xref: /foundation/multimodalinput/input/libudev/include/libudev.h (revision c29fa5a6)

/*
 * Copyright (c) 2023 Huawei Device Co., Ltd.
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#ifndef LIBUDEV_H
#define LIBUDEV_H

#pragma once

#include <stdarg.h>
#include <sys/sysmacros.h>
#include <sys/types.h>
#include <sys/stat.h>

#ifdef __cplusplus
extern "C" {
#endif // __cplusplus

/**
 * udev - library context
 *
 * reads the udev config and system environment
 * allows custom logging
 */
struct udev;
struct udev *udev_ref(struct udev *udev);
struct udev *udev_unref(struct udev *udev);
struct udev *udev_new(void);
void udev_set_log_fn(struct udev *udev, void (*log_fn)(struct udev *udev, int priority, const char *file, int line,
                                            const char *fn, const char *format, va_list args))
    __attribute__((deprecated));
int udev_get_log_priority(struct udev *udev) __attribute__((deprecated));
void udev_set_log_priority(struct udev *udev, int priority) __attribute__((deprecated));
void *udev_get_userdata(struct udev *udev);
void udev_set_userdata(struct udev *udev, void *userdata);

/**
 * udev_list access to libudev generated lists
 */
struct udev_list_entry;
struct udev_list_entry *udev_list_entry_get_next(struct udev_list_entry *list_entry);
struct udev_list_entry *udev_list_entry_get_by_name(struct udev_list_entry *list_entry, const char *name);
const char *udev_list_entry_get_name(struct udev_list_entry *list_entry);
const char *udev_list_entry_get_value(struct udev_list_entry *list_entry);

/**
 * udev_list_entry_foreach:
 * @list_entry: entry to store the current position
 * @first_entry: first entry to start with
 *
 * Helper to iterate over all entries of a list.
 */
#define udev_list_entry_foreach(list_entry, first_entry) \
    for (list_entry = first_entry; list_entry != NULL; list_entry = udev_list_entry_get_next(list_entry))

/**
 * udev_device access to sysfs/kernel devices
 */
struct udev_device;
struct udev_device *udev_device_ref(struct udev_device *udev_device);
struct udev_device *udev_device_unref(struct udev_device *udev_device);
struct udev *udev_device_get_udev(struct udev_device *udev_device);
struct udev_device *udev_device_new_from_syspath(struct udev *udev, const char *syspath);
struct udev_device *udev_device_new_from_devnum(struct udev *udev, char type, dev_t devnum);
struct udev_device *udev_device_new_from_subsystem_sysname(
    struct udev *udev, const char *subsystem, const char *sysname);
struct udev_device *udev_device_new_from_device_id(struct udev *udev, const char *id);
struct udev_device *udev_device_new_from_environment(struct udev *udev);

/**
 * udev_device_get_parent_*() does not take a reference on the returned device, it is automatically unref'd with the
 * parent
 */
struct udev_device *udev_device_get_parent(struct udev_device *udev_device);
struct udev_device *udev_device_get_parent_with_subsystem_devtype(
    struct udev_device *udev_device, const char *subsystem, const char *devtype);

/* retrieve device properties */
int udev_device_read_db(struct udev_device *udev_device);
const char *udev_device_get_devpath(struct udev_device *udev_device);
const char *udev_device_get_subsystem(struct udev_device *udev_device);
const char *udev_device_get_devtype(struct udev_device *udev_device);
const char *udev_device_get_syspath(struct udev_device *udev_device);
const char *udev_device_get_sysname(struct udev_device *udev_device);
const char *udev_device_get_sysnum(struct udev_device *udev_device);
const char *udev_device_get_devnode(struct udev_device *udev_device);
int udev_device_get_is_initialized(struct udev_device *udev_device);
struct udev_list_entry *udev_device_get_devlinks_list_entry(struct udev_device *udev_device);
struct udev_list_entry *udev_device_get_properties_list_entry(struct udev_device *udev_device);
struct udev_list_entry *udev_device_get_tags_list_entry(struct udev_device *udev_device);
struct udev_list_entry *udev_device_get_sysattr_list_entry(struct udev_device *udev_device);
const char *udev_device_get_property_value(struct udev_device *udev_device, const char *key);
const char *udev_device_get_driver(struct udev_device *udev_device);
dev_t udev_device_get_devnum(struct udev_device *udev_device);
const char *udev_device_get_action(struct udev_device *udev_device);
unsigned long long int udev_device_get_seqnum(struct udev_device *udev_device);
unsigned long long int udev_device_get_usec_since_initialized(struct udev_device *udev_device);
const char *udev_device_get_sysattr_value(struct udev_device *udev_device, const char *sysattr);
int udev_device_set_sysattr_value(struct udev_device *udev_device, const char *sysattr, char *value);
int udev_device_has_tag(struct udev_device *udev_device, const char *tag);

