gettimeofday()函数支持时区；规范set_timeval/get_timeval函数返回值

components/libc/compilers/common/time.c

@@ -17,6 +17,7 @@
  *                             which found by Rob <rdent@iinet.net.au>
  * 2021-02-12     Meco Man     move all of the functions located in <clock_time.c> to this file
  * 2021-03-15     Meco Man     fixed a bug of leaking memory in asctime()
+ * 2021-05-01     Meco Man     support fixed timezone
  */
 
 #include <sys/time.h>
@@ -73,18 +74,18 @@ static void num2str(char *c, int i)
 }
 
 /**
- * Get time from RTC device (without timezone)
+ * Get time from RTC device (without timezone, UTC+0)
  * @param tv: struct timeval
- * @return -1 failure; 1 success
+ * @return the operation status, RT_EOK on successful
  */
-static int get_timeval(struct timeval *tv)
+static rt_err_t get_timeval(struct timeval *tv)
 {
 #ifdef RT_USING_RTC
     static rt_device_t device = RT_NULL;
     rt_err_t rst = -RT_ERROR;
 
     if (tv == RT_NULL)
-        return -1;
+        return -RT_EINVAL;
 
     /* default is 0 */
     tv->tv_sec = 0;
@@ -110,22 +111,22 @@ static int get_timeval(struct timeval *tv)
     {
         /* LOG_W will cause a recursive printing if ulog timestamp function is enabled */
         rt_kprintf("Cannot find a RTC device to provide time!\r\n");
-        return -1;
+        return -RT_ENOSYS;
     }
 
-    return (rst < 0) ? -1 : 1;
+    return rst;
 
 #else
     /* LOG_W will cause a recursive printing if ulog timestamp function is enabled */
     rt_kprintf("Cannot find a RTC device to provide time!\r\n");
-    return -1;
+    return -RT_ENOSYS;
 #endif /* RT_USING_RTC */
 }
 
 /**
  * Set time to RTC device (without timezone)
  * @param tv: struct timeval
- * @return -1 failure; 1 success
+ * @return the operation status, RT_EOK on successful
  */
 static int set_timeval(struct timeval *tv)
 {
@@ -134,7 +135,7 @@ static int set_timeval(struct timeval *tv)
     rt_err_t rst = -RT_ERROR;
 
     if (tv == RT_NULL)
-        return -1;
+        return -RT_EINVAL;
 
     /* optimization: find rtc device only first */
     if (device == RT_NULL)
@@ -155,14 +156,14 @@ static int set_timeval(struct timeval *tv)
     else
     {
         LOG_W("Cannot find a RTC device to provide time!");
-        return -1;
+        return -RT_ENOSYS;
     }
 
-    return (rst < 0) ? -1 : 1;
+    return rst;
 
 #else
     LOG_W("Cannot find a RTC device to provide time!");
-    return -1;
+    return -RT_ENOSYS;
 #endif /* RT_USING_RTC */
 }
 
@@ -294,7 +295,7 @@ RT_WEAK time_t time(time_t *t)
 {
     struct timeval now;
 
-    if(get_timeval(&now) > 0)
+    if(get_timeval(&now) == RT_EOK)
     {
         if (t)
         {
@@ -304,7 +305,7 @@ RT_WEAK time_t time(time_t *t)
     }
     else
     {
-        errno = EFAULT;
+        rt_set_errno(EFAULT);
         return ((time_t)-1);
     }
 }
@@ -322,18 +323,18 @@ int stime(const time_t *t)
 
     if (!t)
     {
-        errno = EFAULT;
+        rt_set_errno(EFAULT);
         return -1;
     }
 
     tv.tv_sec = *t;
-    if (set_timeval(&tv) > 0)
+    if (set_timeval(&tv) == RT_EOK)
     {
         return 0;
     }
     else
     {
-        errno = EFAULT;
+        rt_set_errno(EFAULT);
         return -1;
     }
 }
@@ -414,47 +415,53 @@ time_t timegm(struct tm * const t)
 }
 RTM_EXPORT(timegm);
 
-/* TODO: timezone */
+/* TODO: Daylight Saving Time */
 int gettimeofday(struct timeval *tv, struct timezone *tz)
 {
-    if (tv != RT_NULL && get_timeval(tv) > 0)
+    if(tz != RT_NULL)
+    {
+        tz->tz_dsttime = 0;
+        tz->tz_minuteswest = -(RT_LIBC_FIXED_TIMEZONE * 60);
+    }
+
+    if (tv != RT_NULL && get_timeval(tv) == RT_EOK)
     {
         return 0;
     }
     else
     {
-        errno = EFAULT;
+        rt_set_errno(EFAULT);
         return -1;
     }
 }
 RTM_EXPORT(gettimeofday);
 
-/* TODO: timezone */
+/* TODO: Daylight Saving Time */
 int settimeofday(const struct timeval *tv, const struct timezone *tz)
 {
     if (tv != RT_NULL)
     {
         if(tv->tv_sec >= 0 && tv->tv_usec >= 0)
         {
-            if(set_timeval((struct timeval *)tv) > 0)
+            if(set_timeval((struct timeval *)tv) == RT_EOK)
             {
                 return 0;
             }
             else
             {
-                errno = EFAULT;
+                rt_set_errno(EFAULT);
                 return -1;
             }
         }
         else
         {
-            errno = EINVAL;
+            rt_set_errno(EINVAL);
             return -1;
         }
     }
     else
     {
-        errno = EFAULT;
+        rt_set_errno(EFAULT);
         return -1;
     }
 }