kill_all: include limits.h for PATH_MAX

Add the new wtmp options and fix some cross references.

ChangeLog

@@ -1,7 +1,121 @@
-commit 809c205c356992145b8781ae07a5d3c98b79a8c9
-Author: Sergei Trofimovich <slyfox@inbox.ru>
+commit caacedc0a82285fb2d25c6d3473f154044c7ad66
+Author: William Hubbs <w.d.hubbs@gmail.com>
 Commit: William Hubbs <w.d.hubbs@gmail.com>
 
+    man: update openrc-shutdown man page
+    
+    Add the new wtmp options and fix some cross references.
+
+commit 84d140a1f6abf95a4170d13527152d3ab14e6613
+Author: William Hubbs <w.d.hubbs@gmail.com>
+Commit: William Hubbs <w.d.hubbs@gmail.com>
+
+    scripts/shutdown: pass --single to openrc-shutdown
+    
+    Sysvinit shutdown has a default of single user mode, but openrc-shutdown
+    makes you choose a default action. Because of this, the shutdown wrapper
+    needs to pass --single to openrc-shutdown.
+
+commit ee886c44824b1dd892eaff2c6da666286e61bc73
+Author: William Hubbs <w.d.hubbs@gmail.com>
+Commit: William Hubbs <w.d.hubbs@gmail.com>
+
+    openrc-shutdown: add --single option and clean up option processing
+
+commit 1801561c2d36c330df7fd02c7508f503a61ff5ba
+Author: William Hubbs <w.d.hubbs@gmail.com>
+Commit: William Hubbs <w.d.hubbs@gmail.com>
+
+    init.d/bootmisc: use openrc-shutdown instead of halt to write halt record
+    
+    This fixes #139 and fixes #128.
+    and fixes #124.
+
+commit 7689106aa10f7852b707b4c21ec080ccb2767280
+Author: William Hubbs <w.d.hubbs@gmail.com>
+Commit: William Hubbs <w.d.hubbs@gmail.com>
+
+    add support for writing reboot and shutdown records to wtmp
+
+commit 1564e155b726308200ecd5df315c002bd8b16952
+Author: William Hubbs <w.d.hubbs@gmail.com>
+Commit: William Hubbs <w.d.hubbs@gmail.com>
+
+    openrc-init: add optional sysvinit compatibility
+
+commit 44bac3c3798f7eb9186c3ea8774552aa191bfae7
+Author: William Hubbs <w.d.hubbs@gmail.com>
+Commit: William Hubbs <w.d.hubbs@gmail.com>
+
+    Change killprocs to use kill_all instead of killall5
+    
+    X-Gentoo-Bug:376977
+    X-Gentoo-Bug-URL:https://bugs.gentoo.org/show_bug.cgi?id=376977
+
+commit 0ddee9b7d2b8dea810e252ca6a95c457876df120
+Author: Sergei Trofimovich <slyfox@gentoo.org>
+Commit: William Hubbs <w.d.hubbs@gmail.com>
+
+    openrc-init: fix buffer overflow in init.ctl
+    
+    How to reproduce 1-byte overflow:
+    
+    ```
+    $ FEATURES=-test CFLAGS="-fsanitize=address -O0 -ggdb3" emerge -1 openrc
+    
+    =================================================================
+    ==1==ERROR: AddressSanitizer: stack-buffer-overflow on address 0x7fff0efd8710
+        at pc 0x000000402076 bp 0x7fff0efd7d50 sp 0x7fff0efd7d40
+    WRITE of size 1 at 0x7fff0efd8710 thread T0
+        #0 0x402075  (/sbin/openrc-init+0x402075)
+        #1 0x3cf6e2070f in __libc_start_main (/lib64/libc.so.6+0x3cf6e2070f)
+        #2 0x4013b8  (/sbin/openrc-init+0x4013b8)
+    
+    Address 0x7fff0efd8710 is located in stack of thread T0 at offset 2432 in frame
+        #0 0x401cfb  (/sbin/openrc-init+0x401cfb)
+    
+      This frame has 3 object(s):
+        [32, 160) 'signals'
+        [192, 344) 'sa'
+        [384, 2432) 'buf' <== Memory access at offset 2432 overflows this variable
+    HINT: this may be a false positive if your program uses some custom stack unwind mechanism or swapcontext
+          (longjmp and C++ exceptions *are* supported)
+    SUMMARY: AddressSanitizer: stack-buffer-overflow ??:0 ??
+    ```
+    
+    The problem here is in the code handling reads from 'init.ctl':
+    
+    ```
+    int main(int argc, char **argv) {
+    ...
+        char buf[2048];
+        for (;;) {
+            /* This will block until a command is sent down the pipe... */
+            fifo = fopen(RC_INIT_FIFO, "r");
+            count = fread(buf, 1, 2048, fifo);
+            buf[count] = 0;
+            ...
+        }
+    ```
+    
+    `buf[count] = 0;` writes outside the buffer when `fread()` returns non-truncated read.
+    
+    This fixes #138.
+
+commit 688566c535111a141f77caf88db12a4338544f7b
+Author: Sergei Trofimovich <slyfox@inbox.ru>
+Commit: Doug Freed <dwfreed@mtu.edu>
+
+    mk/cc.mk: make implicit function declarations fatal (#136)
+    
+    Avoids issues with missing prototypes causing truncation of pointers.
+    
+    Signed-off-by: Sergei Trofimovich <slyfox@gentoo.org>
+
+commit 7185e242ffaa8cd1b672fe4726502a196fd779c2
+Author: Sergei Trofimovich <slyfox@inbox.ru>
+Commit: Doug Freed <dwfreed@mtu.edu>
+
     rc-logger.c: fix crash on fclose(NULL) (#137)
     
