diff options
Diffstat (limited to 'nuttx/fs/fs_stat.c')
| -rw-r--r-- | nuttx/fs/fs_stat.c | 208 |
1 files changed, 208 insertions, 0 deletions
diff --git a/nuttx/fs/fs_stat.c b/nuttx/fs/fs_stat.c new file mode 100644 index 000000000..ac72658ba --- /dev/null +++ b/nuttx/fs/fs_stat.c @@ -0,0 +1,208 @@ +/**************************************************************************** + * fs_stat.c + * + * Copyright (C) 2007 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 Gregory Nutt 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 <sys/stat.h> +#include <string.h> +#include <sched.h> +#include <errno.h> +#include "fs_internal.h" + +/**************************************************************************** + * Private Functions + ****************************************************************************/ + +#if CONFIG_NFILE_DESCRIPTORS > 0 + +/**************************************************************************** + * Name: statpsuedo + ****************************************************************************/ + +static inline int statpsuedo(FAR struct inode *inode, FAR struct stat *buf) +{ + /* Most of the stat entries just do not apply */ + + memset(buf, 0, sizeof(struct stat) ); + if (inode->u.i_ops) + { + if (inode->u.i_ops->read) + { + buf->st_mode = S_IROTH|S_IRGRP|S_IRUSR; + } + + if (inode->u.i_ops->write) + { + buf->st_mode |= S_IWOTH|S_IWGRP|S_IWUSR; + } + + if (INODE_IS_MOUNTPT(inode)) + { + buf->st_mode |= S_IFDIR; + } + else if (INODE_IS_BLOCK(inode)) + { + /* What is it also has child inodes? */ + + buf->st_mode |= S_IFBLK; + } + else + { + /* What is it also has child inodes? */ + + buf->st_mode |= S_IFCHR; + } + } + else + { + /* If it has no operations, then it must just be a intermeidate + * node in the inode tree. It is something like a directory. + */ + + buf->st_mode |= S_IFDIR; + } + + return OK; +} + +/**************************************************************************** + * Global Functions + ****************************************************************************/ + +/**************************************************************************** + * Name: stat + * + * Return: Zero on success; -1 on failure with errno set: + * + * EACCES Search permission is denied for one of the directories in the + * path prefix of path. + * EFAULT Bad address. + * ENOENT A component of the path path does not exist, or the path is an + * empty string. + * ENOMEM Out of memory + * ENOTDIR A component of the path is not a directory. + * + ****************************************************************************/ + +int stat(const char *path, FAR struct stat *buf) +{ + FAR struct inode *inode; + const char *relpath = NULL; + int ret; + + /* Sanity checks */ + + if (!path || !buf) + { + ret = EFAULT; + goto errout; + } + + if (!path[0]) + { + ret = ENOENT; + goto errout; + } + + /* Get an inode for this file */ + + inode = inode_find(path, &relpath); + if (!inode) + { + /* This name does not refer to a psudeo-inode and there is no + * mountpoint that includes in this path. + */ + + ret = ENOENT; + goto errout; + } + + /* The way we handle the stat depends on the type of inode that we + * are dealing with. + */ + +#ifndef CONFIG_DISABLE_MOUNTPOUNT + if (INODE_IS_MOUNTPT(inode)) + { + /* The node is a file system mointpoint. Verify that the mountpoint + * supports the stat() method + */ + + if (inode->u.i_mops && inode->u.i_mops->stat) + { + /* Perform the rewinddir() operation */ + + ret = inode->u.i_mops->stat(inode, relpath, buf); + } + } + else +#endif + { + /* The node is part of the root psuedo file system */ + + ret = statpsuedo(inode, buf); + } + + /* Check if the stat operation was successful */ + + if (ret < 0) + { + ret = -ret; + goto errout_with_inode; + } + + /* Successfully stat'ed the file */ + + inode_release(inode); + return OK; + +/* Failure conditions always set the errno appropriately */ + + errout_with_inode: + inode_release(inode); + errout: + *get_errno_ptr() = ret; + return ERROR; +} + +#endif /* CONFIG_NFILE_DESCRIPTORS */ |