src.mk, All pages: Move man* to man/

[thirdparty/man-pages.git] / man3 / tcgetsid.3

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-.\" Copyright (C) 2002 Andries Brouwer <aeb@cwi.nl>
-.\"
-.\" SPDX-License-Identifier: Linux-man-pages-copyleft
-.\"
-.TH TCGETSID 3 2021-03-22 "Linux man-pages (unreleased)"
-.SH NAME
-tcgetsid \- get session ID
-.SH LIBRARY
-Standard C library
-.RI ( libc ", " \-lc )
-.SH SYNOPSIS
-.nf
-.BR "#define _XOPEN_SOURCE 500" "        /* See feature_test_macros(7) */"
-.B "#include <termios.h>"
-.PP
-.BI "pid_t tcgetsid(int " fd );
-.fi
-.SH DESCRIPTION
-The function
-.BR tcgetsid ()
-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
-.BR tcgetsid ()
-will return the session ID of this session.
-Otherwise, \-1 is returned, and
-.I errno
-is set to indicate the error.
-.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 VERSIONS
-.BR tcgetsid ()
-is provided in glibc since version 2.1.
-.SH ATTRIBUTES
-For an explanation of the terms used in this section, see
-.BR attributes (7).
-.ad l
-.nh
-.TS
-allbox;
-lbx lb lb
-l l l.
-Interface      Attribute       Value
-T{
-.BR tcgetsid ()
-T}     Thread safety   MT-Safe
-.TE
-.hy
-.ad
-.sp 1
-.SH STANDARDS
-POSIX.1-2001, POSIX.1-2008.
-.SH NOTES
-This function is implemented via the
-.B TIOCGSID
-.BR ioctl (2),
-present
-since Linux 2.1.71.
-.SH SEE ALSO
-.BR getsid (2)