     Only close the log if we successfully opened it.
@@ -10,47 +124,64 @@ Commit: William Hubbs <w.d.hubbs@gmail.com>
     Tested-by: Brian Evans <grknight@gentoo.org>
     Signed-off-by: Sergei Trofimovich <slyfox@gentoo.org>
 
-commit 238bffca9bbec8ed723b9e46fbc04407e5daddeb
+commit ec27299f4b88daa80261298fafea76ae634744d9
 Author: William Hubbs <w.d.hubbs@gmail.com>
 Commit: William Hubbs <w.d.hubbs@gmail.com>
 
-    version 0.26.3
+    typo fix
+    
+    X-Gentoo-Bug: 618888
+    X-Gentoo-Bug-URL: https://bugs.gentoo.org/show_bug.cgi?id=618888
 
-commit da0ddd521ad15d030308fbf2017577acc422f1d6
+commit 1ece16bfcd0ab71d2f9fe17a75ee6184e0fa4828
 Author: William Hubbs <w.d.hubbs@gmail.com>
 Commit: William Hubbs <w.d.hubbs@gmail.com>
 
-    update ChangeLog
+    openrc-shutdown: add dry-run option
 
-commit 1967cd402caf6e229263f15aef40c6c4d8f60ce3
+commit 0cfd0dd9ef580ed9dc563ccc164d70efe8f299db
+Author: William Hubbs <w.d.hubbs@gmail.com>
+Commit: William Hubbs <w.d.hubbs@gmail.com>
+
+    openrc-shutdown: move to single user mode by default
+    
+    To be more compatible with sysvinit, move to single user mode if no
+    options are specified on the command line.
+
+commit a77ee2e94191ba1a286b8a6835f76556481566ba
+Author: William Hubbs <w.d.hubbs@gmail.com>
+Commit: William Hubbs <w.d.hubbs@gmail.com>
+
+    init: add ability to switch to single user mode
+
+commit 49b8a573a195f4b2cee992cd10678694da0a6f4f
+Author: William Hubbs <w.d.hubbs@gmail.com>
+Commit: William Hubbs <w.d.hubbs@gmail.com>
+
+    add kill_all helper
+    
+    This is similar to the sysvinit killall5 utility.  It should only be used
+    in service scripts, so it will not be installed in the path.
+    
+    This closes #129.
+
+commit a2055af90054f5125cc07d4851b1dc9d16815e7c
 Author: William Hubbs <w.d.hubbs@gmail.com>
 Commit: William Hubbs <w.d.hubbs@gmail.com>
 
     rc_status: calculate time differences in time_t and display seconds in uptime
 
-commit a7f3eb466c750eee160c49ab728ad1f8cd3380ee
-Author: William Hubbs <w.d.hubbs@gmail.com>
-Commit: William Hubbs <w.d.hubbs@gmail.com>
-
-    version 0.26.2
-
-commit ae7490929d35322e1ce19daaa9f1edadbfe8dfd6
-Author: William Hubbs <w.d.hubbs@gmail.com>
-Commit: William Hubbs <w.d.hubbs@gmail.com>
-
-    update ChangeLog
-
-commit ddbd1caa35986b9f1be0070dad1cedfc427a1bf1
+commit cbf96967f1b6dc72ae16203dfbbb844bd08e8b6b
 Author: William Hubbs <w.d.hubbs@gmail.com>
 Commit: William Hubbs <w.d.hubbs@gmail.com>
 
     supervise-daemon: save start time and respawn count before dropping privs
 
-commit a24965121834b64cc5e62c52c67b88886e5c5f5c
+commit f1013037b47cdd6344f1b3ed92b7f84d7fcca01f
 Author: William Hubbs <w.d.hubbs@gmail.com>
 Commit: William Hubbs <w.d.hubbs@gmail.com>
 
