7-1.c

《linux应用开发技术详解》的配套代码

#include<linux/unistd.h> /*定义宏_syscall1*/
#include<time.h>     /*定义类型time_t*/
_syscall1(time_t,time,time_t *,tloc)    /*宏，展开后得到time()函数的原型*/
main()
{        
time_t the_time;  
      the_time=time((time_t *)0); /*调用time系统调用*/   
      printf("The time is %ld\n",the_time);
}