include/sys/time.h, libs/libc/unistd, sched/timer: Implement alarm(), setitimer() and getitimer() APIs.

2025-12-13 23:17:11 +08:00 · 2019-11-13 08:00:45 -06:00
parent 14fcacaf27
commit 9b75ef06ea
13 changed files with 497 additions and 8 deletions
--- a/sched/timer/timer_getitimer.c
+++ b/sched/timer/timer_getitimer.c
@@ -0,0 +1,113 @@
+/****************************************************************************
+ * sched/timer/timer_getitimer.c
+ *
+ *   Copyright (C) 2019 Xiaomi Inc. All rights reserved.
+ *   Author: Xiang Xiao <xiaoxiang@xiaomi.com>
+ *
+ * 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 <errno.h>
+#include <time.h>
+#include <sys/time.h>
+
+#include "sched/sched.h"
+
+#ifndef CONFIG_DISABLE_POSIX_TIMERS
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: getitimer
+ *
+ * Description:
+ *   The getitimer() function will store the amount of time until the
+ *   specified timer, which, 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. The it_interval member of value
+ *   will contain the reload value last set by setitime().
+ *
+ * Input Parameters:
+ *   which - The predefined timer id
+ *   value - The current timer value
+ *
+ * Returned Value:
+ *   If the getitimer() 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 which argument does not correspond to an predefined ID.
+ *
+ * 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 getitimer(int which, FAR struct itimerval *value)
+{
+  FAR struct tcb_s *rtcb = this_task();
+  struct itimerspec spec =
+  {
+  };
+
+  int ret = OK;
+
+  if (which != ITIMER_REAL || !value)
+    {
+      set_errno(EINVAL);
+      return ERROR;
+    }
+
+  if (rtcb->group->itimer)
+    {
+      ret = timer_gettime(rtcb->group->itimer, &spec);
+    }
+
+  if (ret == OK)
+    {
+      TIMESPEC_TO_TIMEVAL(&value->it_value, &spec.it_value);
+      TIMESPEC_TO_TIMEVAL(&value->it_interval, &spec.it_interval);
+    }
+
+  return ret;
+}
+
+#endif /* CONFIG_DISABLE_POSIX_TIMERS */