+++ /dev/null
-/* -*- Mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*-
- *
- * Copyright (C) 2008-2010 David Zeuthen <davidz@redhat.com>
- *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Library General Public
- * License as published by the Free Software Foundation; either
- * version 2 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * Library General Public License for more details.
- *
- * You should have received a copy of the GNU Library General Public
- * License along with this library; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
- */
-
-#ifdef HAVE_CONFIG_H
-# include "config.h"
-#endif
-
-#include <stdlib.h>
-#include <string.h>
-#include <sys/stat.h>
-
-#include "gudevclient.h"
-#include "gudevdevice.h"
-#include "gudevmarshal.h"
-#include "gudevprivate.h"
-
-/**
- * SECTION:gudevclient
- * @short_description: Query devices and listen to uevents
- *
- * #GUdevClient is used to query information about devices on a Linux
- * system from the Linux kernel and the udev device
- * manager.
- *
- * Device information is retrieved from the kernel (through the
- * <literal>sysfs</literal> filesystem) and the udev daemon (through a
- * <literal>tmpfs</literal> filesystem) and presented through
- * #GUdevDevice objects. This means that no blocking IO ever happens
- * (in both cases, we are essentially just reading data from kernel
- * memory) and as such there are no asynchronous versions of the
- * provided methods.
- *
- * To get #GUdevDevice objects, use
- * g_udev_client_query_by_subsystem(),
- * g_udev_client_query_by_device_number(),
- * g_udev_client_query_by_device_file(),
- * g_udev_client_query_by_sysfs_path(),
- * g_udev_client_query_by_subsystem_and_name()
- * or the #GUdevEnumerator type.
- *
- * To listen to uevents, connect to the #GUdevClient::uevent signal.
- */
-
-struct _GUdevClientPrivate
-{
- GSource *watch_source;
- struct udev *udev;
- struct udev_monitor *monitor;
-
- gchar **subsystems;
-};
-
-enum
-{
- PROP_0,
- PROP_SUBSYSTEMS,
-};
-
-enum
-{
- UEVENT_SIGNAL,
- LAST_SIGNAL,
-};
-
-static guint signals[LAST_SIGNAL] = { 0 };
-
-G_DEFINE_TYPE (GUdevClient, g_udev_client, G_TYPE_OBJECT)
-
-/* ---------------------------------------------------------------------------------------------------- */
-
-static gboolean
-monitor_event (GIOChannel *source,
- GIOCondition condition,
- gpointer data)
-{
- GUdevClient *client = (GUdevClient *) data;
- GUdevDevice *device;
- struct udev_device *udevice;
-
- if (client->priv->monitor == NULL)
- goto out;
- udevice = udev_monitor_receive_device (client->priv->monitor);
- if (udevice == NULL)
- goto out;
-
- device = _g_udev_device_new (udevice);
- udev_device_unref (udevice);
- g_signal_emit (client,
- signals[UEVENT_SIGNAL],
- 0,
- g_udev_device_get_action (device),
- device);
- g_object_unref (device);
-
- out:
- return TRUE;
-}
-
-static void
-g_udev_client_finalize (GObject *object)
-{
- GUdevClient *client = G_UDEV_CLIENT (object);
-
- if (client->priv->watch_source != NULL)
- {
- g_source_destroy (client->priv->watch_source);
- client->priv->watch_source = NULL;
- }
-
- if (client->priv->monitor != NULL)
- {
- udev_monitor_unref (client->priv->monitor);
- client->priv->monitor = NULL;
- }
-
- if (client->priv->udev != NULL)
- {
- udev_unref (client->priv->udev);
- client->priv->udev = NULL;
- }
-
- g_strfreev (client->priv->subsystems);
-
- if (G_OBJECT_CLASS (g_udev_client_parent_class)->finalize != NULL)
- G_OBJECT_CLASS (g_udev_client_parent_class)->finalize (object);
-}
-
-static void
-g_udev_client_set_property (GObject *object,
- guint prop_id,
- const GValue *value,
- GParamSpec *pspec)
-{
- GUdevClient *client = G_UDEV_CLIENT (object);
-
