.\" $NetBSD: getfsstat.2,v 1.6 1995/06/29 11:40:44 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. .\" .\" @(#)getfsstat.2 8.1 (Berkeley) 6/9/93 .\" .Dd Oct 28, 2008 .Dt GETFSSTAT 2 .Os .Sh NAME .Nm getfsstat .Nd get list of all mounted file systems .Sh SYNOPSIS .Fd #include .Fd #include .Fd #include .Ft int .Fn getfsstat "struct statfs *buf" "int bufsize" "int flags" .Sh TRANSITIIONAL SYNOPSIS (NOW DEPRECATED) .Ft int .br .Fn getfsstat64 "struct statfs64 *buf" "int bufsize" "int flags" ; .Sh DESCRIPTION The .Fn getfsstat function returns information about all mounted file systems. The .Fa buf argument is a pointer to an array of .Xr statfs structures. .Pp As of Mac OS X 10.6, the default size of the .Ft ino_t type is 64 bits (the macro .Dv _DARWIN_FEATURE_64_BIT_INODE will be defined). While there is no .Ft ino_t type used in the .Xr statfs structure, the changes to .Fn getfsstat are grouped together with the 64-bit inode changes. The string fields in the .Xr statfs structure are larger and the variant symbol .Li _getfsstat$INODE64 will be automatically used. The .Xr statfs structure is defined as: .Bd -literal typedef struct { int32_t val[2]; } fsid_t; #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 (In 10.5, 64-bit .Ft ino_t , larger .Xr statfs structure and variant symbol were available if the macro .Dv _DARWIN_USE_64_BIT_INODE is defined before any header files are included; this macro is optional in 10.6.) .Pp If the macro .Dv _DARWIN_NO_64_BIT_INODE is defined before any header files are included, or if the deployment target is less than 10.6, the legacy .Xr statfs structure will be in effect. The .Ft ino_t type will be 32 bits (the .Dv _DARWIN_FEATURE_64_BIT_INODE macro will not be defined), the strings in the .Xr statfs structure will be their smaller legacy size (and long mount paths may no longer fit) and the undecorated symbol .Li _getfsstat will be used. This legacy .Fa statfs structure is defined as: .Bd -literal #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 Fields that are undefined for a particular file system are set to -1. The buffer is filled with an array of .Fa statfs structures, one for each mounted file system up to the size specified by .Fa bufsize . .Pp If .Fa buf is given as NULL, .Fn getfsstat returns just the number of mounted file systems. .Pp If .Fa flags is set to .Dv MNT_NOWAIT , .Fn getfsstat will directly return the information retained in the kernel to avoid delays caused by waiting for updated information from a file system that is perhaps temporarily unable to respond. Some of the information returned may be out of date, however; if .Fa flags is set to .Dv MNT_WAIT or .Dv MNT_DWAIT instead, .Fn getfsstat will request updated information from each mounted filesystem before returning. .Sh RETURN VALUES Upon successful completion, the number of .Fa statfs structures is returned. Otherwise, -1 is returned and the global variable .Va errno is set to indicate the error. .Sh ERRORS .Fn Getfsstat fails if one or more of the following are true: .Bl -tag -width Er .It Bq Er EFAULT The .Fa buf argument 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 .Fn getfsstat64 routine is equivalent to the default .Fn getfstat (when .Dv _DARWIN_FEATURE_64_BIT_INODE is defined), so there is no longer any reason to use it (it will be removed in the future). .Sh SEE ALSO .Xr statfs 2 , .Xr fstab 5 , .Xr mount 8 .Sh HISTORY The .Fn getfsstat function first appeared in 4.4BSD.