作者：BuauOoO_987 | 来源：互联网 | 2017-09-29 23:42
这两天一直看LDD3，看的很爽，似懂非懂的样子，今天开始编译例程代码scull的时候，悲剧很大，折腾了很久，主要是我Ubuntu11.04的内核版本是2.6.38，而例程编译的内核版本是2.6.10，这中间内核本身已经发生了翻天覆地的变化。说白了，能make过去，那才出鬼了，好吧，一个错误一个错误来，不急。
这两天一直看LDD3，看的很爽，似懂非懂的样子，今天开始编译例程代码scull的时候，悲剧很大，折腾了很久，主要是我Ubuntu 11.04的内核版本是2.6.38，而例程编译的内核版本是2.6.10，这中间内核本身已经发生了翻天覆地的变化。说白了，能make过去，那才出鬼了，好吧，一个错误一个错误来，不急。
直接make，第一个问题来了。。。。
根据提示把Makefile里的CFLAGS 改成EXTRA_CFLAGS 即可，继续……
提示：
如果您使用的是vi，可以和我一样一道命令解决:0,$s/CFLAGS/EXTRA_CFLAGS/g
别忘了保存，继续make……
第二个问题来了。。。。
好吧，我不理解了，讲驱动最常见的ioctl 你不认识，why？
原来在2.6.36版本更新中，file_operations发生了很大的变化，去掉了ioctl，而加入了两个新函数
- long (*unlocked_ioctl) (struct file *, unsigned int, unsigned long);
- long (*compat_ioctl) (struct file *, unsigned int, unsigned long);
注：2.6.38的file_operation结构体
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- struct file_operations {
- struct module *owner;
- loff_t (*llseek) (struct file *, loff_t, int);
- ssize_t (*read) (struct file *, char __user *, size_t, loff_t *);
- ssize_t (*write) (struct file *, const char __user *, size_t, loff_t *);
- ssize_t (*aio_read) (struct kiocb *, const struct iovec *, unsigned long, loff_t);
- ssize_t (*aio_write) (struct kiocb *, const struct iovec *, unsigned long, loff_t);
- int (*readdir) (struct file *, void *, filldir_t);
- unsigned int (*poll) (struct file *, struct poll_table_struct *);
- long (*unlocked_ioctl) (struct file *, unsigned int, unsigned long);
- long (*compat_ioctl) (struct file *, unsigned int, unsigned long);
- int (*mmap) (struct file *, struct vm_area_struct *);
- int (*open) (struct inode *, struct file *);
- int (*flush) (struct file *, fl_owner_t id);
- int (*release) (struct inode *, struct file *);
- int (*fsync) (struct file *, int datasync);
- int (*aio_fsync) (struct kiocb *, int datasync);
- int (*fasync) (int, struct file *, int);
- int (*lock) (struct file *, int, struct file_lock *);
- ssize_t (*sendpage) (struct file *, struct page *, int, size_t, loff_t *, int);
- unsigned long (*get_unmapped_area)(struct file *, unsigned long, unsigned long, unsigned long, unsigned long);
- int (*check_flags)(int);
- int (*flock) (struct file *, int, struct file_lock *);
- ssize_t (*splice_write)(struct pipe_inode_info *, struct file *, loff_t *, size_t, unsigned int);
- ssize_t (*splice_read)(struct file *, loff_t *, struct pipe_inode_info *, size_t, unsigned int);
- int (*setlease)(struct file *, long, struct file_lock **);
- long (*fallocate)(struct file *file, int mode, loff_t offset,
- loff_t len);
- };
问题找到了，那么怎么解决呢？在main.c 文件中：
按照我下面的代码这样改就OK了。
- * The unlocked_ioctl() implementation
- */
- int scull_unlocked_ioctl(struct file *filp,
- unsigned int cmd, unsigned long arg)
还有在file_operation 赋值处修改如下：
- struct file_operations scull_fops = {
- .owner = THIS_MODULE,
- .llseek = scull_llseek,
- .read = scull_read,
- .write = scull_write,
- .unlocked_ioctl = scull_unlocked_ioctl,
- .open = scull_open,
- .release = scull_release,
- };
在pipe.c 和scull.h 以及access.h 中也类似修改。
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