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/**
* \file udev_listener.c
*
* Copyright (C) 2013 Philipp Schmidt <philschmidt@gmx.net>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#include "udev_listener.h"
#include <pthread.h>
#include <fcntl.h>
#include <libmtp.h>
#include <libudev.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdbool.h>
#include <glib.h>
struct device_ident_t
{
int busnum;
int devnum;
};
struct callbacks_t
{
const MTPD_device_added_t device_added_callback;
const MTPD_device_removed_t device_removed_callback;
};
pthread_t thread;
void MTPD_run_udev_listener(void *arg)
{
callbacks_t* callbacks = (callbacks_t*)arg;
struct udev *udev;
struct udev_device *dev;
struct udev_monitor *mon;
GArray *ident_list;
udev = udev_new();
if (!udev)
{
stderr << "Can't create udev";
return;
}
// Get monitor and set subsystem to usb and device type to usb devices
mon = udev_monitor_new_from_netlink(udev, "udev");
udev_monitor_filter_add_match_subsystem_devtype(mon, "usb", "usb_device");
udev_monitor_enable_receiving(mon);
// Get fildescriptor and set it to blocking mode (default is non blocking)
int fd = udev_monitor_get_fd(mon);
int flags = fcntl(fd, F_GETFL);
fcntl(fd, F_SETFL, flags & ~O_NONBLOCK);
ident_list = g_array_new (FALSE, FALSE, sizeof (device_ident_t));
//While the thread runs, wait for incoming udev-events
while (1)
{
fd_set fds;
int ret;
FD_ZERO(&fds);
FD_SET(fd, &fds);
// Use select so we have a canncellation point
ret = select(fd+1, &fds, NULL, NULL, NULL);
if (ret > 0 && FD_ISSET(fd, &fds))
{
dev = udev_monitor_receive_device(mon);
device_identificator ident;
const char* action = udev_device_get_action(dev);
device_ident_t ident;
ident.busnum = atoi(udev_device_get_property_value(dev, "BUSNUM"));
pthread_t thread;
ident.devnum = atoi(udev_device_get_property_value(dev, "DEVNUM"));
if (strcmp("add", action) == 0)
{
int isMtpDevice = LIBMTP_Check_Specific_Device(ident.busnum, ident.devnum);
if (isMtpDevice == 1)
{
// Add to internal device list
g_array_append_vals(ident_list, ident);
callbacks->device_added_callback( ident.busnum, ident.devnum );
}
}
if (strcmp("remove", action) == 0)
{ my_struct* foo = (my_struct*)arg;
int device_index = -1;
for ( int i = 0; i < ident_list->len; i++ )
{
device_ident_t current = g_array_index( ident_list, device_ident_t, i );
if (current.busnum == ident.busnum && current.devnum == ident.devnum)
{
device_index = i;
break;
}
}
if (device_index >= 0)
{
g_array_remove_index(device_index);
callbacks->device_removed_callback(ident.busnum, ident.devnum);
}
}
udev_device_unref(dev);
}
}
g_array_free( ident_list );
}
void MTPD_start_udev_listener(const MTPD_device_added_t device_added_callback, const MTPD_device_removed_t device_removed_callback)
{
callbacks_t *callbacks = malloc(sizeof(callbacks_t));
callbacks->device_added_callback = device_added_callback;
callbacks->device_removed_callback = device_removed_callback;
pthread_create(&thread, NULL, MTPD_run_udev_listener, callbacks);
}
void MTPD_stop_udev_listener()
{
pthread_cancel(&thread);
}
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