Hi friends.
I get this output when i do insmod with a module that
try to make a character device:
unresolved symbol module_unregister_chrdev
unresolved symbol module_register_chrdev
The code compile okey but with many warnings. This
is the module:
---------------------------------------------------------
/*
* chardev.c
* Copyright (C) 1998-1999 by Ori Pomerantz.
* Crea un dispositivo de carÃcter.
*/
#define __KERNEL__
#define MODULE
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/modversions.h>
#include <linux/fs.h>
#include <linux/wrapper.h>
#include <asm/uaccess.h>
#define SUCCESS 0
#define DEVICE_NAME "char_dev"
#define BUF_LEN 80
#define _LOOSE_KERNEL_NAMES
MODULE_LICENSE("GPL");
static int Device_Open = 0;
static char Message[BUF_LEN];
static char *Message_Ptr;
static int device_open(struct inode *inode, struct file *file)
{
static int counter = 0;
printk("Device: %d.%d\n", inode->i_rdev >> 8, inode->i_rdev & 0xFF);
if (Device_Open)
return -EBUSY;
Device_Open++;
sprintf(Message, "Si te lo dije una vez, te lo digo %d veces - %s", counter++, "Hola, mundo\n");
Message_Ptr = Message;
MOD_INC_USE_COUNT;
return SUCCESS;
}
static int device_release(struct inode *inode, struct file *file)
{
Device_Open --;
MOD_DEC_USE_COUNT;
return 0;
}
static ssize_t device_read(struct file *file, char *buffer, size_t length, loff_t *offset)
{
int bytes_read = 0;
if (*Message_Ptr == 0)
return 0;
while (length && *Message_Ptr)
{
put_user(*(Message_Ptr++), buffer++);
length --;
bytes_read ++;
}
return bytes_read;
}
static ssize_t device_write(struct file *file, const char *buffer, size_t length, loff_t *offset)
{
return -EINVAL;
}
static int Major;
struct file_operations Fops = { NULL, device_read, device_write, NULL, NULL, NULL, NULL, device_open, NULL, device_release };
int init_module()
{
Major = module_register_chrdev(0, DEVICE_NAME, &Fops);
if (Major < 0)
{
printk ("dispositivo %s fallà con %d\n", "Lo siento, registrando el carÃcter", Major);
return Major;
}
printk ("%s El nÃmero mayor del dispositivo es %d.\n", "El registro es un Ãxito.", Major);
printk ("si quieres hablar con el controlador del dispositivo,\n");
printk ("tendrÃs que crear un archivo de dispositivo. \n");
printk ("Te sugerimos que uses:\n");
printk ("mknod <nombre> c %d <menor>\n", Major);
printk ("Puedes probar diferentes nÃmeros menores %s", "y ver que pasa.\n");
return 0;
}
void cleanup_module()
{
int ret;
ret = module_unregister_chrdev(Major, DEVICE_NAME);
if (ret < 0)
printk("Error en unregister_chrdev: %d\n", ret);
}
-------------------------------------------------------------
ÂWhat is a "unresolved symbol"?
As ever, Thank you very much, in advance.
Regards.
Jose.
http://linuxespana.scripterz.org
FreeBSD RELEASE 4.8.
Mandrake Linux 9.1 Kernel 2.4.21 XFS.
Registered Linux User #213309.
Memories..... You are talking about memories.
Rick Deckard. Blade Runner.
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