time_t的定义

找了半天，linux中time_t的定义，真牛逼。。。。

1、 time.h

line77 typedef __time_t time_t;

line116 # include <bits/types.h> /* This defines __time_t for us. */

2、bit/types.h

l139: __STD_TYPE __TIME_T_TYPE __time_t; /* Seconds since the Epoch. */

# define __STD_TYPE __extension__ typedef

3、#include <bits/typesizes.h>

#define __TIME_T_TYPE __SYSCALL_SLONG_TYPE

# define __SYSCALL_SLONG_TYPE __SLONGWORD_TYPE

4、bit/types.h

#define __SLONGWORD_TYPE long int

所以time_t是long int型。