mirror of
https://github.com/systemd/systemd-stable.git
synced 2024-10-30 23:21:08 +03:00
135 lines
3.5 KiB
C
135 lines
3.5 KiB
C
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <stdio.h>
|
|
#include <fcntl.h>
|
|
#include <unistd.h>
|
|
#include <errno.h>
|
|
#include <ctype.h>
|
|
|
|
#define DBUS_API_SUBJECT_TO_CHANGE
|
|
#include <dbus/dbus.h>
|
|
|
|
#include "udev.h"
|
|
#include "udev_version.h"
|
|
#include "udev_dbus.h"
|
|
|
|
|
|
/** variable for the connection the to system message bus or #NULL
|
|
* if we cannot connect or acquire the org.kernel.udev service
|
|
*/
|
|
static DBusConnection* sysbus_connection;
|
|
|
|
/** Disconnect from the system message bus */
|
|
void sysbus_disconnect(void)
|
|
{
|
|
if (sysbus_connection == NULL)
|
|
return;
|
|
|
|
dbus_connection_disconnect(sysbus_connection);
|
|
sysbus_connection = NULL;
|
|
}
|
|
|
|
/** Connect to the system message bus */
|
|
void sysbus_connect(void)
|
|
{
|
|
DBusError error;
|
|
|
|
/* Connect to a well-known bus instance, the system bus */
|
|
dbus_error_init(&error);
|
|
sysbus_connection = dbus_bus_get(DBUS_BUS_SYSTEM, &error);
|
|
if (sysbus_connection == NULL) {
|
|
dbg("cannot connect to system message bus, error %s: %s",
|
|
error.name, error.message);
|
|
dbus_error_free(&error);
|
|
return;
|
|
}
|
|
|
|
/* Acquire the org.kernel.udev service such that listeners
|
|
* know that the message is really from us and not from a
|
|
* random attacker. See the file udev_sysbus_policy.conf for
|
|
* details.
|
|
*
|
|
* Note that a service can have multiple owners (though there
|
|
* is a concept of a primary owner for reception of messages)
|
|
* so no race is introduced if two copies of udev is running
|
|
* at the same time.
|
|
*/
|
|
dbus_bus_acquire_service(sysbus_connection, "org.kernel.udev", 0,
|
|
&error);
|
|
if (dbus_error_is_set(&error)) {
|
|
printf("cannot acquire org.kernel.udev service, error %s: %s'",
|
|
error.name, error.message);
|
|
sysbus_disconnect();
|
|
return;
|
|
}
|
|
}
|
|
|
|
|
|
/** Send out a signal that a device node is created
|
|
*
|
|
* @param dev udevice object
|
|
* @param path Sysfs path of device
|
|
*/
|
|
void sysbus_send_create(struct udevice *dev, const char *path)
|
|
{
|
|
char filename[255];
|
|
DBusMessage* message;
|
|
DBusMessageIter iter;
|
|
|
|
if (sysbus_connection == NULL)
|
|
return;
|
|
|
|
strncpy(filename, udev_root, sizeof(filename));
|
|
strncat(filename, dev->name, sizeof(filename));
|
|
|
|
/* object, interface, member */
|
|
message = dbus_message_new_signal("/org/kernel/udev/NodeMonitor",
|
|
"org.kernel.udev.NodeMonitor",
|
|
"NodeCreated");
|
|
|
|
dbus_message_iter_init(message, &iter);
|
|
dbus_message_iter_append_string(&iter, filename);
|
|
dbus_message_iter_append_string(&iter, path);
|
|
|
|
if ( !dbus_connection_send(sysbus_connection, message, NULL) )
|
|
dbg("error sending d-bus signal");
|
|
|
|
dbus_message_unref(message);
|
|
|
|
dbus_connection_flush(sysbus_connection);
|
|
}
|
|
|
|
/** Send out a signal that a device node is deleted
|
|
*
|
|
* @param name Name of the device node, e.g. /udev/sda1
|
|
* @param path Sysfs path of device
|
|
*/
|
|
void sysbus_send_remove(const char* name, const char *path)
|
|
{
|
|
char filename[255];
|
|
DBusMessage* message;
|
|
DBusMessageIter iter;
|
|
|
|
if (sysbus_connection == NULL)
|
|
return;
|
|
|
|
strncpy(filename, udev_root, sizeof(filename));
|
|
strncat(filename, name, sizeof(filename));
|
|
|
|
/* object, interface, member */
|
|
message = dbus_message_new_signal("/org/kernel/udev/NodeMonitor",
|
|
"org.kernel.udev.NodeMonitor",
|
|
"NodeDeleted");
|
|
|
|
dbus_message_iter_init(message, &iter);
|
|
dbus_message_iter_append_string(&iter, filename);
|
|
dbus_message_iter_append_string(&iter, path);
|
|
|
|
if ( !dbus_connection_send(sysbus_connection, message, NULL) )
|
|
dbg("error sending d-bus signal");
|
|
|
|
dbus_message_unref(message);
|
|
|
|
dbus_connection_flush(sysbus_connection);
|
|
}
|