-    version 0.26.1
+    version 0.27
 
 commit e4bfb4530a86a4ccdff312c857df37fa0da36fd6
 Author: William Hubbs <w.d.hubbs@gmail.com>

Makefile.inc

@@ -1,3 +1,3 @@
 NAME=		openrc
-VERSION=	0.26.3
+VERSION=	0.27.1
 PKG=		${NAME}-${VERSION}

README.md

@@ -28,6 +28,7 @@ MKPREFIX=yes
 MKPKGCONFIG=no
 MKSELINUX=yes
 MKSTATICLIBS=no
+MKSYSVINIT=yes
 MKTERMCAP=ncurses
 MKTERMCAP=termcap
 PKG_PREFIX=/usr/pkg

conf.d/agetty

@@ -2,7 +2,7 @@
 #baud=""
 
 # set the terminal type
-#termtype="linux"
+#term_type="linux"
 
 # extra options to pass to agetty for this port
 #agetty_options=""

conf.d/killprocs

@@ -1,3 +1,6 @@
-# If you wish to pass any options to killall5 during shutdown,
+# If you wish to pass any options to kill_all during shutdown,
 # you should do so here.
+#
+# The setting is called killall5_opts because the options here are meant
+# to be identical to those you could pass to killall5.
 killall5_opts=""

init.d/agetty.in

@@ -14,7 +14,7 @@ supervisor=supervise-daemon
 port="${RC_SVCNAME#*.}"
 term_type="${term_type:-linux}"
 command=/sbin/agetty
-command_args_foreground="${agetty_options} ${port} ${baud} ${termtype}"
+command_args_foreground="${agetty_options} ${port} ${baud} ${term_type}"
 pidfile="/run/${RC_SVCNAME}.pid"
 
 depend() {

init.d/bootmisc.in

@@ -241,7 +241,7 @@ stop()
 {
 	# Write a halt record if we're shutting down
 	if [ "$RC_RUNLEVEL" = shutdown ]; then
-		[ "$RC_UNAME" = Linux ] && halt -w
+		[ "$RC_UNAME" = Linux ] && openrc-shutdown -w
 		if [ "$RC_SYS" = OPENVZ ]; then
 			yesno $RC_REBOOT && printf "" >/reboot
 		fi

init.d/killprocs.in

@@ -19,9 +19,9 @@ depend()
 start()
 {
 	ebegin "Terminating remaining processes"
-	killall5 -15 ${killall5_opts}
+	kill_all 15 ${killall5_opts}
 	eend 0
 	ebegin "Killing remaining processes"
-	killall5 -9 ${killall5_opts}
+	kill_all 9 ${killall5_opts}
 	eend 0
 }

man/openrc-shutdown.8

@@ -8,7 +8,7 @@
 .\" This file may not be copied, modified, propagated, or distributed
 .\"    except according to the terms contained in the LICENSE file.
 .\"
-.Dd April 6, 2017
+.Dd May 22, 2017
 .Dt openrc-shutdown 8 SMM
 .Os OpenRC
 .Sh NAME
@@ -16,22 +16,33 @@
 .Nd bring the system down
 .Sh SYNOPSIS
 .Nm
+.Op Fl d , -no-write
+.Op Fl D , -dry-run
 .Op Fl H , -halt
 .Op Fl k , -kexec
 .Op Fl p , -poweroff
 .Op Fl R , -reexec
 .Op Fl r , -reboot
+.Op Fl s , -single
+.Op Fl w , -write-only
 .Sh DESCRIPTION
 .Nm
-is the utility that communicates with openrc-init(8) to bring down the
-system or instruct openrc-init to re-execute itself. It supports the
-following options:
+is the utility that communicates with
+.Xr openrc-init 8
+to bring down the system or instruct openrc-init to re-execute itself.
+It supports the following options:
 .Bl -tag -width "poweroff"
+.It Fl d , -no-write
+Do not write the wtmp boot record.
+.It Fl D , -dry-run
+Print the action that would be taken without executing it. This is to
+allow testing.
 .It Fl H , -halt
 Stop all services, kill all remaining processes and halt the system.
 .It Fl k , -kexec
 Stop all services, kill all processes and boot directly into a new
-kernel loaded via kexec(8).
+kernel loaded via
+.Xr kexec 8 .
 .It Fl p , -poweroff
 Stop all services, kill all processes and power off the system.
 .It Fl R , -reexec
@@ -39,6 +50,10 @@ instruct openrc-init to re-exec itself. This should be used after an
 upgrade of OpenRC if you are using openrc-init as your init process.
 .It Fl r , -reboot
 Stop all services, kill all processes and reboot the system.
+.It Fl s , -single
+Stop all services, kill all processes and move to single user mode.
+.It Fl w , -write-only
+Stop all services, kill all processes and move to single user mode.
 .El
 .Sh SEE ALSO
 .Xr openrc-init 8 ,

