mirror of
https://github.com/FeralInteractive/gamemode.git
synced 2025-10-31 14:04:14 +01:00
1c38a6047e
Rather than when gamemoded is started. As see in Issue #52. A small refactor here to ensure things stay consistent, especially to stop storing a pointer from get_gov_state that might have had it's memory changed at some point, confusingly.
147 lines
4.1 KiB
C
147 lines
4.1 KiB
C
/*
|
|
|
|
Copyright (c) 2017-2018, Feral Interactive
|
|
All rights reserved.
|
|
|
|
Redistribution and use in source and binary forms, with or without
|
|
modification, are permitted provided that the following conditions are met:
|
|
|
|
* Redistributions of source code must retain the above copyright notice,
|
|
this list of conditions and the following disclaimer.
|
|
* Redistributions in binary form must reproduce the above copyright
|
|
notice, this list of conditions and the following disclaimer in the
|
|
documentation and/or other materials provided with the distribution.
|
|
* Neither the name of Feral Interactive nor the names of its contributors
|
|
may be used to endorse or promote products derived from this software
|
|
without specific prior written permission.
|
|
|
|
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
|
|
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
|
|
LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
|
|
CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
|
|
SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
|
|
INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
|
|
CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
|
|
ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
|
POSSIBILITY OF SUCH DAMAGE.
|
|
|
|
*/
|
|
|
|
#define _GNU_SOURCE
|
|
|
|
#include "governors-query.h"
|
|
#include "logging.h"
|
|
|
|
#include <glob.h>
|
|
#include <stdio.h>
|
|
#include <string.h>
|
|
|
|
/**
|
|
* Discover all governers on the system.
|
|
*
|
|
* Located at /sys/devices/system/cpu/cpu(*)/cpufreq/scaling_governor
|
|
*/
|
|
int fetch_governors(char governors[MAX_GOVERNORS][MAX_GOVERNOR_LENGTH])
|
|
{
|
|
glob_t glo = { 0 };
|
|
static const char *path = "/sys/devices/system/cpu/cpu*/cpufreq/scaling_governor";
|
|
|
|
/* Assert some sanity on this glob */
|
|
if (glob(path, GLOB_NOSORT, NULL, &glo) != 0) {
|
|
LOG_ERROR("glob failed for cpu governors: (%s)\n", strerror(errno));
|
|
return 0;
|
|
}
|
|
|
|
if (glo.gl_pathc < 1) {
|
|
globfree(&glo);
|
|
LOG_ERROR("no cpu governors found\n");
|
|
return 0;
|
|
}
|
|
|
|
int num_governors = 0;
|
|
|
|
/* Walk the glob set */
|
|
for (size_t i = 0; i < glo.gl_pathc; i++) {
|
|
if (i >= MAX_GOVERNORS) {
|
|
break;
|
|
}
|
|
|
|
/* Get the real path to the file.
|
|
* Traditionally cpufreq symlinks to a policy directory that can
|
|
* be shared, so let's prevent duplicates.
|
|
*/
|
|
char fullpath[PATH_MAX] = { 0 };
|
|
const char *ptr = realpath(glo.gl_pathv[i], fullpath);
|
|
if (fullpath != ptr) {
|
|
continue;
|
|
}
|
|
|
|
/* Only add this governor if it is unique */
|
|
for (int j = 0; j < num_governors; j++) {
|
|
if (strncmp(fullpath, governors[i], MAX_GOVERNOR_LENGTH) == 0) {
|
|
continue;
|
|
}
|
|
}
|
|
|
|
/* Copy this governor into the output set */
|
|
strncpy(governors[num_governors], fullpath, MAX_GOVERNOR_LENGTH);
|
|
num_governors++;
|
|
}
|
|
|
|
globfree(&glo);
|
|
return num_governors;
|
|
}
|
|
|
|
/**
|
|
* Return the current governor state
|
|
*/
|
|
const char *get_gov_state(void)
|
|
{
|
|
/* Persistent governor state */
|
|
static char governor[64] = { 0 };
|
|
memset(governor, 0, sizeof(governor));
|
|
|
|
/* State for all governors */
|
|
char governors[MAX_GOVERNORS][MAX_GOVERNOR_LENGTH] = { { 0 } };
|
|
int num = fetch_governors(governors);
|
|
|
|
/* Check the list */
|
|
for (int i = 0; i < num; i++) {
|
|
const char *gov = governors[i];
|
|
|
|
FILE *f = fopen(gov, "r");
|
|
if (!f) {
|
|
LOG_ERROR("Failed to open file for read %s\n", gov);
|
|
continue;
|
|
}
|
|
|
|
/* Grab the file length */
|
|
fseek(f, 0, SEEK_END);
|
|
long length = ftell(f);
|
|
fseek(f, 0, SEEK_SET);
|
|
|
|
char contents[length];
|
|
|
|
if (fread(contents, 1, (size_t)length, f) > 0) {
|
|
/* Files have a newline */
|
|
strtok(contents, "\n");
|
|
if (strlen(governor) > 0 && strncmp(governor, contents, 64) != 0) {
|
|
/* Don't handle the mixed case, this shouldn't ever happen
|
|
* But it is a clear sign we shouldn't carry on */
|
|
LOG_ERROR("Governors malformed: got \"%s\", expected \"%s\"", contents, governor);
|
|
return "malformed";
|
|
}
|
|
|
|
strncpy(governor, contents, sizeof(governor));
|
|
} else {
|
|
LOG_ERROR("Failed to read contents of %s\n", gov);
|
|
}
|
|
|
|
fclose(f);
|
|
}
|
|
|
|
return governor;
|
|
}
|