user-invoke.c

#include <linux/init.h>
#include <linux/module.h>
#include <linux/workqueue.h> /* for work queue */
#include <linux/kmod.h>

static struct delayed_work initiate_shutdown_work;

static void delayed_shutdown(struct work_struct *work)
{
    char *cmd = "/sbin/shutdown";
    char *argv[] = {
        cmd,
        "-h",
        "now",
        NULL,
    };
    char *envp[] = {
        "HOME=/",
        "PATH=/sbin:/bin:/usr/sbin:/usr/bin",
        NULL,
    };

    call_usermodehelper(cmd, argv, envp, 0);
}

static int __init my_shutdown_init( void )
{
    INIT_DELAYED_WORK(&initiate_shutdown_work, delayed_shutdown);
    schedule_delayed_work(&initiate_shutdown_work, msecs_to_jiffies(200));
    return 0;
}

static void __exit my_shutdown_exit( void )
{
    return;
}

module_init( my_shutdown_init );
module_exit( my_shutdown_exit );
MODULE_LICENSE("GPL");
MODULE_AUTHOR("John Madieu <john.madieu@gmail.com>");
MODULE_DESCRIPTION("Simple module that trigger a delayed shut down");