splice_pipe_to

函数名称：splice_pipe_to_pipe

函数原型：static int splice_pipe_to_pipe(struct pipe_inode_info *ipipe, struct pipe_inode_info *opipe, size_t len, unsigned int flags)

返回类型：int

参数：

类型	参数	名称
struct pipe_inode_info *	ipipe
struct pipe_inode_info *	opipe
size_t	len
unsigned int	flags

1572

如果非readers则

1573

send_sig(SIGPIPE, 当前进程, 0)

1574

如果非ret则ret等于负EPIPE

1576

退出

1579

i_head等于head

1580

o_tail等于tail

1582

如果pipe_empty - Return true if the pipe is empty*@head: The pipe ring head pointer*@tail: The pipe ring tail pointer且非writers则退出

1589

如果pipe_empty - Return true if the pipe is empty*@head: The pipe ring head pointer*@tail: The pipe ring tail pointer或pipe_full - Return true if the pipe is full*@head: The pipe ring head pointer*@tail: The pipe ring tail pointer*@limit: The maximum amount of slots available.则

1592

如果ret则退出

1595

如果flags按位与don't block on the pipe splicing (but 则

1596

ret等于负EAGAIN

1597

退出

1605

pipe_unlock(ipipe)

1606

pipe_unlock(opipe)

1607

转到:retry

1610

ibuf等于bufs[i_tail & i_mask]

1611

obuf等于bufs[o_head & o_mask]

1613

如果len大于等于len则

1617

obuf等于ibuf

1618

ops = NULL

1619

i_tail自加

1620

tail等于i_tail

1621

input_wakeup = true

1622

o_len等于len

1623

o_head自加

1624

head等于o_head

1625

否则

1630

如果非pipe_buf_get - get a reference to a pipe_buffer*@pipe: the pipe that the buffer belongs to*@buf: the buffer to get a reference to* Return: %true if the reference was successfully obtained.则

1631

如果ret恒等于0则ret等于负EFAULT

1633

退出

1635

obuf等于ibuf

1641

flags与等于page is a gift 的反

1643

pipe_buf_mark_unmergeable - mark a &struct pipe_buffer as unmergeable*@buf: the buffer to mark* Description:* This function ensures that no future writes will be merged into the* given &struct pipe_buffer. This is necessary when multiple pipe buffers

1645

len等于len

1646

offset加等于len

1647

len减等于len

1648

o_len等于len

1649

o_head自加

1650

head等于o_head

1652

ret加等于o_len

1653

len减等于o_len

函数逻辑报告