mirror of
https://github.com/mozilla/gecko-dev.git
synced 2024-12-05 20:15:58 +00:00
3440613a39
--HG-- rename : mfbt/Util.h => mfbt/ArrayUtils.h
149 lines
4.5 KiB
C++
149 lines
4.5 KiB
C++
/* 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);
|
|
}
|
|
}
|
|
|
|
operator bool() {
|
|
return udev;
|
|
}
|
|
|
|
private:
|
|
bool LoadSymbols() {
|
|
#define DLSYM(s) \
|
|
do { \
|
|
s = (typeof(s))dlsym(lib, #s); \
|
|
if (!s) return false; \
|
|
} while (0)
|
|
|
|
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);
|
|
#undef DLSYM
|
|
return true;
|
|
}
|
|
|
|
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_
|