2004-05-28 04:10:57 +04:00
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.\" $NetBSD: grantpt.3,v 1.3 2004/05/28 00:10:57 wiz Exp $
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2004-05-27 06:58:48 +04:00
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.\"
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.\" Copyright (c) 2004 The NetBSD Foundation, Inc.
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.\" All rights reserved.
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.\"
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.\" This code is derived from software contributed to The NetBSD Foundation
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.\" by Christos Zoulas.
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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. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\" This product includes software developed by the NetBSD
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.\" Foundation, Inc. and its contributors.
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.\" 4. Neither the name of The NetBSD Foundation nor the names of its
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.\" contributors may be used to endorse or promote products derived
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.\" from this software without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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.\" ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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.\" TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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.\" PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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.\" BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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.\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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.\" POSSIBILITY OF SUCH DAMAGE.
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.\"
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.Dd May 25, 2004
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2004-05-28 04:10:57 +04:00
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.Dt GRANTPT 3
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.Os
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.Sh NAME
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.Nm grantpt
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.Nd grant access to a slave pseudo-terminal device
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.Sh LIBRARY
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.Lb libc
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.Sh SYNOPSIS
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.In stdlib.h
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.Ft int
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.Fn grantpt "int fildes"
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.Sh DESCRIPTION
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The
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.Fn grantpt
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function changes the mode and ownership of the slave pseudo-terminal device
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that corresponds to the master pseudo-terminal device associated with
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.Fa fildes
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to be owned by the real user id of the calling process, group id of
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.Dv tty .
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The permissions are set to readable and writable by owner, and writable by
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group.
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If the slave pseudo-terminal device was being accessed by other file
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descriptors at the time, all such access will be revoked.
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.Sh RETURN VALUES
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If successful,
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.Fn grantpt
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returns 0; otherwise a value of \-1 is returned and
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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
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.Fn grantpt
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function will fail if:
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.Bl -tag -width Er
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.It Bq Er EACCESS
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the corresponding pseudo-terminal device could not be accessed.
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.It Bq Er EBADF
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.Fa fildes
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is not a valid descriptor.
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.It Bq Er EINVAL
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.Fa fildes
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is not associated with a master pseudo-terminal device.
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.El
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.Sh NOTES
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Setting the group to
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.Dv tty
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and revoking accesses by other file descriptors are
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.Nx
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extensions.
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Calling
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.Fn grantpt
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is equivalent to:
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.Bd -literal
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ioctl(fildes, TIOCGRANTPT, 0);
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.Ed
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.Sh SEE ALSO
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.Xr ioctl 2 ,
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.Xr posix_openpt 3 ,
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.Xr ptsname 3 ,
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.Xr unlockpt 3
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.Sh STANDARDS
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The
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.Fn grantpt
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function conforms to
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.St -p1003.1-2001 .
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Its first release was in
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.St -xpg4.2 .
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