377 lines
12 KiB
C
377 lines
12 KiB
C
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/*
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Copyright (c) 2017-2019, Feral Interactive
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All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are met:
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* Redistributions of source code must retain the above copyright notice,
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this list of conditions and the following disclaimer.
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* Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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* Neither the name of Feral Interactive nor the names of its contributors
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may be used to endorse or promote products derived from this software
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without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef CLIENT_GAMEMODE_H
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#define CLIENT_GAMEMODE_H
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/*
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* GameMode supports the following client functions
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* Requests are refcounted in the daemon
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*
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* int gamemode_request_start() - Request gamemode starts
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* 0 if the request was sent successfully
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* -1 if the request failed
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*
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* int gamemode_request_end() - Request gamemode ends
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* 0 if the request was sent successfully
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* -1 if the request failed
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*
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* GAMEMODE_AUTO can be defined to make the above two functions apply during static init and
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* destruction, as appropriate. In this configuration, errors will be printed to stderr
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*
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* int gamemode_query_status() - Query the current status of gamemode
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* 0 if gamemode is inactive
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* 1 if gamemode is active
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* 2 if gamemode is active and this client is registered
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* -1 if the query failed
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*
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* int gamemode_request_start_for(pid_t pid) - Request gamemode starts for another process
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* 0 if the request was sent successfully
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* -1 if the request failed
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* -2 if the request was rejected
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*
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* int gamemode_request_end_for(pid_t pid) - Request gamemode ends for another process
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* 0 if the request was sent successfully
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* -1 if the request failed
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* -2 if the request was rejected
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*
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* int gamemode_query_status_for(pid_t pid) - Query status of gamemode for another process
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* 0 if gamemode is inactive
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* 1 if gamemode is active
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* 2 if gamemode is active and this client is registered
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* -1 if the query failed
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*
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* const char* gamemode_error_string() - Get an error string
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* returns a string describing any of the above errors
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*
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* Note: All the above requests can be blocking - dbus requests can and will block while the daemon
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* handles the request. It is not recommended to make these calls in performance critical code
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*/
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#include <stdbool.h>
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#include <stdio.h>
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#include <dlfcn.h>
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#include <string.h>
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#include <assert.h>
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#include <sys/types.h>
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static char internal_gamemode_client_error_string[512] = { 0 };
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/**
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* Load libgamemode dynamically to dislodge us from most dependencies.
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* This allows clients to link and/or use this regardless of runtime.
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* See SDL2 for an example of the reasoning behind this in terms of
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* dynamic versioning as well.
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*/
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static volatile int internal_libgamemode_loaded = 1;
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/* Typedefs for the functions to load */
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typedef int (*api_call_return_int)(void);
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typedef const char *(*api_call_return_cstring)(void);
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typedef int (*api_call_pid_return_int)(pid_t);
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/* Storage for functors */
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static api_call_return_int REAL_internal_gamemode_request_start = NULL;
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static api_call_return_int REAL_internal_gamemode_request_end = NULL;
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static api_call_return_int REAL_internal_gamemode_query_status = NULL;
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static api_call_return_cstring REAL_internal_gamemode_error_string = NULL;
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static api_call_pid_return_int REAL_internal_gamemode_request_start_for = NULL;
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static api_call_pid_return_int REAL_internal_gamemode_request_end_for = NULL;
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static api_call_pid_return_int REAL_internal_gamemode_query_status_for = NULL;
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/**
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* Internal helper to perform the symbol binding safely.