- switch (prop_id)
- {
- case PROP_SUBSYSTEMS:
- if (client->priv->subsystems != NULL)
- g_strfreev (client->priv->subsystems);
- client->priv->subsystems = g_strdupv (g_value_get_boxed (value));
- break;
-
- default:
- G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
- break;
- }
-}
-
-static void
-g_udev_client_get_property (GObject *object,
- guint prop_id,
- GValue *value,
- GParamSpec *pspec)
-{
- GUdevClient *client = G_UDEV_CLIENT (object);
-
- switch (prop_id)
- {
- case PROP_SUBSYSTEMS:
- g_value_set_boxed (value, client->priv->subsystems);
- break;
-
- default:
- G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
- break;
- }
-}
-
-static void
-g_udev_client_constructed (GObject *object)
-{
- GUdevClient *client = G_UDEV_CLIENT (object);
- GIOChannel *channel;
- guint n;
-
- client->priv->udev = udev_new ();
-
- /* connect to event source */
- client->priv->monitor = udev_monitor_new_from_netlink (client->priv->udev, "udev");
-
- //g_debug ("ss = %p", client->priv->subsystems);
-
- if (client->priv->subsystems != NULL)
- {
- /* install subsystem filters to only wake up for certain events */
- for (n = 0; client->priv->subsystems[n] != NULL; n++)
- {
- gchar *subsystem;
- gchar *devtype;
- gchar *s;
-
- subsystem = g_strdup (client->priv->subsystems[n]);
- devtype = NULL;
-
- //g_debug ("s = '%s'", subsystem);
-
- s = strstr (subsystem, "/");
- if (s != NULL)
- {
- devtype = s + 1;
- *s = '\0';
- }
-
- if (client->priv->monitor != NULL)
- udev_monitor_filter_add_match_subsystem_devtype (client->priv->monitor, subsystem, devtype);
-
- g_free (subsystem);
- }
-
- /* listen to events, and buffer them */
- if (client->priv->monitor != NULL)
- {
- udev_monitor_enable_receiving (client->priv->monitor);
- channel = g_io_channel_unix_new (udev_monitor_get_fd (client->priv->monitor));
- client->priv->watch_source = g_io_create_watch (channel, G_IO_IN);
- g_io_channel_unref (channel);
- g_source_set_callback (client->priv->watch_source, (GSourceFunc) monitor_event, client, NULL);
- g_source_attach (client->priv->watch_source, g_main_context_get_thread_default ());
- g_source_unref (client->priv->watch_source);
- }
- else
- {
- client->priv->watch_source = NULL;
- }
- }
-
- if (G_OBJECT_CLASS (g_udev_client_parent_class)->constructed != NULL)
- G_OBJECT_CLASS (g_udev_client_parent_class)->constructed (object);
-}
-
-
-static void
-g_udev_client_class_init (GUdevClientClass *klass)
-{
- GObjectClass *gobject_class = (GObjectClass *) klass;
-
- gobject_class->constructed = g_udev_client_constructed;
- gobject_class->set_property = g_udev_client_set_property;
- gobject_class->get_property = g_udev_client_get_property;
- gobject_class->finalize = g_udev_client_finalize;
-
- /**
- * GUdevClient:subsystems:
- *
- * The subsystems to listen for uevents on.
- *
- * To listen for only a specific DEVTYPE for a given SUBSYSTEM, use
- * "subsystem/devtype". For example, to only listen for uevents
- * where SUBSYSTEM is usb and DEVTYPE is usb_interface, use
- * "usb/usb_interface".
- *
- * If this property is %NULL, then no events will be reported. If
- * it's the empty array, events from all subsystems will be
- * reported.
- */
- g_object_class_install_property (gobject_class,
- PROP_SUBSYSTEMS,
- g_param_spec_boxed ("subsystems",
- "The subsystems to listen for changes on",
- "The subsystems to listen for changes on",
- G_TYPE_STRV,
- G_PARAM_CONSTRUCT_ONLY |
- G_PARAM_READWRITE));
-
- /**
- * GUdevClient::uevent:
- * @client: The #GUdevClient receiving the event.
- * @action: The action for the uevent e.g. "add", "remove", "change", "move", etc.
- * @device: Details about the #GUdevDevice the event is for.
- *
- * Emitted when @client receives an uevent.
