statvfs (3)

#include <sys/statvfs.h>

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

int fstatvfs(int fd, struct statvfs *buf);

The function statvfs() returns information about a mounted filesystem. path is the pathname of any file within the mounted filesystem. buf is a pointer to a statvfs structure defined approximately as follows:

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 */
};

Here the types fsblkcnt_t and fsfilcnt_t are defined in <sys/types.h>. Both used to be unsigned long.

The field f_flag is a bit mask (of mount flags, see mount(8)). Bits defined by POSIX are

ST_RDONLY

Read-only filesystem.

ST_NOSUID

Set-user-ID/set-group-ID bits are ignored by exec(3).

It is unspecified whether all members of the returned struct have meaningful values on all filesystems.

fstatvfs() returns the same information about an open file referenced by descriptor fd.

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

EACCES

(statvfs()) Search permission is denied for a component of the path prefix of path. (See also path_resolution(7).)

EBADF

(fstatvfs()) fd is not a valid open file descriptor.

EFAULT

Buf or path points to an invalid address.

EINTR

This call was interrupted by a signal.

EIO

An I/O error occurred while reading from the filesystem.

ELOOP

(statvfs()) Too many symbolic links were encountered in translating path.

ENAMETOOLONG

(statvfs()) path is too long.

ENOENT

(statvfs()) The file referred to by path does not exist.

ENOMEM

Insufficient kernel memory was available.

ENOSYS

The filesystem does not support this call.

ENOTDIR

(statvfs()) A component of the path prefix of path is not a directory.

EOVERFLOW

Some values were too large to be represented in the returned struct.

Multithreading (see pthreads(7))

The statvfs() and fstatvfs() functions are thread-safe.

POSIX.1-2001.

The Linux kernel has system calls statfs(2) and fstatfs(2) to support this library call.

The current glibc implementations of

   pathconf(path, _PC_REC_XFER_ALIGN);
   pathconf(path, _PC_ALLOC_SIZE_MIN);
   pathconf(path, _PC_REC_MIN_XFER_SIZE);

respectively use the f_frsize, f_frsize, and f_bsize fields of the return value of statvfs(path,buf).

statfs(2)

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