mk/cc.mk

@@ -26,7 +26,8 @@ _CCFLAGS=	-Wall -Wextra -Wimplicit -Wshadow -Wformat=2 \
 		-Wnested-externs \
 		-Winline -Wwrite-strings -Wcast-align -Wcast-qual \
 		-Wpointer-arith \
-		-Wdeclaration-after-statement -Wsequence-point
+		-Wdeclaration-after-statement -Wsequence-point \
+		-Werror=implicit-function-declaration
 
 # We should be using -Wredundant-decls, but our library hidden proto stuff
 # gives loads of warnings. I don't fully understand it (the hidden proto,

scripts/.gitignore

@@ -1 +1,5 @@
+halt
+poweroff
 rc-sstat
+reboot
+shutdown

scripts/Makefile

@@ -8,12 +8,23 @@ INSTALLAFTER = _installafter
 ifeq (${OS},Linux)
 SRCS+= rc-sstat.in
 BIN+=	rc-sstat
+ifeq (${MKSYSVINIT},yes)
+SRCS+= halt.in poweroff.in reboot.in shutdown.in
+BIN+=	halt poweroff reboot shutdown
+	endif
 endif
 
 _installafter:
 ifeq (${OS},Linux)
 	${INSTALL} -d ${DESTDIR}${SBINDIR}
-	ln -sf ${DIR}/rc-sstat ${DESTDIR}/${SBINDIR}/rc-sstat
+	ln -sf ../${DIR}/rc-sstat ${DESTDIR}/${SBINDIR}/rc-sstat
+ifeq (${MKSYSVINIT},yes)
+	ln -sf	../${DIR}/halt ${DESTDIR}/sbin/halt
+	ln -sf	../${DIR}/poweroff ${DESTDIR}/sbin/poweroff
+	ln -sf	../${DIR}/reboot ${DESTDIR}/sbin/reboot
+	ln -sf	../${DIR}/shutdown ${DESTDIR}/sbin/shutdown
+	ln -sf	openrc-init ${DESTDIR}/sbin/init
+endif
 endif
 
 include ${MK}/scripts.mk

scripts/halt.in

@@ -0,0 +1,3 @@
+#!@SHELL@
+
+exec @SBINDIR@/openrc-shutdown --halt "$@"

scripts/poweroff.in

@@ -0,0 +1,3 @@
+#!@SHELL@
+
+exec @SBINDIR@/openrc-shutdown --poweroff "$@"

scripts/reboot.in

@@ -0,0 +1,3 @@
+#!@SHELL@
+
+exec @SBINDIR@/openrc-shutdown --reboot "$@"

scripts/shutdown.in

@@ -0,0 +1,8 @@
+#!@SHELL@
+
+args="$@"
+case "$@" in
+	*--single*|*-s*) args="$@" ;;
+	*) args="--single $@";;
+esac
+exec @SBINDIR@/openrc-shutdown "$args"

src/includes/rc-wtmp.h

@@ -0,0 +1,26 @@
+/*
+ * rc-wtmp.h
+ * This is private to us and not for user consumption
+*/
+
+/*
+ * Copyright (c) 2017 The OpenRC Authors.
+ * See the Authors file at the top-level directory of this distribution and
+ * https://github.com/OpenRC/openrc/blob/master/AUTHORS
+ *
+ * This file is part of OpenRC. It is subject to the license terms in
+ * the LICENSE file found in the top-level directory of this
+ * distribution and at https://github.com/OpenRC/openrc/blob/master/LICENSE
+ * This file may not be copied, modified, propagated, or distributed
+ *    except according to the terms contained in the LICENSE file.
+ */
+
+#ifndef __RC_WTMP_H__
+#define __RC_WTMP_H__
+
+#include <utmp.h>
+
+void log_wtmp(const char *user, const char *id, pid_t pid, int type,
+		const char *line);
+
+#endif

src/rc/.gitignore

@@ -62,3 +62,4 @@ openrc
 openrc-init
 openrc-run
 openrc-shutdown
+kill_all

src/rc/Makefile

@@ -14,7 +14,7 @@ SRCS+=		rc-selinux.c
 endif
 
 ifeq (${OS},Linux)
-SRCS+=		openrc-init.c openrc-shutdown.c
+SRCS+=		kill_all.c openrc-init.c openrc-shutdown.c rc-wtmp.c
 endif
 
