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Diffstat (limited to 'nuttx/drivers/pipes/pipe.c')
-rw-r--r--nuttx/drivers/pipes/pipe.c286
1 files changed, 0 insertions, 286 deletions
diff --git a/nuttx/drivers/pipes/pipe.c b/nuttx/drivers/pipes/pipe.c
deleted file mode 100644
index 20c160475..000000000
--- a/nuttx/drivers/pipes/pipe.c
+++ /dev/null
@@ -1,286 +0,0 @@
-/****************************************************************************
- * drivers/pipes/pipe.c
- *
- * Copyright (C) 2008-2009 Gregory Nutt. All rights reserved.
- * Author: Gregory Nutt <gnutt@nuttx.org>
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- *
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in
- * the documentation and/or other materials provided with the
- * distribution.
- * 3. Neither the name NuttX nor the names of its contributors may be
- * used to endorse or promote products derived from this software
- * without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
- * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
- * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
- * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
- * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
- * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
- * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
- * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
- * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
- * POSSIBILITY OF SUCH DAMAGE.
- *
- ****************************************************************************/
-
-/****************************************************************************
- * Compilation Switches
- ****************************************************************************/
-
-/****************************************************************************
- * Included Files
- ****************************************************************************/
-
-#include <nuttx/config.h>
-
-#include <sys/types.h>
-#include <nuttx/fs/fs.h>
-#include <stdio.h>
-#include <unistd.h>
-#include <semaphore.h>
-#include <fcntl.h>
-#include <errno.h>
-
-#include "pipe_common.h"
-
-#if CONFIG_DEV_PIPE_SIZE > 0
-
-/****************************************************************************
- * Definitions
- ****************************************************************************/
-
-#define MAX_PIPES 32
-
-/****************************************************************************
- * Private Types
- ****************************************************************************/
-
-/****************************************************************************
- * Private Function Prototypes
- ****************************************************************************/
-
-static int pipe_close(FAR struct file *filep);
-
-/****************************************************************************
- * Private Data
- ****************************************************************************/
-
-static const struct file_operations pipe_fops =
-{
- pipecommon_open, /* open */
- pipe_close, /* close */
- pipecommon_read, /* read */
- pipecommon_write, /* write */
- 0, /* seek */
- 0 /* ioctl */
-#ifndef CONFIG_DISABLE_POLL
- , pipecommon_poll /* poll */
-#endif
-};
-
-static sem_t g_pipesem = { 1 };
-static uint32_t g_pipeset = 0;
-static uint32_t g_pipecreated = 0;
-
-/****************************************************************************
- * Private Functions
- ****************************************************************************/
-
-/****************************************************************************
- * Name: pipe_allocate
- ****************************************************************************/
-
-static inline int pipe_allocate(void)
-{
- int pipeno;
- int ret = -ENFILE;
-
- for (pipeno = 0; pipeno < MAX_PIPES; pipeno++)
- {
- if ((g_pipeset & (1 << pipeno)) == 0)
- {
- g_pipeset |= (1 << pipeno);
- ret = pipeno;
- break;
- }
- }
-
- return ret;
-}
-
-/****************************************************************************
- * Name: pipe_free
- ****************************************************************************/
-
-static inline void pipe_free(int pipeno)
-{
- int ret = sem_wait(&g_pipesem);
- if (ret == 0)
- {
- g_pipeset &= ~(1 << pipeno);
- (void)sem_post(&g_pipesem);
- }
-}
-
-/****************************************************************************
- * Name: pipe_close
- ****************************************************************************/
-
-static int pipe_close(FAR struct file *filep)
-{
- struct inode *inode = filep->f_inode;
- struct pipe_dev_s *dev = inode->i_private;
- int ret;
-
- /* Some sanity checking */
-#if CONFIG_DEBUG
- if (!dev)
- {
- return -EBADF;
- }
-#endif
-
- /* Perform common close operations */
-
- ret = pipecommon_close(filep);
- if (ret == 0 && dev->d_refs == 0)
- {
- /* Release the pipe when there are no further open references to it. */
-
- pipe_free(dev->d_pipeno);
- }
-
- return ret;
-}
-
-/****************************************************************************
- * Public Functions
- ****************************************************************************/
-
-/****************************************************************************
- * Name: pipe
- *
- * Description:
- * pipe() creates a pair of file descriptors, pointing to a pipe inode, and
- * places them in the array pointed to by 'filedes'. filedes[0] is for reading,
- * filedes[1] is for writing.
- *
- * Inputs:
- * filedes[2] - The user provided array in which to catch the pipe file
- * descriptors
- *
- * Return:
- * 0 is returned on success; otherwise, -1 is returned with errno set
- * appropriately.
- *
- ****************************************************************************/
-
-int pipe(int filedes[2])
-{
- struct pipe_dev_s *dev = NULL;
- char devname[16];
- int pipeno;
- int err;
- int ret;
-
- /* Get exclusive access to the pipe allocation data */
-
- ret = sem_wait(&g_pipesem);
- if (ret < 0)
- {
- /* sem_wait() will have already set errno */
-
- return ERROR;
- }
-
- /* Allocate a minor number for the pipe device */
-
- pipeno = pipe_allocate();
- if (pipeno < 0)
- {
- (void)sem_post(&g_pipesem);
- err = -pipeno;
- goto errout;
- }
-
- /* Create a pathname to the pipe device */
-
- sprintf(devname, "/dev/pipe%d", pipeno);
-
- /* Check if the pipe device has already been created */
-
- if ((g_pipecreated & (1 << pipeno)) == 0)
- {
- /* No.. Allocate and initialize a new device structure instance */
-
- dev = pipecommon_allocdev();
- if (!dev)
- {
- (void)sem_post(&g_pipesem);
- err = ENOMEM;
- goto errout_with_pipe;
- }
-
- dev->d_pipeno = pipeno;
-
- /* Register the pipe device */
-
- ret = register_driver(devname, &pipe_fops, 0666, (void*)dev);
- if (ret != 0)
- {
- (void)sem_post(&g_pipesem);
- err = -ret;
- goto errout_with_dev;
- }
-
- /* Remember that we created this device */
-
- g_pipecreated |= (1 << pipeno);
- }
-
- (void)sem_post(&g_pipesem);
-
- /* Get a write file descriptor */
-
- filedes[1] = open(devname, O_WRONLY);
- if (filedes[1] < 0)
- {
- err = -filedes[1];
- goto errout_with_driver;
- }
-
- /* Get a read file descriptor */
-
- filedes[0] = open(devname, O_RDONLY);
- if (filedes[0] < 0)
- {
- err = -filedes[0];
- goto errout_with_wrfd;
- }
-
- return OK;
-
-errout_with_wrfd:
- close(filedes[1]);
-errout_with_driver:
- unregister_driver(devname);
-errout_with_dev:
- pipecommon_freedev(dev);
-errout_with_pipe:
- pipe_free(pipeno);
-errout:
- errno = err;
- return ERROR;
-}
-
-#endif /* CONFIG_DEV_PIPE_SIZE > 0 */
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