+++ /dev/null
-/* -*- Mode: C; c-basic-offset:8 ; indent-tabs-mode:t -*- */
-/*
- * Linux usbfs backend for libusb
- * Copyright (C) 2007-2009 Daniel Drake <dsd@gentoo.org>
- * Copyright (c) 2001 Johannes Erdfelt <johannes@erdfelt.com>
- * Copyright (c) 2012-2013 Nathan Hjelm <hjelmn@mac.com>
- *
- * 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 2.1 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
- */
-
-#include "config.h"
-
-#include <assert.h>
-#include <ctype.h>
-#include <dirent.h>
-#include <errno.h>
-#include <fcntl.h>
-#include <poll.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <sys/ioctl.h>
-#include <sys/stat.h>
-#include <sys/types.h>
-#include <sys/utsname.h>
-#include <sys/socket.h>
-#include <unistd.h>
-#include <libudev.h>
-
-#include "libusb.h"
-#include "libusbi.h"
-#include "linux_usbfs.h"
-
-/* udev context */
-static struct udev *udev_ctx = NULL;
-static int udev_monitor_fd = -1;
-static int udev_control_pipe[2] = {-1, -1};
-static struct udev_monitor *udev_monitor = NULL;
-static pthread_t linux_event_thread;
-
-static void udev_hotplug_event(struct udev_device* udev_dev);
-static void *linux_udev_event_thread_main(void *arg);
-
-int linux_udev_start_event_monitor(void)
-{
- int r;
-
- assert(udev_ctx == NULL);
- udev_ctx = udev_new();
- if (!udev_ctx) {
- usbi_err(NULL, "could not create udev context");
- return LIBUSB_ERROR_OTHER;
- }
-
- udev_monitor = udev_monitor_new_from_netlink(udev_ctx, "udev");
- if (!udev_monitor) {
- usbi_err(NULL, "could not initialize udev monitor");
- goto err_free_ctx;
- }
-
- r = udev_monitor_filter_add_match_subsystem_devtype(udev_monitor, "usb", 0);
- if (r) {
- usbi_err(NULL, "could not initialize udev monitor filter for \"usb\" subsystem");
- goto err_free_monitor;
- }
-
- if (udev_monitor_enable_receiving(udev_monitor)) {
- usbi_err(NULL, "failed to enable the udev monitor");
- goto err_free_monitor;
- }
-
- udev_monitor_fd = udev_monitor_get_fd(udev_monitor);
-
- /* Some older versions of udev are not non-blocking by default,
- * so make sure this is set */
- r = fcntl(udev_monitor_fd, F_GETFL);
- if (r == -1) {
- usbi_err(NULL, "getting udev monitor fd flags (%d)", errno);
- goto err_free_monitor;
- }
- r = fcntl(udev_monitor_fd, F_SETFL, r | O_NONBLOCK);
- if (r) {
- usbi_err(NULL, "setting udev monitor fd flags (%d)", errno);
- goto err_free_monitor;
- }
-
- r = usbi_pipe(udev_control_pipe);
- if (r) {
- usbi_err(NULL, "could not create udev control pipe");
- goto err_free_monitor;
- }
-
- r = pthread_create(&linux_event_thread, NULL, linux_udev_event_thread_main, NULL);
- if (r) {
- usbi_err(NULL, "creating hotplug event thread (%d)", r);
- goto err_close_pipe;
- }
-
- return LIBUSB_SUCCESS;
-
-err_close_pipe:
- close(udev_control_pipe[0]);
- close(udev_control_pipe[1]);
-err_free_monitor:
- udev_monitor_unref(udev_monitor);
- udev_monitor = NULL;
- udev_monitor_fd = -1;
-err_free_ctx:
- udev_unref(udev_ctx);
- udev_ctx = NULL;
- return LIBUSB_ERROR_OTHER;
-}
-
-int linux_udev_stop_event_monitor(void)
-{
- char dummy = 1;
- int r;
-
- assert(udev_ctx != NULL);
- assert(udev_monitor != NULL);
- assert(udev_monitor_fd != -1);
-
- /* Write some dummy data to the control pipe and
- * wait for the thread to exit */
- r = usbi_write(udev_control_pipe[1], &dummy, sizeof(dummy));
- if (r <= 0) {
- usbi_warn(NULL, "udev control pipe signal failed");
- }
- pthread_join(linux_event_thread, NULL);
-
- /* Release the udev monitor */
- udev_monitor_unref(udev_monitor);
- udev_monitor = NULL;
- udev_monitor_fd = -1;
-
- /* Clean up the udev context */
- udev_unref(udev_ctx);
- udev_ctx = NULL;
-
- /* close and reset control pipe */
- close(udev_control_pipe[0]);
- close(udev_control_pipe[1]);
