summaryrefslogtreecommitdiffstats
path: root/dom/gamepad/linux/udev.h
diff options
context:
space:
mode:
authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 19:33:14 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 19:33:14 +0000
commit36d22d82aa202bb199967e9512281e9a53db42c9 (patch)
tree105e8c98ddea1c1e4784a60a5a6410fa416be2de /dom/gamepad/linux/udev.h
parentInitial commit. (diff)
downloadfirefox-esr-upstream.tar.xz
firefox-esr-upstream.zip
Adding upstream version 115.7.0esr.upstream/115.7.0esrupstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'dom/gamepad/linux/udev.h')
-rw-r--r--dom/gamepad/linux/udev.h150
1 files changed, 150 insertions, 0 deletions
diff --git a/dom/gamepad/linux/udev.h b/dom/gamepad/linux/udev.h
new file mode 100644
index 0000000000..4e3f0b7865
--- /dev/null
+++ b/dom/gamepad/linux/udev.h
@@ -0,0 +1,150 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/*
+ * This file defines a wrapper around libudev so we can avoid
+ * linking directly to it and use dlopen instead.
+ */
+
+#ifndef HAL_LINUX_UDEV_H_
+#define HAL_LINUX_UDEV_H_
+
+#include <dlfcn.h>
+
+#include "mozilla/ArrayUtils.h"
+
+namespace mozilla {
+
+struct udev;
+struct udev_device;
+struct udev_enumerate;
+struct udev_list_entry;
+struct udev_monitor;
+
+class udev_lib {
+ public:
+ udev_lib() : lib(nullptr), udev(nullptr) {
+ // Be careful about ABI compat! 0 -> 1 didn't change any
+ // symbols this code relies on, per:
+ // https://lists.fedoraproject.org/pipermail/devel/2012-June/168227.html
+ const char* lib_names[] = {"libudev.so.0", "libudev.so.1"};
+ // Check whether a library is already loaded so we don't load two
+ // conflicting libs.
+ for (unsigned i = 0; i < ArrayLength(lib_names); i++) {
+ lib = dlopen(lib_names[i], RTLD_NOLOAD | RTLD_LAZY | RTLD_GLOBAL);
+ if (lib) {
+ break;
+ }
+ }
+ // If nothing loads the first time through, it means no version of libudev
+ // was already loaded.
+ if (!lib) {
+ for (unsigned i = 0; i < ArrayLength(lib_names); i++) {
+ lib = dlopen(lib_names[i], RTLD_LAZY | RTLD_GLOBAL);
+ if (lib) {
+ break;
+ }
+ }
+ }
+ if (lib && LoadSymbols()) {
+ udev = udev_new();
+ }
+ }
+
+ ~udev_lib() {
+ if (udev) {
+ udev_unref(udev);
+ }
+
+ if (lib) {
+ dlclose(lib);
+ }
+ }
+
+ explicit operator bool() { return udev; }
+
+ private:
+#define DLSYM(s) \
+ do { \
+ (s) = (decltype(s))dlsym(lib, #s); \
+ if (!(s)) return false; \
+ } while (0)
+
+ bool LoadSymbols() {
+ DLSYM(udev_new);
+ DLSYM(udev_unref);
+ DLSYM(udev_device_unref);
+ DLSYM(udev_device_new_from_syspath);
+ DLSYM(udev_device_get_devnode);
+ DLSYM(udev_device_get_parent_with_subsystem_devtype);
+ DLSYM(udev_device_get_property_value);
+ DLSYM(udev_device_get_action);
+ DLSYM(udev_device_get_sysattr_value);
+ DLSYM(udev_enumerate_new);
+ DLSYM(udev_enumerate_unref);
+ DLSYM(udev_enumerate_add_match_subsystem);
+ DLSYM(udev_enumerate_scan_devices);
+ DLSYM(udev_enumerate_get_list_entry);
+ DLSYM(udev_list_entry_get_next);
+ DLSYM(udev_list_entry_get_name);
+ DLSYM(udev_monitor_new_from_netlink);
+ DLSYM(udev_monitor_filter_add_match_subsystem_devtype);
+ DLSYM(udev_monitor_enable_receiving);
+ DLSYM(udev_monitor_get_fd);
+ DLSYM(udev_monitor_receive_device);
+ DLSYM(udev_monitor_unref);
+
+ return true;
+ }
+
+#undef DLSYM
+
+ void* lib;
+
+ public:
+ struct udev* udev;
+
+ // Function pointers returned from dlsym.
+ struct udev* (*udev_new)(void);
+ void (*udev_unref)(struct udev*);
+
+ void (*udev_device_unref)(struct udev_device*);
+ struct udev_device* (*udev_device_new_from_syspath)(struct udev*,
+ const char*);
+ const char* (*udev_device_get_devnode)(struct udev_device*);
+ struct udev_device* (*udev_device_get_parent_with_subsystem_devtype)(
+ struct udev_device*, const char*, const char*);
+ const char* (*udev_device_get_property_value)(struct udev_device*,
+ const char*);
+ const char* (*udev_device_get_action)(struct udev_device*);
+ const char* (*udev_device_get_sysattr_value)(struct udev_device*,
+ const char*);
+
+ struct udev_enumerate* (*udev_enumerate_new)(struct udev*);
+ void (*udev_enumerate_unref)(struct udev_enumerate*);
+ int (*udev_enumerate_add_match_subsystem)(struct udev_enumerate*,
+ const char*);
+ int (*udev_enumerate_scan_devices)(struct udev_enumerate*);
+ struct udev_list_entry* (*udev_enumerate_get_list_entry)(
+ struct udev_enumerate*);
+
+ struct udev_list_entry* (*udev_list_entry_get_next)(struct udev_list_entry*);
+ const char* (*udev_list_entry_get_name)(struct udev_list_entry*);
+
+ struct udev_monitor* (*udev_monitor_new_from_netlink)(struct udev*,
+ const char*);
+ int (*udev_monitor_filter_add_match_subsystem_devtype)(struct udev_monitor*,
+ const char*,
+ const char*);
+ int (*udev_monitor_enable_receiving)(struct udev_monitor*);
+ int (*udev_monitor_get_fd)(struct udev_monitor*);
+ struct udev_device* (*udev_monitor_receive_device)(struct udev_monitor*);
+ void (*udev_monitor_unref)(struct udev_monitor*);
+};
+
+} // namespace mozilla
+
+#endif // HAL_LINUX_UDEV_H_