migrate fully to meson build system

- drop old build system
- move shared include and source files to common directory
- drop "rc-" prefix from shared include and source files
- move executable-specific code to individual directories under src
- adjust top-level .gitignore file for new build system

This closes #489.

6 files changed, 769 insertions, 0 deletions

diff --git a/src/openrc-shutdown/broadcast.c b/src/openrc-shutdown/broadcast.c
new file mode 100644
index 00000000..402a9fb9
--- /dev/null
+++ b/src/openrc-shutdown/broadcast.c
@@ -0,0 +1,211 @@
+/*
+ * broadcast.c
+ * broadcast a message to every logged in user
+ */
+
+/*
+ * Copyright 2018 Sony Interactive Entertainment Inc.
+ *
+ * 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/HEAD/LICENSE
+ * This file may not be copied, modified, propagated, or distributed
+ *    except according to the terms contained in the LICENSE file.
+ */
+#include <ctype.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <sys/sysmacros.h>
+#include <limits.h>
+#include <stdlib.h>
+#include <string.h>
+#include <time.h>
+#include <unistd.h>
+#include <stdio.h>
+#include <utmp.h>
+#include <utmpx.h>
+#include <pwd.h>
+#include <fcntl.h>
+#include <signal.h>
+#include <setjmp.h>
+#include <paths.h>
+#include <sys/utsname.h>
+
+#include "broadcast.h"
+#include "helpers.h"
+
+#ifndef _PATH_DEV
+# define _PATH_DEV	"/dev/"
+#endif
+
+static sigjmp_buf jbuf;
+
+/*
+ *	Alarm handler
+ */
+/*ARGSUSED*/
+# ifdef __GNUC__
+static void handler(int arg __attribute__((unused)))
+# else
+static void handler(int arg)
+# endif
+{
+	siglongjmp(jbuf, 1);
+}
+
+static void getuidtty(char **userp, char **ttyp)
+{
+	struct passwd 		*pwd;
+	uid_t			uid;
+	char			*tty;
+	static char		uidbuf[32];
+	char		*ttynm = NULL;
+
+	uid = getuid();
+	if ((pwd = getpwuid(uid)) != NULL) {
+		uidbuf[0] = 0;
+		strncat(uidbuf, pwd->pw_name, sizeof(uidbuf) - 1);
+	} else {
+		if (uid)
+			sprintf(uidbuf, "uid %d", (int) uid);
+		else
+			sprintf(uidbuf, "root");
+	}
+
+	if ((tty = ttyname(0)) != NULL) {
+		const size_t plen = strlen(_PATH_DEV);
+		if (strncmp(tty, _PATH_DEV, plen) == 0) {
+			tty += plen;
+			if (tty[0] == '/')
+				tty++;
+		}
+		xasprintf(&ttynm, "(%s) ", tty);
+	}
+
+	*userp = uidbuf;
+	*ttyp  = ttynm;
+}
+
+/*
+ *	Check whether the given filename looks like a tty device.
+ */
+static int file_isatty(const char *fname)
+{
+	struct stat		st;
+	int			major;
+
+	if (stat(fname, &st) < 0)
+		return 0;
+
+	if (st.st_nlink != 1 || !S_ISCHR(st.st_mode))
+		return 0;
+
+	/*
+	 *	It would be an impossible task to list all major/minors
+	 *	of tty devices here, so we just exclude the obvious
+	 *	majors of which just opening has side-effects:
+	 *	printers and tapes.
+	 */
+	major = major(st.st_dev);
+	if (major == 1 || major == 2 || major == 6 || major == 9 ||
+	    major == 12 || major == 16 || major == 21 || major == 27 ||
+	    major == 37 || major == 96 || major == 97 || major == 206 ||
+	    major == 230)
+		return 0;
+	return 1;
+}
+
+/*
+ *	broadcast function.
+ *
+ *	NB: Not multithread safe.
+ */
+void broadcast(char *text)
+{
+	char *tty;
+	char *user;
+	struct utsname name;
+	time_t t;
+	char	*date;
+	char *p;
+	char *line = NULL;
+	struct sigaction sa;
+	int	flags;
+	char *term = NULL;
+	struct utmpx *utmp;
+	/*
+	 * These are set across the sigsetjmp call, so they can't be stored on
+	 * the stack, otherwise they might be clobbered.
