获取cpu一些信息的例子

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

char* cpu(void)
{
unsigned int total;

float user;
float nice;
float system;
float idle;

char cpu[21];
char text[201];

FILE *fp;

fp = fopen("/proc/stat", "r");
while (fgets(text, 200, fp))
{
if (strstr(text, "cpu"))
{
sscanf(text, "%s %f %f %f %f", cpu, &user, &nice, &system, &idle);
}
}
fclose(fp);

total = (user + nice + system + idle);
user = (user / total) * 100;
nice = (nice / total) * 100;
system = (system / total) * 100;
idle = (idle / total) * 100;

snprintf(cpu, 21, "%4.2f %4.2f %3.2f %4.2f", user, nice, system, idle);
printf("cpu detail is:\n%s\n",cpu);
return(cpu);
}
int main(int argc,char **argv)
{
//char cpu_detail[200];
while(1)
{
cpu();
sleep(2);
}
}