Merging upstream version 6.8.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 0 insertions, 169 deletions

diff --git a/man3/ttyslot.3 b/man3/ttyslot.3
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-'\" t
-.\" Copyright (C) 2002 Andries Brouwer <aeb@cwi.nl>
-.\"
-.\" SPDX-License-Identifier: Linux-man-pages-copyleft
-.\"
-.\" This replaces an earlier man page written by Walter Harms
-.\" <walter.harms@informatik.uni-oldenburg.de>.
-.\"
-.TH ttyslot 3 2023-10-31 "Linux man-pages 6.7"
-.SH NAME
-ttyslot \- find the slot of the current user's terminal in some file
-.SH LIBRARY
-Standard C library
-.RI ( libc ", " \-lc )
-.SH SYNOPSIS
-.nf
-.BR "#include <unistd.h>" "       /* See NOTES */"
-.P
-.B "int ttyslot(void);"
-.fi
-.P
-.RS -4
-Feature Test Macro Requirements for glibc (see
-.BR feature_test_macros (7)):
-.RE
-.P
-.BR ttyslot ():
-.nf
-    Since glibc 2.24:
-        _DEFAULT_SOURCE
-    From glibc 2.20 to glibc 2.23:
-        _DEFAULT_SOURCE || (_XOPEN_SOURCE && _XOPEN_SOURCE < 500)
-    glibc 2.19 and earlier:
-        _BSD_SOURCE || (_XOPEN_SOURCE && _XOPEN_SOURCE < 500)
-.fi
-.SH DESCRIPTION
-The legacy function
-.BR ttyslot ()
-returns the index of the current user's entry in some file.
-.P
-Now "What file?" you ask.
-Well, let's first look at some history.
-.SS Ancient history
-There used to be a file
-.I /etc/ttys
-in UNIX\ V6, that was read by the
-.BR init (1)
-program to find out what to do with each terminal line.
-Each line consisted of three characters.
-The first character was either \[aq]0\[aq] or \[aq]1\[aq],
-where \[aq]0\[aq] meant "ignore".
-The second character denoted the terminal: \[aq]8\[aq] stood for "/dev/tty8".
-The third character was an argument to
-.BR getty (8)
-indicating the sequence of line speeds to try (\[aq]\-\[aq] was: start trying
-110 baud).
-Thus a typical line was "18\-".
-A hang on some line was solved by changing the \[aq]1\[aq] to a \[aq]0\[aq],
-signaling init, changing back again, and signaling init again.
-.P
-In UNIX\ V7 the format was changed: here the second character
-was the argument to
-.BR getty (8)
-indicating the sequence of line speeds to try (\[aq]0\[aq] was: cycle through
-300-1200-150-110 baud; \[aq]4\[aq] was for the on-line console DECwriter)
-while the rest of the line contained the name of the tty.
-Thus a typical line was "14console".
-.P
-Later systems have more elaborate syntax.
-System V-like systems have
-.I /etc/inittab
-instead.
-.SS Ancient history (2)
-On the other hand, there is the file
-.I /etc/utmp
-listing the people currently logged in.
-It is maintained by
-.BR login (1).
-It has a fixed size, and the appropriate index in the file was
-determined by
-.BR login (1)
-using the
-.BR ttyslot ()
-call to find the number of the line in
-.I /etc/ttys
-(counting from 1).
-.SS The semantics of ttyslot
-Thus, the function
-.BR ttyslot ()
-returns the index of the controlling terminal of the calling process
-in the file
-.IR /etc/ttys ,
-and that is (usually) the same as the index of the entry for the
-current user in the file
-.IR /etc/utmp .
-BSD still has the
-.I /etc/ttys
-file, but System V-like systems do not, and hence cannot refer to it.
-Thus, on such systems the documentation says that
-.BR ttyslot ()
-returns the current user's index in the user accounting data base.
-.SH RETURN VALUE
-If successful, this function returns the slot number.
-On error (e.g., if none of the file descriptors 0, 1, or 2 is
-associated with a terminal that occurs in this data base)
-it returns 0 on UNIX\ V6 and V7 and BSD-like systems,
-but \-1 on System V-like systems.
-.SH ATTRIBUTES
-For an explanation of the terms used in this section, see
-.BR attributes (7).
-.TS
-allbox;
-lbx lb lb
-l l l.
-Interface	Attribute	Value
-T{
-.na
-.nh
-.BR ttyslot ()
-T}	Thread safety	MT-Unsafe
-.TE
-.SH VERSIONS
-The utmp file is found in various places on various systems, such as
-.IR /etc/utmp ,
-.IR /var/adm/utmp ,
-.IR /var/run/utmp .
-.SH STANDARDS
-None.
-.SH HISTORY
-SUSv1; marked as LEGACY in SUSv2; removed in POSIX.1-2001.
-SUSv2 requires \-1 on error.
-.P
-The glibc2 implementation of this function reads the file
-.BR _PATH_TTYS ,
-defined in
-.I <ttyent.h>
-as "/etc/ttys".
-It returns 0 on error.
-Since Linux systems do not usually have "/etc/ttys", it will
-always return 0.
-.P
-On BSD-like systems and Linux, the declaration of
-.BR ttyslot ()
-is provided by
-.IR <unistd.h> .
-On System V-like systems, the declaration is provided by
-.IR <stdlib.h> .
-Since glibc 2.24,
-.I <stdlib.h>
-also provides the declaration with the following
-feature test macro definitions:
-.P
-.in +4n
-.EX
-(_XOPEN_SOURCE >= 500 ||
-        (_XOPEN_SOURCE && _XOPEN_SOURCE_EXTENDED))
-    && ! (_POSIX_C_SOURCE >= 200112L || _XOPEN_SOURCE >= 600)
-.EE
-.in
-.P
-Minix also has
-.IR fttyslot ( fd ).
-.\" .SH HISTORY
-.\" .BR ttyslot ()
-.\" appeared in UNIX V7.
-.SH SEE ALSO
-.BR getttyent (3),
-.BR ttyname (3),
-.BR utmp (5)