Merging upstream version 6.8.

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

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-.\" Copyright (c) 1992 Drew Eckhardt (drew@cs.colorado.edu), March 28, 1992
-.\"
-.\" SPDX-License-Identifier: Linux-man-pages-copyleft
-.\"
-.\" Modified by Michael Haardt <michael@moria.de>
-.\" Modified by Thomas Koenig <ig25@rz.uni-karlsruhe.de>
-.\" Modified 1993-07-23 by Rik Faith <faith@cs.unc.edu>
-.\" Modified 1993-07-25 by Rik Faith <faith@cs.unc.edu>
-.\" Modified 1995-11-01 by Michael Haardt
-.\"  <michael@cantor.informatik.rwth-aachen.de>
-.\" Modified 1996-04-14 by Andries Brouwer <aeb@cwi.nl>
-.\"  [added some polishing contributed by Mike Battersby <mib@deakin.edu.au>]
-.\" Modified 1996-07-21 by Andries Brouwer <aeb@cwi.nl>
-.\" Modified 1997-01-17 by Andries Brouwer <aeb@cwi.nl>
-.\" Modified 2001-12-18 by Andries Brouwer <aeb@cwi.nl>
-.\" Modified 2002-07-24 by Michael Kerrisk <mtk.manpages@gmail.com>
-.\"	Added note on historical rules enforced when an unprivileged process
-.\"	sends a signal.
-.\" Modified 2004-06-16 by Michael Kerrisk <mtk.manpages@gmail.com>
-.\"     Added note on CAP_KILL
-.\" Modified 2004-06-24 by aeb
-.\" Modified, 2004-11-30, after idea from emmanuel.colbus@ensimag.imag.fr
-.\"
-.TH kill 2 2023-10-31 "Linux man-pages 6.7"
-.SH NAME
-kill \- send signal to a process
-.SH LIBRARY
-Standard C library
-.RI ( libc ", " \-lc )
-.SH SYNOPSIS
-.nf
-.B #include <signal.h>
-.P
-.BI "int kill(pid_t " pid ", int " sig );
-.fi
-.P
-.RS -4
-Feature Test Macro Requirements for glibc (see
-.BR feature_test_macros (7)):
-.RE
-.P
-.BR kill ():
-.nf
-    _POSIX_C_SOURCE
-.fi
-.SH DESCRIPTION
-The
-.BR kill ()
-system call
-can be used to send any signal to any process group or process.
-.P
-If \fIpid\fP is positive, then signal \fIsig\fP is sent to the
-process with the ID specified by \fIpid\fP.
-.P
-If \fIpid\fP equals 0, then \fIsig\fP is sent to every process in the
-process group of the calling process.
-.P
-If \fIpid\fP equals \-1, then \fIsig\fP is sent to every process
-for which the calling process has permission to send signals,
-except for process 1 (\fIinit\fP), but see below.
-.P
-If \fIpid\fP is less than \-1, then \fIsig\fP is sent to every process
-in the process group whose ID is \fI\-pid\fP.
-.P
-If \fIsig\fP is 0, then no signal is sent,
-but existence and permission checks are still performed;
-this can be used to check for the existence of a process ID or
-process group ID that the caller is permitted to signal.
-.P
-For a process to have permission to send a signal,
-it must either be privileged (under Linux: have the
-.B CAP_KILL
-capability in the user namespace of the target process),
-or the real or effective user ID of the sending process must equal
-the real or saved set-user-ID of the target process.
-In the case of
-.BR SIGCONT ,
-it suffices when the sending and receiving
-processes belong to the same session.
-(Historically, the rules were different; see NOTES.)
-.SH RETURN VALUE
-On success (at least one signal was sent), zero is returned.
-On error, \-1 is returned, and
-.I errno
-is set to indicate the error.
-.SH ERRORS
-.TP
-.B EINVAL
-An invalid signal was specified.
-.TP
-.B EPERM
-The calling process does not have permission to send the signal
-to any of the target processes.
-.TP
-.B ESRCH
-The target process or process group does not exist.
-Note that an existing process might be a zombie,
-a process that has terminated execution, but
-has not yet been
-.BR wait (2)ed
-for.
-.SH STANDARDS
-POSIX.1-2008.
-.SH HISTORY
-POSIX.1-2001, SVr4, 4.3BSD.
-.SS Linux notes
-Across different kernel versions, Linux has enforced different rules
-for the permissions required for an unprivileged process
-to send a signal to another process.
-.\" In the 0.* kernels things chopped and changed quite
-.\" a bit - MTK, 24 Jul 02
-In Linux 1.0 to 1.2.2, a signal could be sent if the
-effective user ID of the sender matched effective user ID of the target,
-or the real user ID of the sender matched the real user ID of the target.
-From Linux 1.2.3 until 1.3.77, a signal could be sent if the
-effective user ID of the sender matched either the real or effective
-user ID of the target.
-The current rules, which conform to POSIX.1, were adopted
-in Linux 1.3.78.
-.SH NOTES
-The only signals that can be sent to process ID 1, the
-.I init
-process, are those for which
-.I init
-has explicitly installed signal handlers.
-This is done to assure the
-system is not brought down accidentally.
-.P
-POSIX.1 requires that \fIkill(\-1,sig)\fP send \fIsig\fP
-to all processes that the calling process may send signals to,
-except possibly for some implementation-defined system processes.
-Linux allows a process to signal itself, but on Linux the call
-\fIkill(\-1,sig)\fP does not signal the calling process.
-.P
-POSIX.1 requires that if a process sends a signal to itself,
-and the sending thread does not have the signal blocked,
-and no other thread
-has it unblocked or is waiting for it in
-.BR sigwait (3),
-at least one
-unblocked signal must be delivered to the sending thread before the
-.BR kill ()
-returns.
-.SH BUGS
-In Linux 2.6 up to and including Linux 2.6.7,
-there was a bug that meant that when sending signals to a process group,
-.BR kill ()
-failed with the error
-.B EPERM
-if the caller did not have permission to send the signal to \fIany\fP (rather
-than \fIall\fP) of the members of the process group.
-Notwithstanding this error return, the signal was still delivered
-to all of the processes for which the caller had permission to signal.
-.SH SEE ALSO
-.BR kill (1),
-.BR _exit (2),
-.BR pidfd_send_signal (2),
-.BR signal (2),
-.BR tkill (2),
-.BR exit (3),
-.BR killpg (3),
-.BR sigqueue (3),
-.BR capabilities (7),
-.BR credentials (7),
-.BR signal (7)