前两天工作有需求,需要查询一个路径的总空间大小和可用空间大小,结果就查到了这个函数,测试程序如下:
test.c
#include <sys/statfs.h> #include <stdio.h> int main() { struct statfs diskInfo; statfs("/home/carl/", &diskInfo); unsigned long long blocksize = diskInfo.f_bsize; //每个block里包含的字节数 unsigned long long totalsize = blocksize * diskInfo.f_blocks; //总的字节数,f_blocks为block的数目 printf("Total_size = %llu B = %llu KB = %llu MB = %llu GB\n", totalsize, totalsize>>10, totalsize>>20, totalsize>>30); unsigned long long freeDisk = diskInfo.f_bfree * blocksize; //剩余空间的大小 unsigned long long availableDisk = diskInfo.f_bavail * blocksize; //可用空间大小 printf("Disk_free = %llu MB = %llu GB\nDisk_available = %llu MB = %llu GB\n", freeDisk>>20, freeDisk>>30, availableDisk>>20, availableDisk>>30); return 0; }
编译过程,运行结果,与df命令对比结果如下:
carl@carl-VirtualBox:~/share$ gcc test.c -o test_statfs carl@carl-VirtualBox:~/share$ ./test_statfs Total_size = 20332810240 B = 19856260 KB = 19390 MB = 18 GB Disk_free = 15492 MB = 15 GB Disk_available = 14519 MB = 14 GB carl@carl-VirtualBox:~/share$ df /home/carl -h Filesystem Size Used Avail Use% Mounted on /dev/sda1 19G 3.9G 15G 22% / carl@carl-VirtualBox:~/share$
好像有点误差。
水平有限,如果有朋友发现错误,欢迎留言交流。
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