thodg/cgminer/compat/libusb-1.0/libusb/os/linux_udev.c

• Show log

  Commit

• Hash : 7ffb1614
  Author :
  Date : 2014-02-06T09:52:46
  

  Revert "Update to libusb-1.0.18" This reverts commit f7a78eb8b62d79725ee73db1c1e3992f07d490f6. The alleged libusbx merge with libusb does not confer the stability of the older libusb code.

Download

• compat/libusb-1.0/libusb/os/linux_udev.c

• /* -*- 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 <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 struct udev_monitor *udev_monitor = NULL;
  static pthread_t linux_event_thread;
  
  static void udev_hotplug_event(void);
  static void *linux_udev_event_thread_main(void *arg);
  
  int linux_udev_start_event_monitor(void)
  {
  	int r;
  
  	if (NULL == udev_ctx) {
  		udev_ctx = udev_new();
  		if (!udev_ctx) {
  			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");
                  return LIBUSB_ERROR_OTHER;
          }
  
          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");
                  return LIBUSB_ERROR_OTHER;
          }
  
          if (udev_monitor_enable_receiving(udev_monitor)) {
                  usbi_err(NULL, "failed to enable the udev monitor");
                  return LIBUSB_ERROR_OTHER;
          }
  
          udev_monitor_fd = udev_monitor_get_fd(udev_monitor);
  
          pthread_create(&linux_event_thread, NULL, linux_udev_event_thread_main, NULL);
  
          return LIBUSB_SUCCESS;
  }
  
  int linux_udev_stop_event_monitor(void)
  {
          if (-1 == udev_monitor_fd) {
                  /* this should never happen */
                  return LIBUSB_ERROR_OTHER;
          }
  
  	/* Cancel the event thread. This is the only way to garauntee the thread
  	   exits since closing the monitor fd won't necessarily cause poll
  	   to return. */
  	pthread_cancel(linux_event_thread);
  
  	/* 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;
  
          return LIBUSB_SUCCESS;
  }
  
  static void *linux_udev_event_thread_main(void __attribute__((unused)) *arg)
  {
  	struct pollfd fds = {.fd = udev_monitor_fd,
  			     .events = POLLIN};
  
  	usbi_dbg("udev event thread entering.");
  
  	while (1 == poll(&fds, 1, -1)) {
  		if (NULL == udev_monitor || POLLIN != fds.revents) {
  			break;
  		}
  
  		udev_hotplug_event();
  	}
  
  	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(void)
  {
  	struct udev_device* udev_dev;
  	const char* udev_action;
  	const char* sys_name = NULL;
  	uint8_t busnum = 0, devaddr = 0;
  	int detached;
  	int r;
  
  	if (NULL == udev_monitor) {
  		return;
  	}
  
  	do {
  		udev_dev = udev_monitor_receive_device(udev_monitor);
  		if (!udev_dev) {
  			usbi_err(NULL, "failed to read data from udev monitor socket.");
  			return;
  		}
  
  		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_hotplug_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;
  
  	if (NULL == udev_ctx) {
  		udev_ctx = udev_new();
  		if (!udev_ctx) {
  			return LIBUSB_ERROR_OTHER;
  		}
  	}
  
  	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;
  }
  
  

Download