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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.\" 4. 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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