C Linux 检查挂载空间

Question

当我运行 df -h 时，我可以在 /dev 中看到我使用 6M，大小为 40M，可用大小为 34M。

如何使用 C 代码获取此信息？

Answer 1

来自 here :

使用statvfs API:

// header for statvfs
#include <sys/statvfs.h>

statvfs的原型(prototype)是

int statvfs(const char *path, struct statvfs *buf);

结果将填充到 buf statvfs 结构中:

struct statvfs {
    unsigned long  f_bsize;    /* filesystem block size */
    unsigned long  f_frsize;   /* fragment size */
    fsblkcnt_t     f_blocks;   /* size of fs in f_frsize units */
    fsblkcnt_t     f_bfree;    /* # free blocks */
    fsblkcnt_t     f_bavail;   /* # free blocks for unprivileged users */
    fsfilcnt_t     f_files;    /* # inodes */
    fsfilcnt_t     f_ffree;    /* # free inodes */
    fsfilcnt_t     f_favail;   /* # free inodes for unprivileged users */
    unsigned long  f_fsid;     /* filesystem ID */
    unsigned long  f_flag;     /* mount flags */
    unsigned long  f_namemax;  /* maximum filename length */
};

返回类型是:

On success, zero is returned. On error, -1 is returned, and errno is set appropriately.

另请查看 man3 statvfs 命令的联机帮助页以获取更多详细信息。