NetBSD/lib/libc/gen/ctermid.3

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.\" $NetBSD: ctermid.3,v 1.7 1998/04/28 19:02:14 fair Exp $
.\"
.\" Copyright (c) 1990, 1991, 1993
.\" The Regents of the University of California. All rights reserved.
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.\"
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" 3. All advertising materials mentioning features or use of this software
.\" must display the following acknowledgement:
.\" This product includes software developed by the University of
.\" California, Berkeley and its contributors.
.\" 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.
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.\" @(#)ctermid.3 8.1 (Berkeley) 6/4/93
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.\"
.Dd June 4, 1993
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.Dt CTERMID 3
.Os
.Sh NAME
.Nm ctermid
.Nd generate terminal pathname
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.Sh LIBRARY
.Lb libc
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.Sh SYNOPSIS
.Fd #include <stdio.h>
.Ft char *
.Fn ctermid "char *buf"
.Sh DESCRIPTION
The
.Fn ctermid
function generates a string, that, when used as a pathname, refers to
the current controlling terminal of the calling process.
.Pp
If
.Ar buf
is the
.Dv NULL
pointer, a pointer to a static area is returned.
Otherwise, the pathname is copied into the memory referenced by
.Ar buf .
The argument
.Ar buf
is assumed to point to an array at least
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.Dv L_ctermid
bytes long (as defined in the include file
.Aq Pa stdio.h ) .
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.Pp
The current implementation simply returns
.Ql /dev/tty .
.Sh RETURN VALUES
Upon successful completion, a
.Pf non- Dv NULL
pointer is returned.
Otherwise, a
.Dv NULL
pointer is returned and the global variable
.Va errno
is set to indicate the error.
.Sh ERRORS
The current implementation detects no error conditions.
.Sh SEE ALSO
.Xr ttyname 3
.Sh STANDARDS
The
.Fn ctermid
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function conforms to
.St -p1003.1-90 .
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.Sh BUGS
By default the
.Fn ctermid
function writes all information to an internal static object.
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Subsequent calls to
.Fn ctermid
will modify the same object.