警告:格式'%06d'期望类型'int'，但参数5有类型'__suseconds_t'

I am using this code:

我正在使用这段代码:

struct timeval tv;
time_t nowtime;
struct tm *nowtm;
char tmbuf[64], buf[64];

gettimeofday(&tv, NULL);
nowtime = tv.tv_sec;
nowtm = localtime(&nowtime);
strftime(tmbuf, sizeof tmbuf, "%Y-%m-%d %H:%M:%S", nowtm);
snprintf(buf, sizeof buf, "%s.%06d", tmbuf, tv.tv_usec);
struct tim