linux C代码获取磁盘大小

[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
", 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
", 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
", mbTotalsize, mbFreedisk);

执行输出如下：

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