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@@ -0,0 +1,379 @@
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+// SPDX-FileCopyrightText: Copyright 2017-2019 Feral Interactive
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+// SPDX-License-Identifier: BSD-3-Clause
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+
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+/*
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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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+
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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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+
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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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+
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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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+ */
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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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+
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+#include <stdbool.h>
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+#include <stdio.h>
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+
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+#include <dlfcn.h>
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+#include <string.h>
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+
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+#include <assert.h>
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+
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+#include <sys/types.h>
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+
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+static char internal_gamemode_client_error_string[512] = { 0 };
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+
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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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+
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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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+
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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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+/**
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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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+
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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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+
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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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+/**
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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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+
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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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+
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+ void *libgamemode = NULL;
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+
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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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+
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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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+
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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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+
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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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+/**
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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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+
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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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+
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+ return REAL_internal_gamemode_error_string();
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+}
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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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+
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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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+
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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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+
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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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+#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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+
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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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+
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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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+
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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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+__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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+
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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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+
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+ return REAL_internal_gamemode_query_status();
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+}
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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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+
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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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+
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+ return REAL_internal_gamemode_request_start_for(pid);
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+}
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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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+
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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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+
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+ return REAL_internal_gamemode_request_end_for(pid);
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+}
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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)
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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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+
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+ if (REAL_internal_gamemode_query_status_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_query_status_for missing (older host?)");
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+ return -1;
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+ }
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+
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+ return REAL_internal_gamemode_query_status_for(pid);
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+}
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+
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+#endif // CLIENT_GAMEMODE_H
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