相关疑难解决方法(0)

我在linux框中搜索并看到它是typedef

typedef __time_t time_t;

但找不到__time_t定义.

除了精度的差异,struct timeval和之间有什么区别struct timespec？如果我需要的精度低于μs(比如毫秒),为什么我要使用一个而不是另一个？

在我的编译器(ARM的gcc)上:

/* POSIX.1b structure for a time value.  This is like a `struct timeval' but
   has nanoseconds instead of microseconds.  */
struct timespec
  {
    __time_t tv_sec;        /* Seconds.  */
    __syscall_slong_t tv_nsec;  /* Nanoseconds.  */
  };

/* A time value that is accurate to the nearest
   microsecond but also has a range of years.  */
struct timeval
  {
    __time_t tv_sec;        /* Seconds.  */
    __suseconds_t tv_usec;  /* Microseconds.  */
  };

随着双方__syscall_slong_t并__suseconds_t定义为"长字".