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fix time() return value

This commit is contained in:
Meco Man 2021-02-11 13:41:24 +08:00
parent e3fee1ca77
commit dd147925e5
1 changed files with 5 additions and 4 deletions
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9
components/libc/compilers/common/time.c
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@ -174,23 +174,24 @@ double difftime (time_t tim1, time_t tim2)
* *
* @param time_t * t the timestamp pointer, if not used, keep NULL. * @param time_t * t the timestamp pointer, if not used, keep NULL.
* *
* @return time_t return timestamp current. * @return The value ((time_t)-1) is returned if the calendar time is not available.
* If timer is not a NULL pointer, the return value is also stored in timer.
* *
*/ */
RT_WEAK time_t time(time_t *t) RT_WEAK time_t time(time_t *t)
{ {
time_t time_now = 0; time_t time_now = ((time_t)-1); /* default is not available */
#ifdef RT_USING_RTC #ifdef RT_USING_RTC
static rt_device_t device = RT_NULL; static rt_device_t device = RT_NULL;
/* optimization: find rtc device only first. */ /* optimization: find rtc device only first */
if (device == RT_NULL) if (device == RT_NULL)
{ {
device = rt_device_find("rtc"); device = rt_device_find("rtc");
} }
/* read timestamp from RTC device. */ /* read timestamp from RTC device */
if (device != RT_NULL) if (device != RT_NULL)
{ {
if (rt_device_open(device, 0) == RT_EOK) if (rt_device_open(device, 0) == RT_EOK)