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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-28 14:29:10 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-28 14:29:10 +0000 |
commit | 2aa4a82499d4becd2284cdb482213d541b8804dd (patch) | |
tree | b80bf8bf13c3766139fbacc530efd0dd9d54394c /dom/gamepad/linux/udev.h | |
parent | Initial commit. (diff) | |
download | firefox-2aa4a82499d4becd2284cdb482213d541b8804dd.tar.xz firefox-2aa4a82499d4becd2284cdb482213d541b8804dd.zip |
Adding upstream version 86.0.1.upstream/86.0.1upstream
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.h | 150 |
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_ |