fbbd9655e5
Renumber cluase 4 to 3, per what everybody else did when BSD granted them permission to remove clause 3. My insistance on keeping the same numbering for legal reasons is too pedantic, so give up on that point. Submitted by: Jan Schaumann <jschauma@stevens.edu> Pull Request: https://github.com/freebsd/freebsd/pull/96
186 lines
4.5 KiB
Groff
186 lines
4.5 KiB
Groff
.\" Copyright (c) 1983, 1991, 1993
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.\" The Regents of the University of California. All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" @(#)getfsent.3 8.1 (Berkeley) 6/4/93
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.\" $FreeBSD$
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.\"
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.Dd April 7, 2003
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.Dt GETFSENT 3
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.Os
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.Sh NAME
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.Nm getfsent ,
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.Nm getfsspec ,
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.Nm getfsfile ,
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.Nm setfsent ,
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.Nm endfsent
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.Nd get file system descriptor file entry
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.Sh LIBRARY
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.Lb libc
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.Sh SYNOPSIS
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.In fstab.h
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.Ft "struct fstab *"
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.Fn getfsent void
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.Ft "struct fstab *"
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.Fn getfsspec "const char *spec"
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.Ft "struct fstab *"
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.Fn getfsfile "const char *file"
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.Ft int
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.Fn setfsent void
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.Ft void
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.Fn endfsent void
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.Ft void
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.Fn setfstab "const char *file"
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.Ft "const char *"
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.Fn getfstab void
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.Sh DESCRIPTION
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The
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.Fn getfsent ,
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.Fn getfsspec ,
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and
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.Fn getfsfile
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functions
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each return a pointer to an object with the following structure
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containing the broken-out fields of a line in the file system
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description file,
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.In fstab.h .
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.Bd -literal -offset indent
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struct fstab {
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char *fs_spec; /* block special device name */
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char *fs_file; /* file system path prefix */
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char *fs_vfstype; /* File system type, ufs, nfs */
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char *fs_mntops; /* Mount options ala -o */
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char *fs_type; /* FSTAB_* from fs_mntops */
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int fs_freq; /* dump frequency, in days */
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int fs_passno; /* pass number on parallel fsck */
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};
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.Ed
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.Pp
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The fields have meanings described in
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.Xr fstab 5 .
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.Pp
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The
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.Fn setfsent
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function
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opens the file (closing any previously opened file) or rewinds it
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if it is already open.
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.Pp
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The
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.Fn endfsent
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function
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closes the file.
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.Pp
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The
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.Fn setfstab
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function sets the file to be used by subsequent operations.
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The value set by
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.Fn setfstab
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does not persist across calls to
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.Fn endfsent .
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.Pp
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The
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.Fn getfstab
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function returns the name of the file that will be used.
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.Pp
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The
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.Fn getfsspec
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and
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.Fn getfsfile
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functions
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search the entire file (opening it if necessary) for a matching special
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file name or file system file name.
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.Pp
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For programs wishing to read the entire database,
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.Fn getfsent
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reads the next entry (opening the file if necessary).
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.Pp
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All entries in the file with a type field equivalent to
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.Dv FSTAB_XX
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are ignored.
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.Sh RETURN VALUES
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The
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.Fn getfsent ,
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.Fn getfsspec ,
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and
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.Fn getfsfile
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functions
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return a
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.Dv NULL
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pointer on
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.Dv EOF
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or error.
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The
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.Fn setfsent
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function
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returns 0 on failure, 1 on success.
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The
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.Fn endfsent
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function
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returns nothing.
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.Sh ENVIRONMENT
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.Bl -tag -width ".Ev PATH_FSTAB"
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.It Ev PATH_FSTAB
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If the environment variable
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.Ev PATH_FSTAB
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is set, all operations are performed against the specified file.
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.Ev PATH_FSTAB
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will not be honored if the process environment or memory address space is
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considered
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.Dq tainted .
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(See
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.Xr issetugid 2
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for more information.)
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.El
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.Sh FILES
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.Bl -tag -width /etc/fstab -compact
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.It Pa /etc/fstab
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.El
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.Sh SEE ALSO
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.Xr fstab 5
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.Sh HISTORY
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The
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.Fn getfsent
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function appeared in
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.Bx 4.0 ;
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the
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.Fn endfsent ,
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.Fn getfsfile ,
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.Fn getfsspec ,
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and
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.Fn setfsent
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functions appeared in
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.Bx 4.3 ;
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the
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.Fn setfstab
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and
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.Fn getfstab
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functions appeared in
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.Fx 5.1 .
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.Sh BUGS
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These functions use static data storage;
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if the data is needed for future use, it should be
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copied before any subsequent calls overwrite it.
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