.\" $NetBSD: statfs.2,v 1.14 1998/02/02 05:20:37 perry Exp $ .\" .\" Copyright (c) 1989, 1991, 1993 .\" The Regents of the University of California. All rights reserved. .\" .\" Redistribution and use in source and binary forms, with or without .\" modification, are permitted provided that the following conditions .\" are met: .\" 1. Redistributions of source code must retain the above copyright .\" notice, this list of conditions and the following disclaimer. .\" 2. Redistributions in binary form must reproduce the above copyright .\" notice, this list of conditions and the following disclaimer in the .\" documentation and/or other materials provided with the distribution. .\" 3. All advertising materials mentioning features or use of this software .\" must display the following acknowledgement: .\" This product includes software developed by the University of .\" California, Berkeley and its contributors. .\" 4. Neither the name of the University nor the names of its contributors .\" may be used to endorse or promote products derived from this software .\" without specific prior written permission. .\" .\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND .\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE .\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE .\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE .\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL .\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS .\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) .\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT .\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF .\" SUCH DAMAGE. .\" .\" @(#)statfs.2 8.5 (Berkeley) 5/24/95 .\" .Dd May 24, 1995 .Dt STATFS 2 .Os .Sh NAME .Nm statfs , .Nm fstatfs .Nd get file system statistics .Sh SYNOPSIS .Fd #include .Fd #include .Ft int .Fn statfs "const char *path" "struct statfs *buf" .Ft int .Fn fstatfs "int fd" "struct statfs *buf" .Sh DESCRIPTION .Fn Statfs returns information about a mounted file system. .Fa Path is the path name of any file within the mounted file system. .Fa Buf is a pointer to a .Nm statfs structure defined as follows: .Bd -literal typedef struct { int32_t val[2]; } fsid_t; #define MFSNAMELEN 16 /* length of fs type name, including nul */ #define MNAMELEN 32 /* length of buffer for returned name */ struct statfs { short f_type; /* type of file system (unused; zero) */ u_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 */ uid_t f_owner; /* user that mounted the file system */ long f_spare[4]; /* spare for later */ char f_fstypename[MFSNAMELEN]; /* fs type name */ char f_mntonname[MNAMELEN]; /* directory on which mounted */ char f_mntfromname[MNAMELEN]; /* mounted file system */ }; .Ed The flags that may be returned include: .Bl -tag -width MNT_ASYNCHRONOUS .It Dv MNT_RDONLY The filesystem is mounted read-only; Even the super-user may not write on it. .It Dv MNT_NOEXEC Files may not be executed from the filesystem. .It Dv MNT_NOSUID Setuid and setgid bits on files are not honored when they are executed. .It Dv MNT_NODEV Special files in the filesystem may not be opened. .It Dv MNT_SYNCHRONOUS All I/O to the filesystem is done synchronously. .It Dv MNT_ASYNCHRONOUS No filesystem I/O is done synchronously. .It Dv MNT_LOCAL The filesystem resides locally. .It Dv MNT_QUOTA The filesystem has quotas enabled on it. .It Dv MNT_ROOTFS Identifies the root filesystem. .It Dv MNT_EXRDONLY The filesystem is exported read-only. .It Dv MNT_EXPORTED The filesystem is exported for both reading and writing. .It Dv MNT_DEFEXPORTED The filesystem is exported for both reading and writing to any Internet host. .It Dv MNT_EXPORTANON The filesystem maps all remote accesses to the anonymous user. .It Dv MNT_EXKERB The filesystem is exported with Kerberos uid mapping. .El .Pp Fields that are undefined for a particular file system are set to -1. .Fn Fstatfs returns the same information about an open file referenced by descriptor .Fa fd . .Sh RETURN VALUES Upon successful completion, a value of 0 is returned. Otherwise, -1 is returned and the global variable .Va errno is set to indicate the error. .Sh ERRORS .Fn Statfs fails if one or more of the following are true: .Bl -tag -width Er .It Bq Er ENOTDIR A component of the path prefix of .Fa Path is not a directory. .It Bq Er ENAMETOOLONG The length of a component of .Fa path exceeds .Dv {NAME_MAX} characters, or the length of .Fa path exceeds .Dv {PATH_MAX} characters. .It Bq Er ENOENT The file referred to by .Fa path does not exist. .It Bq Er EACCES Search permission is denied for a component of the path prefix of .Fa path . .It Bq Er ELOOP Too many symbolic links were encountered in translating .Fa path . .It Bq Er EFAULT .Fa Buf or .Fa path points to an invalid address. .It Bq Er EIO An .Tn I/O error occurred while reading from or writing to the file system. .El .Pp .Fn Fstatfs fails if one or more of the following are true: .Bl -tag -width Er .It Bq Er EBADF .Fa Fd is not a valid open file descriptor. .It Bq Er EFAULT .Fa Buf points to an invalid address. .It Bq Er EIO An .Tn I/O error occurred while reading from or writing to the file system. .El .Sh HISTORY The .Fn statfs function first appeared in 4.4BSD.