Linux下读取磁盘硬盘容量大小的C代码实现，不用df -h命令

来源：互联网发布：js单选alery 编辑：程序博客网时间：2024/05/29 17:10

众所周知， df 命令显示磁盘的容量，但是我们需要用C代码来读取的时候，总不能使用shell脚本吧。所以下面给出了其实现，实现的结果和用df -h命令显示的基本一致

[root@localhost ~]# df -h
文件系统              容量已用可用已用% 挂载点
/dev/mapper/VolGroup00-LogVol00
                       14G   11G 2.5G 81% /
/dev/sda1          99M   21M   73M 23% /boot
tmpfs                 252M     0 252M   0% /dev/shm

如下为C代码的实现

#include <sys/vfs.h>

struct statfs diskInfo;statfs("/", &diskInfo);unsigned long long totalBlocks = diskInfo.f_bsize;unsigned long long totalSize = totalBlocks * diskInfo.f_blocks;size_t mbTotalsize = totalSize>>20;unsigned long long freeDisk = diskInfo.f_bfree*totalBlocks;size_t mbFreedisk = freeDisk>>20;printf ("/  total=%dMB, free=%dMB\n", mbTotalsize, mbFreedisk);statfs("/boot", &diskInfo);totalBlocks = diskInfo.f_bsize;totalSize = totalBlocks * diskInfo.f_blocks;mbTotalsize = totalSize>>20;freeDisk = diskInfo.f_bfree*totalBlocks;mbFreedisk = freeDisk>>20;printf ("/boot  total=%dMB, free=%dMB\n", mbTotalsize, mbFreedisk);statfs("/dev/shm", &diskInfo);totalBlocks = diskInfo.f_bsize;totalSize = totalBlocks * diskInfo.f_blocks;mbTotalsize = totalSize>>20;freeDisk = diskInfo.f_bfree*totalBlocks;mbFreedisk = freeDisk>>20;printf ("/dev/shm  total=%dMB, free=%dMB\n", mbTotalsize, mbFreedisk);

执行输出如下：

/ total=13763MB, free=3246MB
/boot total=98MB, free=78MB
/dev/shm total=251MB, free=251MB

希望对大家有用！