 CLEANFILES=	version.h rc-selinux.o
@@ -44,6 +44,7 @@ RC_SBINPROGS=	mark_service_starting mark_service_started \
 		rc-abort swclock
 
 ifeq (${OS},Linux)
+RC_BINPROGS+= kill_all
 SBINPROGS+= openrc-init openrc-shutdown
 endif
 
@@ -99,6 +100,9 @@ checkpath: rc-selinux.o
 endif
 	${CC} ${LOCAL_CFLAGS} ${LOCAL_LDFLAGS} ${CFLAGS} ${LDFLAGS} -o $@ $^ ${LDADD}
 
+kill_all: kill_all.o _usage.o
+	${CC} ${LOCAL_CFLAGS} ${LOCAL_LDFLAGS} ${CFLAGS} ${LDFLAGS} -o $@ $^ ${LDADD}
+
 einfon einfo ewarnn ewarn eerrorn eerror ebegin eend ewend \
 eindent eoutdent esyslog eval_ecolors ewaitfile \
 veinfo vewarn vebegin veend vewend veindent veoutdent: do_e.o rc-misc.o
@@ -107,7 +111,7 @@ veinfo vewarn vebegin veend vewend veindent veoutdent: do_e.o rc-misc.o
 fstabinfo: fstabinfo.o _usage.o rc-misc.o
 	${CC} ${LOCAL_CFLAGS} ${LOCAL_LDFLAGS} ${CFLAGS} ${LDFLAGS} -o $@ $^ ${LDADD}
 
-openrc-init: openrc-init.o
+openrc-init: openrc-init.o rc-wtmp.o
 	${CC} ${LOCAL_CFLAGS} ${LOCAL_LDFLAGS} ${CFLAGS} ${LDFLAGS} -o $@ $^ ${LDADD}
 
 is_newer_than: is_newer_than.o rc-misc.o
@@ -128,7 +132,7 @@ mountinfo: mountinfo.o _usage.o rc-misc.o
 openrc rc: rc.o rc-logger.o rc-misc.o rc-plugin.o _usage.o
 	${CC} ${LOCAL_CFLAGS} ${LOCAL_LDFLAGS} ${CFLAGS} ${LDFLAGS} -o $@ $^ ${LDADD}
 
-openrc-shutdown: openrc-shutdown.o _usage.o
+openrc-shutdown: openrc-shutdown.o _usage.o rc-wtmp.o
 	${CC} ${LOCAL_CFLAGS} ${LOCAL_LDFLAGS} ${CFLAGS} ${LDFLAGS} -o $@ $^ ${LDADD}
 
