Efun 函数系统time_ns本页总览time_ns NAME time_ns() - return the number of nanoseconds since January 1, 1970 SYNOPSIS int time_ns( void ); DESCRIPTION Return the number of nanoseconds since midnight (GMT) January 1, 1970. SEE ALSO time(3), ctime(3), localtime(3), time_expression(3), uptime(3)