//
// Created by Iain on 2021/7/17.
//

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

#define BUFFER_SIZE_MEMINFO 128
#define SYSTEM_MEM_INFO_PATH "/proc/meminfo"

void updateSystemMem(unsigned int *all, unsigned int *fre, float *useage) {
    char buf[BUFFER_SIZE_MEMINFO];  /*缓冲区*/
    FILE *fp;               /*文件指针*/
    if ((fp = fopen(SYSTEM_MEM_INFO_PATH, "r")) == NULL) {
        perror("fail to read /proc/meminfo");
        return;
    }
    fgets(buf, BUFFER_SIZE_MEMINFO, fp);
    sscanf(buf, "MemTotal: %u kB", all);
    fgets(buf, BUFFER_SIZE_MEMINFO, fp);
    sscanf(buf, "MemFree %u kB", fre);
    *useage = 1 - (float) *fre / *all;
}