计算linux和openwrt的cpu使用率
#include <stdio.h>
#include <stdlib.h>
float get_cpu_util(void);
int main()
{
 float p = get_cpu_util();
 printf("p-->%.1f",p);
 return 0;
}
 
float get_cpu_util(void)
{
 FILE *fp;
 char buffer[128],name[15];
 long user1, nice1, system1, idle1,user2, nice2, system2, idle2,sum1,sum2;
 float util;
 
 if( (fp=fopen("/proc/stat","r") )==NULL)
 {
  printf("Can not open file!");
  exit(1);
 }
 
 fgets (buffer, sizeof(buffer),fp);
 sscanf (buffer, "%s  %ld  %ld  %ld  %ld", name, &user1,&nice1,&system1, &idle1);
 printf ("%s  %ld  %ld  %ld  %ld\n ", name, user1, nice1, system1, idle1);
 sum1=user1+ nice1+system1+idle1;
 fclose(fp);
 
 sleep(1);
 
 if( (fp=fopen("/proc/stat","r") )==NULL)
 {
  printf("Can not open file!");
  exit(1);
 }
 
 fgets (buffer, sizeof(buffer),fp);
fopen和open区别 sscanf (buffer, "%s  %ld  %ld  %ld  %ld", name, &user2,&nice2,&system2, &idle2);
 printf ("%s  %ld  %ld  %ld  %ld\n ", name, user2, nice2, system2, idle2);
 sum2=user2+ nice2+system2+idle2;
 util=(float)100.0*(user2-user1+system2-system1)/(sum2-sum1);
 printf("Cpu Utilization:%.1f  %%\n",util);
 fclose(fp);
 
 return util;
}

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