public Data
+ ********************************************************************************/
+
+/********************************************************************************
+ * Private Functions
+ ********************************************************************************/
+
+/********************************************************************************
+ * Public Functions
+ ********************************************************************************/
+
+/********************************************************************************
+ * Name: timer_gettime
+ *
+ * Description:
+ *  The timer_gettime() function will store the amount of time until the
+ *  specified timer, timerid, expires and the reload value of the timer into the
+ *  space pointed to by the value argument. The it_value member of this structure
+ *  will contain the amount of time before the timer expires, or zero if the timer
+ *  is disarmed. This value is returned as the interval until timer expiration,
+ *  even if the timer was armed with absolute time. The it_interval member of
+ *  value will contain the reload value last set by timer_settime().
+ *
+ * Parameters:
+ *   timerid - The pre-thread timer, previously created by the call to
+ *   timer_create(), whose remaining time count will be returned..
+ *
+ * Return Value:
+ *   If the timer_gettime() succeeds, a value of 0 (OK) will be returned.
+ *   If an error occurs, the value -1 (ERROR) will be returned, and errno set to
+ *   indicate the error.
+ *
+ *   EINVAL - The timerid argument does not correspond to an ID returned by
+ *     timer_create() but not yet deleted by timer_delete().
+ *
+ * Assumptions/Limitations:
+ *   Due to the asynchronous operation of this function, the time reported
+ *   by this function could be significantly more than that actual time
+ *   remaining on the timer at any time.
+ *
+ ********************************************************************************/
+
+int timer_gettime(timer_t timerid, FAR struct itimerspec *value)
+{
+  FAR struct posix_timer_s *timer = (FAR struct posix_timer_s *)timerid;
+  int ticks;
+
+  if (!timer || !value)
+    {
+      set_errno(EINVAL);
+      return ERROR;
+    }
+
+  /* Get the number of ticks before the underlying watchdog expires */
+
+  ticks = wd_gettime(timer->pt_wdog);
+
+  /* Convert that to a struct timespec and return it */
+
+  (void)clock_ticks2time(ticks, &value->it_value);
+  (void)clock_ticks2time(timer->pt_last, &value->it_interval);
+  return OK;
+}
+
+#endif /* CONFIG_DISABLE_POSIX_TIMERS */