minix/lib/libc/gen/getttyent.3
Ben Gras 2fe8fb192f Full switch to clang/ELF. Drop ack. Simplify.
There is important information about booting non-ack images in
docs/UPDATING. ack/aout-format images can't be built any more, and
booting clang/ELF-format ones is a little different. Updating to the
new boot monitor is recommended.

Changes in this commit:

	. drop boot monitor -> allowing dropping ack support
	. facility to copy ELF boot files to /boot so that old boot monitor
	  can still boot fairly easily, see UPDATING
	. no more ack-format libraries -> single-case libraries
	. some cleanup of OBJECT_FMT, COMPILER_TYPE, etc cases
	. drop several ack toolchain commands, but not all support
	  commands (e.g. aal is gone but acksize is not yet).
	. a few libc files moved to netbsd libc dir
	. new /bin/date as minix date used code in libc/
	. test compile fix
	. harmonize includes
	. /usr/lib is no longer special: without ack, /usr/lib plays no
	  kind of special bootstrapping role any more and bootstrapping
	  is done exclusively through packages, so releases depend even
	  less on the state of the machine making them now.
	. rename nbsd_lib* to lib*
	. reduce mtree
2012-02-14 14:52:02 +01:00

219 lines
6 KiB
Groff

.\" $NetBSD: getttyent.3,v 1.18 2006/04/23 16:46:32 wiz Exp $
.\"
.\" Copyright (c) 1989, 1991, 1993
.\" The Regents of the University of California. All rights reserved.
.\"
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.\" modification, are permitted provided that the following conditions
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.\" 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
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.\" 3. 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.
.\"
.\" @(#)getttyent.3 8.1 (Berkeley) 6/4/93
.\"
.Dd April 18, 2006
.Dt GETTTYENT 3
.Os
.Sh NAME
.Nm getttyent ,
.Nm getttynam ,
.Nm setttyent ,
.Nm setttyentpath ,
.Nm endttyent
.Nd get ttys file entry
.Sh LIBRARY
.Lb libc
.Sh SYNOPSIS
.In ttyent.h
.Ft struct ttyent *
.Fn getttyent
.Ft struct ttyent *
.Fn getttynam "char *name"
.Ft int
.Fn setttyent void
.Ft int
.Fn setttyentpath "const char *path"
.Ft int
.Fn endttyent void
.Sh DESCRIPTION
The
.Fn getttyent ,
and
.Fn getttynam
functions
each return a pointer to an object, with the following structure,
containing the broken-out fields of a line from the tty description
file.
.Bd -literal
struct ttyent {
char *ty_name; /* terminal device name */
char *ty_getty; /* command to execute */
char *ty_type; /* terminal type */
#define TTY_ON 0x01 /* enable logins */
#define TTY_SECURE 0x02 /* allow uid of 0 to login */
#define TTY_LOCAL 0x04 /* set 'CLOCAL' on open (dev. specific) */
#define TTY_RTSCTS 0x08 /* set 'CRTSCTS' on open (dev. specific) */
#define TTY_SOFTCAR 0x10 /* ignore hardware carrier (dev. spec.) */
#define TTY_MDMBUF 0x20 /* set 'MDMBUF' on open (dev. specific) */
#define TTY_DTRCTS 0x40 /* set 'CDTRCTS' on open (dev. specific) */
int ty_status; /* flag values */
char *ty_window; /* command for window manager */
char *ty_comment; /* comment field */
char *ty_class; /* category of tty usage */
};
.Ed
.Pp
The fields are as follows:
.Bl -tag -width ty_comment
.It Fa ty_name
The name of the character-special file.
.It Fa ty_getty
The name of the command invoked by
.Xr init 8
to initialize tty line characteristics.
.It Fa ty_type
The name of the default terminal type connected to this tty line.
.It Fa ty_status
A mask of bit fields which indicate various actions allowed on this
tty line.
The possible flags are as follows:
.Bl -tag -width TTY_SOFTCAR
.It Dv TTY_ON
Enables logins (i.e.,
.Xr init 8
will start the command referenced by
.Fa ty_getty
on this entry).
.It Dv TTY_SECURE
Allow users with a uid of 0 to login on this terminal.
.It Dv TTY_LOCAL
If the terminal port's driver supports it, cause the line
to be treated as ``local.''
.It Dv TTY_MDMBUF
If the terminal port's driver supports it, use
DTR/DCD hardware flow control on the line by default.
.It Dv TTY_RTSCTS
If the terminal port's driver supports it, use
full-duplex RTS/CTS hardware flow control on the line
by default.
.It Dv TTY_SOFTCAR
If the terminal port's driver supports it, ignore hardware
carrier on the line.
.El
.It Fa ty_window
The command to execute for a window system associated with the line.
.It Fa ty_comment
Any trailing comment field, with any leading hash marks (``#'') or
whitespace removed.
.It Fa ty_class
A key indexing into a termcap-style database (/etc/ttyclasses)
of attributes for this class of tty.
No attributes are currently defined or used,
so there are currently no functions to retrieve them.
.El
.Pp
If any of the fields pointing to character strings are unspecified,
they are returned as null pointers.
The field
.Fa ty_status
will be zero if no flag values are specified.
.Pp
See
.Xr ttys 5
for a more complete discussion of the meaning and usage of the
fields.
.Pp
The
.Fn getttyent
function
reads the next line from the ttys file, opening the file if necessary.
The
.Fn setttyent
function
rewinds the file if open, or opens the file if it is unopened.
The
.Fn setttyentpath
function
is equivalent to
.Fn setttyent
but accepts an additional argument to read the ttys information from
an alternate file instead of the default location
.Pq defined in Dv _PATH_TTYS .
The
.Fn endttyent
function
closes any open files.
.Pp
The
.Fn getttynam
function
searches from the beginning of the file until a matching
.Fa name
is found
(or until
.Dv EOF
is encountered).
.Sh RETURN VALUES
The routines
.Fn getttyent
and
.Fn getttynam
return a null pointer on
.Dv EOF
or error.
The
.Fn setttyent
and
.Fn setttyentpath
functions
and
.Fn endttyent
return 0 on failure and 1 on success.
.Sh FILES
.Bl -tag -width /etc/ttys -compact
.It Pa /etc/ttys
.El
.Sh SEE ALSO
.Xr login 1 ,
.Xr ttyslot 3 ,
.Xr gettytab 5 ,
.Xr termcap 5 ,
.Xr ttys 5 ,
.Xr getty 8 ,
.Xr init 8 ,
.Xr ttyflags 8
.Sh HISTORY
The
.Fn getttyent ,
.Fn getttynam ,
.Fn setttyent ,
and
.Fn endttyent
functions appeared in
.Bx 4.3 .
The
.Fn setttyentpath
function appeared in
.Nx 4.0 .
.Sh BUGS
These functions use static data storage;
if the data is needed for future use, it should be
copied before any subsequent calls overwrite it.