f8170e41fe
The entire world seems to use the non-standard TIOCSCTTY ioctl to make a TTY a controlling terminal of a session. Even though tcsetsid(3) is also non-standard, I think it's a lot better to use in our own source code, mainly because it's similar to tcsetpgrp(), tcgetpgrp() and tcgetsid(). I stole the idea from QNX. They do it the other way around; their TIOCSCTTY is just a wrapper around tcsetsid(). tcsetsid() then calls into an IPC framework.
73 lines
2.2 KiB
Groff
73 lines
2.2 KiB
Groff
.\" Copyright (c) 2008 David Xu <davidxu@freebsd.org>
|
|
.\" All rights reserved.
|
|
.\"
|
|
.\" Redistribution and use in source and binary forms, with or without
|
|
.\" modification, are permitted provided that the following conditions
|
|
.\" are met:
|
|
.\" 1. Redistributions of source code must retain the above copyright
|
|
.\" notice, this list of conditions and the following disclaimer.
|
|
.\" 2. Redistributions in binary form must reproduce the above copyright
|
|
.\" notice, this list of conditions and the following disclaimer in the
|
|
.\" documentation and/or other materials provided with the distribution.
|
|
.\"
|
|
.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
|
|
.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
|
.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
.\" SUCH DAMAGE.
|
|
.\"
|
|
.\" $FreeBSD$
|
|
.\"
|
|
.Dd April 15, 2008
|
|
.Dt TCGETSID 3
|
|
.Os
|
|
.Sh NAME
|
|
.Nm tcgetsid
|
|
.Nd get session ID associated with a controlling terminal
|
|
.Sh LIBRARY
|
|
.Lb libc
|
|
.Sh SYNOPSIS
|
|
.In sys/types.h
|
|
.In termios.h
|
|
.Ft pid_t
|
|
.Fn tcgetsid "int fd"
|
|
.Sh DESCRIPTION
|
|
The
|
|
.Fn tcgetsid
|
|
function returns the process group ID of the session leader for a
|
|
controlling terminal specified by
|
|
.Fa fd .
|
|
.Sh ERRORS
|
|
If an error occurs,
|
|
.Fn tcgetsid
|
|
returns -1 and the global variable
|
|
.Va errno
|
|
is set to indicate the error, as follows:
|
|
.Bl -tag -width Er
|
|
.It Bq Er EBADF
|
|
The
|
|
.Fa fd
|
|
argument is not a valid file descriptor.
|
|
.It Bq Er ENOTTY
|
|
The calling process does not have a controlling terminal or the
|
|
underlying terminal device represented by
|
|
.Fa fd
|
|
is not the controlling terminal.
|
|
.El
|
|
.Sh SEE ALSO
|
|
.Xr getsid 2 ,
|
|
.Xr setsid 2 ,
|
|
.Xr tcgetpgrp 3 ,
|
|
.Xr tcsetsid 3
|
|
.Sh STANDARDS
|
|
The
|
|
.Fn tcgetsid
|
|
function conforms to
|
|
.St -xpg4.2 .
|