int main (int argn, char** argv)
{
int cpuid;
int freq;
int numCPUs = 0;
char* gov;
char* gpath = malloc(100);
char* fpath = malloc(100);
if (argn < 3 || argn > 4)
{
fprintf(stderr, "Usage: %s <processorID> <frequency> [<governor>] \n",argv[0]);
exit(EXIT_FAILURE);
}
cpuid = atoi(argv[1]);
numCPUs = get_numCPUs();
if (cpuid < 0 || cpuid > numCPUs)
{
fprintf(stderr, "CPU %d not a valid CPU ID. Range from 0 to %d.\n",cpuid,numCPUs);
exit(EXIT_FAILURE);
}
freq = atoi(argv[2]);
if (freq <= 0)
{
fprintf(stderr, "Frequency must be greater than 0.\n");
exit(EXIT_FAILURE);
}
if (argn == 4)
{
gov = argv[3];
if ((strncmp(gov,"ondemand",12)) && (strncmp(gov,"performance",12))) {
fprintf(stderr, "Invalid governor %s!\n",gov);
return (EXIT_FAILURE);
}
snprintf(gpath, 60, "/sys/devices/system/cpu/cpu%d/cpufreq/scaling_governor", cpuid);
FILE* f = fopen(gpath, "w");
if (f == NULL) {
fprintf(stderr, "Unable to open path for writing\n");
return (EXIT_FAILURE);
}
fprintf(f,"%s",gov);
fclose(f);
return(EXIT_SUCCESS);
}
snprintf(gpath, 60, "/sys/devices/system/cpu/cpu%d/cpufreq/scaling_governor", cpuid);
snprintf(fpath, 60, "/sys/devices/system/cpu/cpu%d/cpufreq/scaling_setspeed", cpuid);
FILE* f = fopen(gpath, "w");
if (f == NULL) {
fprintf(stderr, "Unable to open path for writing\n");
return (EXIT_FAILURE);
}
fprintf(f,"userspace");
fclose(f);
f = fopen(fpath, "w");
if (f == NULL) {
fprintf(stderr, "Unable to open path for writing\n");
return (EXIT_FAILURE);
}
fprintf(f,"%d",freq);
fclose(f);
return(EXIT_SUCCESS);
}
/* ##### MAIN FUNCTION DEFINITION ################## */
int main (int argn, char** argv)
{
int i = 0;
int tmp;
int cpuid;
int freq = 0;
int numCPUs = 0;
char* gov;
char* gpath = malloc(100);
char* fpath = malloc(100);
if (argn < 3 || argn > 4)
{
fprintf(stderr, "Usage: %s <processorID> <frequency> [<governor>] \n",argv[0]);
free(gpath);
free(fpath);
exit(EXIT_FAILURE);
}
cpuid = atoi(argv[1]);
numCPUs = get_numCPUs();
if (cpuid < 0 || cpuid > numCPUs)
{
fprintf(stderr, "CPU %d not a valid CPU ID. Range from 0 to %d.\n", cpuid, numCPUs);
free(gpath);
free(fpath);
exit(EXIT_FAILURE);
}
freq = atoi(argv[2]);
if (freq <= 0)
{
fprintf(stderr, "Frequency must be greater than 0.\n");
free(gpath);
free(fpath);
exit(EXIT_FAILURE);
}
if (argn == 4)
{
FILE* f;
gov = argv[3];
if ((strncmp(gov,"ondemand",8) != 0) &&
(strncmp(gov,"performance",11) != 0) &&
(strncmp(gov,"conservative",12) != 0) &&
(strncmp(gov,"powersave",9) != 0)) {
fprintf(stderr, "Invalid governor %s!\n",gov);
free(gpath);
free(fpath);
return (EXIT_FAILURE);
}
for (i=0; i<2; i++)
{
snprintf(fpath, 99, "/sys/devices/system/cpu/cpu%d/cpufreq/%s", cpuid, getfiles[i]);
f = fopen(fpath, "r");
if (f == NULL) {
fprintf(stderr, "Unable to open path %s for writing\n", fpath);
free(gpath);
free(fpath);
return (EXIT_FAILURE);
}
tmp = fread(fpath, 100, sizeof(char), f);
freq = atoi(fpath);
fclose(f);
snprintf(fpath, 99, "/sys/devices/system/cpu/cpu%d/cpufreq/%s", cpuid, setfiles[i]);
f = fopen(fpath, "w");
if (f == NULL) {
fprintf(stderr, "Unable to open path %s for writing\n",fpath);
free(gpath);
free(fpath);
return (EXIT_FAILURE);
}
fprintf(f,"%d",freq);
fclose(f);
}
snprintf(gpath, 99, "/sys/devices/system/cpu/cpu%d/cpufreq/scaling_governor", cpuid);
f = fopen(gpath, "w");
if (f == NULL) {
fprintf(stderr, "Unable to open path %s for writing\n", gpath);
free(gpath);
free(fpath);
return (EXIT_FAILURE);
}
fprintf(f,"%s",gov);
fclose(f);
free(gpath);
free(fpath);
return(EXIT_SUCCESS);
}
snprintf(gpath, 99, "/sys/devices/system/cpu/cpu%d/cpufreq/scaling_governor", cpuid);
FILE* f = fopen(gpath, "w");
if (f == NULL) {
fprintf(stderr, "Unable to open path %s for writing\n", gpath);
free(gpath);
free(fpath);
return (EXIT_FAILURE);
}
if ((argn == 4) &&
((strncmp(argv[3],"ondemand",8) == 0) ||
(strncmp(argv[3],"performance",11) == 0) ||
(strncmp(argv[3],"conservative",12) == 0) ||
(strncmp(argv[3],"powersave",9) == 0)))
{
fprintf(f, "%s", argv[3]);
tmp = 1;
}
else
{
fprintf(f, "%s", "userspace");
tmp = 3;
}
fclose(f);
for (i=0;i<tmp;i++)
{
snprintf(fpath, 99, "/sys/devices/system/cpu/cpu%d/cpufreq/%s", cpuid, setfiles[i]);
f = fopen(fpath, "w");
if (f == NULL) {
fprintf(stderr, "Unable to open path %s for writing\n",fpath);
free(gpath);
free(fpath);
return (EXIT_FAILURE);
}
fprintf(f,"%d",freq);
fclose(f);
}
free(gpath);
free(fpath);
return(EXIT_SUCCESS);
}
