mirror of
https://github.com/AuxXxilium/eudev.git
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257 lines
7.0 KiB
C
257 lines
7.0 KiB
C
/*
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* libudev - interface to udev device information
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*
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* Copyright (C) 2008 Kay Sievers <kay.sievers@vrfy.org>
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "config.h"
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#include <stdio.h>
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#include <stdlib.h>
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#include <stddef.h>
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#include <unistd.h>
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#include <errno.h>
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#include <string.h>
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#include <dirent.h>
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#include <sys/stat.h>
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#include "libudev.h"
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#include "libudev-private.h"
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#include "../udev.h"
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static struct udev_device *device_init(struct udev *udev)
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{
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struct udev_device *udev_device;
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udev_device = malloc(sizeof(struct udev_device));
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if (udev_device == NULL)
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return NULL;
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memset(udev_device, 0x00, sizeof(struct udev_device));
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udev_device->refcount = 1;
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udev_device->udev = udev;
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return udev_device;
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}
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/**
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* udev_device_new_from_devpath:
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* @udev: udev library context
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* @devpath: sys device path
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*
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* Create new udev device, and fill in information from the sysfs
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* device and the udev database entry. The devpath must not contain
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* the sysfs mount path, and must contain a leading '/'.
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*
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* The initial refcount is 1, and needs to be decremented to
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* release the ressources of the udev device.
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*
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* Returns: a new udev device, or #NULL, if it does not exist
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**/
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struct udev_device *udev_device_new_from_devpath(struct udev *udev, const char *devpath)
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{
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char path[PATH_SIZE];
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struct stat statbuf;
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struct udev_device *udev_device;
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int err;
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strlcpy(path, udev_get_sys_path(udev), sizeof(path));
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strlcat(path, devpath, sizeof(path));
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if (stat(path, &statbuf) != 0)
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return NULL;
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if (!S_ISDIR(statbuf.st_mode))
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return NULL;
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udev_device = device_init(udev);
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if (udev_device == NULL)
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return NULL;
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udev_device->udevice = udev_device_init(NULL);
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if (udev_device->udevice == NULL) {
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free(udev_device);
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return NULL;
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}
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log_info(udev, "device %p created\n", udev_device);
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strlcpy(path, devpath, sizeof(path));
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sysfs_resolve_link(path, sizeof(path));
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err = udev_db_get_device(udev_device->udevice, path);
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if (err >= 0)
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log_info(udev, "device %p filled with udev database data\n", udev_device);
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log_info(udev, "device %p filled with %s data\n", udev_device, udev_device_get_devpath(udev_device));
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return udev_device;
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}
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/**
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* udev_device_get_udev:
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*
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* Retrieve the udev library context the device was created with.
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*
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* Returns: the udev library context
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**/
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struct udev *udev_device_get_udev(struct udev_device *udev_device)
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{
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return udev_device->udev;
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}
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/**
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* udev_device_ref:
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* @udev_device: udev device
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*
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* Take a reference of a udev device.
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*
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* Returns: the passed udev device
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**/
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struct udev_device *udev_device_ref(struct udev_device *udev_device)
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{
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udev_device->refcount++;
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return udev_device;
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}
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/**
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* udev_device_unref:
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* @udev_device: udev device
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*
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* Drop a reference of a udev device. If the refcount reaches zero,
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* the ressources of the device will be released.
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*
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**/
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void udev_device_unref(struct udev_device *udev_device)
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{
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udev_device->refcount--;
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if (udev_device->refcount > 0)
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return;
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udev_device_cleanup(udev_device->udevice);
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free(udev_device);
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}
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/**
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* udev_device_get_devpath:
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* @udev_device: udev device
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*
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* Retrieve the sys path of the udev device. The path does not contain
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* the sys mount point.
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*
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* Returns: the sys path of the udev device
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**/
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const char *udev_device_get_devpath(struct udev_device *udev_device)
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{
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return udev_device->udevice->dev->devpath;
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}
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/**
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* udev_device_get_devname:
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* @udev_device: udev device
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*
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* Retrieve the device node file name belonging to the udev device.
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* The path does not contain the device directory, and does not contain
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* a leading '/'.
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*
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* Returns: the device node file name of the udev device, or #NULL if no device node exists
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**/
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const char *udev_device_get_devname(struct udev_device *udev_device)
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{
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if (udev_device->udevice->name[0] == '\0')
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return NULL;
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return udev_device->udevice->name;
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}
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/**
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* udev_device_get_subsystem:
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* @udev_device: udev device
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*
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* Retrieve the subsystem string of the udev device. The string does not
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* contain any "/".
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*
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* Returns: the subsystem name of the udev device, or #NULL if it can not be determined
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**/
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const char *udev_device_get_subsystem(struct udev_device *udev_device)
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{
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struct sysfs_device *dev = udev_device->udevice->dev;
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if (dev->subsystem[0] != '\0')
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return dev->subsystem;
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if (util_get_sys_subsystem(udev_device->udev, dev->devpath,
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dev->subsystem, sizeof(dev->subsystem)) < 2)
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return NULL;
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return dev->subsystem;
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}
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/**
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* udev_device_get_devlinks:
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* @udev_device: udev device
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* @cb: function to be called for every device link found
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* @data: data to be passed to the function
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*
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* Retrieve the device links pointing to the device file of the
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* udev device. For every device link, the passed function will be
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* called with the device link string. If the function returns 1,
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* remaning device links will be ignored. The device link path
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* does not contain the device directory, and does not contain
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* a leading '/'.
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*
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* Returns: the number of device links passed to the caller, or a negative value on error
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**/
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int udev_device_get_devlinks(struct udev_device *udev_device,
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int (*cb)(struct udev_device *udev_device, const char *value, void *data),
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void *data)
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{
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struct name_entry *name_loop;
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int count = 0;
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list_for_each_entry(name_loop, &udev_device->udevice->symlink_list, node) {
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count++;
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if (cb(udev_device, name_loop->name, data) != 0)
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break;
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}
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return count;
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}
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/**
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* udev_device_get_properties:
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* @udev_device: udev device
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* @cb: function to be called for every property found
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* @data: data to be passed to the function
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*
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* Retrieve the property key/value pairs belonging to the
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* udev device. For every key/value pair, the passed function will be
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* called. If the function returns 1, remaning properties will be
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* ignored.
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*
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* Returns: the number of properties passed to the caller, or a negative value on error
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**/
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int udev_device_get_properties(struct udev_device *udev_device,
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int (*cb)(struct udev_device *udev_device, const char *key, const char *value, void *data),
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void *data)
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{
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struct name_entry *name_loop;
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int count = 0;
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list_for_each_entry(name_loop, &udev_device->udevice->env_list, node) {
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char name[PATH_SIZE];
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char *val;
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strncpy(name, name_loop->name, PATH_SIZE);
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name[PATH_SIZE-1] = '\0';
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val = strchr(name, '=');
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if (val == NULL)
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continue;
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val[0] = '\0';
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val = &val[1];
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if (cb(udev_device, name, val, data) != 0)
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break;
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}
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return count;
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}
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