+	 */
+	static int fd;
+	static FILE *tp;
+
+	getuidtty(&user, &tty);
+
+	/*
+	 * Get and report current hostname, to make it easier to find out
+	 * which machine is being shut down.
+	 */
+	uname(&name);
+
+	/* Get the time */
+	time(&t);
+	date = ctime(&t);
+	p = strchr(date, '\n');
+	if (p)
+		*p = 0;
+
+	xasprintf(&line, "\007\r\nBroadcast message from %s@%s %s(%s):\r\n\r\n",
+			user, name.nodename, tty, date);
+	free(tty);
+
+	/*
+	 *	Fork to avoid hanging in a write()
+	 */
+	if (fork() != 0)
+		return;
+
+	memset(&sa, 0, sizeof(sa));
+	sa.sa_handler = handler;
+	sigemptyset(&sa.sa_mask);
+	sigaction(SIGALRM, &sa, NULL);
+
+	setutxent();
+
+	while ((utmp = getutxent()) != NULL) {
+		if (utmp->ut_type != USER_PROCESS || utmp->ut_user[0] == 0)
+			continue;
+		if (strncmp(utmp->ut_line, _PATH_DEV, strlen(_PATH_DEV)) == 0)
+			xasprintf(&term, "%s", utmp->ut_line);
+		else
+			xasprintf(&term, "%s%s", _PATH_DEV, utmp->ut_line);
+		if (strstr(term, "/../")) {
+			free(term);
+			continue;
+		}
+
+		/*
+		 *	Open it non-delay
+		 */
+		if (sigsetjmp(jbuf, 1) == 0) {
+			alarm(2);
+			flags = O_WRONLY|O_NDELAY|O_NOCTTY;
+			if (file_isatty(term) && (fd = open(term, flags)) >= 0) {
+				if (isatty(fd) && (tp = fdopen(fd, "w")) != NULL) {
+					fputs(line, tp);
+					fputs(text, tp);
+					fflush(tp);
+				}
+			}
+		}
+		alarm(0);
+		if (fd >= 0)
+			close(fd);
+		if (tp != NULL)
+			fclose(tp);
+		free(term);
+	}
+	endutxent();
+	free(line);
+	exit(0);
+}
diff --git a/src/openrc-shutdown/broadcast.h b/src/openrc-shutdown/broadcast.h
new file mode 100644
index 00000000..2255fe67
--- /dev/null
+++ b/src/openrc-shutdown/broadcast.h
@@ -0,0 +1,16 @@
+/*
+ * Copyright 2018 Sony Interactive Entertainment Inc.
+ *
+ * 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/HEAD/LICENSE
+ * This file may not be copied, modified, propagated, or distributed
+ *    except according to the terms contained in the LICENSE file.
+ */
+
+#ifndef BROADCAST_H
+#define BROADCAST_H
+
+void broadcast(char *text);
+
+#endif
diff --git a/src/openrc-shutdown/meson.build b/src/openrc-shutdown/meson.build
new file mode 100644
index 00000000..bdd58338
--- /dev/null
+++ b/src/openrc-shutdown/meson.build
@@ -0,0 +1,10 @@
+if os == 'Linux'
+  executable('openrc-shutdown',
+    ['openrc-shutdown.c', 'broadcast.c', 'rc-sysvinit.c', misc_c,
+		usage_c, wtmp_c, version_h],
+    c_args : cc_branding_flags,
+    include_directories: [incdir, einfo_incdir, rc_incdir],
+    link_with: [libeinfo, librc],
+    install: true,
+    install_dir: sbindir)
+endif
diff --git a/src/openrc-shutdown/openrc-shutdown.c b/src/openrc-shutdown/openrc-shutdown.c
new file mode 100644
index 00000000..1234dcfc
--- /dev/null
+++ b/src/openrc-shutdown/openrc-shutdown.c
@@ -0,0 +1,358 @@
+/*
+ * openrc-shutdown.c
+ * If you are using OpenRC's provided init, this will shut down or
+ * reboot your system.
+ *
+ * This is based on code written by James Hammons <jlhamm@acm.org>, so
+ * I would like to publically thank him for his work.
+ */
+
+/*
+ * Copyright 2017 The OpenRC Authors.
