statvfs(2) statvfs(2)
NAME
statvfs, fstatvfs - get file system information
SYNOPSIS
#include <sys/types.h>
#include <sys/statvfs.h>
int statvfs(const char *path, struct statvfs *buf);
int fstatvfs(int fildes, struct statvfs *buf);
DESCRIPTION
statvfs returns a ``generic superblock'' describing a file
system; it can be used to acquire information about mounted
file systems. buf is a pointer to a structure (described
below) that is filled by the system call.
path should name a file that resides on that file system. The
file system type is known to the operating system. Read,
write, or execute permission for the named file is not
required, but all directories listed in the pathname leading
to the file must be searchable.
The statvfs structure pointed to by buf includes the following
members:
ulong f_bsize; /* preferred file system block size */
ulong f_frsize; /* fundamental filesystem block size
(if supported) */
ulong f_blocks; /* total # of blocks on file system
in units of f_frsize */
ulong f_bfree; /* total # of free blocks */
ulong f_bavail; /* # of free blocks avail to
non-superuser */
ulong f_files; /* total # of file nodes (inodes) */
ulong f_ffree; /* total # of free file nodes */
ulong f_favail; /* # of inodes avail to
non-superuser*/
fsid_t f_fsid; /* file system id (dev for now) */
char f_basetype[FSTYPSZ]; /* target fs type name,
null-terminated */
ulong f_flag; /* bit mask of flags */
ulong f_namemax; /* maximum file name length */
char f_fstr[32]; /* file system specific string */
ulong f_filler[16]; /* reserved for future expansion */
Copyright 1994 Novell, Inc. Page 1
statvfs(2) statvfs(2)
f_basetype contains a null-terminated FSType name of the
mounted target (for example, s5 mounted over NFS will contain
nfs).
The following flags can be returned in the f_flag field:
ST_RDONLY 0x01 /* read-only file system */
ST_NOSUID 0x02 /* does not support setuid/setgid
semantics */
ST_NOTRUNC 0x04 /* does not truncate file names
longer than {NAME_MAX}*/
fstatvfs is similar to statvfs, except that the file named by
path in statvfs is instead identified by an open file
descriptor fildes obtained from a successful open, creat, dup,
fcntl, or pipe system call.
Return Values
On success, statvfs and fstatvfs return 0. On failure,
statvfs and fstatvfs return -1 and set errno to identify the
error.
Errors
In the following conditions, statvfs fails and sets errno to:
EACCES Search permission is denied on a component of
the path prefix.
EFAULT path or buf points outside the process's
allocated address space.
EINTR A signal was caught during statvfs execution.
EIO An I/O error occurred while reading the file
system.
ELOOP Too many symbolic links were encountered in
translating path.
EMULTIHOP Components of path require hopping to multiple
remote machines and file system type does not
allow it.
ENAMETOOLONG The length of a path component exceeds
{NAME_MAX} characters, or the length of path
exceeds {PATH_MAX} characters.
Copyright 1994 Novell, Inc. Page 2
statvfs(2) statvfs(2)
ENOENT Either a component of the path prefix or the
file referred to by path does not exist.
ENOLINK path points to a remote machine and the link to
that machine is no longer active.
ENOTDIR A component of the path prefix of path is not a
directory.
In the following conditions, fstatvfs fails and sets errno to:
EFAULT buf points to an invalid address.
EBADF fildes is not an open file descriptor.
EINTR A signal was caught during fstatvfs execution.
EIO An I/O error occurred while reading the file
system.
REFERENCES
chmod(2), chown(2), creat(2), link(2), mknod(2), pipe(2),
read(2), time(2), unlink(2), utime(2), write(2)
Copyright 1994 Novell, Inc. Page 3