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Resync new repository with old repo r5166
git-svn-id: http://svn.code.sf.net/p/nuttx/code/trunk@5153 42af7a65-404d-4744-a932-0658087f49c3
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patacongo
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/****************************************************************************
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* fs/fs_write.c
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*
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* Copyright (C) 2007-2009, 2012 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <sys/types.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <sched.h>
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#include <errno.h>
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#if defined(CONFIG_NET) && CONFIG_NSOCKET_DESCRIPTORS > 0
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# include <sys/socket.h>
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#endif
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#include "fs_internal.h"
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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#if CONFIG_NFILE_DESCRIPTORS > 0
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static inline ssize_t file_write(int fd, FAR const void *buf, size_t nbytes)
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{
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FAR struct filelist *list;
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FAR struct file *this_file;
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FAR struct inode *inode;
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int ret;
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int err;
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/* Get the thread-specific file list */
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list = sched_getfiles();
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if (!list)
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{
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err = EMFILE;
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goto errout;
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}
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/* Was this file opened for write access? */
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this_file = &list->fl_files[fd];
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if ((this_file->f_oflags & O_WROK) == 0)
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{
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err = EBADF;
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goto errout;
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}
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/* Is a driver registered? Does it support the write method? */
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inode = this_file->f_inode;
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if (!inode || !inode->u.i_ops || !inode->u.i_ops->write)
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{
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err = EBADF;
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goto errout;
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}
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/* Yes, then let the driver perform the write */
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ret = inode->u.i_ops->write(this_file, buf, nbytes);
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if (ret < 0)
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{
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err = -ret;
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goto errout;
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}
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return ret;
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errout:
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set_errno(err);
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return ERROR;
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}
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#endif
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/***************************************************************************
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* Name: write
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*
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* Description:
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* write() writes up to nytes bytes to the file referenced by the file
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* descriptor fd from the buffer starting at buf.
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*
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* Parameters:
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* fd file descriptor (or socket descriptor) to write to
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* buf Data to write
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* nbytes Length of data to write
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*
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* Returned Value:
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* On success, the number of bytes written are returned (zero indicates
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* nothing was written). On error, -1 is returned, and errno is set appro-
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* priately:
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*
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* EAGAIN
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* Non-blocking I/O has been selected using O_NONBLOCK and the write
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* would block.
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* EBADF
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* fd is not a valid file descriptor or is not open for writing.
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* EFAULT
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* buf is outside your accessible address space.
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* EFBIG
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* An attempt was made to write a file that exceeds the implementation
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* defined maximum file size or the process' file size limit, or
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* to write at a position past the maximum allowed offset.
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* EINTR
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* The call was interrupted by a signal before any data was written.
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* EINVAL
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* fd is attached to an object which is unsuitable for writing; or
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* the file was opened with the O_DIRECT flag, and either the address
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* specified in buf, the value specified in count, or the current
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* file offset is not suitably aligned.
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* EIO
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* A low-level I/O error occurred while modifying the inode.
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* ENOSPC
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* The device containing the file referred to by fd has no room for
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* the data.
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* EPIPE
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* fd is connected to a pipe or socket whose reading end is closed.
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* When this happens the writing process will also receive a SIGPIPE
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* signal. (Thus, the write return value is seen only if the program
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* catches, blocks or ignores this signal.)
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*
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* Assumptions:
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*
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********************************************************************************************/
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ssize_t write(int fd, FAR const void *buf, size_t nbytes)
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{
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/* Did we get a valid file descriptor? */
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#if CONFIG_NFILE_DESCRIPTORS > 0
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if ((unsigned int)fd >= CONFIG_NFILE_DESCRIPTORS)
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#endif
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{
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/* Write to a socket descriptor is equivalent to send with flags == 0 */
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#if defined(CONFIG_NET_TCP) && CONFIG_NSOCKET_DESCRIPTORS > 0
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return send(fd, buf, nbytes, 0);
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#else
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set_errno(EBADF);
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return ERROR;
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#endif
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}
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/* The descriptor is in the right range to be a file descriptor... write to the file */
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#if CONFIG_NFILE_DESCRIPTORS > 0
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return file_write(fd, buf, nbytes);
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#endif
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}
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