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#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/types.h>

void usage(char *progname)
{
    fprintf(stderr,"Usage: %s [-i <interval>]\n",progname);
    exit(1);
}

int main(int argc, char *argv[])
{
    int arg;
    size_t alloc = 1000;
    uid_t userid = getuid();

    while ((arg = getopt(argc,argv,"")) != -1) {
        switch(arg) {
            default:
                usage(argv[0]);
                break;
        }
    }

    //const char *basecmd = "sudo turbostat -s -i 1 2>&1";
    char ghz[8];
    char *junkbuffer = malloc(sizeof(char)*1000);
    const char *basecmd = "turbostat -s -i 1 2>&1";

    seteuid(0);
    setuid(0);
    FILE *turboPipe = popen(basecmd,"r");
    seteuid(userid);
    setuid(userid);

    /* ignore first line */
    getline(&junkbuffer,&alloc,turboPipe);
    fscanf(turboPipe,"%*s %s %*s %*s %*s %*s %*s %*s %*s %*s %*s\n",ghz);
    free(junkbuffer);

    fprintf(stdout,"%s\n",ghz);
    pclose(turboPipe);

    return 0;
}