.\" $NetBSD: statfs.2,v 1.10 1995/06/29 11:40:48 cgd 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 8.3 (Berkeley) 2/11/94 .\" .Dd August 14, 2008 .Dt STATFS 2 .Os .Sh NAME .Nm statfs, .Nm statfs64, .Nm fstatfs, .Nm fstatfs64 .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 TRANSITIONAL SYNOPSIS (NOW DEPRECATED) .Ft int .br .Fn statfs64 "const char *path" "struct statfs64 *buf" ; .sp .Ft int .br .Fn fstatfs64 "int fd" "struct statfs64 *buf" ; .Sh DESCRIPTION The .Fn statfs routine returns information about a mounted file system. The .Fa path argument is the path name of any file or directory within the mounted file system. The .Fa buf argument is a pointer to a .Fa statfs structure. When the macro .Dv _DARWIN_FEATURE_64_BIT_INODE is not defined (see .Xr stat 2 for more information on this macro), the .Fa statfs structure is defined as: .Bd -literal typedef struct { int32_t val[2]; } fsid_t; #define MFSNAMELEN 15 /* length of fs type name, not inc. nul */ #define MNAMELEN 90 /* length of buffer for returned name */ struct statfs { /* when _DARWIN_FEATURE_64_BIT_INODE is NOT defined */ short f_otype; /* type of file system (reserved: zero) */ short f_oflags; /* copy of mount flags (reserved: zero) */ 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 */ short f_reserved1; /* reserved for future use */ short f_type; /* type of file system (reserved) */ long f_flags; /* copy of mount flags (reserved) */ long f_reserved2[2]; /* reserved for future use */ char f_fstypename[MFSNAMELEN]; /* fs type name */ char f_mntonname[MNAMELEN]; /* directory on which mounted */ char f_mntfromname[MNAMELEN]; /* mounted file system */ char f_reserved3; /* reserved for future use */ long f_reserved4[4]; /* reserved for future use */ }; .Ed .Pp However, when the macro .Dv _DARWIN_FEATURE_64_BIT_INODE is defined, the .Fa statfs structure is defined as: .Bd -literal #define MFSTYPENAMELEN 16 /* length of fs type name including null */ #define MAXPATHLEN 1024 #define MNAMELEN MAXPATHLEN struct statfs { /* when _DARWIN_FEATURE_64_BIT_INODE is defined */ uint32_t f_bsize; /* fundamental file system block size */ int32_t f_iosize; /* optimal transfer block size */ uint64_t f_blocks; /* total data blocks in file system */ uint64_t f_bfree; /* free blocks in fs */ uint64_t f_bavail; /* free blocks avail to non-superuser */ uint64_t f_files; /* total file nodes in file system */ uint64_t f_ffree; /* free file nodes in fs */ fsid_t f_fsid; /* file system id */ uid_t f_owner; /* user that mounted the filesystem */ uint32_t f_type; /* type of filesystem */ uint32_t f_flags; /* copy of mount exported flags */ uint32_t f_fssubtype; /* fs sub-type (flavor) */ char f_fstypename[MFSTYPENAMELEN]; /* fs type name */ char f_mntonname[MAXPATHLEN]; /* directory on which mounted */ char f_mntfromname[MAXPATHLEN]; /* mounted filesystem */ uint32_t f_reserved[8]; /* For future use */ }; .Ed .Pp Note that the .Fa f_fstypename , .Fa f_mntonname , and .Fa f_mntfromname fields are also wider in this variant. .Pp Fields that are undefined for a particular file system are set to -1. The .Fn fstatfs routine returns the same information about an open file referenced by descriptor .Fa fd . .Sh FLAGS .Bl -tag -width MNT_UNKNOWNPERMISSIONS These are some of the flags that may be present in the f_flags field. .It Dv MNT_RDONLY A read-only filesystem .It Dv MNT_SYNCHRONOUS File system is written to synchronously .It Dv MNT_NOEXEC Can't exec from filesystem .It Dv MNT_NOSUID Setuid bits are not honored on this filesystem .It Dv MNT_NODEV Don't interpret special files .It Dv MNT_UNION Union with underlying filesysten .It Dv MNT_ASYNC File system written to asynchronously .It Dv MNT_EXPORTED File system is exported .It Dv MNT_LOCAL File system is stored locally .It Dv MNT_QUOTA Quotas are enabled on this file system .It Dv MNT_ROOTFS This file system is the root of the file system .It Dv MNT_DOVOLFS File system supports volfs .It Dv MNT_DONTBROWSE File system is not appropriate path to user data .It Dv MNT_UNKNOWNPERMISSIONS VFS will ignore ownership information on filesystem objects .It Dv MNT_AUTOMOUNTED File system was mounted by automounter .It Dv MNT_JOURNALED File system is journaled .It Dv MNT_DEFWRITE File system should defer writes .It Dv MNT_MULTILABEL MAC support for individual labels .It Dv MNT_CPROTECT File system supports per-file encrypted data protection .El .Sh CAVEATS In Mac OS X versions before 10.4, f_iosize is 4096. On these older systems, use MAXBSIZE instead. .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 The .Fn statfs routine 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 or directory 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 The .Fn fstatfs routine 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 TRANSITIONAL DESCRIPTION (NOW DEPRECATED) The .Fa statfs64 and .Fa fstatfs64 routines are equivalent to their corresponding non-64-suffixed routine, when 64-bit inodes are in effect. They were added before there was support for the symbol variants, and so are now deprecated. Instead of using these, set the .Dv _DARWIN_USE_64_BIT_INODE macro before including header files to force 64-bit inode support. .Pp The .Fa statfs64 structure used by these deprecated routines is the same as the .Fa statfs structure when 64-bit inodes are in effect (see above). .Sh HISTORY The .Fn statfs function first appeared in 4.4BSD. The .Fn statfs64 and .Fn fstatfs64 first appeared in Max OS X 10.5 (Leopard) and are now deprecated in favor of the corresponding symbol variants.