213 lines
5.8 KiB
Groff
213 lines
5.8 KiB
Groff
.\" Copyright (c) 1989, 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. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\" This product includes software developed by the University of
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.\" California, Berkeley and its contributors.
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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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.\" @(#)getttyent.3 8.1 (Berkeley) 6/4/93
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.\" $FreeBSD$
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.\"
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.Dd November 17, 1996
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.Dt GETTTYENT 3
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.Os BSD 4.3
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.Sh NAME
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.Nm getttyent ,
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.Nm getttynam ,
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.Nm setttyent ,
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.Nm endttyent
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.Nd get ttys file entry
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.Nm isdialuptty ,
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.Nm isnettty
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.Nd determine tty type from ttys file entry
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.Sh LIBRARY
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.Lb libc
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.Sh SYNOPSIS
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.Fd #include <ttyent.h>
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.Ft struct ttyent *
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.Fn getttyent void
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.Ft struct ttyent *
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.Fn getttynam "const char *name"
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.Ft int
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.Fn setttyent void
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.Ft int
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.Fn endttyent void
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.Ft int
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.Fn isdialuptty "const char *name"
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.Ft int
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.Fn isnettty "const char *name"
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.Sh DESCRIPTION
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The
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.Fn getttyent ,
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and
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.Fn getttynam
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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 from the tty description
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file.
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.Bd -literal
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struct ttyent {
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char *ty_name; /* terminal device name */
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char *ty_getty; /* command to execute, usually getty */
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char *ty_type; /* terminal type for termcap */
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#define TTY_ON 0x01 /* enable logins (start ty_getty program) */
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#define TTY_SECURE 0x02 /* allow uid of 0 to login */
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#define TTY_DIALUP 0x04 /* is a dialup tty */
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#define TTY_NETWORK 0x08 /* is a network tty */
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int ty_status; /* status flags */
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char *ty_window; /* command to start up window manager */
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char *ty_comment; /* comment field */
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char *ty_group; /* tty group name */
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};
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.Ed
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.Pp
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The fields are as follows:
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.Bl -tag -width ty_comment
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.It Fa ty_name
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The name of the character-special file.
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.It Fa ty_getty
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The name of the command invoked by
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.Xr init 8
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to initialize tty line characteristics.
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.It Fa ty_type
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The name of the default terminal type connected to this tty line.
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.It Fa ty_status
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A mask of bit fields which indicate various actions allowed on this
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tty line.
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The possible flags are as follows:
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.Bl -tag -width TTY_NETWORK
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.It Dv TTY_ON
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Enables logins (i.e.,
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.Xr init 8
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will start the command referenced by
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.Fa ty_getty
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on this entry).
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.It Dv TTY_SECURE
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Allow users with a uid of 0 to login on this terminal.
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.It Dv TTY_DIALUP
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Identifies a tty as a dialin line.
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If this flag is set, then
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.Fn isdialuptty
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will return a non-zero value.
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.It Dv TTY_NETWORK
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Identifies a tty used for network connections.
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If this flag is set, then
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.Fn isnettty
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will return a non-zero value.
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.El
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.It Fa ty_window
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The command to execute for a window system associated with the line.
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.It Fa ty_group
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A group name to which the tty belongs.
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If no group is specified in the ttys description file,
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then the tty is placed in an anonymous group called "none".
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.It Fa ty_comment
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Any trailing comment field, with any leading hash marks (``#'') or
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whitespace removed.
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.El
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.Pp
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If any of the fields pointing to character strings are unspecified,
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they are returned as null pointers.
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The field
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.Fa ty_status
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will be zero if no flag values are specified.
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.Pp
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See
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.Xr ttys 5
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for a more complete discussion of the meaning and usage of the
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fields.
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.Pp
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The
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.Fn getttyent
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function
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reads the next line from the ttys file, opening the file if necessary.
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The
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.Fn setttyent
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function
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rewinds the file if open, or opens the file if it is unopened.
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The
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.Fn endttyent
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function
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closes any open files.
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.Pp
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The
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.Fn getttynam
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function
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searches from the beginning of the file until a matching
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.Fa name
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is found
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(or until
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.Dv EOF
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is encountered).
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.Sh RETURN VALUES
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The routines
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.Fn getttyent
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and
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.Fn getttynam
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return a null pointer on
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.Dv EOF
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or error.
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The
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.Fn setttyent
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function
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and
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.Fn endttyent
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return 0 on failure and 1 on success.
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.Pp
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The routines
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.Fn isdialuptty
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and
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.Fn isnettty
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return non-zero if the dialup or network flag is set for the
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tty entry relating to the tty named by the parameter, and
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zero otherwise.
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.Sh FILES
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.Bl -tag -width /etc/ttys -compact
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.It Pa /etc/ttys
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.El
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.Sh SEE ALSO
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.Xr login 1 ,
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.Xr ttyslot 3 ,
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.Xr gettytab 5 ,
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.Xr termcap 5 ,
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.Xr ttys 5 ,
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.Xr getty 8 ,
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.Xr init 8
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.Sh HISTORY
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The
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.Fn getttyent ,
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.Fn getttynam ,
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.Fn setttyent ,
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and
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.Fn endttyent
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functions appeared in
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.Bx 4.3 .
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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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