2004-11-03 13:51:07 +00:00
|
|
|
.\" Copyright (C) 2002 Andries Brouwer <aeb@cwi.nl>
|
|
|
|
.\"
|
|
|
|
.\" Permission is granted to make and distribute verbatim copies of this
|
|
|
|
.\" manual provided the copyright notice and this permission notice are
|
|
|
|
.\" preserved on all copies.
|
|
|
|
.\"
|
|
|
|
.\" Permission is granted to copy and distribute modified versions of this
|
|
|
|
.\" manual under the conditions for verbatim copying, provided that the
|
|
|
|
.\" entire resulting derived work is distributed under the terms of a
|
|
|
|
.\" permission notice identical to this one.
|
|
|
|
.\"
|
|
|
|
.\" Since the Linux kernel and libraries are constantly changing, this
|
|
|
|
.\" manual page may be incorrect or out-of-date. The author(s) assume no
|
|
|
|
.\" responsibility for errors or omissions, or for damages resulting from
|
|
|
|
.\" the use of the information contained herein. The author(s) may not
|
|
|
|
.\" have taken the same level of care in the production of this manual,
|
|
|
|
.\" which is licensed free of charge, as they might when working
|
|
|
|
.\" professionally.
|
|
|
|
.\"
|
|
|
|
.\" Formatted or processed versions of this manual, if unaccompanied by
|
|
|
|
.\" the source, must acknowledge the copyright and authors of this work.
|
|
|
|
.\"
|
|
|
|
.TH TCGETSID 3 2003-01-30 "POSIX" "Linux Programmer's Manual"
|
|
|
|
.SH NAME
|
|
|
|
tcgetsid \- get session ID
|
|
|
|
.SH SYNOPSIS
|
|
|
|
.sp
|
|
|
|
.BR "#include <termios.h>"
|
|
|
|
.sp
|
|
|
|
.BI "pid_t tcgetsid(int " fd );
|
|
|
|
.SH DESCRIPTION
|
|
|
|
The function
|
2005-10-19 07:07:02 +00:00
|
|
|
.BR tcgetsid ()
|
2004-11-03 13:51:07 +00:00
|
|
|
returns the session ID of the current session that has the
|
|
|
|
terminal associated to
|
|
|
|
.I fd
|
|
|
|
as controlling terminal.
|
|
|
|
This terminal must be the controlling terminal of the calling process.
|
|
|
|
.SH "RETURN VALUE"
|
|
|
|
When
|
|
|
|
.I fd
|
|
|
|
refers to the controlling terminal of our session,
|
|
|
|
the function
|
2005-10-19 07:07:02 +00:00
|
|
|
.BR tcgetsid ()
|
2004-11-03 13:51:07 +00:00
|
|
|
will return the session ID of this session.
|
|
|
|
Otherwise, \-1 is returned, and
|
|
|
|
.I errno
|
|
|
|
is set appropriately.
|
|
|
|
.SH ERRORS
|
|
|
|
.TP
|
|
|
|
.B EBADF
|
|
|
|
.I fd
|
|
|
|
is not a valid file descriptor.
|
|
|
|
.TP
|
|
|
|
.B ENOTTY
|
|
|
|
The calling process does not have a controlling terminal, or
|
|
|
|
it has one but it is not described by
|
|
|
|
.IR fd .
|
|
|
|
.SH NOTES
|
2005-10-20 15:11:10 +00:00
|
|
|
This function is implemented via the TIOCGSID
|
|
|
|
.BR ioctl (),
|
|
|
|
present
|
2004-11-03 13:51:07 +00:00
|
|
|
since Linux 2.1.71.
|
2006-08-04 12:39:17 +00:00
|
|
|
.SH "CONFORMING TO"
|
2006-08-03 13:57:30 +00:00
|
|
|
POSIX.1-2001
|
2004-11-03 13:51:07 +00:00
|
|
|
.SH "SEE ALSO"
|
|
|
|
.BR getsid (2)
|