diff --git a/toolbox/Android.mk b/toolbox/Android.mk
index c53f17d..fb2c5c7 100644
--- a/toolbox/Android.mk
+++ b/toolbox/Android.mk
@@ -1,4 +1,17 @@
 LOCAL_PATH:= $(call my-dir)
+
+common_cflags := \
+    -std=gnu99 \
+    -Werror -Wno-unused-parameter \
+    -include bsd-compatibility.h \
+
+include $(CLEAR_VARS)
+LOCAL_SRC_FILES := upstream-netbsd/bin/kill/kill.c
+LOCAL_CFLAGS += $(common_cflags) -Dmain=kill_main
+LOCAL_MODULE := libtoolbox_kill
+LOCAL_ADDITIONAL_DEPENDENCIES += $(LOCAL_PATH)/Android.mk
+include $(BUILD_STATIC_LIBRARY)
+
 include $(CLEAR_VARS)
 
 TOOLS := \
@@ -24,7 +37,6 @@
 	insmod \
 	ioctl \
 	ionice \
-	kill \
 	ln \
 	load_policy \
 	log \
@@ -79,7 +91,8 @@
 ALL_TOOLS = $(TOOLS)
 ALL_TOOLS += \
 	cp \
-	grep
+	grep \
+	kill \
 
 LOCAL_SRC_FILES := \
 	cp/cp.c \
@@ -94,10 +107,7 @@
 	toolbox.c \
 	uid_from_user.c \
 
-LOCAL_CFLAGS += \
-    -std=gnu99 \
-    -Werror -Wno-unused-parameter \
-    -include bsd-compatibility.h \
+LOCAL_CFLAGS += $(common_cflags)
 
 LOCAL_C_INCLUDES += external/openssl/include
 
@@ -111,6 +121,9 @@
 LOCAL_STATIC_LIBRARIES := \
     libusbhost \
 
+LOCAL_WHOLE_STATIC_LIBRARIES := \
+    libtoolbox_kill \
+
 LOCAL_MODULE := toolbox
 LOCAL_ADDITIONAL_DEPENDENCIES += $(LOCAL_PATH)/Android.mk
 
