前置知识:./标准IO
详细系统调用请查阅man手册
open()
打开文件
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   | # include <unistd.h>  # include <fcntl.>  # include <stdio.h>
  int main(int argc, char* argv[]) { 	int fd = open("./dict.txt",O_RDONLY);   	     if(fd==-1) 	{ 		printf("file open error!"); 	} 	close(fd);   	return 0; }
   | 
close()
关闭文件
见上述代码