 openrc-run runscript: openrc-run.o _usage.o rc-misc.o rc-plugin.o

src/rc/kill_all.c

@@ -0,0 +1,251 @@
+/*
+ * kill_all.c
+ * Sends a signal to all processes on the system.
+ */
+
+/*
+ * Copyright (c) 2017 The OpenRC Authors.
+ * See the Authors file at the top-level directory of this distribution and
+ * https://github.com/OpenRC/openrc/blob/master/AUTHORS
+ *
+ * This file is part of OpenRC. It is subject to the license terms in
+ * the LICENSE file found in the top-level directory of this
+ * distribution and at https://github.com/OpenRC/openrc/blob/master/LICENSE
+ * This file may not be copied, modified, propagated, or distributed
+ *    except according to the terms contained in the LICENSE file.
+ */
+
+
+#include <dirent.h>
+#include <errno.h>
+#include <getopt.h>
+#include <limits.h>
+#include <signal.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <syslog.h>
+#include <unistd.h>
+#include <sys/types.h>
+#include <sys/wait.h>
+
+#include "einfo.h"
+#include "rc.h"
+#include "rc-misc.h"
+#include "_usage.h"
+
+const char *applet = NULL;
+const char *extraopts = "[signal number]";
+const char *getoptstring = "do:" getoptstring_COMMON;
+const struct option longopts[] = {
+	{ "dry-run",        0, NULL, 'd' },
+	{ "omit",        1, NULL, 'o' },
+	longopts_COMMON
+};
+const char * const longopts_help[] = {
+	"print what would be done",
+	"omit this pid (can be repeated)",
+	longopts_help_COMMON
+};
+const char *usagestring = NULL;
+
+static int mount_proc(void)
+{
+	pid_t pid;
+	pid_t rc;
+	int status;
+
+	if (exists("/proc/version"))
+		return 0;
+	pid = fork();
+	switch(pid) {
+		case -1:
+			syslog(LOG_ERR, "Unable to fork");
+			return -1;
+			break;
+		case 0:
+			/* attempt to mount /proc */
+			execl("mount", "mount", "-t", "proc", "proc", "/proc", NULL);
+			syslog(LOG_ERR, "Unable to execute mount");
+			exit(1);
+			break;
+		default:
+			/* wait for child process */
+			while ((rc = wait(&status)) != pid)
+				if (rc < 0 && errno == ECHILD)
+					break;
+			if (rc != pid || WEXITSTATUS(status) != 0)
+				syslog(LOG_ERR, "mount returned non-zero exit status");
+			break;
+	}
+	if (! exists("/proc/version")) {
+		syslog(LOG_ERR, "Could not mount /proc");
+		return -1;
+	}
+	return 0;
+}
+
+static bool is_user_process(pid_t pid)
+{
+	char buf[PATH_MAX+1];
+	FILE *fp;
+	char path[PATH_MAX+1];
+	pid_t temp_pid;
+	bool user_process = true;
+
+	while (pid >0 && user_process) {
+		if (pid == 2) {
+			user_process = false;
+			continue;
+		}
+		snprintf(path, sizeof(path), "/proc/%d/status", pid);
+		fp = fopen(path, "r");
+		/*
+		 * if we could not open the file, the process disappeared, which
+		 * leaves us no way to determine for sure whether it was a user
+		 * process or kernel thread, so we say it is a kernel thread to
+		 * avoid accidentally killing it.
+		 */
+		if (!fp) {
+			user_process = false;
+			continue;
+		}
+		temp_pid = -1;
+		while (! feof(fp)) {
+			buf[0] = 0;
+			if (fgets(buf, sizeof(buf), fp))
+				sscanf(buf, "PPid: %d", &temp_pid);
+			else
+				break;
+		}
+		fclose(fp);
+		if (temp_pid == -1) {
+			syslog(LOG_ERR, "Unable to read pid from /proc/%d/status", pid);
+			user_process = false;
+			continue;
+		}
+		pid = temp_pid;
+	}
+	return user_process;
+}
+
+static int signal_processes(int sig, RC_STRINGLIST *omits, bool dryrun)
+{
+	sigset_t signals;
+	sigset_t oldsigs;
+	DIR *dir;
+	struct dirent	*d;
+	char buf[PATH_MAX+1];
+	pid_t pid;
+	int sendcount = 0;
+
+	kill(-1, SIGSTOP);
+	sigfillset(&signals);
+	sigemptyset(&oldsigs);
+	sigprocmask(SIG_SETMASK, &signals, &oldsigs);
+	/*
+	 * Open the /proc directory.
+	 * CWD must be /proc to avoid problems if / is affected by the killing
+	 * (i.e. depends on fuse).
+	 */
+	if (chdir("/proc") == -1) {
+		syslog(LOG_ERR, "chdir /proc failed");
+		sigprocmask(SIG_SETMASK, &oldsigs, NULL);
+		kill(-1, SIGCONT);
+		return -1;
+	}
+	dir = opendir(".");
+	if (!dir) {
+		syslog(LOG_ERR, "cannot opendir(/proc)");
+		sigprocmask(SIG_SETMASK, &oldsigs, NULL);
+		kill(-1, SIGCONT);
+		return -1;
+	}
+
+	/* Walk through the directory. */
+	while ((d = readdir(dir)) != NULL) {
+		/* Is this a process? */
+		pid = (pid_t) atoi(d->d_name);
+		if (pid == 0)
+			continue;
+
+		/* Is this a process we have been requested to omit? */
+		sprintf(buf, "%d", pid);
+		if (rc_stringlist_find(omits, buf))
+			continue;
+
+		/* Is this process in our session? */
+		if (getsid(getpid()) == getsid(pid))
+			continue;
+
+		/* Is this a kernel thread? */
+		if (!is_user_process(pid))
+			continue;
+
+		if (dryrun)
+			einfo("Would send signal %d to process %d", sig, pid);
+		else if (kill(pid, sig) == 0)
+			sendcount++;
+	}
+	closedir(dir);
+	sigprocmask(SIG_SETMASK, &oldsigs, NULL);
+	kill(-1, SIGCONT);
+	return sendcount;
+}
+
+int main(int argc, char **argv)
+{
+	char *arg = NULL;
+	int opt;
+	bool dryrun = false;
+	RC_STRINGLIST *omits = rc_stringlist_new();
+	int sig = SIGKILL;
+	char *here;
+	char *token;
+
+	/* Ensure that we are only quiet when explicitly told to be */
+	unsetenv("EINFO_QUIET");
+
+	applet = basename_c(argv[0]);
+	rc_stringlist_addu(omits, "1");
+	while ((opt = getopt_long(argc, argv, getoptstring,
+		    longopts, (int *) 0)) != -1)
+	{
+		switch (opt) {
+			case 'd':
+				dryrun = true;
+				break;
+			case 'o':
+				here = optarg;
+				while ((token = strsep(&here, ",;:"))) {
+					if ((pid_t) atoi(token) > 0)
+						rc_stringlist_addu(omits, token);
+					else {
+						eerror("Invalid omit pid value %s", token);
+						usage(EXIT_FAILURE);
+					}
+				}
+				break;
+			case_RC_COMMON_GETOPT
+		}
+	}
+
+	if (argc > optind) {
+	arg = argv[optind];
+	sig = atoi(arg);
+	if (sig <= 0 || sig > 31) {
+		rc_stringlist_free(omits);
+		eerror("Invalid signal %s", arg);
+		usage(EXIT_FAILURE);
+	}
+	}
+	
+	openlog(applet, LOG_CONS|LOG_PID, LOG_DAEMON);
+	if (mount_proc() != 0) {
+		rc_stringlist_free(omits);
+		eerrorx("Unable to mount /proc file system");
+	}
+	signal_processes(sig, omits, dryrun);
+	rc_stringlist_free(omits);
+	return 0;
+}

