在嵌入式系统中,由于flash存储空间有限,或者是存储数据,实现数据的循环删除,需要获取到分区的使用情况,可以通过系统下的函数statfs来获取使用情况;实现代码如下:
flashInfo.cpp
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/vfs.h>
typedef unsigned long long u64;
//unit: 0-MBytes, 1-KBytes, default MBytes
int getPartitionUse(const char *dir, size_t &totleSize, size_t &freeSize, int unit)
{
struct statfs diskInfo;
int ret = statfs(dir, &diskInfo);
if ( ret != 0 )
{
perror("getPartitionUse statfs error ");
return ret;
}
u64 allBlocks = diskInfo.f_bsize;
u64 tmpTotalSize = allBlocks * diskInfo.f_blocks;
u64 tmpFreeDisk = diskInfo.f_bfree*allBlocks;
totleSize = tmpTotalSize>>20;
freeSize = tmpFreeDisk>>20;
if(unit == 0)
{
totleSize = tmpTotalSize>>20;
freeSize = tmpFreeDisk>>20;
}
else if( unit == 1 )
{
totleSize = tmpTotalSize>>10;
freeSize = tmpFreeDisk>>10;
}
return 0;
}
int main()
{
size_t totleSize = 0;
size_t freeSize = 0;
getPartitionUse("/", totleSize,freeSize, 0);
printf ("system total=%dMB, free=%dMB
", totleSize, freeSize);
getPartitionUse("/work/data", totleSize,freeSize, 0);
printf ("data total=%dMB, free=%dMB
", totleSize, freeSize);
getPartitionUse("/work", totleSize,freeSize, 0);
printf ("config total=%dMB, free=%dMB
", totleSize, freeSize);
}
编译:
mipsel-linux-g++ flashInfo.c -o flashInfo
运行结果如下:
这样可以在界面或者内置web上用进度条的形式显示出来,比较直观。
个人微信订阅号: