Here is a prog to do that (taken from a standard utility iostat) but
gives you the cpu idle time etc.
/*Program for the finding out of the runtime cpu statistics .*/
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
struct cpu_info {
unsigned long long user;
unsigned long long system;
unsigned long long idle;
unsigned long long iowait;
} new_cpu, old_cpu;
FILE *cpufp; /* /proc/stat */
char buffer[256]; /* Temporary buffer for parsing */
unsigned int n_partitions; /* Number of partitions */
unsigned int ncpu; /* Number of processors */
unsigned int kernel; /* Kernel: 4 (2.4, /proc/partitions)*/
void handle_error(const char *string, int error)
{
if (error) {
fputs("iostat: ", stderr);
if (errno)
perror(string);
else
fprintf(stderr, "%s\n", string);
exit(EXIT_FAILURE);
}
}
void get_number_of_cpus()
{
FILE *ncpufp = fopen("/proc/cpuinfo", "r");
handle_error("Can't open /proc/cpuinfo", !ncpufp);
while (fgets(buffer, sizeof(buffer), ncpufp)) {
if (!strncmp(buffer, "processor\t:", 11))
ncpu++;
}
fclose(ncpufp);
handle_error("Error parsing /proc/cpuinfo", !ncpu);
}
struct cpu_info cpu_stats()
{
double total;
struct cpu_info cpu;
setlinebuf(stdout);
get_number_of_cpus();
memset((void *)&old_cpu,0,sizeof(old_cpu));
memset((void *)&new_cpu,0,sizeof(new_cpu));
cpufp = fopen("/proc/stat", "r");
handle_error("Can't open /proc/stat", !cpufp);
rewind(cpufp);
while (fgets(buffer, sizeof(buffer), cpufp)) {
if (!strncmp(buffer, "cpu ", 4)) {
int items;
unsigned long long nice, irq, softirq;
items = sscanf(buffer,
"cpu %llu %llu %llu %llu %llu %llu %llu",
&new_cpu.user, &nice,
&new_cpu.system,
&new_cpu.idle,
&new_cpu.iowait,
&irq, &softirq);
new_cpu.user += nice;
if (items == 4)
new_cpu.iowait = 0;
if (items == 7)
new_cpu.system += irq + softirq;
}
}
cpu.user = new_cpu.user - old_cpu.user ;
cpu.system = new_cpu.system - old_cpu.system ;
cpu.idle = new_cpu.idle - old_cpu.idle ;
cpu.iowait = new_cpu.iowait - old_cpu.iowait ;
total = (cpu.user + cpu.system + cpu.idle + cpu.iowait) / 100.0;
printf("%f %f ", cpu.user /total , cpu.system /total);
printf("%f ", cpu.iowait /total);
printf("%f \n ", cpu.idle/total );
return(cpu);
}
int main(void){
cpu_stats();
}
--
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