Linux: Dynamically load libudev.

device/udev_linux/udev.h

+// Copyright 2014 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef DEVICE_UDEV_LINUX_UDEV_H_
+#define DEVICE_UDEV_LINUX_UDEV_H_
+
+#include <stdarg.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+
+#if !defined(USE_UDEV)
+#error "USE_UDEV not defined"
+#endif
+
+// Adapted from libudev.h.
+#define udev_list_entry_foreach(list_entry, first_entry) \
+  for (list_entry = first_entry; list_entry != NULL;     \
+       list_entry = ::device::udev_list_entry_get_next(list_entry))
+
+// Forward declarations of opaque structs.
+struct udev;
+struct udev_device;
+struct udev_enumerate;
+struct udev_list_entry;
+struct udev_monitor;
+
+namespace device {
+
+const char* udev_device_get_action(udev_device* udev_device);
+const char* udev_device_get_devnode(udev_device* udev_device);
+udev_device* udev_device_get_parent(udev_device* udev_device);
+udev_device* udev_device_get_parent_with_subsystem_devtype(
+    udev_device* udev_device,
+    const char* subsystem,
+    const char* devtype);
+const char* udev_device_get_property_value(udev_device* udev_device,
+                                           const char* key);
+const char* udev_device_get_subsystem(udev_device* udev_device);
+const char* udev_device_get_sysattr_value(udev_device* udev_device,
+                                          const char* sysattr);
+const char* udev_device_get_sysname(udev_device* udev_device);
+const char* udev_device_get_syspath(udev_device* udev_device);
+udev_device* udev_device_new_from_devnum(udev* udev, char type, dev_t devnum);
+udev_device* udev_device_new_from_syspath(udev* udev, const char* syspath);
+void udev_device_unref(udev_device* udev_device);
+int udev_enumerate_add_match_subsystem(udev_enumerate* udev_enumerate,
+                                       const char* subsystem);
+udev_list_entry* udev_enumerate_get_list_entry(udev_enumerate* udev_enumerate);
+udev_enumerate* udev_enumerate_new(udev* udev);
+int udev_enumerate_scan_devices(udev_enumerate* udev_enumerate);
+void udev_enumerate_unref(udev_enumerate* udev_enumerate);
+udev_list_entry* udev_list_entry_get_next(udev_list_entry* list_entry);
+const char* udev_list_entry_get_name(udev_list_entry* list_entry);
+int udev_monitor_enable_receiving(udev_monitor* udev_monitor);
+int udev_monitor_filter_add_match_subsystem_devtype(udev_monitor* udev_monitor,
+                                                    const char* subsystem,
+                                                    const char* devtype);
+int udev_monitor_get_fd(udev_monitor* udev_monitor);
+udev_monitor* udev_monitor_new_from_netlink(udev* udev, const char* name);
+udev_device* udev_monitor_receive_device(udev_monitor* udev_monitor);
+void udev_monitor_unref(udev_monitor* udev_monitor);
+udev* udev_new();
+void udev_set_log_fn(
+    struct udev* udev,
+    void (*log_fn)(struct udev* udev, int priority, const char* file, int line,
+                   const char* fn, const char* format, va_list args));
+void udev_set_log_priority(struct udev* udev, int priority);
+void udev_unref(udev* udev);
+
+}  // namespace device
+
+#endif  // DEVICE_UDEV_LINUX_UDEV_H_