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.\" Copyright (C) 2003 Andries Brouwer (aeb@cwi.nl)
.\"
.\" Permission is granted to make and distribute verbatim copies of this
.\" manual provided the copyright notice and this permission notice are
.\" preserved on all copies.
.\"
.\" Permission is granted to copy and distribute modified versions of this
.\" manual under the conditions for verbatim copying, provided that the
.\" entire resulting derived work is distributed under the terms of a
.\" permission notice identical to this one.
.\"
.\" Since the Linux kernel and libraries are constantly changing, this
.\" manual page may be incorrect or out-of-date. The author(s) assume no
.\" responsibility for errors or omissions, or for damages resulting from
.\" the use of the information contained herein. The author(s) may not
.\" have taken the same level of care in the production of this manual,
.\" which is licensed free of charge, as they might when working
.\" professionally.
.\"
.\" Formatted or processed versions of this manual, if unaccompanied by
.\" the source, must acknowledge the copyright and authors of this work.
.\"
.\" The pathconf note is from Walter Harms
.\" This is not a system call on Linux
.\"
.\" Modified 2004-06-23 by Michael Kerrisk <mtk-manpages@gmx.net>
.\"
.TH STATVFS 2 2003-08-22 "Linux 2.6.0" "Linux Programmer's Manual"
.SH NAME
statvfs, fstatvfs \- get file system statistics
.SH SYNOPSIS
.B #include <sys/statvfs.h>
.sp
.BI "int statvfs(const char *" path ", struct statvfs *" buf );
.br
.BI "int fstatvfs(int " fd ", struct statvfs *" buf );
.SH DESCRIPTION
The function
.BR statvfs ()
returns information about a mounted file system.
.I path
is the pathname of any file within the mounted filesystem.
.I buf
is a pointer to a
.I statvfs
structure defined approximately as follows:
.nf
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 non-root */
fsfilcnt_t f_files; /* # inodes */
fsfilcnt_t f_ffree; /* # free inodes */
fsfilcnt_t f_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 */
};
.fi
Here the types
.B fsblkcnt_t
and
.B fsfilcnt_t
are defined in
.IR <sys/types.h> .
Both used to be
.IR "unsigned long" .
The field
.I f_flag
is a bit mask (of mount flags, see
.BR mount (8)).
Bits defined by POSIX are
.TP
.B ST_RDONLY
Read-only file system.
.TP
.B ST_NOSUID
Set-user-ID/set-group-ID bits are ignored by
.BR exec (2).
.LP
It is unspecified whether all members of the returned struct
have meaningful values on all filesystems.
.BR fstatvfs ()
returns the same information about an open file referenced by descriptor
.IR fd .
.SH "RETURN VALUE"
On success, zero is returned.
On error, \-1 is returned, and
.I errno
is set appropriately.
.SH ERRORS
.TP
.B EACCES
.RB ( statvfs ())
Search permission is denied for a component of the path prefix of
.IR path .
(See also
.BR path_resolution (7).)
.TP
.B EBADF
.RB ( fstatvfs ())
.I fd
is not a valid open file descriptor.
.TP
.B EFAULT
.I Buf
or
.I path
points to an invalid address.
.TP
.B EINTR
This call was interrupted by a signal.
.TP
.B EIO
An I/O error occurred while reading from the file system.
.TP
.B ELOOP
.RB ( statvfs ())
Too many symbolic links were encountered in translating
.IR path .
.TP
.B ENAMETOOLONG
.RB ( statvfs ())
.I path
is too long.
.TP
.B ENOENT
.RB ( statvfs ())
The file referred to by
.I path
does not exist.
.TP
.B ENOMEM
Insufficient kernel memory was available.
.TP
.B ENOSYS
The file system does not support this call.
.TP
.B ENOTDIR
.RB ( statvfs ())
A component of the path prefix of
.I path
is not a directory.
.TP
.B EOVERFLOW
Some values were too large to be represented in the returned struct.
.SH "CONFORMING TO"
POSIX.1-2001
.SH NOTES
The Linux kernel has system calls
.BR statfs (2)
and
.BR fstatfs (2)
to support this library call.
The current glibc implementations of
.sp
.nf
pathconf(path, _PC_REC_XFER_ALIGN);
pathconf(path, _PC_ALLOC_SIZE_MIN);
pathconf(path, _PC_REC_MIN_XFER_SIZE);
.fi
.sp
respectively use the
.IR f_frsize ,
.IR f_frsize ,
and
.IR f_bsize
fields of the return value of
.IR "statvfs(path,buf)" .
.SH "SEE ALSO"
.BR statfs (2)
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