diff --git a/toolbox/kill.c b/toolbox/kill.c
deleted file mode 100644
index fa2f649..0000000
--- a/toolbox/kill.c
+++ /dev/null
@@ -1,148 +0,0 @@
-#include <stdio.h>
-#include <stdlib.h>
-#include <errno.h>
-
-#include <sys/types.h>
-#include <signal.h>
-
-static struct {
-    unsigned int number;
-    char *name;
-} signals[] = {
-#define _SIG(name) {SIG##name, #name}
-    /* Single Unix Specification signals */
-    _SIG(ABRT),
-    _SIG(ALRM),
-    _SIG(FPE),
-    _SIG(HUP),
-    _SIG(ILL),
-    _SIG(INT),
-    _SIG(KILL),
-    _SIG(PIPE),
-    _SIG(QUIT),
-    _SIG(SEGV),
-    _SIG(TERM),
-    _SIG(USR1),
-    _SIG(USR2),
-    _SIG(CHLD),
-    _SIG(CONT),
-    _SIG(STOP),
-    _SIG(TSTP),
-    _SIG(TTIN),
-    _SIG(TTOU),
-    _SIG(BUS),
-    _SIG(POLL),
-    _SIG(PROF),
-    _SIG(SYS),
-    _SIG(TRAP),
-    _SIG(URG),
-    _SIG(VTALRM),
-    _SIG(XCPU),
-    _SIG(XFSZ),
-    /* non-SUS signals */
-    _SIG(IO),
-    _SIG(PWR),
-#ifdef SIGSTKFLT
-    _SIG(STKFLT),
-#endif
-    _SIG(WINCH),
-#undef _SIG
-};
-
-/* To indicate a matching signal was not found */
-static const unsigned int SENTINEL = (unsigned int) -1;
-
-void list_signals()
-{
-    unsigned int sorted_signals[_NSIG];
-    unsigned int i;
-    unsigned int num;
-
-    memset(sorted_signals, SENTINEL, sizeof(sorted_signals));
-
-    // Sort the signals
-    for (i = 0; i < sizeof(signals)/sizeof(signals[0]); i++) {
-        sorted_signals[signals[i].number] = i;
-    }
-
-    num = 0;
-    for (i = 1; i < _NSIG; i++) {
-        unsigned int index = sorted_signals[i];
-        if (index == SENTINEL) {
-            continue;
-        }
-
-        fprintf(stderr, "%2d) SIG%-9s ", i, signals[index].name);
-
-        if ((num++ % 4) == 3) {
-            fprintf(stderr, "\n");
-        }
-    }
-
-    if ((num % 4) == 3) {
-        fprintf(stderr, "\n");
-    }
-}
-
-unsigned int name_to_signal(const char* name)
-{
-    unsigned int i;
-
-    for (i = 1; i < sizeof(signals) / sizeof(signals[0]); i++) {
-        if (!strcasecmp(name, signals[i].name)) {
-            return signals[i].number;
-        }
-    }
-
-    return SENTINEL;
-}
-
-int kill_main(int argc, char **argv)
-{
-    unsigned int sig = SIGTERM;
-    int result = 0;
-
-    argc--;
-    argv++;
-
-    if (argc >= 1 && argv[0][0] == '-') {
-        char *endptr;
-        size_t arg_len = strlen(argv[0]);
-        if (arg_len < 2) {
-            fprintf(stderr, "invalid argument: -\n");
-            return -1;
-        }
-
-        char* arg = argv[0] + 1;
-        if (arg_len == 2 && *arg == 'l') {
-            list_signals();
-            return 0;
-        }
-
-        sig = strtol(arg, &endptr, 10);
-        if (*endptr != '\0') {
-            sig = name_to_signal(arg);
-            if (sig == SENTINEL) {
-                fprintf(stderr, "invalid signal name: %s\n", arg);
-                return -1;
-            }
-        }
-
-        argc--;
-        argv++;
-    }
-
-    while(argc > 0){
-        int pid = atoi(argv[0]);
-        int err = kill(pid, sig);
-        if (err < 0) {
-            result = err;
-            fprintf(stderr, "could not kill pid %d: %s\n", pid, strerror(errno));
-        }
-
-        argc--;
-        argv++;
-    }
-
-    return result;
-}
diff --git a/toolbox/upstream-netbsd/bin/kill/kill.c b/toolbox/upstream-netbsd/bin/kill/kill.c
new file mode 100644
index 0000000..0592577
--- /dev/null
+++ b/toolbox/upstream-netbsd/bin/kill/kill.c
@@ -0,0 +1,253 @@
+/* $NetBSD: kill.c,v 1.27 2011/08/29 14:51:18 joerg Exp $ */
+
+/*
+ * 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.
+ */
+
+#include <sys/cdefs.h>
+#if !defined(lint) && !defined(SHELL)
+__COPYRIGHT("@(#) Copyright (c) 1988, 1993, 1994\
+ The Regents of the University of California.  All rights reserved.");
+#endif /* not lint */
+
+#ifndef lint
+#if 0
+static char sccsid[] = "@(#)kill.c	8.4 (Berkeley) 4/28/95";
+#else
+__RCSID("$NetBSD: kill.c,v 1.27 2011/08/29 14:51:18 joerg Exp $");
+#endif
+#endif /* not lint */
+
+#include <ctype.h>
+#include <err.h>
+#include <errno.h>
+#include <signal.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <limits.h>