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*
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* Returns 0 on success and -1 on failure
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*/
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__attribute__((always_inline)) static inline int internal_bind_libgamemode_symbol(
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void *handle, const char *name, void **out_func, size_t func_size, bool required)
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{
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void *symbol_lookup = NULL;
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char *dl_error = NULL;
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/* Safely look up the symbol */
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symbol_lookup = dlsym(handle, name);
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dl_error = dlerror();
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if (required && (dl_error || !symbol_lookup)) {
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snprintf(internal_gamemode_client_error_string,
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sizeof(internal_gamemode_client_error_string),
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"dlsym failed - %s",
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dl_error);
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return -1;
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}
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/* Have the symbol correctly, copy it to make it usable */
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memcpy(out_func, &symbol_lookup, func_size);
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return 0;
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}
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/**
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* Loads libgamemode and needed functions
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*
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* Returns 0 on success and -1 on failure
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*/
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__attribute__((always_inline)) static inline int internal_load_libgamemode(void)
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{
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/* We start at 1, 0 is a success and -1 is a fail */
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if (internal_libgamemode_loaded != 1) {
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return internal_libgamemode_loaded;
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}
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/* Anonymous struct type to define our bindings */
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struct binding {
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const char *name;
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void **functor;
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size_t func_size;
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bool required;
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} bindings[] = {
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{ "real_gamemode_request_start",
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(void **)&REAL_internal_gamemode_request_start,
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sizeof(REAL_internal_gamemode_request_start),
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true },
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{ "real_gamemode_request_end",
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(void **)&REAL_internal_gamemode_request_end,
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sizeof(REAL_internal_gamemode_request_end),
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true },
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{ "real_gamemode_query_status",
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(void **)&REAL_internal_gamemode_query_status,
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sizeof(REAL_internal_gamemode_query_status),
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false },
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{ "real_gamemode_error_string",
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(void **)&REAL_internal_gamemode_error_string,
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sizeof(REAL_internal_gamemode_error_string),
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true },
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{ "real_gamemode_request_start_for",
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(void **)&REAL_internal_gamemode_request_start_for,
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sizeof(REAL_internal_gamemode_request_start_for),
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false },
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{ "real_gamemode_request_end_for",
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(void **)&REAL_internal_gamemode_request_end_for,
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sizeof(REAL_internal_gamemode_request_end_for),
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false },
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{ "real_gamemode_query_status_for",
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(void **)&REAL_internal_gamemode_query_status_for,
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sizeof(REAL_internal_gamemode_query_status_for),
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false },
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};
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void *libgamemode = NULL;
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/* Try and load libgamemode */
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libgamemode = dlopen("libgamemode.so.0", RTLD_NOW);
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if (!libgamemode) {
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/* Attempt to load unversioned library for compatibility with older
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* versions (as of writing, there are no ABI changes between the two -
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* this may need to change if ever ABI-breaking changes are made) */
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libgamemode = dlopen("libgamemode.so", RTLD_NOW);
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if (!libgamemode) {
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snprintf(internal_gamemode_client_error_string,
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sizeof(internal_gamemode_client_error_string),
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"dlopen failed - %s",
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dlerror());
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internal_libgamemode_loaded = -1;
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return -1;
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}
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}
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/* Attempt to bind all symbols */
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for (size_t i = 0; i < sizeof(bindings) / sizeof(bindings[0]); i++) {
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struct binding *binder = &bindings[i];
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if (internal_bind_libgamemode_symbol(libgamemode,
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binder->name,
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binder->functor,
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binder->func_size,
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binder->required)) {
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internal_libgamemode_loaded = -1;
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return -1;
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};
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}
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/* Success */
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internal_libgamemode_loaded = 0;
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return 0;
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}
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/**
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* Redirect to the real libgamemode
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*/
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__attribute__((always_inline)) static inline const char *gamemode_error_string(void)
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{
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/* If we fail to load the system gamemode, or we have an error string already, return our error
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* string instead of diverting to the system version */
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if (internal_load_libgamemode() < 0 || internal_gamemode_client_error_string[0] != '\0') {
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return internal_gamemode_client_error_string;
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}
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/* Assert for static analyser that the function is not NULL */
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assert(REAL_internal_gamemode_error_string != NULL);
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return REAL_internal_gamemode_error_string();
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}
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/**
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* Redirect to the real libgamemode
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* Allow automatically requesting game mode
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* Also prints errors as they happen.
