NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | CONFORMING TO | NOTES | SEE ALSO | COLOPHON
STATVFS(2) Linux Programmer's Manual STATVFS(2)
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; /* 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 */
};
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.
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 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.
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)
This page is part of release 3.23 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/.
Linux 2003-08-22 STATVFS(2)