minix/lib/libc/gen/getttyent.3
Lionel Sambuc f14fb60209 Libraries updates and cleanup
* Updating common/lib
 * Updating lib/csu
 * Updating lib/libc
 * Updating libexec/ld.elf_so
 * Corrected test on __minix in featuretest to actually follow the
   meaning of the comment.
 * Cleaned up _REENTRANT-related defintions.
 * Disabled -D_REENTRANT for libfetch
 * Removing some unneeded __NBSD_LIBC defines and tests

Change-Id: Ic1394baef74d11b9f86b312f5ff4bbc3cbf72ce2
2013-01-14 11:36:26 +01:00

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.\" $NetBSD: getttyent.3,v 1.20 2012/04/22 10:14:18 wiz Exp $
.\"
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.\" @(#)getttyent.3 8.1 (Berkeley) 6/4/93
.\"
.Dd April 5, 2012
.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 capfile 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 capfile 5 ,
.Xr gettytab 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.