cpu使用率和内存使用率

#include <stdio.h> #include <stdlib.h> #include <ctype.h> #include <string.h> #include <fcntl.h> #include <unistd.h>#include <sys/stat.h>#include <sys/types.h>#include <sys/time.h>static char buffer[1024];              static char cpu_name[10];             typedef struct {long cpu_user;long cpu_nice;long cpu_sys;long cpu_idle;    long cpu_iowait;long cpu_irq;long cpu_softirq; long cpu_all;}CPU_STAT_S;static CPU_STAT_S old;char *get_cpu_name(char *data, char *name){   while(!(*data == ' ' ||*data == '\0'))   {      *name++ = *data++;   }   *name++ = '\0';   return data;}//读取/proc/stat文件内容CPU_STAT_S get_cpu_data(void){    int fp = 0;    int len = 0;    char *p;    CPU_STAT_S cpu_stat;      fp = open("/proc/stat", O_RDONLY);    len = read(fp, buffer,sizeof(buffer)-1);    close(fp);    buffer[len] = '\0';    memset(&cpu_stat, 0, sizeof(CPU_STAT_S));      p = get_cpu_name(buffer, cpu_name);    cpu_stat.cpu_user = strtoul(p, &p, 0);    cpu_stat.cpu_nice = strtoul(p, &p, 0);    cpu_stat.cpu_sys = strtoul(p, &p, 0);    cpu_stat.cpu_idle = strtoul(p, &p, 0);    cpu_stat.cpu_iowait = strtoul(p, &p, 0);    cpu_stat.cpu_irq = strtoul(p, &p, 0);    cpu_stat.cpu_softirq = strtoul(p, &p, 0);    cpu_stat.cpu_all = cpu_stat.cpu_user + cpu_stat.cpu_nice + cpu_stat.cpu_sys \         + cpu_stat.cpu_idle + cpu_stat.cpu_iowait + cpu_stat.cpu_irq \                        + cpu_stat.cpu_softirq;        return cpu_stat;}//计算CPU使用率float get_cpu_stat(void){        float usage = 0.0;        float child_usage = 0.0;        float father_usage = 0.0;        CPU_STAT_S cur;        memset(&cur, 0, sizeof(CPU_STAT_S));        cur= get_cpu_data();        child_usage=(cur.cpu_idle - old.cpu_idle);        father_usage=(cur.cpu_all-old.cpu_all);        usage = 100-child_usage/father_usage*100;        old=cur;        return usage;}///////////////////////////////////////////////////////////////////////typedef struct meminfo meminfo;struct meminfo{    long total;    long free;    long buffers;    long cached;};//先读取/proc/meminfo文件，然后计算内存使用率float get_mem_stat(){    FILE *fp = 0;    char buf[100];    char str[100];    float free;    float total;    float usage = 0.0;    meminfo mem;    double lv;    if ((fp = fopen ("/proc/meminfo", "r")) == NULL)    {         printf("File open error!\n");         exit (1);    }    long data;    fgets(buf,100,fp);    sscanf(buf,"%*s%ld",&mem.total);    fgets(buf,100,fp);    sscanf(buf,"%*s%ld",&mem.free);    fgets(buf,100,fp);    sscanf(buf,"%*s%ld",&mem.buffers);    fgets(buf,100,fp);    sscanf(buf,"%*s%ld",&mem.cached);    fclose(fp);    //如果Cached值大于MemTotal值则空闲内存为MemFree值，否则空闲内存为MemFree值+Buffers值+Cached值    total=mem.total;    if(mem.cached>mem.total)    {           free=mem.free;    }    else    {           free=mem.free+mem.buffers+mem.cached;    }    usage=(free)/total*100;    return usage;}/////////////////////////////////////////////////////////////////////////1S中打印一次int main(void){        printf("start while! \n");     old= get_cpu_data();    while(1)    {        usleep(1000*1000);        printf("cpu:%.2f ,  mem:%.2f\n",get_cpu_stat(),get_mem_stat());    }     return 0;}

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