STATFS(2) System Calls Manual STATFS(2)
NAME
statfs, fstatfs - get file system statistics
SYNOPSIS
#include <sys/param.h>
#include <sys/mount.h>
int
statfs(path,buf)
char *path;
struct statfs *buf;
int
fstatfs(fd,buf)
int fd;
struct statfs *buf;
DESCRIPTION
Statfs() returns information about a mounted file system. Path is the path name of any file within the mounted filesystem. Buf is a
pointer to a statfs structure defined as follows:
#define MNAMELEN 90 /* length of buffer for returned name */
struct statfs {
short f_type; /* type of filesystem (see below) */
short f_flags; /* copy of mount flags */
short f_bsize; /* fundamental file system block size */
short f_iosize; /* optimal transfer block size */
long f_blocks; /* total data blocks in file system */
long f_bfree; /* free blocks in fs */
long f_bavail; /* free blocks avail to non-superuser */
ino_t f_files; /* total file nodes in file system */
ino_t f_ffree; /* free file nodes in fs */
u_long f_fsid[2]; /* file system id */
long f_spare[4]; /* spare for later */
char f_mntonname[MNAMELEN]; /* mount point */
char f_mntfromname[MNAMELEN]; /* mounted filesystem */
};
/*
* File system types. - Only UFS is supported so the other types are not
* given.
*/
#define MOUNT_UFS 1 /* Fast Filesystem */
Fields that are undefined for a particular file system are set to -1. Fstatfs() returns the same information about an open file referenced
by descriptor fd.
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
Statfs() fails if one or more of the following are true:
[ENOTDIR] A component of the path prefix of Path is not a directory.
[EINVAL] path contains a character with the high-order bit set.
[ENAMETOOLONG] The length of a component of path exceeds 63 characters, or the length of path exceeds 255 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.
Fstatfs() fails 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.
HISTORY
The statfs function first appeared in 4.4BSD.
4.4 Berkeley Distribution December 26, 1995 STATFS(2)