statvfs, fstatvfs — get file system statistics
#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 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;unsigned long f_frsize;fsblkcnt_t f_blocks;fsblkcnt_t f_bfree;fsblkcnt_t f_bavail;fsfilcnt_t f_files;fsfilcnt_t f_ffree;fsfilcnt_t f_favail;unsigned long f_fsid;unsigned long f_flag;unsigned long f_namemax;};
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_RDONLYRead-only file system.
ST_NOSUIDSet-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.
On success, zero is returned. On error, −1 is
returned, and errno is set
appropriately.
(statvfs()) Search
permission is denied for a component of the path prefix
of path. (See
also path_resolution(7).)
(fstatvfs())
fd is not a
valid open file descriptor.
Buf or
path points to
an invalid address.
This call was interrupted by a signal.
An I/O error occurred while reading from the file system.
(statvfs()) Too many
symbolic links were encountered in translating
path.
(statvfs()) path is too long.
(statvfs()) The file
referred to by path does not exist.
Insufficient kernel memory was available.
The file system does not support this call.
(statvfs()) A
component of the path prefix of path is not a
directory.
Some values were too large to be represented in the returned struct.
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).
This page is part of release 3.25 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/.
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Copyright (C) 2003 Andries Brouwer (aebcwi.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.manpagesgmail.com> |