- *
- * This signal is emitted in the
- * <link linkend="g-main-context-push-thread-default">thread-default main loop</link>
- * of the thread that @client was created in.
- */
- signals[UEVENT_SIGNAL] = g_signal_new ("uevent",
- G_TYPE_FROM_CLASS (klass),
- G_SIGNAL_RUN_LAST,
- G_STRUCT_OFFSET (GUdevClientClass, uevent),
- NULL,
- NULL,
- g_udev_marshal_VOID__STRING_OBJECT,
- G_TYPE_NONE,
- 2,
- G_TYPE_STRING,
- G_UDEV_TYPE_DEVICE);
-
- g_type_class_add_private (klass, sizeof (GUdevClientPrivate));
-}
-
-static void
-g_udev_client_init (GUdevClient *client)
-{
- client->priv = G_TYPE_INSTANCE_GET_PRIVATE (client,
- G_UDEV_TYPE_CLIENT,
- GUdevClientPrivate);
-}
-
-/**
- * g_udev_client_new:
- * @subsystems: (array zero-terminated=1) (element-type utf8) (transfer none) (allow-none): A %NULL terminated string array of subsystems to listen for uevents on, %NULL to not listen on uevents at all, or an empty array to listen to uevents on all subsystems. See the documentation for the #GUdevClient:subsystems property for details on this parameter.
- *
- * Constructs a #GUdevClient object that can be used to query
- * information about devices. Connect to the #GUdevClient::uevent
- * signal to listen for uevents. Note that signals are emitted in the
- * <link linkend="g-main-context-push-thread-default">thread-default main loop</link>
- * of the thread that you call this constructor from.
- *
- * Returns: A new #GUdevClient object. Free with g_object_unref().
- */
-GUdevClient *
-g_udev_client_new (const gchar * const *subsystems)
-{
- return G_UDEV_CLIENT (g_object_new (G_UDEV_TYPE_CLIENT, "subsystems", subsystems, NULL));
-}
-
-/**
- * g_udev_client_query_by_subsystem:
- * @client: A #GUdevClient.
- * @subsystem: (allow-none): The subsystem to get devices for or %NULL to get all devices.
- *
- * Gets all devices belonging to @subsystem.
- *
- * Returns: (nullable) (element-type GUdevDevice) (transfer full): A
- * list of #GUdevDevice objects. The caller should free the result by
- * using g_object_unref() on each element in the list and then
- * g_list_free() on the list.
- */
-GList *
-g_udev_client_query_by_subsystem (GUdevClient *client,
- const gchar *subsystem)
-{
- struct udev_enumerate *enumerate;
- struct udev_list_entry *l, *devices;
- GList *ret;
-
- g_return_val_if_fail (G_UDEV_IS_CLIENT (client), NULL);
-
- ret = NULL;
-
- /* prepare a device scan */
- enumerate = udev_enumerate_new (client->priv->udev);
-
- /* filter for subsystem */
- if (subsystem != NULL)
- udev_enumerate_add_match_subsystem (enumerate, subsystem);
- /* retrieve the list */
- udev_enumerate_scan_devices (enumerate);
-
- /* add devices to the list */
- devices = udev_enumerate_get_list_entry (enumerate);
- for (l = devices; l != NULL; l = udev_list_entry_get_next (l))
- {
- struct udev_device *udevice;
- GUdevDevice *device;
-
- udevice = udev_device_new_from_syspath (udev_enumerate_get_udev (enumerate),
- udev_list_entry_get_name (l));
- if (udevice == NULL)
- continue;
- device = _g_udev_device_new (udevice);
- udev_device_unref (udevice);
- ret = g_list_prepend (ret, device);
- }
- udev_enumerate_unref (enumerate);
-
- ret = g_list_reverse (ret);
-
- return ret;
-}
-
-/**
- * g_udev_client_query_by_device_number:
- * @client: A #GUdevClient.
- * @type: A value from the #GUdevDeviceType enumeration.
- * @number: A device number.
- *
- * Looks up a device for a type and device number.
- *
- * Returns: (nullable) (transfer full): A #GUdevDevice object or %NULL
- * if the device was not found. Free with g_object_unref().
