RTEMS: cpukit/include/rtems/pipe.h Source File

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pipe.h
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1
10/*
11 * Author: Wei Shen <cquark@gmail.com>
12 *
13 * The license and distribution terms for this file may be
14 * found in the file LICENSE in this distribution or at
15 * http://www.rtems.org/license/LICENSE.
16 */
17
18#ifndef _RTEMS_PIPE_H
19#define _RTEMS_PIPE_H
20
21#include <rtems/libio.h>
22#include <rtems/thread.h>
23
33#ifdef __cplusplus
34extern "C" {
35#endif
36
37/* Control block to manage each pipe */
38 typedef struct pipe_control {
39 char *Buffer;
40 unsigned int Size;
41 unsigned int Start;
42 unsigned int Length;
43 unsigned int Readers;
44 unsigned int Writers;
45 unsigned int waitingReaders;
46 unsigned int waitingWriters;
47 unsigned int readerCounter; /* incremental counters */
48 unsigned int writerCounter; /* for differentiation of successive opens */
49 rtems_mutex Mutex;
50 rtems_condition_variable readBarrier; /* wait queues */
51 rtems_condition_variable writeBarrier;
52#if 0
53 boolean Anonymous; /* anonymous pipe or FIFO */
54#endif
55} pipe_control_t;
56
65extern void pipe_release(
66 pipe_control_t **pipep,
67 rtems_libio_t *iop
68);
69
78extern int fifo_open(
79 pipe_control_t **pipep,
80 rtems_libio_t *iop
81);
82
88extern ssize_t pipe_read(
89 pipe_control_t *pipe,
90 void *buffer,
91 size_t count,
92 rtems_libio_t *iop
93);
94
100extern ssize_t pipe_write(
101 pipe_control_t *pipe,
102 const void *buffer,
103 size_t count,
104 rtems_libio_t *iop
105);
106
112extern int pipe_ioctl(
113 pipe_control_t *pipe,
114 ioctl_command_t cmd,
115 void *buffer,
116 rtems_libio_t *iop
117);
118
121#ifdef __cplusplus
122}
123#endif
124
125#endif
fifo_open
int fifo_open(pipe_control_t **pipep, rtems_libio_t *iop)
File system open. Interface to file system open.
Definition: fifo.c:196
pipe_ioctl
int pipe_ioctl(pipe_control_t *pipe, ioctl_command_t cmd, void *buffer, rtems_libio_t *iop)
File system Input/Output control.
Definition: fifo.c:397
pipe_write
ssize_t pipe_write(pipe_control_t *pipe, const void *buffer, size_t count, rtems_libio_t *iop)
File system write.
Definition: fifo.c:325
pipe_release
void pipe_release(pipe_control_t **pipep, rtems_libio_t *iop)
Release a pipe.
Definition: fifo.c:146
pipe_read
ssize_t pipe_read(pipe_control_t *pipe, void *buffer, size_t count, rtems_libio_t *iop)
File system read.
Definition: fifo.c:269
libio.h
Basic IO API.
pipe_control
Definition: pipe.h:38
rtems_libio_tt
An open file data structure.
Definition: libio.h:1320