added available frequencies split into strings and some fopen checks
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d61c7f8dcd
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2cd6dd4b71
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@ -1,4 +1,6 @@
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#include <stdio.h>
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#include <stdlib.h>
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#define CURGOV "/sys/devices/system/cpu/cpufreq/policy0/scaling_governor"
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#define FREQS "/sys/devices/system/cpu/cpufreq/policy0/scaling_available_frequencies"
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#define MAXSPDPATH "/sys/devices/system/cpu/cpufreq/policy0/scaling_max_freq"
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@ -7,7 +9,7 @@
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int comparestrings(char *a, char *b){
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int c = 0;
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while(a[c]!='\0' && b[c]!='\0'){
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while(a[c] != '\0' && b[c] != '\0'){
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if(a[c] != b[c]){
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return 1;
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}
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@ -18,33 +20,33 @@ int comparestrings(char *a, char *b){
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int getfilec(FILE *file, char arr[]){
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int c, i;
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i=0;
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while((c=fgetc(file)) != EOF){
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arr[i]=c;
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i = 0;
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while((c = fgetc(file)) != EOF){
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arr[i] = c;
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i++;
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}
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arr[i]='\0';
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arr[i] = '\0';
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return i;
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}
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int powerof(int base, int exponent){
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int i, result;
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if (exponent==0){
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return result=1;
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if (exponent == 0){
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return result = 1;
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}
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result=base;
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for(i=0; i<exponent-1; i++){
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result*=base;
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result = base;
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for(i = 0; i < exponent - 1; i++){
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result *= base;
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}
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return result;
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}
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int stringtoint(char number[], int length){
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int j, result;
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result=0;
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j=0;
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while(length-1>=0){
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result+=((int)number[length-1]-'0')*(powerof(10,j));
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result = 0;
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j = 0;
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while(length - 1 >= 0){
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result += ((int)number[length - 1] - '0') * (powerof(10, j));
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j++;
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length--;
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}
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@ -53,41 +55,110 @@ int stringtoint(char number[], int length){
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int stringlength(char string[]){
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int i = 0;
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while(string[i]!='\0'){
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while(string[i] != '\0'){
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i++;
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}
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return i;
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}
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int splitstr(char** dest, char line[], int index1, int index2){
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int offset = index1;
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while (line[index1] != ' ' && index1 < stringlength(line)){
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index1++;
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}
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char* p = malloc(sizeof (char)*index1);
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int i;
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for(i = 0; i < index1 - offset; i++){
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p[i] = line[i + offset];
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}
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p[i] = '\0';
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dest[index2] = p;
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return index1 + 1;
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}
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int countblanks(char line[]){
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int i = 0;
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int j = 0;
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while(line[i] != '\0'){
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if (line[i] == ' '){
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j++;
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}
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i++;
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}
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return j;
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}
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int main(int argc, char** argv){
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/* check for no arguments or help */
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if (argc == 1 || comparestrings(argv[1], "-h") == 0
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|| comparestrings(argv[1], "--help") == 0){
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printf("usage: homemade_speedstep <max temp> <min temp>\n");
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printf(" homemade_speedstep [-h | --help]\n");
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printf(" -h | --help prints out this help message\n");
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fprintf(stderr, "usage: homemade_speedstep <max temp> <min temp>\n");
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fprintf(stderr, " homemade_speedstep [-h | --help]\n");
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fprintf(stderr, " -h | --help prints out this help message\n");
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return 0;
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}
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if (argc!=3){
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printf("error: wrong ammount of arguments given\n");
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printf(" see homemade_speedstep --help\n");
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/* check for correct ammount of arguments */
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if (argc != 3){
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fprintf(stderr, "error: wrong ammount of arguments given\n");
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fprintf(stderr, " see homemade_speedstep --help\n");
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return 1;
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}
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int maxtemp = stringtoint(argv[1], stringlength(argv[1]));
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int mintemp = stringtoint(argv[2], stringlength(argv[2]));
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char gov[20];
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FILE *govfile = fopen(CURGOV, "r");
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getfilec(govfile, gov);
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if (comparestrings(gov, "userspace\n") != 0){
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printf("error: userspace governor not set\n");
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fclose(govfile);
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/* set maxtemp and mintemp TODO: check for integer and difference */
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const int maxtemp = stringtoint(argv[1], stringlength(argv[1]));
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const int mintemp = stringtoint(argv[2], stringlength(argv[2]));
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/* try to open scaling_current_governor, exit on fail */
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FILE* govfile = fopen(CURGOV, "r");
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if (govfile == NULL){
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fprintf(stderr, "error: couldn't open scaling_current_governor\n");
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fprintf(stderr, " check that you have support for cpufreq\n");
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fprintf(stderr, " and the userspace governor in your kernel\n");
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fprintf(stderr, " also check that you're running this program\n");
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fprintf(stderr, " as root\n");
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return 2;
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}
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FILE *freqsfile = fopen(FREQS, "r");
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FILE *curmaxfile = fopen(MAXSPDPATH, "r");
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FILE *setspeedfile = fopen(SETSPDPATH, "r");
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FILE *curtempfile = fopen(CURTEMPPATH, "r");
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/* assign content of govfile to a temporary char array */
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char* gov = malloc(sizeof(char) * 20);
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getfilec(govfile, gov);
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/* check content of scaling_current_governor and exit on failure */
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if (comparestrings(gov, "userspace\n") != 0){
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fprintf(stderr, "error: userspace governor not set\n");
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/* free memory and close file */
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free(gov);
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fclose(govfile);
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return 3;
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}
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/* free memory and close file */
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free(gov);
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fclose(govfile);
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/* try to open scaling_available_frequencies, exit on fail */
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FILE *freqsfile = fopen(FREQS, "r");
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if (freqsfile == NULL){
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fprintf(stderr, "error: couldn't open scaling_available_frequencies\n");
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fprintf(stderr, " check that you have support for cpufreq\n");
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fprintf(stderr, " in your kernel and that the program is\n");
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fprintf(stderr, " running as root\n");
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return 4;
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}
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/* assign content of freqsfile to a temporary char array */
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char* freqsfilec = malloc(sizeof(char) * 200);
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getfilec(freqsfile, freqsfilec);
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int stepc = countblanks(freqsfilec);
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/* create a char ** array with pointers to freq steps */
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char ** steps = malloc(sizeof(char*) * stepc);
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int index = 0;
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int i;
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for(i = 0; i < stepc; i++){
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index = splitstr(steps, freqsfilec, index, i);
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}
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/* free memory and close file */
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free(freqsfilec);
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fclose(freqsfile);
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/* from here onwards an infinite while loop should start */
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/* cleanup for graceful exit */
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free(steps);
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FILE* curmaxfile = fopen(MAXSPDPATH, "r");
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FILE* setspeedfile = fopen(SETSPDPATH, "r");
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FILE* curtempfile = fopen(CURTEMPPATH, "r");
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fclose(curmaxfile);
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fclose(setspeedfile);
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fclose(curtempfile);
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