- udev_control_pipe[0] = -1;
- udev_control_pipe[1] = -1;
-
- return LIBUSB_SUCCESS;
-}
-
-static void *linux_udev_event_thread_main(void *arg)
-{
- char dummy;
- int r;
- struct udev_device* udev_dev;
- struct pollfd fds[] = {
- {.fd = udev_control_pipe[0],
- .events = POLLIN},
- {.fd = udev_monitor_fd,
- .events = POLLIN},
- };
-
- usbi_dbg("udev event thread entering.");
-
- while (poll(fds, 2, -1) >= 0) {
- if (fds[0].revents & POLLIN) {
- /* activity on control pipe, read the byte and exit */
- r = usbi_read(udev_control_pipe[0], &dummy, sizeof(dummy));
- if (r <= 0) {
- usbi_warn(NULL, "udev control pipe read failed");
- }
- break;
- }
- if (fds[1].revents & POLLIN) {
- usbi_mutex_static_lock(&linux_hotplug_lock);
- udev_dev = udev_monitor_receive_device(udev_monitor);
- if (udev_dev)
- udev_hotplug_event(udev_dev);
- usbi_mutex_static_unlock(&linux_hotplug_lock);
- }
- }
-
- usbi_dbg("udev event thread exiting");
-
- return NULL;
-}
-
-static int udev_device_info(struct libusb_context *ctx, int detached,
- struct udev_device *udev_dev, uint8_t *busnum,
- uint8_t *devaddr, const char **sys_name) {
- const char *dev_node;
-
- dev_node = udev_device_get_devnode(udev_dev);
- if (!dev_node) {
- return LIBUSB_ERROR_OTHER;
- }
-
- *sys_name = udev_device_get_sysname(udev_dev);
- if (!*sys_name) {
- return LIBUSB_ERROR_OTHER;
- }
-
- return linux_get_device_address(ctx, detached, busnum, devaddr,
- dev_node, *sys_name);
-}
-
-static void udev_hotplug_event(struct udev_device* udev_dev)
-{
- const char* udev_action;
- const char* sys_name = NULL;
- uint8_t busnum = 0, devaddr = 0;
- int detached;
- int r;
-
- do {
- udev_action = udev_device_get_action(udev_dev);
- if (!udev_action) {
- break;
- }
-
- detached = !strncmp(udev_action, "remove", 6);
-
- r = udev_device_info(NULL, detached, udev_dev, &busnum, &devaddr, &sys_name);
- if (LIBUSB_SUCCESS != r) {
- break;
- }
-
- usbi_dbg("udev hotplug event. action: %s.", udev_action);
-
- if (strncmp(udev_action, "add", 3) == 0) {
- linux_hotplug_enumerate(busnum, devaddr, sys_name);
- } else if (detached) {
- linux_device_disconnected(busnum, devaddr, sys_name);
- } else {
- usbi_err(NULL, "ignoring udev action %s", udev_action);
- }
- } while (0);
-
- udev_device_unref(udev_dev);
-}
-
-int linux_udev_scan_devices(struct libusb_context *ctx)
-{
- struct udev_enumerate *enumerator;
- struct udev_list_entry *devices, *entry;
- struct udev_device *udev_dev;
- const char *sys_name;
- int r;
-
- assert(udev_ctx != NULL);
-
- enumerator = udev_enumerate_new(udev_ctx);
- if (NULL == enumerator) {
- usbi_err(ctx, "error creating udev enumerator");
- return LIBUSB_ERROR_OTHER;
- }
-
- udev_enumerate_add_match_subsystem(enumerator, "usb");
- udev_enumerate_scan_devices(enumerator);
- devices = udev_enumerate_get_list_entry(enumerator);
-
- udev_list_entry_foreach(entry, devices) {
- const char *path = udev_list_entry_get_name(entry);
- uint8_t busnum = 0, devaddr = 0;
-
- udev_dev = udev_device_new_from_syspath(udev_ctx, path);
-
- r = udev_device_info(ctx, 0, udev_dev, &busnum, &devaddr, &sys_name);
- if (r) {
- udev_device_unref(udev_dev);
- continue;
- }
-
- linux_enumerate_device(ctx, busnum, devaddr, sys_name);
- udev_device_unref(udev_dev);
- }
-
- udev_enumerate_unref(enumerator);
-
- return LIBUSB_SUCCESS;
-}
-
-void linux_udev_hotplug_poll(void)
-{
- struct udev_device* udev_dev;
-
- usbi_mutex_static_lock(&linux_hotplug_lock);
- do {
- udev_dev = udev_monitor_receive_device(udev_monitor);
- if (udev_dev) {
- usbi_dbg("Handling hotplug event from hotplug_poll");
- udev_hotplug_event(udev_dev);
- }
- } while (udev_dev);
- usbi_mutex_static_unlock(&linux_hotplug_lock);
-}
projects / rtmpclient.git / blobdiff