101 lines
3.2 KiB
C
101 lines
3.2 KiB
C
/* Copyright (c) 2010 The Chromium OS Authors. All rights reserved.
|
|
* Use of this source code is governed by a BSD-style license that can be
|
|
* found in the LICENSE file.
|
|
*
|
|
* Interface for root device discovery via sysfs with optional
|
|
* bells and whistles.
|
|
*/
|
|
#ifndef ROOTDEV_ROOTDEV_H_
|
|
#define ROOTDEV_ROOTDEV_H_
|
|
|
|
#include <stdbool.h>
|
|
#include <sys/types.h>
|
|
|
|
#ifdef __cplusplus
|
|
extern "C" {
|
|
#endif
|
|
|
|
/**
|
|
* rootdev: returns the path to the root device in @path
|
|
* @path: pre-allocated char array the result will be written to
|
|
* @size: size of @path
|
|
* @full: whether to try to do full resolution. E.g., device-mapper
|
|
* @strip: whether to remove the partition # or not.
|
|
*
|
|
* Returns 0 on success, non-zero on error.
|
|
*/
|
|
int rootdev(char *path, size_t size, bool full, bool strip);
|
|
|
|
/* All interface below this point will most definitely be C specific. If
|
|
* we rewrite this as a C++ class, only the above generic interface should
|
|
* still be provided.
|
|
*/
|
|
|
|
/**
|
|
* rootdev_wrapper: rootdev equivalent with paths can be substituted.
|
|
*/
|
|
int rootdev_wrapper(char *path, size_t size,
|
|
bool full, bool strip,
|
|
dev_t *dev,
|
|
const char *search, const char *dev_path);
|
|
/**
|
|
* rootdev_get_device: finds the /dev path for @dev
|
|
* @dst: destination char array
|
|
* @size: size of @dst
|
|
* @dev: dev_t specifying the known root device
|
|
* @search: path to search under. NULL for default.
|
|
*
|
|
* Returns 0 on success, non-zero on error.
|
|
*
|
|
* The name of the devices is placed in @dst. It will not
|
|
* be qualified with /dev/ by default.
|
|
*/
|
|
int rootdev_get_device(char *dst, size_t size, dev_t dev,
|
|
const char *search);
|
|
|
|
/**
|
|
* rootdev_get_device_slave: returns the first device under @device/slaves
|
|
* @slave: destination char array for storing the result
|
|
* @size: size of @slave
|
|
* @dev: pointer to a dev_t to populate
|
|
* @device: name of the device to probe, like "sdb"
|
|
* @search: path to search under. NULL for default.
|
|
*
|
|
* It is safe for @device == @slave.
|
|
*/
|
|
void rootdev_get_device_slave(char *slave, size_t size, dev_t *dev,
|
|
const char *device, const char *search);
|
|
|
|
/**
|
|
* rootdev_get_path: converts a device name to a path in the device tree
|
|
* @path: char array to store the path
|
|
* @size: size of @devpath
|
|
* @device: name of the device
|
|
* @dev_path: path to dev tree. NULL for default (/dev)
|
|
*
|
|
* A @dev of 0 is ignored.
|
|
*
|
|
* @path is populated for all return codes.
|
|
* Returns 0 on success and non-zero on error:
|
|
* -1 on unexpected errors (@path may be invalid)
|
|
*
|
|
* Nb, this function does NOT search /dev for a match. It performs a normal
|
|
* string concatenation.
|
|
* We can't check if the device actually exists as vendors may create an
|
|
* SELinux context we don't know about for it (in which case, this function
|
|
* would always fail).
|
|
*/
|
|
int rootdev_get_path(char *path, size_t size, const char *device,
|
|
const char *dev_path);
|
|
|
|
const char *rootdev_get_partition(const char *dst, size_t len);
|
|
void rootdev_strip_partition(char *dst, size_t len);
|
|
int rootdev_symlink_active(const char *path);
|
|
int rootdev_create_devices(const char *name, dev_t dev, bool symlink);
|
|
|
|
#ifdef __cplusplus
|
|
} /* extern "C" */
|
|
#endif
|
|
|
|
#endif /* ROOTDEV_ROOTDEV_H_ */
|