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STATVFS (2) | System calls | Unix Manual Pages | :man

NAME

statvfs, fstatvfs - get file system statistics

CONTENTS

Synopsis
Description
Errors
Notes

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 path name 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; /* file system block size */
unsigned long f_frsize; /* fragment size */
fsblkcnt_tf_blocks; /* size of fs in f_frsize units */
fsblkcnt_tf_bfree; /* # free blocks */
fsblkcnt_tf_bavail; /* # free blocks for non-root */
fsfilcnt_tf_files; /* # inodes */
fsfilcnt_tf_ffree; /* # free inodes */
fsfilcnt_tf_favail; /* # free inodes for non-root */
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
Setuid/setgid bits are ignored by exec(2).

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.

"RETURN VALUE"

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

ERRORS

EBADF (fstatvfs) fd is not a valid open file descriptor.
EACCES (statvfs) Search permission is denied for a component of the path prefix of path.
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.
ENOTDIR
(statvfs) A component of the path prefix of path is not a directory.
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.
ENOMEM Insufficient kernel memory was available.
ENOSYS The file system does not support this call.
EOVERFLOW
Some values were too large to be represented in the returned struct.

"CONFORMING TO"

Solaris, Irix, POSIX 1003.1-2001

NOTES

The Linux kernel has system calls statfs, fstatfs to support this library call.

The current glibc implementation of


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

uses the f_frsize, f_frsize, and f_bsize fields of the return value of "statvfs(path,buf)".

"SEE ALSO"

statfs(2)


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