+ * See the Authors file at the top-level directory of this distribution and
+ * https://github.com/OpenRC/openrc/blob/HEAD/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/HEAD/LICENSE
+ * This file may not be copied, modified, propagated, or distributed
+ *    except according to the terms contained in the LICENSE file.
+ */
+
+#include <getopt.h>
+#include <signal.h>
+#include <stdbool.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <syslog.h>
+#include <unistd.h>
+#include <sys/types.h>
+#include <sys/utsname.h>
+
+#include "broadcast.h"
+#include "einfo.h"
+#include "rc.h"
+#include "helpers.h"
+#include "misc.h"
+#include "rc-sysvinit.h"
+#include "wtmp.h"
+#include "_usage.h"
+
+const char *applet = NULL;
+const char *extraopts = NULL;
+const char getoptstring[] = "cdDfFHKpRrsw" getoptstring_COMMON;
+const struct option longopts[] = {
+	{ "cancel",        no_argument, NULL, 'c'},
+	{ "no-write",        no_argument, NULL, 'd'},
+	{ "dry-run",        no_argument, NULL, 'D'},
+	{ "halt",        no_argument, NULL, 'H'},
+	{ "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[] = {
+	"cancel a pending shutdown",
+	"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 = "" \
+						   "Usage: openrc-shutdown -c | --cancel\n" \
+						   "   or: openrc-shutdown -R | --reexec\n" \
+						   "   or: openrc-shutdown -w | --write-only\n" \
+						   "   or: openrc-shutdown -H | --halt time\n" \
+						   "   or: openrc-shutdown -K | --kexec time\n" \
+						   "   or: openrc-shutdown -p | --poweroff time\n" \
+						   "   or: openrc-shutdown -r | --reboot time\n" \
+						   "   or: openrc-shutdown -s | --single time";
+const char *exclusive = "Select one of "
+	"--cancel, --halt, --kexec, --poweroff, --reexec, --reboot, --single or \n"
+	"--write-only";
+const char *nologin_file = RC_SYSCONFDIR"/nologin";
+const char *shutdown_pid = "/run/openrc-shutdown.pid";
+
+static bool do_cancel = false;
+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 cancel_shutdown(void)
+{
+	pid_t pid;
+
+	pid = get_pid(applet, shutdown_pid);
+	if (pid <= 0)
+		eerrorx("%s: Unable to cancel shutdown", applet);
+
+	if (kill(pid, SIGTERM) != -1)
+		einfo("%s: shutdown canceled", applet);
+	else
+		eerrorx("%s: Unable to cancel shutdown", applet);
+}
+
+/*
+ *	Create the nologin file.
+ */
+static void create_nologin(int mins)
+{
+	FILE *fp;
+	time_t t;
+
+	time(&t);
+	t += 60 * mins;
+
+	if ((fp = fopen(nologin_file, "w")) != NULL) {
+		fprintf(fp, "\rThe system is going down on %s\r\n", ctime(&t));
+		fclose(fp);
+	}
+}
+
+/*
+ * Send a command to our init
+ */
+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;
+	}
+
+	ignored = fwrite(cmd, 1, strlen(cmd), fifo);
+	if (ignored != strlen(cmd))
+		printf("Error writing to init fifo\n");
+	fclose(fifo);
+}
+
+/*
+ * sleep without being interrupted.
+ * The idea for this code came from sysvinit.
