time_t
/usr/include/time.h
typedef __time_t time_t;
/usr/include/bits/time.h
struct timeval
{
__time_t tv_sec; /* Seconds. */
__suseconds_t tv_usec; /* Microseconds. */
};
/usr/include/bits/types.h
__STD_TYPE __TIME_T_TYPE __time_t; /* Seconds since the Epoch. */
__STD_TYPE __USECONDS_T_TYPE __useconds_t; /* Count of microseconds. */
__STD_TYPE __SUSECONDS_T_TYPE __suseconds_t; /* Signed count of microseconds. */
/usr/include/bits/typesizes.h
#define __TIME_T_TYPE __SLONGWORD_TYPE
#define __USECONDS_T_TYPE __U32_TYPE
#define __SUSECONDS_T_TYPE __SLONGWORD_TYPE
/usr/include/bits/types.h
#define __S16_TYPE short int
#define __U16_TYPE unsigned short int
#define __S32_TYPE int
#define __U32_TYPE unsigned int
#define __SLONGWORD_TYPE long int
#define __ULONGWORD_TYPE unsigned long int
time_t 对应的 printf 格式符 - PRId64(也可以用 "zu", 但是可能不兼容，不推荐)
size_t
/usr/lib/gcc/x86_64-redhat-linux/4.4.4/include/stddef.h
#ifndef __SIZE_TYPE__
#define __SIZE_TYPE__ long unsigned int
#endif
#if !(defined (__GNUG__) && defined (size_t))
typedef __SIZE_TYPE__ size_t;
#ifdef __BEOS__
typedef long ssize_t;
#endif /* __BEOS__ */
#endif /* !(defined (__GNUG__) && defined (size_t)) */
size_t 对应的 printf 格式符 - PRId64(也可以用 "zu", 但是可能不兼容，不推荐)
