Linux call_usermodehelper()

#include <linux/init.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/kernel.h>
#include <linux/sched.h>

MODULE_LICENSE("DualBSD/GPL");

static __init int hello_init(void)
{
int result = 0;
char cmd_path[] = "/usr/bin/touch";
char *cmd_argv[] = {cmd_path, "/home/jjw/test.txt", NULL};
char *cmd_envp[] = {"HOME=/", "PATH=/sbin:/bin:/user/bin", NULL};

result = call_usermodehelper(cmd_path, cmd_argv, cmd_envp,
UMH_WAIT_PROC);
printk(KERN_DEBUG"THe result of call_usermodehelper is %d\n", result);
return result;
}

static __exit void hello_exit(void)
{
int result = 0;
char cmd_path[] = "/bin/rm";
char *cmd_argv[] = {cmd_path, "/home/jjw/test.txt", NULL};
char *cmd_envp[] = {"HOME=/", "PATH=/sbin:/bin:/user/bin", NULL};

result = call_usermodehelper(cmd_path, cmd_argv, cmd_envp,
UMH_WAIT_PROC);
printk(KERN_DEBUG"THe result of call_usermodehelper is %d\n", result);
}

module_init(hello_init);
module_exit(hello_exit);

obj-m := hello.o
KDIR := /lib/modules/$(shell uname -r)/build
PWD := $(shell pwd)
default:
$(MAKE) -C $(KDIR) SUBDIRS=$(PWD) modules
clean:
rm -rf *.o *.ko *.mod* *.order *.sym*