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static double osfreq(void)
{
FILE *f;
double result;
int s;
f = fopen("/sys/devices/system/cpu/cpu0/cpufreq/scaling_max_freq", "r");
if (f) {
s = fscanf(f,"%lf",&result);
fclose(f);
if (s > 0) return 1000.0 * result;
}
f = fopen("/sys/devices/system/cpu/cpu0/clock_tick", "r");
if (f) {
s = fscanf(f,"%lf",&result);
fclose(f);
if (s > 0) return result;
}
f = fopen("/proc/cpuinfo","r");
if (f) {
for (;;) {
s = fscanf(f,"cpu MHz : %lf",&result);
if (s > 0) break;
if (s == 0) s = fscanf(f,"%*[^\n]\n");
if (s < 0) { result = 0; break; }
}
fclose(f);
if (result) return 1000000.0 * result;
}
f = fopen("/proc/cpuinfo","r");
if (f) {
for (;;) {
s = fscanf(f,"clock : %lf",&result);
if (s > 0) break;
if (s == 0) s = fscanf(f,"%*[^\n]\n");
if (s < 0) { result = 0; break; }
}
fclose(f);
if (result) return 1000000.0 * result;
}
f = popen("/usr/sbin/lsattr -E -l proc0 -a frequency 2>/dev/null","r");
if (f) {
s = fscanf(f,"frequency %lf",&result);
pclose(f);
if (s > 0) return result;
}
f = popen("/usr/sbin/psrinfo -v 2>/dev/null","r");
if (f) {
for (;;) {
s = fscanf(f," The %*s processor operates at %lf MHz",&result);
if (s > 0) break;
if (s == 0) s = fscanf(f,"%*[^\n]\n");
if (s < 0) { result = 0; break; }
}
pclose(f);
if (result) return 1000000.0 * result;
}
return 0;
}
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