pipe.h File Reference

#include <core/system.h>
#include <fs/vfs.h>
#include <ds/ringbuf.h>

Go to the source code of this file.

Data Structures
struct	pipe
	A pipe, or a FIFO's pipe. More...

Macros
#define	PIPE_BUFLEN   1024

Functions
int	pipefs_pipe (struct file *read, struct file *write)
	Makes an anonymous pipe, for pipe(): one open file for each end.
int	pipefs_fifo_open (struct file *file)
	Opens a FIFO: the open file's vnode becomes an end of the FIFO's pipe, made by its first open.

Variables
struct fs	pipefs

Macro Definition Documentation

PIPE_BUFLEN

#define PIPE_BUFLEN   1024

Definition at line 14 of file pipe.h.

Referenced by pipefs_mkpipe().

Function Documentation

pipefs_fifo_open()

int pipefs_fifo_open

(

struct file *

file

)

Opens a FIFO: the open file's vnode becomes an end of the FIFO's pipe, made by its first open.

Opening for reading waits for a writer, and opening for writing for a reader, unless the file is non-blocking (then a writer without readers fails with ENXIO) or opened read-write (which is both).

Parameters

file	the open file, whose vnode is the FIFO; it's left as it was on failure

Returns

0, -ENXIO, -ENOMEM, or -ERESTARTSYS if a signal came while it waited

Definition at line 239 of file pipe.c.

References END_RDWR, END_READ, END_WRITE, pipe::fifo, vnode::fifo, file::flags, has_readers(), has_writers(), NULL, pipefs_end(), pipefs_fifo_open(), pipefs_mkpipe(), pipefs_pfree(), pipe::queue, pipe::r_opens, vnode::ref, vfs_close(), pipe::w_opens, waitq_sleep(), and waitq_wakeup().

Referenced by pipefs_fifo_open(), and vfs_file_open().

pipefs_pipe()

int pipefs_pipe	(	struct file *	read,
		struct file *	write )

Makes an anonymous pipe, for pipe(): one open file for each end.

Parameters

read	the open file for the reading end, its vnode set here
write	the open file for the writing end, its vnode and flags set here

Returns

0, -EINVAL, or -ENOMEM

Definition at line 199 of file pipe.c.

References END_READ, END_WRITE, file::flags, kfree(), NULL, pipefs_end(), pipefs_mkpipe(), pipefs_pfree(), and pipefs_pipe().

Referenced by pipefs_pipe(), and sys_pipe().

Variable Documentation

pipefs

struct fs pipefs

extern

Definition at line 308 of file pipe.c.

Referenced by pipefs_end().