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#include <stdio.h>
#include <stdlib.h>
#include <libintl.h>
#include <locale.h>
#include <getopt.h>
#include <unistd.h>
#define set_freq_max(freq, core) write_str_to_file("scaling_max_freq", freq, core)
#define set_freq_min(freq, core) write_str_to_file("scaling_min_freq", freq, core)
#define set_speed(freq, core) write_str_to_file("scaling_setspeed", freq, core)
#define set_gov(gov, core) write_str_to_file("scaling_governor", gov, core)
void die_syntax(const char *prefix);
char write_str_to_file(const char *file, const char *data, int core);
int main(int argc, char *argv[])
{
char c = 0;
int core = -1;
char *frequency = NULL;
char *governor = NULL;
setlocale(LC_ALL, "");
bindtextdomain("paramano", LOCALEDIR);
textdomain("paramano");
if (getuid() != 0)
fprintf(stderr, "Warning: running as UID %d, not 0\n", getuid());
while ((c = getopt(argc, argv, "c:f:g:")) != -1)
{
switch (c)
{
case 'c':
core = atoi(optarg);
break;
case 'f':
frequency = optarg;
break;
case 'g':
governor = optarg;
break;
default:
die_syntax(argv[0]);
break;
}
}
if (core < 0 ||
(governor == NULL && frequency == NULL) ||
(governor != NULL && frequency != NULL))
die_syntax(argv[0]);
if (governor != NULL)
return set_gov(governor, core);
if (frequency != NULL)
return set_gov("userspace", core) | set_speed(frequency, core);
return 1;
}
void die_syntax(const char *prefix)
{
fprintf(stderr, _("%s {-f frequency|-g governor} -c core\n"), prefix);
exit(1);
}
char write_str_to_file(const char *file, const char *data, int core)
{
FILE *fd = NULL;
char file_path[1024];
/* Prepare file path */
snprintf(file_path, sizeof(file_path), "/sys/devices/system/cpu/cpu%d/cpufreq/%s", core, file);
/* Try to open file and write data to it */
if ( (fd = fopen(file_path, "w")) != NULL )
{
fputs(data, fd);
fclose(fd);
return 1;
}
/* Fallthrough: File couldn't be opened for writing */
fprintf(stderr, _("FAILED: Couldn't open %s for writing\n") , file_path);
return 0;
}
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