STATVFS(2)

NAME
statvfs, statvfs1, fstatvfs, fstatvfs1 - get file system statistics

LIBRARY
libc

SYNOPSIS
#include <sys/statvfs.h>
int
statvfs(const char *path, struct statvfs *buf);
int
statvfs1(const char *path, struct statvfs *buf, int flags);
int
fstatvfs(int fd, struct statvfs *buf);
int
fstatvfs1(int fd, struct statvfs *buf, int flags);

DESCRIPTION
statvfs() and statvfs1() return information about a mounted file system. path is the path name of any file within the mounted file system. buf is a pointer to a statvfs structure defined in statvfs(5).

fstatvfs() and fstatvfs1() return the same information about an open file referenced by descriptor fd.

The statvfs1() and fstatvfs1() functions allow an extra flags argument which can be ST_WAIT and ST_NOWAIT. When ST_NOWAIT is specified, then only cached statistics are returned. This can result in significant savings on non-local file systems, where gathering statistics involves a network communication.

The statvfs() and fstatvfs() calls are equivalent to the respective statvfs1() and fstatvfs1() calls with ST_WAIT specified as the flags argument.

RETURN VALUES
Upon successful completion, a value of 0 is returned. Otherwise, -1 is returned and the global variable errno is set to indicate the error.

ERRORS
statvfs() and statvfs1() fail if one or more of the following are true:

[ENOTDIR]
    A component of the path prefix of path is not a directory.

[ENAMETOOLONG]
    The length of a component of path exceeds {NAME_MAX} characters, or the length of path exceeds {PATH_MAX} characters.

[ENOENT]
    The file referred to by path does not exist.

[EACCES]
    Search permission is denied for a component of the path prefix of path.

[ELOOP]
    Too many symbolic links were encountered in translating path.

[EFAULT]
    buf or path points to an invalid address.

[EIO]
    An I/O error occurred while reading from or writing to the file system.

fstatvfs() and fstatvfs1() fail if one or more of the following are true:

[EBADF]
    fd is not a valid open file descriptor.

[EFAULT]
    buf points to an invalid address.

[EIO]
    An I/O error occurred while reading from or writing to the file system.

SEE ALSO
statvfs(5)

HISTORY
The statvfs(), statvfs1(), fstatvfs(), and fstatvfs1() functions first appeared in NetBSD 3.0 to replace the statfs() family of functions which first appeared in 4.4BSD.