src/rc/openrc-init.c

@@ -32,6 +32,7 @@
 
 #include "helpers.h"
 #include "rc.h"
+#include "rc-wtmp.h"
 #include "version.h"
 
 static const char *rc_default_runlevel = "default";
@@ -82,6 +83,7 @@ static void init(const char *default_runlevel)
 	}
 	pid = do_openrc(runlevel);
 	waitpid(pid, NULL, 0);
+	log_wtmp("reboot", "~~", 0, RUN_LVL, "~~");
 }
 
 static void handle_reexec(char *my_name)
@@ -105,6 +107,14 @@ static void handle_shutdown(const char *runlevel, int cmd)
 	reboot(cmd);
 }
 
+static void handle_single(void)
+{
+	pid_t pid;
+
+	pid = do_openrc("single");
+	while (waitpid(pid, NULL, 0) != pid);
+}
+
 static void reap_zombies(void)
 {
 	pid_t pid;
@@ -187,7 +197,7 @@ int main(int argc, char **argv)
 				perror("fopen");
 			continue;
 		}
-		count = fread(buf, 1, 2048, fifo);
+		count = fread(buf, 1, sizeof(buf) - 1, fifo);
 		buf[count] = 0;
 		fclose(fifo);
 		printf("PID1: Received \"%s\" from FIFO...\n", buf);
@@ -201,6 +211,8 @@ int main(int argc, char **argv)
 			handle_shutdown("reboot", RB_AUTOBOOT);
 		else if (strcmp(buf, "reexec") == 0)
 			handle_reexec(argv[0]);
+		else if (strcmp(buf, "single") == 0)
+			handle_single();
 	}
 	return 0;
 }

src/rc/openrc-shutdown.c

@@ -27,42 +27,67 @@
 #include <string.h>
 #include <unistd.h>
 #include <sys/types.h>
+#include <sys/utsname.h>
 
 #include "einfo.h"
 #include "rc.h"
 #include "helpers.h"
 #include "_usage.h"
+#include "rc-wtmp.h"
 
 const char *applet = NULL;
 const char *extraopts = NULL;
-const char *getoptstring = "HkpRr" getoptstring_COMMON;
+const char *getoptstring = "dDHKpRrsw" getoptstring_COMMON;
 const struct option longopts[] = {
+	{ "no-write",        no_argument, NULL, 'd'},
+	{ "dry-run",        no_argument, NULL, 'D'},
 	{ "halt",        no_argument, NULL, 'H'},
-	{ "kexec",        no_argument, NULL, 'k'},
+	{ "kexec",        no_argument, NULL, 'K'},
 	{ "poweroff",        no_argument, NULL, 'p'},
 	{ "reexec",        no_argument, NULL, 'R'},
 	{ "reboot",        no_argument, NULL, 'r'},
+	{ "single",        no_argument, NULL, 's'},
+	{ "write-only",        no_argument, NULL, 'w'},
 	longopts_COMMON
 };
 const char * const longopts_help[] = {
+	"do not write wtmp record",
+	"print actions instead of executing them",
 	"halt the system",
 	"reboot the system using kexec",
 	"power off the system",
 	"re-execute init (use after upgrading)",
 	"reboot the system",
+	"single user mode",
+	"write wtmp boot record and exit",
 	longopts_help_COMMON
 };
 const char *usagestring = NULL;
 const char *exclusive = "Select one of "
-"--halt, --kexec, --poweroff, --reexec or --reboot";
+"--halt, --kexec, --poweroff, --reexec, --reboot, --single or --write-only";
+
+static bool do_dryrun = false;
+static bool do_halt = false;
+static bool do_kexec = false;
+static bool do_poweroff = false;
+static bool do_reboot = false;
+static bool do_reexec = false;
+static bool do_single = false;
+static bool do_wtmp = true;
+static bool do_wtmp_only = false;
 
 static void send_cmd(const char *cmd)
 {
 	FILE *fifo;
  	size_t ignored;
 