+#include <inttypes.h>
+#include <string.h>
+#include <termios.h>
+#include <unistd.h>
+#include <locale.h>
+#include <sys/ioctl.h>
+
+#ifdef SHELL            /* sh (aka ash) builtin */
+int killcmd(int, char *argv[]);
+#define main killcmd
+#include "../../bin/sh/bltin/bltin.h"
+#endif /* SHELL */ 
+
+__dead static void nosig(char *);
+static void printsignals(FILE *);
+static int signame_to_signum(char *);
+__dead static void usage(void);
+
+int
+main(int argc, char *argv[])
+{
+	int errors;
+	intmax_t numsig, pid;
+	char *ep;
+
+	setprogname(argv[0]);
+	setlocale(LC_ALL, "");
+	if (argc < 2)
+		usage();
+
+	numsig = SIGTERM;
+
+	argc--, argv++;
+	if (strcmp(*argv, "-l") == 0) {
+		argc--, argv++;
+		if (argc > 1)
+			usage();
+		if (argc == 1) {
+			if (isdigit((unsigned char)**argv) == 0)
+				usage();
+			numsig = strtoimax(*argv, &ep, 10);
+			/* check for correctly parsed number */
+			if (*ep != '\0' || numsig == INTMAX_MIN || numsig == INTMAX_MAX) {
+				errx(EXIT_FAILURE, "illegal signal number: %s",
+						*argv);
+				/* NOTREACHED */
+			}
+			if (numsig >= 128)
+				numsig -= 128;
+			/* and whether it fits into signals range */
+			if (numsig <= 0 || numsig >= NSIG)
+				nosig(*argv);
+			printf("%s\n", sys_signame[(int) numsig]);
+			exit(0);
+		}
+		printsignals(stdout);
+		exit(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 == '-') {
+		char *sn = *argv + 1;
+		if (isalpha((unsigned char)*sn)) {
+			if ((numsig = signame_to_signum(sn)) < 0)
+				nosig(sn);
+		} else if (isdigit((unsigned char)*sn)) {
+			numsig = strtoimax(sn, &ep, 10);
+			/* check for correctly parsed number */
+			if (*ep || numsig == INTMAX_MIN || numsig == INTMAX_MAX ) {
+				errx(EXIT_FAILURE, "illegal signal number: %s",
+						sn);
+				/* NOTREACHED */
+			}
+			/* and whether it fits into signals range */
+			if (numsig < 0 || numsig >= NSIG)
+				nosig(sn);
+		} else
+			nosig(sn);
+		argc--, argv++;
+	}
+
+	if (argc == 0)
+		usage();
+
+	for (errors = 0; argc; argc--, argv++) {
+#ifdef SHELL
+		extern int getjobpgrp(const char *);
+		if (*argv[0] == '%') {
+			pid = getjobpgrp(*argv);
+			if (pid == 0) {
+				warnx("illegal job id: %s", *argv);
+				errors = 1;
+				continue;
+			}
+		} else 
+#endif
+		{
+			pid = strtoimax(*argv, &ep, 10);
+			/* make sure the pid is a number and fits into pid_t */
+			if (!**argv || *ep || pid == INTMAX_MIN ||
+				pid == INTMAX_MAX || pid != (pid_t) pid) {
+
+				warnx("illegal process id: %s", *argv);
+				errors = 1;
+				continue;
+			}
+		}
+		if (kill((pid_t) pid, (int) numsig) == -1) {
+			warn("%s", *argv);
+			errors = 1;
+		}
+#ifdef SHELL
+		/* Wakeup the process if it was suspended, so it can
+		   exit without an explicit 'fg'. */
+		if (numsig == SIGTERM || numsig == SIGHUP)
+			kill((pid_t) pid, SIGCONT);
+#endif
+	}
+
+	exit(errors);
+	/* NOTREACHED */
+}
+
+static int
+signame_to_signum(char *sig)
+{
+	int n;
+
+	if (strncasecmp(sig, "sig", 3) == 0)
+		sig += 3;
+	for (n = 1; n < NSIG; n++) {
+		if (!strcasecmp(sys_signame[n], sig))
+			return (n);
+	}
+	return (-1);
+}
+
+static void
+nosig(char *name)
+{
+
+	warnx("unknown signal %s; valid signals:", name);
+	printsignals(stderr);
+	exit(1);
+	/* NOTREACHED */
+}
+
+static void
+printsignals(FILE *fp)
+{
+	int sig;
+	int len, nl;
+	const char *name;
+	int termwidth = 80;
+
+	if (isatty(fileno(fp))) {
+		struct winsize win;
+		if (ioctl(fileno(fp), TIOCGWINSZ, &win) == 0 && win.ws_col > 0)
+			termwidth = win.ws_col;
+	}
+
+	for (len = 0, sig = 1; sig < NSIG; sig++) {
+		name = sys_signame[sig];
+		nl = 1 + strlen(name);
+
+		if (len + nl >= termwidth) {
+			fprintf(fp, "\n");
+			len = 0;
+		} else
+			if (len != 0)
+				fprintf(fp, " ");
+		len += nl;
+		fprintf(fp, "%s", name);
+	}
+	if (len != 0)
+		fprintf(fp, "\n");
+}
+
+static void
+usage(void)
+{
+
+	fprintf(stderr, "usage: %s [-s signal_name] pid ...\n"
+	    "       %s -l [exit_status]\n"
+	    "       %s -signal_name pid ...\n"
+	    "       %s -signal_number pid ...\n",
+	    getprogname(), getprogname(), getprogname(), getprogname());
+	exit(1);
+	/* NOTREACHED */
+}