Linux CPU使用率获取 c
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("\b"); } 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("\r"); /*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\n",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\n",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; }
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