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*/
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#ifdef GAMEMODE_AUTO
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__attribute__((constructor))
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#else
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__attribute__((always_inline)) static inline
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#endif
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int gamemode_request_start(void)
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{
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/* Need to load gamemode */
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if (internal_load_libgamemode() < 0) {
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#ifdef GAMEMODE_AUTO
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fprintf(stderr, "gamemodeauto: %s\n", gamemode_error_string());
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#endif
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return -1;
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}
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/* Assert for static analyser that the function is not NULL */
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assert(REAL_internal_gamemode_request_start != NULL);
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if (REAL_internal_gamemode_request_start() < 0) {
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#ifdef GAMEMODE_AUTO
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fprintf(stderr, "gamemodeauto: %s\n", gamemode_error_string());
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#endif
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return -1;
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}
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return 0;
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}
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/* Redirect to the real libgamemode */
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#ifdef GAMEMODE_AUTO
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__attribute__((destructor))
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#else
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__attribute__((always_inline)) static inline
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#endif
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int gamemode_request_end(void)
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{
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/* Need to load gamemode */
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if (internal_load_libgamemode() < 0) {
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#ifdef GAMEMODE_AUTO
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fprintf(stderr, "gamemodeauto: %s\n", gamemode_error_string());
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#endif
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return -1;
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}
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/* Assert for static analyser that the function is not NULL */
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assert(REAL_internal_gamemode_request_end != NULL);
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if (REAL_internal_gamemode_request_end() < 0) {
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#ifdef GAMEMODE_AUTO
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fprintf(stderr, "gamemodeauto: %s\n", gamemode_error_string());
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#endif
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return -1;
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}
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return 0;
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}
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/* Redirect to the real libgamemode */
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__attribute__((always_inline)) static inline int gamemode_query_status(void)
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{
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/* Need to load gamemode */
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if (internal_load_libgamemode() < 0) {
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return -1;
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}
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if (REAL_internal_gamemode_query_status == NULL) {
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snprintf(internal_gamemode_client_error_string,
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sizeof(internal_gamemode_client_error_string),
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"gamemode_query_status missing (older host?)");
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return -1;
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}
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return REAL_internal_gamemode_query_status();
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}
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/* Redirect to the real libgamemode */
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__attribute__((always_inline)) static inline int gamemode_request_start_for(pid_t pid)
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{
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/* Need to load gamemode */
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if (internal_load_libgamemode() < 0) {
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return -1;
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}
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if (REAL_internal_gamemode_request_start_for == NULL) {
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snprintf(internal_gamemode_client_error_string,
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sizeof(internal_gamemode_client_error_string),
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"gamemode_request_start_for missing (older host?)");
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return -1;
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}
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return REAL_internal_gamemode_request_start_for(pid);
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}
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/* Redirect to the real libgamemode */
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__attribute__((always_inline)) static inline int gamemode_request_end_for(pid_t pid)
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{
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/* Need to load gamemode */
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if (internal_load_libgamemode() < 0) {
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return -1;
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}
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if (REAL_internal_gamemode_request_end_for == NULL) {
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snprintf(internal_gamemode_client_error_string,
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sizeof(internal_gamemode_client_error_string),
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"gamemode_request_end_for missing (older host?)");
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return -1;
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}
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return REAL_internal_gamemode_request_end_for(pid);
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}
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/* Redirect to the real libgamemode */
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__attribute__((always_inline)) static inline int gamemode_query_status_for(pid_t pid)
|
||
|
|
{
|
||
|
|
/* Need to load gamemode */
|
||
|
|
if (internal_load_libgamemode() < 0) {
|
||
|
|
return -1;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (REAL_internal_gamemode_query_status_for == NULL) {
|
||
|
|
snprintf(internal_gamemode_client_error_string,
|
||
|
|
sizeof(internal_gamemode_client_error_string),
|
||
|
|
"gamemode_query_status_for missing (older host?)");
|
||
|
|
return -1;
|
||
|
|
}
|
||
|
|
|
||
|
|
return REAL_internal_gamemode_query_status_for(pid);
|
||
|
|
}
|
||
|
|
|
||
|
|
#endif // CLIENT_GAMEMODE_H
|