/**
 * udev_monitor access to kernel uevents and udev events
 */
struct udev_monitor;
struct udev_monitor *udev_monitor_ref(struct udev_monitor *udev_monitor);
struct udev_monitor *udev_monitor_unref(struct udev_monitor *udev_monitor);
struct udev *udev_monitor_get_udev(struct udev_monitor *udev_monitor);
/* kernel and udev generated events over netlink */
struct udev_monitor *udev_monitor_new_from_netlink(struct udev *udev, const char *name);
/* bind socket */
int udev_monitor_enable_receiving(struct udev_monitor *udev_monitor);
int udev_monitor_set_receive_buffer_size(struct udev_monitor *udev_monitor, int size);
int udev_monitor_get_fd(struct udev_monitor *udev_monitor);
struct udev_device *udev_monitor_receive_device(struct udev_monitor *udev_monitor);
/* in-kernel socket filters to select messages that get delivered to a listener */
int udev_monitor_filter_add_match_subsystem_devtype(
    struct udev_monitor *udev_monitor, const char *subsystem, const char *devtype);
int udev_monitor_filter_add_match_tag(struct udev_monitor *udev_monitor, const char *tag);
int udev_monitor_filter_update(struct udev_monitor *udev_monitor);
int udev_monitor_filter_remove(struct udev_monitor *udev_monitor);

/**
 * udev_enumerate search sysfs for specific devices and provide a sorted list
 */
struct udev_enumerate;
struct udev_enumerate *udev_enumerate_ref(struct udev_enumerate *udev_enumerate);
struct udev_enumerate *udev_enumerate_unref(struct udev_enumerate *udev_enumerate);
struct udev *udev_enumerate_get_udev(struct udev_enumerate *udev_enumerate);
struct udev_enumerate *udev_enumerate_new(struct udev *udev);
/* device properties filter */
int udev_enumerate_add_match_subsystem(struct udev_enumerate *udev_enumerate, const char *subsystem);
int udev_enumerate_add_nomatch_subsystem(struct udev_enumerate *udev_enumerate, const char *subsystem);
int udev_enumerate_add_match_sysattr(struct udev_enumerate *udev_enumerate, const char *sysattr, const char *value);
int udev_enumerate_add_nomatch_sysattr(struct udev_enumerate *udev_enumerate, const char *sysattr, const char *value);
int udev_enumerate_add_match_property(struct udev_enumerate *udev_enumerate, const char *property, const char *value);
int udev_enumerate_add_match_sysname(struct udev_enumerate *udev_enumerate, const char *sysname);
int udev_enumerate_add_match_tag(struct udev_enumerate *udev_enumerate, const char *tag);
int udev_enumerate_add_match_parent(struct udev_enumerate *udev_enumerate, struct udev_device *parent);
int udev_enumerate_add_match_is_initialized(struct udev_enumerate *udev_enumerate);
int udev_enumerate_add_syspath(struct udev_enumerate *udev_enumerate, const char *syspath);
/* run enumeration with active filters */
int udev_enumerate_scan_devices(struct udev_enumerate *udev_enumerate);
int udev_enumerate_scan_subsystems(struct udev_enumerate *udev_enumerate);
/* return device list */
struct udev_list_entry *udev_enumerate_get_list_entry(struct udev_enumerate *udev_enumerate);

/**
 * udev_queue access to the currently running udev events
 */
struct udev_queue;
struct udev_queue *udev_queue_ref(struct udev_queue *udev_queue);
struct udev_queue *udev_queue_unref(struct udev_queue *udev_queue);
struct udev *udev_queue_get_udev(struct udev_queue *udev_queue);
struct udev_queue *udev_queue_new(struct udev *udev);
unsigned long long int udev_queue_get_kernel_seqnum(struct udev_queue *udev_queue) __attribute__((deprecated));
unsigned long long int udev_queue_get_udev_seqnum(struct udev_queue *udev_queue) __attribute__((deprecated));
int udev_queue_get_udev_is_active(struct udev_queue *udev_queue);
int udev_queue_get_queue_is_empty(struct udev_queue *udev_queue);
int udev_queue_get_seqnum_is_finished(struct udev_queue *udev_queue, unsigned long long int seqnum)
    __attribute__((deprecated));
int udev_queue_get_seqnum_sequence_is_finished(struct udev_queue *udev_queue, unsigned long long int start,
    unsigned long long int end) __attribute__((deprecated));
int udev_queue_get_fd(struct udev_queue *udev_queue);
int udev_queue_flush(struct udev_queue *udev_queue);
struct udev_list_entry *udev_queue_get_queued_list_entry(struct udev_queue *udev_queue) __attribute__((deprecated));

/**
 * udev_hwdb access to the static hardware properties database
 */
struct udev_hwdb;
struct udev_hwdb *udev_hwdb_new(struct udev *udev);
struct udev_hwdb *udev_hwdb_ref(struct udev_hwdb *hwdb);
struct udev_hwdb *udev_hwdb_unref(struct udev_hwdb *hwdb);
struct udev_list_entry *udev_hwdb_get_properties_list_entry(
    struct udev_hwdb *hwdb, const char *modalias, unsigned int flags);

/**
 * udev_util udev specific utilities
 */
int udev_util_encode_string(const char *str, char *str_enc, size_t len);

#ifdef __cplusplus
} /* extern "C" */
#endif // __cplusplus
#endif // LIBUDEV_H