参考文章:
·Proc文件系统
内核proc文件系统与seq接口(4)---seq_file接口编程浅析
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/********************* proc文件系统 *************************/
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static void *scull_seq_start(struct seq_file *s, loff_t *pos)
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{
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if (*pos >= MEMDEV_NR_DEVS)
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return NULL; /* No more to read */
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return my_devices + *pos;
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}
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static void *scull_seq_next(struct seq_file *s, void *v, loff_t *pos)
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{
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(*pos)++;
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if (*pos >= MEMDEV_NR_DEVS)
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return NULL;
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return my_devices + *pos;
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}
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static void scull_seq_stop(struct seq_file *s, void *v)
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{ /* Actually, there's nothing to do here */}
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static int scull_seq_show(struct seq_file *s, void *v)
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{
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struct mem_dev *dev = (struct mem_dev *) v;
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seq_printf(s, "%d-%d: %s\n",MAJOR((dev->cdev).dev),MINOR((dev->cdev).dev),dev->data);
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return 0;
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}
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static struct seq_operations mem_seq_ops = {
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.start = scull_seq_start,
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.next = scull_seq_next,
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.stop = scull_seq_stop,
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.show = scull_seq_show
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};
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static int mem_proc_open(struct inode *inode, struct file *file)
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{
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return seq_open(file, &mem_seq_ops);
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}
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static struct file_operations mem_proc_ops = {
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.owner = THIS_MODULE,
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.open = mem_proc_open, /* 只要实现这个函数 */
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.read = seq_read,
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.llseek = seq_lseek,
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.release = seq_release
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};
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static struct proc_dir_entry *mydir, *pfile;
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static int mem_create_proc(void)
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{
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mydir = proc_mkdir("mydir", NULL); // 创建目录
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if (!mydir) {
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printk(KERN_ERR "Can't create /proc/mydir\n");
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return -1;
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}
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pfile = create_proc_entry("pool", 0666, mydir); // 创建文件
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if (!pfile) {
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printk(KERN_ERR "Can't create /proc/mydir/pool\n");
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remove_proc_entry("mydir", NULL);
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return -1;
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}
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else
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pfile->proc_fops = &mem_proc_ops;
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return 0;
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}
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static void mem_remove_proc(void)
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{
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remove_proc_entry("pool", mydir);
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remove_proc_entry("mydir", NULL);
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}
源码: test.rar
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