Name

statvfs, fstatvfs — get file system statistics

Synopsis

#include <sys/statvfs.h>
int statvfs( const char *path,
  struct statvfs *buf);
 
int fstatvfs( int fd,
  struct statvfs *buf);
 

DESCRIPTION

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

struct statvfs {
  unsigned long   f_bsize;
/* file system 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;
/* file system 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 file system.

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 file systems.

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

RETURN VALUE

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

ERRORS

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 file system.

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 file system 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.

CONFORMING TO

POSIX.1-2001.

NOTES

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).

SEE ALSO

statfs(2)

COLOPHON

This page is part of release 3.52 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at http://www.kernel.org/doc/man−pages/.


  Copyright (C) 2003 Andries Brouwer (aebcwi.nl)

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The pathconf note is from Walter Harms
This is not a system call on Linux

Modified 2004-06-23 by Michael Kerrisk <mtk.manpagesgmail.com>