sudo echo 1 > /proc/sys/net/ipv4/ip_forward


write = prochello_write


#include <asm/uaccess.h>
static char kernel_buffer[256];
#define TEXT_GERMAN  "Hallo Welt"
#define TEXT_ENGLISH "Hello World"


proc_file = create_proc_entry("example_file", S_IRUGO, proc_dir );
if (proc_file) {
    proc_file->read_proc = proc_read;
    proc_file->data = NULL;
}


static struct file_operations example_proc_fops = {
    .owner = THIS_MODUL,
    .open = example_proc_open,
    .read = example_proc_read,
    .release = example_proc_release,
}

[...]

static int __init example_proc_init(void)
{
    proc_file = proc_create_data(    "example_file, S_IRUGO, proc_dir,
        &example-proc_fops, NULL );

[...]