+ */
+static void sleep_no_interrupt(int seconds)
+{
+	struct timespec duration;
+	struct timespec remaining;
+
+	duration.tv_sec = seconds;
+	duration.tv_nsec = 0;
+
+	while (nanosleep(&duration, &remaining) < 0 && errno == EINTR)
+		duration = remaining;
+}
+
+static void stop_shutdown(int sig)
+{
+	(void) sig;
+	unlink(nologin_file);
+	unlink(shutdown_pid);
+einfo("Shutdown canceled");
+exit(0);
+}
+
+int main(int argc, char **argv)
+{
+	char *ch = NULL;
+	int opt;
+	int cmd_count = 0;
+	int hour = 0;
+	int min = 0;
+	int shutdown_delay = 0;
+	struct sigaction sa;
+	struct tm *lt;
+	time_t tv;
+	bool need_warning = false;
+	char *msg = NULL;
+	char *state = NULL;
+	char *time_arg = NULL;
+	FILE *fp;
+
+	applet = basename_c(argv[0]);
+	while ((opt = getopt_long(argc, argv, getoptstring,
+		    longopts, (int *) 0)) != -1)
+	{
+		switch (opt) {
+			case 'c':
+				do_cancel = true;
+			cmd_count++;
+				break;
+			case 'd':
+				do_wtmp = false;
+				break;
+		case 'D':
+			do_dryrun = true;
+			break;
+		case 'H':
+			do_halt = true;
+			xasprintf(&state, "%s", "halt");
+			cmd_count++;
+			break;
+		case 'K':
+			do_kexec = true;
+			xasprintf(&state, "%s", "reboot");
+			cmd_count++;
+			break;
+		case 'p':
+			do_poweroff = true;
+			xasprintf(&state, "%s", "power off");
+			cmd_count++;
+			break;
+		case 'R':
+			do_reexec = true;
+			cmd_count++;
+			break;
+		case 'r':
+			do_reboot = true;
+			xasprintf(&state, "%s", "reboot");
+			cmd_count++;
+			break;
+		case 's':
+			do_single = true;
+			xasprintf(&state, "%s", "go down for maintenance");
+			cmd_count++;
+			break;
+		case 'w':
+			do_wtmp_only = true;
+			cmd_count++;
+			break;
+		case_RC_COMMON_GETOPT
+		}
+	}
+	if (geteuid() != 0)
+		eerrorx("%s: you must be root\n", applet);
+	if (cmd_count != 1) {
+		eerror("%s: %s\n", applet, exclusive);
+		usage(EXIT_FAILURE);
+	}
+
+	if (do_cancel) {
+		cancel_shutdown();
+		exit(EXIT_SUCCESS);
+	} else if (do_reexec) {
+		send_cmd("reexec");
+		exit(EXIT_SUCCESS);
+	} else if (do_wtmp_only) {
+		log_wtmp("shutdown", "~~", 0, RUN_LVL, "~~");
+		exit(EXIT_SUCCESS);
+	}
+
+	if (optind >= argc) {
+		eerror("%s: No shutdown time specified", applet);
+		usage(EXIT_FAILURE);
+	}
+	time_arg = argv[optind];
+	if (*time_arg == '+')
+		time_arg++;
+	if (strcasecmp(time_arg, "now") == 0)
+		strcpy(time_arg, "0");
+	for (ch=time_arg; *ch; ch++)
+		if ((*ch < '0' || *ch > '9') && *ch != ':') {
+			eerror("%s: invalid time %s", applet, time_arg);
+			usage(EXIT_FAILURE);
+		}
+	if (strchr(time_arg, ':')) {
+		if ((sscanf(time_arg, "%2d:%2d", &hour, &min) != 2) ||
+				(hour > 23) || (min > 59)) {
+			eerror("%s: invalid time %s", applet, time_arg);
+			usage(EXIT_FAILURE);
+		}
+		time(&tv);
+		lt = localtime(&tv);
+		shutdown_delay = (hour * 60 + min) - (lt->tm_hour * 60 + lt->tm_min);
+		if (shutdown_delay < 0)
+			shutdown_delay += 1440;
+	} else {
+		shutdown_delay = atoi(time_arg);
+	}
+
+	fp = fopen(shutdown_pid, "w");
+	if (!fp)
+		eerrorx("%s: fopen `%s': %s", applet, shutdown_pid, strerror(errno));
+	fprintf(fp, "%d\n", getpid());
+	fclose(fp);
+
+	openlog(applet, LOG_PID, LOG_DAEMON);
+	memset(&sa, 0, sizeof(sa));
+	sa.sa_handler = stop_shutdown;
+	sigemptyset(&sa.sa_mask);
+	sigaction(SIGINT, &sa, NULL);
+	sigaction(SIGTERM, &sa, NULL);
+	while (shutdown_delay > 0) {
+		need_warning = false;
+		if (shutdown_delay > 180)
+			need_warning = (shutdown_delay % 60 == 0);
+		else if (shutdown_delay > 60)
