7e6cabd06e
Renumber cluase 4 to 3, per what everybody else did when BSD granted them permission to remove clause 3. My insistance on keeping the same numbering for legal reasons is too pedantic, so give up on that point. Submitted by: Jan Schaumann <jschauma@stevens.edu> Pull Request: https://github.com/freebsd/freebsd/pull/96
109 lines
3.0 KiB
Groff
109 lines
3.0 KiB
Groff
.\" Copyright (c) 1990, 1991, 1993
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.\" The Regents of the University of California. All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" @(#)ctermid.3 8.1 (Berkeley) 6/4/93
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.\" $FreeBSD$
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.\"
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.Dd October 1, 2011
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.Dt CTERMID 3
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.Os
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.Sh NAME
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.Nm ctermid
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.Nd generate terminal pathname
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.Sh LIBRARY
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.Lb libc
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.Sh SYNOPSIS
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.In stdio.h
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.Ft char *
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.Fn ctermid "char *buf"
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.Ft char *
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.Fn ctermid_r "char *buf"
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.Sh DESCRIPTION
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The
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.Fn ctermid
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function generates a string, that, when used as a pathname, refers to
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the current controlling terminal of the calling process.
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.Pp
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If
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.Fa buf
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is the
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.Dv NULL
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pointer, a pointer to a static area is returned.
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Otherwise, the pathname is copied into the memory referenced by
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.Fa buf .
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The argument
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.Fa buf
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is assumed to be at least
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.Dv L_ctermid
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(as defined in the include
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file
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.In stdio.h )
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bytes long.
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.Pp
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The
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.Fn ctermid_r
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function
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provides the same functionality as
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.Fn ctermid
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except that if
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.Fa buf
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is a
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.Dv NULL
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pointer,
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.Dv NULL
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is returned.
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.Pp
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If no suitable lookup of the controlling terminal name can be performed,
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this implementation returns
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.Ql /dev/tty .
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.Sh RETURN VALUES
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Upon successful completion, a
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.Pf non- Dv NULL
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pointer is returned.
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Otherwise, a
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.Dv NULL
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pointer is returned and the global variable
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.Va errno
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is set to indicate the error.
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.Sh ERRORS
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The current implementation detects no error conditions.
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.Sh SEE ALSO
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.Xr ttyname 3
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.Sh STANDARDS
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The
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.Fn ctermid
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function conforms to
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.St -p1003.1-88 .
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.Sh BUGS
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By default the
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.Fn ctermid
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function
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writes all information to an internal static object.
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Subsequent calls to
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.Fn ctermid
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will modify the same object.
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