diff options
Diffstat (limited to 'nuttx/fs/fs_fsync.c')
-rw-r--r-- | nuttx/fs/fs_fsync.c | 138 |
1 files changed, 138 insertions, 0 deletions
diff --git a/nuttx/fs/fs_fsync.c b/nuttx/fs/fs_fsync.c new file mode 100644 index 000000000..877c33a83 --- /dev/null +++ b/nuttx/fs/fs_fsync.c @@ -0,0 +1,138 @@ +/**************************************************************************** + * fs/fs_fsync.c + * + * Copyright (C) 2007-2009 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. + * + ****************************************************************************/ + +/**************************************************************************** + * Included Files + ****************************************************************************/ + +#include <nuttx/config.h> + +#include <unistd.h> +#include <fcntl.h> +#include <errno.h> +#include <nuttx/fs/fs.h> +#include <nuttx/sched.h> + +#include "fs_internal.h" + +/**************************************************************************** + * Pre-processor Definitions + ****************************************************************************/ + +/**************************************************************************** + * Private Variables + ****************************************************************************/ + +/**************************************************************************** + * Public Variables + ****************************************************************************/ + +/**************************************************************************** + * Private Functions + ****************************************************************************/ + +/**************************************************************************** + * Public Functions + ****************************************************************************/ + +/**************************************************************************** + * Name: fsync + * + * Description: + * This func simply binds inode sync methods to the sync system call. + * + ****************************************************************************/ + +int fsync(int fd) +{ + FAR struct filelist *list; + FAR struct file *this_file; + struct inode *inode; + int ret; + + /* Get the thread-specific file list */ + + list = sched_getfiles(); + if (!list) + { + ret = EMFILE; + goto errout; + } + + /* Did we get a valid file descriptor? */ + + if ((unsigned int)fd >= CONFIG_NFILE_DESCRIPTORS) + { + ret = EBADF; + goto errout; + } + + /* Was this file opened for write access? */ + + this_file = &list->fl_files[fd]; + if ((this_file->f_oflags & O_WROK) == 0) + { + ret = EBADF; + goto errout; + } + + /* Is this inode a registered mountpoint? Does it support the + * sync operations may be relevant to device drivers but only + * the mountpoint operations vtable contains a sync method. + */ + + inode = this_file->f_inode; + if (!inode || !INODE_IS_MOUNTPT(inode) || + !inode->u.i_mops || !inode->u.i_mops->sync) + { + ret = EINVAL; + goto errout; + } + + /* Yes, then tell the mountpoint to sync this file */ + + ret = inode->u.i_mops->sync(this_file); + if (ret >= 0) + { + return OK; + } + + ret = -ret; + +errout: + set_errno(ret); + return ERROR; +} + |