说明:文章代码整理自网上资料。
1. 获取cpu使用率
#include <stdio.h>
#include <unistd.h>
/* cpu_info_t结构体存放cpu相关信息 */
typedef struct _cpu_info
{
char name[20];
unsigned int user;
unsigned int nice;
unsigned int system;
unsigned int idle;
unsigned int iowait;
unsigned int irq;
unsigned int softirq;
}cpu_info_t;
/* 从/proc/stat文件中获取cpu的相关信息 */
void get_cpu_occupy(cpu_info_t* info)
{
FILE* fp = NULL;
char buf[256] = {0};
fp = fopen("/proc/stat", "r");
fgets(buf, sizeof(buf), fp);
sscanf(buf, "%s %u %u %u %u %u %u %u", info->name, &info->user, &info->nice,
&info->system, &info->idle, &info->iowait, &info->irq, &info->softirq);
fclose(fp);
}
/* 计算cpu的使用率 */
double calc_cpu_rate(cpu_info_t* old_info, cpu_info_t* new_info)
{
double od, nd;
double usr_dif, sys_dif, nice_dif;
double user_cpu_rate;
double kernel_cpu_rate;
od = (double)(old_info->user + old_info->nice + old_info->system + old_info->idle + old_info->iowait + old_info->irq + old_info->softirq);
nd = (double)(new_info->user + new_info->nice + new_info->system + new_info->idle + new_info->iowait + new_info->irq + new_info->softirq);
if (nd - od)
{
user_cpu_rate = (new_info->user - old_info->user) / (nd - od) * 100;
kernel_cpu_rate = (new_info->system - old_info->system) / (nd - od) * 100;
return user_cpu_rate + kernel_cpu_rate;
}
return 0;
}
int main(void)
{
cpu_info_t info1;
cpu_info_t info2;
get_cpu_occupy(&info1);
sleep(2); /* 休息2s以统计cpu使用率 */
get_cpu_occupy(&info2);
printf("CPU的使用率: %.2lf%\n", calc_cpu_rate(&info1, &info2));
return 0;
}
2. 获取内存使用率
#include <stdio.h>
typedef struct _mem_info_t
{
char name[20];
unsigned long total;
char name2[20];
}mem_info_t;
void get_memory_occupy()
{
FILE* fp = NULL;
char buf[256] = {0};
mem_info_t info;
double mem_total, mem_used_rate;
fp = fopen("/proc/meminfo", "r");
fgets(buf, sizeof(buf), fp);
sscanf(buf, "%s %lu %s\n", info.name, &info.total, &info.name2);
mem_total = info.total;
fgets(buf, sizeof(buf), fp);
sscanf(buf, "%s %lu %s\n", info.name, &info.total, &info.name2);
mem_used_rate = (1 - info.total / mem_total) * 100;
mem_total = mem_total / (1024 * 1024); //KB -> GB
printf("内存大小为: %.0lfG, 占用率为: %.2lf\n", mem_total, mem_used_rate);
}
int main(void)
{
get_memory_occupy();
return 0;
}
3. 获取磁盘使用率
#include <stdio.h>
void get_hard_drive_rate()
{
FILE* fp = NULL;
int h = 0;
char buf[80], a[80], d[80], e[80], f[80];
double b, c;
double total = 0, used = 0;
fp = popen("df", "r");
fgets(buf, 256, fp);
while (6 == fscanf(fp, "%s %lf %lf %s %s %s", a, &b, &c, d, e, f))
{
total += b;
used += c;
}
pclose(fp);
printf("磁盘总大小: %.4lfG, 使用率: %.2lf%\n", total / (1024 * 1024), used / total * 100);
}
int main(void)
{
get_hard_drive_rate();
return 0;
}