.\" Copyright (c) 1989, 1991, 1993
.\" The Regents of the University of California. All rights reserved.
.\" %sccs.include.redist.roff%
.\" @(#)statfs.2 8.3 (Berkeley) %G%
.Nd get file system statistics
.Fd #include <sys/param.h>
.Fd #include <sys/mount.h>
.Fn statfs "const char *path" "struct statfs *buf"
.Fn fstatfs "int fd" "struct statfs *buf"
returns information about a mounted file system.
is the path name of any file within the mounted filesystem.
structure defined as follows:
#define MNAMELEN 90 /* length of buffer for returned name */
short f_type; /* type of filesystem (see below) */
short f_flags; /* copy of mount flags */
long f_bsize; /* fundamental file system block size */
long 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 */
long f_files; /* total file nodes in file system */
long f_ffree; /* free file nodes in fs */
fsid_t f_fsid; /* file system id */
long f_spare[9]; /* spare for later */
char f_mntonname[MNAMELEN]; /* mount point */
char f_mntfromname[MNAMELEN]; /* mounted filesystem */
#define MOUNT_UFS 1 /* Fast Filesystem */
#define MOUNT_NFS 2 /* Sun-compatible Network Filesystem */
#define MOUNT_MFS 3 /* Memory-based Filesystem */
#define MOUNT_MSDOS 4 /* MS/DOS Filesystem */
#define MOUNT_LFS 5 /* Log-based Filesystem */
#define MOUNT_LOFS 6 /* Loopback Filesystem */
#define MOUNT_FDESC 7 /* File Descriptor Filesystem */
#define MOUNT_PORTAL 8 /* Portal Filesystem */
#define MOUNT_NULL 9 /* Minimal Filesystem Layer */
#define MOUNT_UMAP 10 /* Uid/Gid Remapping Filesystem */
#define MOUNT_KERNFS 11 /* Kernel Information Filesystem */
#define MOUNT_PROCFS 12 /* /proc Filesystem */
#define MOUNT_AFS 13 /* Andrew Filesystem */
#define MOUNT_CD9660 14 /* ISO9660 (aka CDROM) Filesystem */
#define MOUNT_UNION 15 /* Union (translucent) Filesystem */
Fields that are undefined for a particular file system are set to -1.
returns the same information about an open file referenced by descriptor
Upon successful completion, a value of 0 is returned.
Otherwise, -1 is returned and the global variable
is set to indicate the error.
fails if one or more of the following are true:
.Bl -tag -width ENAMETOOLONGA
A component of the path prefix of
contains a character with the high-order bit set.
The length of a component of
Search permission is denied for a component of the path prefix of
Too many symbolic links were encountered in translating
points to an invalid address.
error occurred while reading from or writing to the file system.
fails if one or more of the following are true:
.Bl -tag -width ENAMETOOLONGA
is not a valid open file descriptor.
points to an invalid address.
error occurred while reading from or writing to the file system.
function first appeared in 4.4BSD.