+	if (do_dryrun) {
+		einfo("Would send %s to init", cmd);
+		return;
+	}
+	if (do_wtmp && (do_halt || do_kexec || do_reboot || do_poweroff))
+		log_wtmp("shutdown", "~~", 0, RUN_LVL, "~~");
 	fifo = fopen(RC_INIT_FIFO, "w");
-
 	if (!fifo) {
 		perror("fopen");
 		return;
@@ -78,24 +103,23 @@ int main(int argc, char **argv)
 {
 	int opt;
 	int cmd_count = 0;
-	bool do_halt = false;
-	bool do_kexec = false;
-	bool do_poweroff = false;
-	bool do_reboot = false;
-	bool do_reexec = false;
 
 	applet = basename_c(argv[0]);
-if (geteuid() != 0)
-	eerrorx("%s: you must be root\n", applet);
 	while ((opt = getopt_long(argc, argv, getoptstring,
 		    longopts, (int *) 0)) != -1)
 	{
 		switch (opt) {
+			case 'd':
+				do_wtmp = false;
+				break;
+		case 'D':
+			do_dryrun = true;
+			break;
 		case 'H':
 			do_halt = true;
 			cmd_count++;
 			break;
-		case 'k':
+		case 'K':
 			do_kexec = true;
 			cmd_count++;
 			break;
@@ -111,9 +135,19 @@ if (geteuid() != 0)
 			do_reboot = true;
 			cmd_count++;
 			break;
+		case 's':
+			do_single = true;
+			cmd_count++;
+			break;
+		case 'w':
+			do_wtmp_only = true;
+			cmd_count++;
+			break;
 		case_RC_COMMON_GETOPT
 		}
 	}
+	if (geteuid() != 0 && ! do_dryrun)
+		eerrorx("%s: you must be root\n", applet);
 	if (cmd_count != 1) {
 		eerror("%s: %s\n", applet, exclusive);
 		usage(EXIT_FAILURE);
@@ -128,5 +162,9 @@ if (geteuid() != 0)
 		send_cmd("reboot");
 	else if (do_reexec)
 		send_cmd("reexec");
+	else if (do_wtmp_only)
+		log_wtmp("shutdown", "~~", 0, RUN_LVL, "~~");
+	else if (do_single)
+		send_cmd("single");
 	return 0;
 }

src/rc/rc-wtmp.c

@@ -0,0 +1,51 @@
+/*
+ * rc-wtmp.c
+ * This file contains routines to deal with the wtmp file.
+ */
+
+/*
+ * Copyright 2017 The OpenRC Authors.
+ * See the Authors file at the top-level directory of this distribution and
+ * https://github.com/OpenRC/openrc/blob/master/AUTHORS
+ *
+ * This file is part of OpenRC. It is subject to the license terms in
+ * the LICENSE file found in the top-level directory of this
+ * distribution and at https://github.com/OpenRC/openrc/blob/master/LICENSE
+ * This file may not be copied, modified, propagated, or distributed
+ *    except according to the terms contained in the LICENSE file.
+ */
+
+#include <stdbool.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <sys/time.h>
+#include <sys/types.h>
+#include <sys/utsname.h>
+
+#include "rc-wtmp.h"
+
+void log_wtmp(const char *user, const char *id, pid_t pid, int type,
+		const char *line)
+{
+	struct timeval tv;
+	struct utmp utmp;
+	struct utsname uname_buf;
+
+	memset(&utmp, 0, sizeof(utmp));
+	gettimeofday(&tv, NULL);
+	utmp.ut_tv.tv_sec = tv.tv_sec;
+	utmp.ut_tv.tv_usec = tv.tv_usec;
+	utmp.ut_pid  = pid;
+	utmp.ut_type = type;
+	strncpy(utmp.ut_name, user, sizeof(utmp.ut_name));
+	strncpy(utmp.ut_id  , id  , sizeof(utmp.ut_id  ));
+	strncpy(utmp.ut_line, line, sizeof(utmp.ut_line));
+        
+        /* Put the OS version in place of the hostname */
+        if (uname(&uname_buf) == 0)
+		strncpy(utmp.ut_host, uname_buf.release, sizeof(utmp.ut_host));
+
+	updwtmp(WTMP_FILE, &utmp);
+}