Linux call_usermodehelper()

先寫個簡單的例子

 

#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);

Makefile

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*