testmycopy.c

使用内核编译的方法增加一个文件拷贝的系统调用

#include <linux/unistd.h>
#include <fcntl.h>
#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>

#define  __NR_mycopy		285
#define  MAXSIZE	100
_syscall3(int,mycopy,int,sflie,int,dfile,char *,buffer)

int main(int argc, char **argv)
{
int sfile, dfile;
char buffer[MAXSIZE];
if (argc != 3) 
	{
	    	printf( "参数错误\n");
	    	exit(-1);
     	 }
if ((sfile= open(argv[1], O_RDONLY)) == -1) 
	{
		printf( "文件打开失败\n");
		exit(-1);
     	}
if ((dfile =open(argv[2], O_WRONLY | O_CREAT, S_IRUSR | S_IWUSR)) == -1)
    	{
		printf("文件打开失败\n");
		exit(-1);
   	}
mycopy(sfile,dfile,buffer);  
return  0;
}