9457bcdc60
Phase out ttyslot(3). The ttyslot() function was originally part for SUSv1, marked LEGACY in SUSv2 and removed later on. This function only makes sense when using utmp(5), because it was used to determine the offset of the record for the controlling TTY. It makes little sense to keep it here, because the new utmpx file format doesn't index based on TTY slots.
209 lines
5.5 KiB
Groff
209 lines
5.5 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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.\" 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
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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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.Nm isdialuptty ,
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.Nm isnettty
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.Nd
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.Xr ttys 5
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file routines
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.Sh LIBRARY
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.Lb libc
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.Sh SYNOPSIS
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.In 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 argument, 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 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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