Hi,
I am writing a module to Create a char device region through
following program.
#include <linux/module.h>
#include <linux/init.h>
#include <linux/types.h>
#include <linux/fs.h>
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("CHAR DEV1");
MODULE_AUTHOR("RAJA");
#define NAME "chardev1"
static int __init init_module4(void);
static void __exit exit_module4(void);
dev_t start = 255;
unsigned int count = 10;
static int __init init_module4()
{
printk("Hello World 4 \n");
int ret_val = register_chrdev_region(start,count,NAME);
if(ret_val)
printk("Error Occured In Registering Char Devices\n");
else
printk("SUCCESS: created Char Devices\n");
return 0;
}
static void __exit exit_module4()
{
printk("Cruel World ! Bye\n");
unregister_chrdev_region(start,count);
}
module_init(init_module4);
module_exit(exit_module4);
but
after insmod i am seeing /proc/devices for the devices that are created
but there is only one entry with name
chardev1 with major number 254
and when i use rmmod
in the kernel log it is comming as bad EIP
and when i try to see /proc/devices by
vi /proc/devices it is comming segmentation fault.
Would you please tell me why its comming like that?
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