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108 lines
3.0 KiB
Groff
108 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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.\" 4. 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 June 4, 1993
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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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The current implementation simply 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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