syscp.c

文件拷贝 在linux环境下开发的程序 虽然很简单

asmlinkage int sys_copy(char *s,char *d)
{
   char buff[512];
   int source,dest;
   int num;
   mm_segment_t old_fs;
   old_fs=get_fs();
   set_fs(get_ds());  
    if((sourcefd=sys_open(s,O_RDONLY,0))<0)
       return -1;
    if((destfd=sys_open(d,O_CREAT | O_WRONLY | O_TRUNC,0))<0)  
        return -1;
    while((num=sys_read(source,buff,512))>0)
       {
         if((sys_write(dest,buff,num))!=num)
            return -1;
           }  
     sys_close(sourcefd);
     sys_close(destfd);
      set_fs(old_fs); 
     
     return 0;
 }