mirror of
https://github.com/FeralInteractive/gamemode.git
synced 2025-06-06 07:37:21 +02:00
752d877196
* Minor C cleanup
- some symbols can be made static:
1. set_gov_state
2. everything in gamemode_client.h
- daemonize() can also take a const char*, since the name is only
passed to printf() or syslog()
- prevent shadowing of variables
- use explicit (void) as parameter-list more consistently
- use some more const.
Move cast to more appropriate place and document that execv() behaves
as if args where of type const *char and we trust on that.
- example: Just use main(void), which is also an acceptable ISO-C decl
- example: Use stderr for errors
* Fix -Wold-style-declaration issue
113 lines
3.3 KiB
C
113 lines
3.3 KiB
C
/*
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Copyright (c) 2017-2018, 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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#define _GNU_SOURCE
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#include "governors.h"
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#include "config.h"
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#include "governors-query.h"
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#include "logging.h"
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#include <linux/limits.h>
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#include <stdio.h>
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#include <sys/wait.h>
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#include <unistd.h>
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static const char *initial = NULL;
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/**
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* Cache the governor state as seen at startup
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*/
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void update_initial_gov_state(void)
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{
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initial = get_gov_state();
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}
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/**
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* Update the governors to the given argument, via pkexec
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*/
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bool set_governors(const char *value)
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{
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pid_t p;
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int status = 0;
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int ret = 0;
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int r = -1;
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const char *const govern = value ? value : initial;
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const char *const exec_args[] = {
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"/usr/bin/pkexec", LIBEXECDIR "/cpugovctl", "set", govern, NULL,
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};
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LOG_MSG("Requesting update of governor policy to %s\n", govern);
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if ((p = fork()) < 0) {
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LOG_ERROR("Failed to fork(): %s\n", strerror(errno));
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return false;
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} else if (p == 0) {
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/* Execute the command */
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/* Note about cast:
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* The statement about argv[] and envp[] being constants is
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* included to make explicit to future writers of language
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* bindings that these objects are completely constant.
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* http://pubs.opengroup.org/onlinepubs/9699919799/functions/exec.html
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*/
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if ((r = execv(exec_args[0], (char *const *)exec_args)) != 0) {
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LOG_ERROR("Failed to execute cpugovctl helper: %s %s\n", exec_args[1], strerror(errno));
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exit(EXIT_FAILURE);
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}
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_exit(EXIT_SUCCESS);
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} else {
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if (waitpid(p, &status, 0) < 0) {
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LOG_ERROR("Failed to waitpid(%d): %s\n", (int)p, strerror(errno));
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return false;
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}
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/* i.e. sigsev */
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if (!WIFEXITED(status)) {
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LOG_ERROR("Child process '%s' exited abnormally\n", exec_args[0]);
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}
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}
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if ((ret = WEXITSTATUS(status)) != 0) {
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LOG_ERROR("Failed to update cpu governor policy\n");
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return false;
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}
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return true;
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}
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/**
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* Return the cached governor seen at startup
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*/
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const char *get_initial_governor(void)
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{
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return initial;
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}
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