驱动或应用中获取时间戳的接口。
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <sys/time.h>
#if 0
#include <linux/ktime.h>
/* 内核驱动中获取时间戳 */
static ktime_t get_kernel_timestamp(void)
{
ktime_t ktime = ktime_get(); // 获取当前时间
u64 timestamp = ktime_to_ns(ktime); // 将ktime转换为纳秒时间戳
printk(KERN_INFO "Current timestamp: %llu nanoseconds\n", timestamp);
return ktime;
}
#endif
int convert_utc_time( unsigned long long utc, char * ptime)
{
struct tm *tm;
time_t t = 0;
if (utc == 0) {
strncpy(ptime, "no time", 8);
return -1;
}
t = utc / 1000 + 8 * 3600;
tm = gmtime(&t);
sprintf(ptime, "%04d:%02d:%02d %02d:%02d:%02d.%03d", tm->tm_year+1900, tm->tm_mon+1, tm->tm_mday,
tm->tm_hour, tm->tm_min, tm->tm_sec, (int)utc%1000);
printf("utc time for ac debug : %s\n", ptime);
return 0;
}
static unsigned long long GetSystemClock_ns()
{
struct timespec time_start, time_end;
clock_gettime(CLOCK_REALTIME, &time_start);
return (long long unsigned)time_start.tv_sec * 1000000000 + (long long unsigned)time_start.tv_nsec;
}
static inline struct timeval AC_TIME_COMMON_GetMonotonic()
{
struct timespec stTime;
struct timeval stRet;
clock_gettime(CLOCK_REALTIME, &stTime);
stRet.tv_sec = stTime.tv_sec - timezone;
stRet.tv_usec = stTime.tv_nsec/1000;
return stRet;
}
static unsigned long long GetSystemClock()
{
struct timeval tv;
unsigned long long tv_sen;
unsigned long long gltime;
gettimeofday(&tv, NULL);
tv_sen = tv.tv_sec;
gltime = tv_sen * 1000 + tv.tv_usec / 1000;
return gltime;
}
int main()
{
char u_time32 = {0};
unsigned long long system_time = 0;
struct timeval tmData = AC_TIME_COMMON_GetMonotonic();
system_time = tmData.tv_sec*1000 + tmData.tv_usec / 1000;
printf("get time %lld\n", system_time); // 1655445920614 : 2022:06:17 14:05:20.654
system_time = 0;
system_time = GetSystemClock();
printf("get time %lld\n", system_time); // 1655446828225 : 2022:06:17 14:20:28.265
system_time = 0;
system_time = GetSystemClock_ns(); // 1721875113493839086
printf("get time %lld\n", system_time);
convert_utc_time(1655356228, u_time);
convert_utc_time(1823430235, u_time);
convert_utc_time(1918628771, u_time);
convert_utc_time(1655445920614, u_time); // 2022:06:17 14:05:20.654
convert_utc_time(1655446828225, u_time); // 2022:06:17 14:20:28.265
}