O06 - proc

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通过proc文件系统配置

#include <linux/module.h>#include <linux/kernel.h>#include <linux/init.h>#include <linux/version.h>#include <linux/proc_fs.h>#include <linux/seq_file.h>static unsigned int variable;static struct proc_dir_entry *test_dir, *test_entry;#if LINUX_VERSION_CODE < KERNEL_VERSION(3, 10, 0)static int test_proc_read(char *buf, char **start, off_t off, int count,int *eof, void *data){unsigned int *ptr_var = data;return sprintf(buf, "test_rw = %u\n", *ptr_var);}static int test_proc_write(struct file *file, const char *buffer,unsigned long count, void *data){unsigned int *ptr_var = data;*ptr_var = simple_strtoul(buffer, NULL, 10);return count;}#elsestatic int test_proc_show(struct seq_file *seq, void *v){unsigned int *ptr_var = seq->private;seq_printf(seq, "%u\n", *ptr_var);return 0;}static ssize_t test_proc_write(struct file *file, const char __user *buffer,size_t count, loff_t *ppos){struct seq_file *seq = file->private_data;unsigned int *ptr_var = seq->private;*ptr_var = simple_strtoul(buffer, NULL, 10);return count;}static int test_proc_open(struct inode *inode, struct file *file){return single_open(file, test_proc_show, PDE_DATA(inode));}static const struct file_operations test_proc_fops ={.owner = THIS_MODULE,.open = test_proc_open,.read = seq_read,.write = test_proc_write,.llseek = seq_lseek,.release = single_release,};#endifstatic __init int test_proc_init(void){test_dir = proc_mkdir("test_dir", NULL);if (test_dir) {#if LINUX_VERSION_CODE < KERNEL_VERSION(3, 10, 0)test_entry = create_proc_entry("test_rw", 0666, test_dir);if (test_entry) {test_entry->nlink = 1;test_entry->data = &variable;test_entry->read_proc = test_proc_read;test_entry->write_proc = test_proc_write;return 0;}#elsetest_entry = proc_create_data("test_rw",0666, test_dir, &test_proc_fops, &variable);if (test_entry)return 0;#endif}return -ENOMEM;}module_init(test_proc_init);static __exit void test_proc_cleanup(void){remove_proc_entry("test_rw", test_dir);remove_proc_entry("test_dir", NULL);}module_exit(test_proc_cleanup);MODULE_AUTHOR("Barry Song <baohua@kernel.org>");MODULE_DESCRIPTION("proc exmaple");MODULE_LICENSE("GPL v2");

#Makefile##KVERS = $(shell uname -r)# Kernel modulesobj-m += proc.o# Specify flags for the module compilation.#EXTRA_CFLAGS=-g -O0build: kernel_moduleskernel_modules:make -C /lib/modules/$(KVERS)/build M=$(CURDIR) modulesclean:make -C /lib/modules/$(KVERS)/build M=$(CURDIR) clean

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