Import /usr/src/bin/kill from FreeBSD 12.1-RELEASE

2 files changed, 372 insertions, 0 deletions

diff --git a/bin/1sh/kill.1 b/bin/1sh/kill.1
new file mode 100644
index 00000000..262cb335
--- /dev/null
+++ b/bin/1sh/kill.1
@@ -0,0 +1,157 @@
+.\"-
+.\" Copyright (c) 1980, 1990, 1993
+.\"	The Regents of the University of California.  All rights reserved.
+.\"
+.\" This code is derived from software contributed to Berkeley by
+.\" the Institute of Electrical and Electronics Engineers, Inc.
+.\"
+.\" 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.
+.\" 3. Neither the name of the University nor the names of its contributors
+.\"    may be used to endorse or promote products derived from this software
+.\"    without specific prior written permission.
+.\"
+.\" 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.
+.\"
+.\"	@(#)kill.1	8.2 (Berkeley) 4/28/95
+.\" $FreeBSD: releng/12.1/bin/kill/kill.1 314436 2017-02-28 23:42:47Z imp $
+.\"
+.Dd October 3, 2016
+.Dt KILL 1
+.Os
+.Sh NAME
+.Nm kill
+.Nd terminate or signal a process
+.Sh SYNOPSIS
+.Nm
+.Op Fl s Ar signal_name
+.Ar pid ...
+.Nm
+.Fl l
+.Op Ar exit_status
+.Nm
+.Fl Ar signal_name
+.Ar pid ...
+.Nm
+.Fl Ar signal_number
+.Ar pid ...
+.Sh DESCRIPTION
+The
+.Nm
+utility sends a signal to the processes specified by the
+.Ar pid
+operands.
+.Pp
+Only the super-user may send signals to other users' processes.
+.Pp
+The options are as follows:
+.Bl -tag -width indent
+.It Fl s Ar signal_name
+A symbolic signal name specifying the signal to be sent instead of the
+default
+.Dv TERM .
+.It Fl l Op Ar exit_status
+If no operand is given, list the signal names; otherwise, write
+the signal name corresponding to
+.Ar exit_status .
+.It Fl Ar signal_name
+A symbolic signal name specifying the signal to be sent instead of the
+default
+.Dv TERM .
+.It Fl Ar signal_number
+A non-negative decimal integer, specifying the signal to be sent instead
+of the default
+.Dv TERM .
+.El
+.Pp
+The following PIDs have special meanings:
+.Bl -tag -width indent
+.It -1
+If superuser, broadcast the signal to all processes; otherwise broadcast
+to all processes belonging to the user.
+.El
+.Pp
+Some of the more commonly used signals:
+.Pp
+.Bl -tag -width indent -compact
+.It 1
+HUP (hang up)
+.It 2
+INT (interrupt)
+.It 3
+QUIT (quit)
+.It 6
+ABRT (abort)
+.It 9
+KILL (non-catchable, non-ignorable kill)
+.It 14
+ALRM (alarm clock)
+.It 15
+TERM (software termination signal)
+.El
+.Pp
+Some shells may provide a builtin
+.Nm
+command which is similar or identical to this utility.
+Consult the
+.Xr builtin 1
+manual page.
+.Sh EXIT STATUS
+.Ex -std
+.Sh EXAMPLES
+Terminate
+the processes with PIDs 142 and 157:
+.Pp
+.Dl "kill 142 157"
+.Pp
+Send the hangup signal
+.Pq Dv SIGHUP
+to the process with PID 507:
+.Pp
+.Dl "kill -s HUP 507"
+.Pp
+Terminate the process group with PGID 117:
+.Pp
+.Dl "kill -- -117"
+.Sh SEE ALSO
+.Xr builtin 1 ,
+.Xr csh 1 ,
+.Xr killall 1 ,
+.Xr ps 1 ,
+.Xr sh 1 ,
+.Xr kill 2 ,
+.Xr sigaction 2
+.Sh STANDARDS
+The
+.Nm
+utility is expected to be
+.St -p1003.2
+compatible.
+.Sh HISTORY
+A
+.Nm
+command appeared in
+.At v3
+in section 8 of the manual.
+.Sh BUGS
+A replacement for the command
+.Dq Li kill 0
+for
+.Xr csh 1
+users should be provided.
diff --git a/bin/1sh/kill.c b/bin/1sh/kill.c
new file mode 100644
index 00000000..15dbc9d2
--- /dev/null
+++ b/bin/1sh/kill.c
@@ -0,0 +1,215 @@
+/*-
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
+ * Copyright (c) 1988, 1993, 1994
+ *	The Regents of the University of California.  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.
+ * 3. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * 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.
+ */
+/*
+ * Important: This file is used both as a standalone program /bin/kill and
+ * as a builtin for /bin/sh (#define SHELL).
