simple_attr_open

函数名称：simple_attr_open is called by an actual attribute open file operation* to set the attribute specific access operations.

函数原型：int simple_attr_open(struct inode *inode, struct file *file, int (*get)(void *, u64 *), u64int (*set)(void *, ), const char *fmt)

返回类型：int

参数：

类型	参数	名称
struct inode *	inode
struct file *	file
int (*	get
int (*	set
const char *	fmt

824

attr等于开辟内存

825

如果非attr则返回:负ENOMEM

828

get等于get

829

set等于set

830

data等于s or device private pointer

831

rmat for read operation 等于fmt

832

mutex_init - initialize the mutex*@mutex: the mutex to be initialized* Initialize the mutex to unlocked state.* It is not allowed to initialize an already locked mutex.( & protects access to these buffers )

834

needed for tty driver, and maybe others 等于attr

836

返回:This is used by subsystems that don't want seekable* file descriptors. The function is not supposed to ever fail, the only* reason it returns an 'int' and not 'void' is so that it can be plugged* directly into file_operations structure.

**调用者**
名称	描述
unpoison_fops_open
cma_debugfs_fops_open
cma_used_fops_open
cma_maxchunk_fops_open
cma_free_fops_open
cma_alloc_fops_open
fops_errno_open
fei_retval_ops_open

源代码转换工具开放的插件接口	X
支持：c/c++/esqlc/java Oracle/Informix/Mysql 插件可实现：逻辑报告代码生成和批量转换代码