pipe_space_for

函数名称：pipe_space_for_user - Return number of slots available to userspace*@head: The pipe ring head pointer*@tail: The pipe ring tail pointer*@pipe: The pipe info structure

函数原型：static inline unsigned int pipe_space_for_user(unsigned int head, unsigned int tail, struct pipe_inode_info *pipe)

返回类型：unsigned int

参数：

类型	参数	名称
unsigned int	head
unsigned int	tail
struct pipe_inode_info *	pipe

152

p_occupancy等于pipe_occupancy - Return number of slots used in the pipe*@head: The pipe ring head pointer*@tail: The pipe ring tail pointer

153

如果p_occupancy大于等于max_usage则返回:0

155

p_space等于ring_size减p_occupancy

156

如果p_space大于max_usage则p_space等于max_usage

158

返回:p_space

**调用者**
名称	描述
pipe_get_pages
pipe_get_pages_alloc
iov_iter_npages

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

函数逻辑报告