- */
-GUdevDevice *
-g_udev_client_query_by_device_number (GUdevClient *client,
- GUdevDeviceType type,
- GUdevDeviceNumber number)
-{
- struct udev_device *udevice;
- GUdevDevice *device;
-
- g_return_val_if_fail (G_UDEV_IS_CLIENT (client), NULL);
-
- device = NULL;
- udevice = udev_device_new_from_devnum (client->priv->udev, type, number);
-
- if (udevice == NULL)
- goto out;
-
- device = _g_udev_device_new (udevice);
- udev_device_unref (udevice);
-
- out:
- return device;
-}
-
-/**
- * g_udev_client_query_by_device_file:
- * @client: A #GUdevClient.
- * @device_file: A device file.
- *
- * Looks up a device for a device file.
- *
- * Returns: (nullable) (transfer full): A #GUdevDevice object or %NULL
- * if the device was not found. Free with g_object_unref().
- */
-GUdevDevice *
-g_udev_client_query_by_device_file (GUdevClient *client,
- const gchar *device_file)
-{
- struct stat stat_buf;
- GUdevDevice *device;
-
- g_return_val_if_fail (G_UDEV_IS_CLIENT (client), NULL);
- g_return_val_if_fail (device_file != NULL, NULL);
-
- device = NULL;
-
- if (stat (device_file, &stat_buf) != 0)
- goto out;
-
- if (stat_buf.st_rdev == 0)
- goto out;
-
- if (S_ISBLK (stat_buf.st_mode))
- device = g_udev_client_query_by_device_number (client, G_UDEV_DEVICE_TYPE_BLOCK, stat_buf.st_rdev);
- else if (S_ISCHR (stat_buf.st_mode))
- device = g_udev_client_query_by_device_number (client, G_UDEV_DEVICE_TYPE_CHAR, stat_buf.st_rdev);
-
- out:
- return device;
-}
-
-/**
- * g_udev_client_query_by_sysfs_path:
- * @client: A #GUdevClient.
- * @sysfs_path: A sysfs path.
- *
- * Looks up a device for a sysfs path.
- *
- * Returns: (nullable) (transfer full): A #GUdevDevice object or %NULL
- * if the device was not found. Free with g_object_unref().
- */
-GUdevDevice *
-g_udev_client_query_by_sysfs_path (GUdevClient *client,
- const gchar *sysfs_path)
-{
- struct udev_device *udevice;
- GUdevDevice *device;
-
- g_return_val_if_fail (G_UDEV_IS_CLIENT (client), NULL);
- g_return_val_if_fail (sysfs_path != NULL, NULL);
-
- device = NULL;
- udevice = udev_device_new_from_syspath (client->priv->udev, sysfs_path);
- if (udevice == NULL)
- goto out;
-
- device = _g_udev_device_new (udevice);
- udev_device_unref (udevice);
-
- out:
- return device;
-}
-
-/**
- * g_udev_client_query_by_subsystem_and_name:
- * @client: A #GUdevClient.
- * @subsystem: A subsystem name.
- * @name: The name of the device.
- *
- * Looks up a device for a subsystem and name.
- *
- * Returns: (nullable) (transfer full): A #GUdevDevice object or %NULL
- * if the device was not found. Free with g_object_unref().
- */
-GUdevDevice *
-g_udev_client_query_by_subsystem_and_name (GUdevClient *client,
- const gchar *subsystem,
- const gchar *name)
-{
- struct udev_device *udevice;
- GUdevDevice *device;
-
- g_return_val_if_fail (G_UDEV_IS_CLIENT (client), NULL);
- g_return_val_if_fail (subsystem != NULL, NULL);
- g_return_val_if_fail (name != NULL, NULL);
-
- device = NULL;
- udevice = udev_device_new_from_subsystem_sysname (client->priv->udev, subsystem, name);
- if (udevice == NULL)
- goto out;
-
- device = _g_udev_device_new (udevice);
- udev_device_unref (udevice);
-
- out:
- return device;
-}
-
-struct udev *
-_g_udev_client_get_udev (GUdevClient *client)
-{
- g_return_val_if_fail (G_UDEV_IS_CLIENT (client), NULL);
- return client->priv->udev;
-}
~ianmdlvl / elogind.git / blobdiff