4.3BSD - /usr/man/cat3/getttyent.0

GETTTYENT(3)                                                      GETTTYENT(3)


NAME
       getttyent, getttynam, setttyent, endttyent - get ttys file entry

SYNOPSIS
       #include <ttyent.h>

       struct ttyent *getttyent()

       struct ttyent *getttynam(name)
       char *name;

       setttyent()

       endttyent()

DESCRIPTION
       Getttyent,  and  getttynam  each return a pointer to an object with the
       following structure containing the broken-out fields of a line from the
       tty description file.

              /*
               * Copyright (c) 1989, 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.
               * 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.
               *
               *   @(#)ttyent.h   8.1 (Berkeley) 6/2/93
               */

              #ifndef   _TTYENT_H
              #define   _TTYENT_H 1

              #include <features.h>

              #define   _PATH_TTYS     "/etc/ttys"

              #define   _TTYS_OFF "off"
              #define   _TTYS_ON  "on"
              #define   _TTYS_SECURE   "secure"
              #define   _TTYS_WINDOW   "window"

              struct ttyent {
                   char *ty_name; /* terminal device name */
                   char *ty_getty;     /* command to execute, usually getty */
                   char *ty_type; /* terminal type for termcap */
              #define   TTY_ON         0x01 /* enable logins (start ty_getty program) */
              #define   TTY_SECURE     0x02 /* allow uid of 0 to login */
                   int  ty_status;     /* status flags */
                   char      *ty_window;    /* command to start up window manager */
                   char *ty_comment;   /* comment field */
              };


              __BEGIN_DECLS

              extern struct ttyent *getttyent (void) __THROW;
              extern struct ttyent *getttynam (__const char *__tty) __THROW;
              extern int setttyent (void) __THROW;
              extern int endttyent (void) __THROW;

              __END_DECLS

              #endif /* ttyent.h */


       ty_name      is the name of the character-special file in the directory
                    ‘‘/dev".  For various  reasons,  it  must  reside  in  the
                    directory ‘‘/dev".

       ty_getty     is the command (usually getty(8)) which is invoked by init
                    to initialize tty  line  characteristics.   In  fact,  any
                    arbitrary  command can be used; a typical use is to initi‐
                    ate a terminal emulator in a window system.

       ty_type      is the name of the default terminal type connected to this
                    tty  line.  This  is  typically a name from the termcap(5)
                    data base.  The environment variable ‘TERM’ is initialized
                    with this name by getty(8) or login(1).

       ty_status    is  a mask of bit fields which indicate various actions to
                    be allowed on this tty line. The following is  a  descrip‐
                    tion of each flag.

                    TTY_ON       Enables  logins (i.e., init(8) will start the
                                 specified ‘‘getty" command on this entry).

                    TTY_SECURE   Allows root to login on this  terminal.  Note
                                 that ‘TTY_ON’ must be included for this to be
                                 useful.

       ty_window    is the command to execute for a window  system  associated
                    with  the  line.  The window system will be started before
                    the command specified in the ty_getty entry  is  executed.
                    If none is specified, this will be null.

       ty_comment   is the trailing comment field, if any; a leading delimiter
                    and white space will be removed.

       Getttyent reads the next line from the ttys file, opening the  file  if
       necessary; setttyent rewinds the file; endttyent closes it.

       Getttynam searches from the beginning of the file until a matching name
       is found (or until EOF is encountered).

FILES
       /etc/ttys

SEE ALSO
       login(1),  ttyslot(3),  ttys(5),  gettytab(5),  termcap(5),   getty(8),
       init(8)

DIAGNOSTICS
       Null pointer (0) returned on EOF or error.

BUGS
       All  information  is contained in a static area so it must be copied if
       it is to be saved.


4.3 Berkeley Distribution        May 20, 1986                     GETTTYENT(3)