Linux CPU使用率获取 C
#include <stdio.h>
#include <unistd.h>
#include <string.h>
typedef struct CPU_PACKED
{
char name[20];
unsigned int user;
unsigned int nice;
unsigned int system;
unsigned int idle;
}CPU_OCCUPY;
int cal_cpuoccupy(CPU_OCCUPY *o, CPU_OCCUPY *n)
{
unsigned long od, nd;
unsigned long id, sd;
int cpu_use = 0;
od = (unsigned long)(o->user + o->nice + o->system + o->idle);
nd = (unsigned long)(n->user + n->nice + n->system + n->idle);
id = (unsigned long)(n->user - o->user);
sd = (unsigned long)(n->system - o->system);
if(nd-od !=0)
{
cpu_use = (int)((sd+id)*100)/(nd-od);
}
else
{
cpu_use = 0;
}
return cpu_use;
}
void get_cpuoccupy(CPU_OCCUPY *cpust)
{
FILE *fd;
int n;
char buf[256];
CPU_OCCUPY *cpu_occupy;
cpu_occupy = cpust;
fd = fopen("/proc/stat", "r");
fgets(buf, sizeof(buf), fd);
//memset(cpu_occupy->name,0,sizeof(cpu_occupy->name));
//cpu_occupy->user=0;
//cpu_occupy->nice=0;
//cpu_occupy->system=0;
//cpu_occupy->idle=0;
sscanf(buf, "%s %u %u %u %u", cpu_occupy->name, &cpu_occupy->user, &cpu_occupy->nice, &cpu_occupy->system, &cpu_occupy->idle);
fclose(fd);
}
int display_progress(int progress, int last_char_count)
{
int i = 0;
/*把上次显示的进度条信息全部清空*/
for (i = 0; i < last_char_count; i++)
{
//printf("");
}
printf("CPU Usage:[");
/*此处输出‘=’,也可以是其他字符,仅个人喜好*/
for (i = 0; i < progress; i++)
{
printf("#");
}
//printf(">>");
/*输出空格截止到第104的位置,仅个人审美*/
for (i += 2; i < 104; i++)
{
printf(" ");
}
/*输出进度条百分比*/
i = i + printf("%-3d%%]", progress);
/*此处不能少,需要刷新输出缓冲区才能显示,
* 这是系统的输出策略*/
fflush(stdout);
printf("
");
/*返回本次显示进度条时所输出的字符个数*/
return i;
}
int main()
{
CPU_OCCUPY cpu_stat1, cpu_stat2;
int cpu;
int ret;
while(1)
{
cpu=0;
get_cpuoccupy((CPU_OCCUPY*)&cpu_stat1);
//printf("%s,%u,%u,%u,%u
",cpu_stat1.name,cpu_stat1.user,cpu_stat1.nice,cpu_stat1.system,cpu_stat1.idle);
sleep(1);
get_cpuoccupy((CPU_OCCUPY*)&cpu_stat2);
//printf("%s,%u,%u,%u,%u
",cpu_stat2.name,cpu_stat2.user,cpu_stat2.nice,cpu_stat2.system,cpu_stat2.idle);
cpu = cal_cpuoccupy((CPU_OCCUPY *)&cpu_stat1, (CPU_OCCUPY *)&cpu_stat2);
ret = display_progress(cpu, ret);
}
return 0;
}