/*
* Copyright (c) 2011 Jiri Zarevucky
* Copyright (c) 2011 Petr Koupy
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* - Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* - 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.
* - The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
*/
/** @addtogroup libposix
* @{
*/
/** @file File status handling.
*/
#include "../internal/common.h"
#include <sys/stat.h>
#include <vfs/vfs.h>
#include <errno.h>
#include <mem.h>
/**
* Convert HelenOS stat struct into POSIX stat struct (if possible).
*
* @param dest POSIX stat struct.
* @param src HelenOS stat struct.
*
* @return 0 on success, -1 on error.
*/
static int stat_to_posix(struct stat *dest, vfs_stat_t *src)
{
memset(dest, 0, sizeof(struct stat));
dest->st_dev = src->service;
dest->st_ino = src->index;
/* HelenOS doesn't support permissions, so we set them all */
dest->st_mode = S_IRWXU | S_IRWXG | S_IRWXO;
if (src->is_file) {
dest->st_mode |= S_IFREG;
}
if (src->is_directory) {
dest->st_mode |= S_IFDIR;
}
dest->st_nlink = src->lnkcnt;
dest->st_size = src->size;
if (src->size > INT64_MAX) {
errno = ERANGE;
return -1;
}
return 0;
}
/**
* Retrieve file status for file associated with file descriptor.
*
* @param fd File descriptor of the opened file.
* @param st Status structure to be filled with information.
* @return Zero on success, -1 otherwise.
*/
int fstat(int fd, struct stat *st)
{
vfs_stat_t hst;
if (failed(vfs_stat(fd, &hst)))
return -1;
return stat_to_posix(st, &hst);
}
/**
* Retrieve file status for symbolic link.
*
* @param path Path to the symbolic link.
* @param st Status structure to be filled with information.
* @return Zero on success, -1 otherwise.
*/
int lstat(const char *restrict path, struct stat *restrict st)
{
/* There are currently no symbolic links in HelenOS. */
return stat(path, st);
}
/**
* Retrieve file status for regular file (or symbolic link target).
*
* @param path Path to the file/link.
* @param st Status structure to be filled with information.
* @return Zero on success, -1 otherwise.
*/
int stat(const char *restrict path, struct stat *restrict st)
{
vfs_stat_t hst;
if (failed(vfs_stat_path(path, &hst)))
return -1;
return stat_to_posix(st, &hst);
}
/**
* Change permission bits for the file if possible.
*
* @param path Path to the file.
* @param mode Permission bits to be set.
* @return Zero on success, -1 otherwise.
*/
int chmod(const char *path, mode_t mode)
{
/* HelenOS doesn't support permissions, return success. */
return 0;
}
/**
* Set the file mode creation mask of the process.
*
* @param mask Set permission bits are cleared in the related creation
* functions. Non-permission bits are ignored.
* @return Previous file mode creation mask.
*/
mode_t umask(mode_t mask)
{
/* HelenOS doesn't support permissions, return empty mask. */
return 0;
}
/**
* Create a directory.
*
* @param path Path to the new directory.
* @param mode Permission bits to be set.
* @return Zero on success, -1 otherwise.
*/
int mkdir(const char *path, mode_t mode)
{
if (failed(vfs_link_path(path, KIND_DIRECTORY, NULL)))
return -1;
else
return 0;
}
/** @}
*/