+ */
+
+#if 0
+#ifndef lint
+static char const copyright[] =
+"@(#) Copyright (c) 1988, 1993, 1994\n\
+	The Regents of the University of California.  All rights reserved.\n";
+#endif /* not lint */
+
+#ifndef lint
+static char sccsid[] = "@(#)kill.c	8.4 (Berkeley) 4/28/95";
+#endif /* not lint */
+#endif
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD: releng/12.1/bin/kill/kill.c 326025 2017-11-20 19:49:47Z pfg $");
+
+#include <ctype.h>
+#include <err.h>
+#include <errno.h>
+#include <signal.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#ifdef SHELL
+#define main killcmd
+#include "bltin/bltin.h"
+#endif
+
+static void nosig(const char *);
+static void printsignals(FILE *);
+static int signame_to_signum(const char *);
+static void usage(void);
+
+int
+main(int argc, char *argv[])
+{
+	long pidl;
+	pid_t pid;
+	int errors, numsig, ret;
+	char *ep;
+
+	if (argc < 2)
+		usage();
+
+	numsig = SIGTERM;
+
+	argc--, argv++;
+	if (!strcmp(*argv, "-l")) {
+		argc--, argv++;
+		if (argc > 1)
+			usage();
+		if (argc == 1) {
+			if (!isdigit(**argv))
+				usage();
+			numsig = strtol(*argv, &ep, 10);
+			if (!**argv || *ep)
+				errx(2, "illegal signal number: %s", *argv);
+			if (numsig >= 128)
+				numsig -= 128;
+			if (numsig <= 0 || numsig >= sys_nsig)
+				nosig(*argv);
+			printf("%s\n", sys_signame[numsig]);
+			return (0);
+		}
+		printsignals(stdout);
+		return (0);
+	}
+
+	if (!strcmp(*argv, "-s")) {
+		argc--, argv++;
+		if (argc < 1) {
+			warnx("option requires an argument -- s");
+			usage();
+		}
+		if (strcmp(*argv, "0")) {
+			if ((numsig = signame_to_signum(*argv)) < 0)
+				nosig(*argv);
+		} else
+			numsig = 0;
+		argc--, argv++;
+	} else if (**argv == '-' && *(*argv + 1) != '-') {
+		++*argv;
+		if (isalpha(**argv)) {
+			if ((numsig = signame_to_signum(*argv)) < 0)
+				nosig(*argv);
+		} else if (isdigit(**argv)) {
+			numsig = strtol(*argv, &ep, 10);
+			if (!**argv || *ep)
+				errx(2, "illegal signal number: %s", *argv);
+			if (numsig < 0)
+				nosig(*argv);
+		} else
+			nosig(*argv);
+		argc--, argv++;
+	}
+
+	if (argc > 0 && strncmp(*argv, "--", 2) == 0)
+		argc--, argv++;
+
+	if (argc == 0)
+		usage();
+
+	for (errors = 0; argc; argc--, argv++) {
+#ifdef SHELL
+		if (**argv == '%')
+			ret = killjob(*argv, numsig);
+		else
+#endif
+		{
+			pidl = strtol(*argv, &ep, 10);
+			/* Check for overflow of pid_t. */
+			pid = (pid_t)pidl;
+			if (!**argv || *ep || pid != pidl)
+				errx(2, "illegal process id: %s", *argv);
+			ret = kill(pid, numsig);
+		}
+		if (ret == -1) {
+			warn("%s", *argv);
+			errors = 1;
+		}
+	}
+
+	return (errors);
+}
+
+static int
+signame_to_signum(const char *sig)
+{
+	int n;
+
+	if (strncasecmp(sig, "SIG", 3) == 0)
+		sig += 3;
+	for (n = 1; n < sys_nsig; n++) {
+		if (!strcasecmp(sys_signame[n], sig))
+			return (n);
+	}
+	return (-1);
+}
+
+static void
+nosig(const char *name)
+{
+
+	warnx("unknown signal %s; valid signals:", name);
+	printsignals(stderr);
+#ifdef SHELL
+	error(NULL);
+#else
+	exit(2);
+#endif
+}
+
+static void
+printsignals(FILE *fp)
+{
+	int n;
+
+	for (n = 1; n < sys_nsig; n++) {
+		(void)fprintf(fp, "%s", sys_signame[n]);
+		if (n == (sys_nsig / 2) || n == (sys_nsig - 1))
+			(void)fprintf(fp, "\n");
+		else
+			(void)fprintf(fp, " ");
+	}
+}
+
+static void
+usage(void)
+{
+
+	(void)fprintf(stderr, "%s\n%s\n%s\n%s\n",
+		"usage: kill [-s signal_name] pid ...",
+		"       kill -l [exit_status]",
+		"       kill -signal_name pid ...",
+		"       kill -signal_number pid ...");
+#ifdef SHELL
+	error(NULL);
+#else
+	exit(2);
+#endif
+}