procfs.c

在Linux下实现文件的拷贝

#include <linux/kernel.h>
#include <linux/module.h>

#if CONFIG_MODVERSIONS == 1
#define MODVERSIONS
#include </zhangjian/ostask/linux-2.6.18/include/config/module/srcversion/modversions.h>
#endif

#include <linux/proc_fs.h>

#ifndef KERNEL_VERSION
#define KERNEL_VERSION(a,b,c) ((a)*65535+(b)*256+(c)
#endif

int procfile_read(char *buffer,char **buffer_location,off_t offset,int buffer_length,int zero)
{
   int len;
   static char my_buffer[80];
   static int count = 1;
   if(offset > 0)
     return 0; 
   len = sprintf(my_buffer,"For the %d%s time,go away!\n",count,
                        (count %100 > 10 && count %100 < 14)?"th":
                           (count % 10 == 1)? "st":
                              (count % 10 == 2)? "nd":
                                 (count % 10 == 3)?"rd":"th");

   count++;
   *buffer_location = my_buffer;
   return len;
}

struct proc_dir_entry Our_Proc_File={
         0 ,
        4 ,
   "test",
   S_IFREG | S_IRUGO,
        1 ,
        0 ,
        0 ,
        80 ,
   NULL ,
   procfile_read ,
   NULL
};

int init_module()
{
      # if LINUX_VERSION_CODE > KERNEL_VERSION(2,2,0)
return proc_register(&proc_root,&Our_Proc_File);
#else
   return proc_register_dynamic(&proc_root,&Our_Proc_File);
#endif
}

void clean_module()
{
     proc_unregister(&proc_root,&Our_Proc_File.low_ino);
}