create_proc_read_entry用法

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

static int sky_call(char *buf, char **start, off_t off,
                        int count, int *eof, void *data)
{
        int len = 0;

        len = sprintf(buf + len, "%s", "hello china\n");
        len += sprintf(buf + len, "%s", "hello world\n");

        return len;
}

static int __init sky_init(void)
{
        struct proc_dir_entry *entry;

        entry = create_proc_read_entry("sky", 0, NULL, sky_call, NULL);
        if (!entry)
        {
                goto create_err;
        }

        return 0;
create_err:
        return -1;
}

static void __exit sky_exit(void)
{
        remove_proc_entry("sky", NULL);
}

module_init(sky_init);
module_exit(sky_exit);
MODULE_LICENSE("GPL");