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\n", totleSize, freeSize); getPartitionUse("/work/data", totleSize,freeSize, 0); printf ("data total=%dMB, free=%dMB\n", totleSize, freeSize); getPartitionUse("/work", totleSize,freeSize, 0); printf ("config total=%dMB, free=%dMB\n", 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。
