version.c

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#include <linux/fs.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#include <linux/utsname.h>

static int version_proc_show(struct seq_file *m, void *v)
{
    seq_printf(m, linux_proc_banner,
        utsname()->sysname,
        utsname()->release,
        utsname()->version);
    return 0;
}

static int version_proc_open(struct inode *inode, struct file *file)
{
    return single_open(file, version_proc_show, NULL);
}

static const struct file_operations version_proc_fops = {
    .open       = version_proc_open,
    .read       = seq_read,
    .llseek     = seq_lseek,
    .release    = single_release,
};

static int __init proc_version_init(void)
{
    proc_create("version", 0, NULL, &version_proc_fops);
    return 0;
}
module_init(proc_version_init);