我想在Linux中获取磁盘使用情况,但是当我运行上述代码时,结果是错误的。
#include <stdio.h>
#include <sys/statvfs.h>
int main(int argc, const char *argv[])
{
const unsigned int GB = (1024 * 1024) * 1024;
struct statvfs buffer;
int ret = statvfs("/dev/sda4", &buffer);
if (!ret) {
const double total = (double)(buffer.f_blocks * buffer.f_frsize) / GB;
const double available = (double)(buffer.f_bfree * buffer.f_frsize) / GB;
const double used = total - available;
const double usedPercentage = (double)(used / total) * (double)100;
printf("Total: %f --> %.0f\n", total, total);
printf("Available: %f --> %.0f\n", available, available);
printf("Used: %f --> %.1f\n", used, used);
printf("Used Percentage: %f --> %.0f\n", usedPercentage, usedPercentage);
}
return ret;
}
输出结果为:
Total: 7.757446 --> 8
Available: 7.757446 --> 8
Used: 0.000000 --> 0.0
Used Percentage: 0.000000 --> 0
我在Linux终端中运行了df命令,输出结果如下:
Filesystem 1K-blocks Used Available Use% Mounted on
**/dev/sda4 471705824 13885152 433789596 4% /**
这两个结果彼此不同,是什么原因呢?
const double GB = 1024.0 * 1024 * 1024;
和100.0
进行修改,并移除所有不必要的强制类型转换。 - phuclv