创建proc中的节点

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

#define CUTBAG_DIR "CU_T-bagwell"
#define CUTBAG_NODE "test_node"

struct proc_dir_entry *cutbag_dir;

static int __init test_init(void)
{
        int retval = 0;
        struct proc_dir_entry *ent;

        cutbag_dir = proc_mkdir(CUTBAG_DIR, NULL);
        if(cutbag_dir == NULL){
                printk(KERN_WARNING "%s create error\n", CUTBAG_DIR);
                return -1;
        }

        ent = create_proc_entry(CUTBAG_NODE, 0, cutbag_dir);
        if(ent == NULL){
                printk(KERN_WARNING, "%s create error\n", CUTBAG_NODE);
                goto CREATE_NODE_ERR;
        }
        return 0;


CREATE_NODE_ERR:

        remove_proc_entry(CUTBAG_DIR, 0);
        return -1;

}

static void __exit test_cleanup(void)
{
                remove_proc_entry(CUTBAG_NODE, cutbag_dir);
                remove_proc_entry(CUTBAG_DIR, 0);
}


module_init(test_init);
module_exit(test_cleanup);

MODULE_LICENSE("GPL");


创建一个/proc下的目录

创建一个/proc下的目录下的一个文件

下面是Makefile

KERNELDIR = /usr/src/kernels/`uname -r`
PWD := $(shell pwd)
obj-m := proc_mkdir.o

modules:
        $(MAKE) -C $(KERNELDIR) M=$(PWD) modules
clean:
        rm -rf *.o *.ko Module.* module* *.mod.c