diff options
Diffstat (limited to 'nuttx/fs')
| -rw-r--r-- | nuttx/fs/Makefile | 4 | ||||
| -rw-r--r-- | nuttx/fs/fs_fdopen.c | 184 |
2 files changed, 186 insertions, 2 deletions
diff --git a/nuttx/fs/Makefile b/nuttx/fs/Makefile index 3926cac2e..0810be494 100644 --- a/nuttx/fs/Makefile +++ b/nuttx/fs/Makefile @@ -47,8 +47,8 @@ else CSRCS += fs_open.c fs_close.c fs_read.c fs_write.c fs_ioctl.c \ fs_poll.c fs_select.c fs_lseek.c fs_dup.c fs_filedup.c \ fs_dup2.c fs_fcntl.c fs_filedup2.c fs_mmap.c fs_opendir.c \ - fs_closedir.c fs_stat.c fs_readdir.c fs_seekdir.c \ - fs_rewinddir.c fs_files.c fs_inode.c fs_inodefind.c fs_inodereserve.c \ + fs_closedir.c fs_stat.c fs_readdir.c fs_seekdir.c fs_rewinddir.c \ + fs_files.c fs_inode.c fs_fdopen.c fs_inodefind.c fs_inodereserve.c \ fs_statfs.c fs_inoderemove.c fs_registerdriver.c fs_unregisterdriver.c \ fs_inodeaddref.c fs_inoderelease.c CSRCS += fs_registerblockdriver.c fs_unregisterblockdriver.c \ diff --git a/nuttx/fs/fs_fdopen.c b/nuttx/fs/fs_fdopen.c new file mode 100644 index 000000000..d0a44f9e8 --- /dev/null +++ b/nuttx/fs/fs_fdopen.c @@ -0,0 +1,184 @@ +/**************************************************************************** + * fs/fs_fdopen.c + * + * Copyright (C) 2007-2011 Gregory Nutt. All rights reserved. + * Author: Gregory Nutt <spudmonkey@racsa.co.cr> + * + * 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. + * + ****************************************************************************/ + +/**************************************************************************** + * Included Files + ****************************************************************************/ + +#include <nuttx/config.h> + +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <semaphore.h> +#include <fcntl.h> +#include <errno.h> + +#include <nuttx/fs.h> + +/**************************************************************************** + * Private Functions + ****************************************************************************/ + +/**************************************************************************** + * Public Functions + ****************************************************************************/ + +/**************************************************************************** + * Name: fs_fdopen + ****************************************************************************/ + +FAR struct file_struct *fs_fdopen(int fd, int oflags, FAR _TCB *tcb) +{ + FAR struct filelist *flist; + FAR struct streamlist *slist; + FAR struct inode *inode; + FAR FILE *stream; + int err = OK; + int ret; + int i; + + /* Check input parameters */ + + if (fd < 0) + { + err = EBADF; + goto errout; + } + + /* A NULL TCB pointer means to use this threads TCB. This is a little + * hack the let's this function be called from user-space (via a syscall) + * without having access to the TCB. + */ + + if (!tcb) + { + tcb = sched_self(); + } + + /* Get the file and stream list from the TCB */ + + flist = tcb->filelist; + slist = tcb->streams; + + /* Get the inode associated with the file descriptor. This should + * normally be the case if fd >= 0. But not in the case where the + * called attempts to explictly stdin with fdopen(0) but stdin has + * been closed. + */ + + inode = flist->fl_files[fd].f_inode; + if (!inode) + { + err = ENOENT; + goto errout; + } + + /* Make sure that the inode supports the requested access. In + * the case of fdopen, we are not actually creating the file -- in + * particular w and w+ do not truncate the file and any files have + * already been created. + */ + + if (inode_checkflags(inode, oflags) != OK) + { + err = EACCES; + goto errout; + } + + /* Find an unallocated FILE structure */ + + ret = sem_wait(&slist->sl_sem); + if (ret != OK) + { + goto errout_with_errno; + } + + for (i = 0 ; i < CONFIG_NFILE_STREAMS; i++) + { + stream = &slist->sl_streams[i]; + if (stream->fs_filedes < 0) + { + /* Zero the structure */ +#if CONFIG_STDIO_BUFFER_SIZE > 0 + memset(stream, 0, sizeof(FILE)); +#elif CONFIG_NUNGET_CHARS > 0 + stream->fs_nungotten = 0; +#endif + +#if CONFIG_STDIO_BUFFER_SIZE > 0 + /* Initialize the semaphore the manages access to the buffer */ + + (void)sem_init(&stream->fs_sem, 0, 1); + + /* Allocate the IO buffer */ + + stream->fs_bufstart = malloc(CONFIG_STDIO_BUFFER_SIZE); + if (!stream) + { + err = ENOMEM; + goto errout_with_sem; + } + + /* Set up pointers */ + + stream->fs_bufend = &stream->fs_bufstart[CONFIG_STDIO_BUFFER_SIZE]; + stream->fs_bufpos = stream->fs_bufstart; + stream->fs_bufpos = stream->fs_bufstart; + stream->fs_bufread = stream->fs_bufstart; +#endif + /* Save the file description and open flags. Setting the + * file descriptor locks this stream. + */ + + stream->fs_filedes = fd; + stream->fs_oflags = oflags; + + sem_post(&slist->sl_sem); + return stream; + } + } + +#if CONFIG_STDIO_BUFFER_SIZE > 0 +errout_with_sem: +#endif + sem_post(&slist->sl_sem); + +errout: + set_errno(err); +errout_with_errno: + return NULL; +} + |