108 lines
2.5 KiB
Groff
108 lines
2.5 KiB
Groff
.TH GETTTYENT 3
|
|
.SH NAME
|
|
getttyent, getttynam, setttyent, endttyent \- interface to /etc/ttytab
|
|
.SH SYNOPSIS
|
|
.ft B
|
|
.nf
|
|
#include <ttyent.h>
|
|
|
|
struct ttyent *getttyent(void)
|
|
struct ttyent *getttynam(const char *\fIname\fP)
|
|
int setttyent(void)
|
|
void endttyent(void)
|
|
.fi
|
|
.ft P
|
|
.SH DESCRIPTION
|
|
The
|
|
.B getttyent
|
|
functions provide an interface to the /etc/ttytab. (See
|
|
.BR ttytab (5)).
|
|
.PP
|
|
To read one of these files one calls
|
|
.B getttyent()
|
|
several times to read the entries in the table until NULL is returned for
|
|
end-of-file.
|
|
.PP
|
|
.B Getttyname()
|
|
searches the
|
|
.B ttytab
|
|
file for the given terminal device. It is equivalent to a call to
|
|
.BR setttyent(),
|
|
several calls to
|
|
.B getttyent()
|
|
to locate the entry, and a final
|
|
.B endttyent()
|
|
to close the file.
|
|
.PP
|
|
.B Setttyent()
|
|
opens or rewinds the ttytab database, and
|
|
.B endttyent() closes it.
|
|
.B Getttyent()
|
|
opens the database if not already open, but does not close it.
|
|
.PP
|
|
The struct ttyent is defined by <ttyent.h> as follows:
|
|
.sp
|
|
.nf
|
|
.ta +4n +6n +15n
|
|
struct ttyent {
|
|
char *ty_name; /* Name of the terminal device. */
|
|
char *ty_type; /* Terminal type name (termcap(3)). */
|
|
char **ty_getty; /* Program to run, normally getty. */
|
|
char **ty_init; /* Initialization command, normally stty. */
|
|
};
|
|
.fi
|
|
.PP
|
|
A valid entry has at least two strings, so both
|
|
.B ty_name
|
|
and
|
|
.B ty_type
|
|
are filled in. The optional
|
|
.B ty_getty
|
|
and
|
|
.B ty_init
|
|
may be NULL (field omitted), point to a pointer that is NULL (null lenght
|
|
field, i.e. ""), or an array of strings terminated by a NULL (field
|
|
present). For now no useful distinction can be made between a omitted field
|
|
and an empty field, so treat both cases as an omission.
|
|
.SH FILES
|
|
.TP 15
|
|
.B /etc/ttytab
|
|
The terminal device database
|
|
.SH "SEE ALSO"
|
|
.BR ttyname (3),
|
|
.BR ttyslot (3),
|
|
.BR ttytab (5),
|
|
.BR init (8).
|
|
.SH DIAGNOSTICS
|
|
.B Setttyent()
|
|
has the same return value and error codes as the
|
|
.BR open (2)
|
|
call it uses to open the ttytab file. The
|
|
.BI get xxx ()
|
|
functions return NULL on end of file, entry not found, or error. You can
|
|
set
|
|
.B errno
|
|
to zero before the call and check it after.
|
|
.SH NOTES
|
|
.B Getttyent()
|
|
and
|
|
.B getttynam()
|
|
return a pointer to static storage that is overwritten in each call.
|
|
.PP
|
|
The Minix
|
|
.B struct ttyent
|
|
has only the
|
|
.B ty_name
|
|
and
|
|
.B ty_type
|
|
fields in common with the BSD implementation. This does not seem to be a
|
|
problem, because most third party software that need to know about terminals
|
|
only look at the
|
|
.B ty_name
|
|
field.
|
|
.SH AUTHOR
|
|
Kees J. Bot (kjb@cs.vu.nl)
|
|
|
|
.\"
|
|
.\" $PchId: getttyent.3,v 1.2 1996/04/11 06:57:26 philip Exp $
|