+			need_warning = (shutdown_delay % 30 == 0);
+		else if	(shutdown_delay > 10)
+			need_warning = (shutdown_delay % 15 == 0);
+		else
+			need_warning = true;
+		if (shutdown_delay <= 5)
+			create_nologin(shutdown_delay);
+		if (need_warning) {
+		xasprintf(&msg, "\rThe system will %s in %d minutes\r\n",
+		          state, shutdown_delay);
+			broadcast(msg);
+			free(msg);
+		}
+		sleep_no_interrupt(60);
+		shutdown_delay--;
+	}
+	xasprintf(&msg, "\rThe system will %s now\r\n", state);
+	broadcast(msg);
+	syslog(LOG_NOTICE, "The system will %s now", state);
+	unlink(nologin_file);
+	unlink(shutdown_pid);
+	if (do_halt) {
+		if (exists("/run/initctl")) {
+			sysvinit_setenv("INIT_HALT", "HALT");
+			sysvinit_runlevel('0');
+		} else
+			send_cmd("halt");
+	} else if (do_kexec)
+		send_cmd("kexec");
+	else if (do_poweroff) {
+		if (exists("/run/initctl")) {
+			sysvinit_setenv("INIT_HALT", "POWEROFF");
+			sysvinit_runlevel('0');
+		} else
+			send_cmd("poweroff");
+	} else if (do_reboot) {
+		if (exists("/run/initctl"))
+			sysvinit_runlevel('6');
+		else
+			send_cmd("reboot");
+	} else if (do_single) {
+		if (exists("/run/initctl"))
+			sysvinit_runlevel('S');
+		else
+			send_cmd("single");
+	}
+	return 0;
+}
diff --git a/src/openrc-shutdown/rc-sysvinit.c b/src/openrc-shutdown/rc-sysvinit.c
new file mode 100644
index 00000000..8d258b63
--- /dev/null
+++ b/src/openrc-shutdown/rc-sysvinit.c
@@ -0,0 +1,102 @@
+/*
+ * rc-sysvinit.c
+ * Helper to send a runlevel change to sysvinit
+ */
+
+/*
+ * Copyright (c) 2019 The OpenRC Authors.
+ * See the Authors file at the top-level directory of this distribution and
+ * https://github.com/OpenRC/openrc/blob/HEAD/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/HEAD/LICENSE
+ * This file may not be copied, modified, propagated, or distributed
+ *    except according to the terms contained in the LICENSE file.
+ */
+
+#include <errno.h>
+#include <fcntl.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+
+#include "einfo.h"
+#include "rc-sysvinit.h"
+
+static void sysvinit_send_cmd(struct init_request *request)
+{
+	int fd;
+	char *p;
+	size_t bytes;
+	ssize_t r;
+
+	fd = open("/run/initctl", O_WRONLY|O_NONBLOCK|O_CLOEXEC|O_NOCTTY);
+	if (fd < 0) {
+		if (errno != ENOENT)
+			eerror("Failed to open initctl fifo: %s", strerror(errno));
+		return;
+	}
+	p = (char *) request;
+	bytes = sizeof(*request);
+	do {
+		r = write(fd, p, bytes);
+		if (r < 0) {
+			if ((errno == EAGAIN) || (errno == EINTR))
+				continue;
+			eerror("Failed to write to /run/initctl: %s", strerror(errno));
+			return;
+		}
+		p += r;
+		bytes -= r;
+	} while (bytes > 0);
+}
+
+void sysvinit_runlevel(char rl)
+{
+	struct init_request request;
+
+	if (!rl)
+		return;
+
+	request = (struct init_request) {
+		.magic = INIT_MAGIC,
+		.sleeptime = 0,
+		.cmd = INIT_CMD_RUNLVL,
+		.runlevel = rl,
+	};
+	sysvinit_send_cmd(&request);
+		return;
+}
+
+/*
+ *	Set environment variables in the init process.
+ */
+void sysvinit_setenv(const char *name, const char *value)
+{
+	struct init_request	request;
+	size_t nl;
+	size_t vl;
+
+	memset(&request, 0, sizeof(request));
+	request.magic = INIT_MAGIC;
+	request.cmd = INIT_CMD_SETENV;
+	nl = strlen(name);
+	if (value)
+		vl = strlen(value);
+else
+		vl = 0;
+
+	if (nl + vl + 3 >= (int)sizeof(request.i.data))
+		return;
+
+	memcpy(request.i.data, name, nl);
+	if (value) {
+		request.i.data[nl] = '=';
+		memcpy(request.i.data + nl + 1, value, vl);
+	}
+	sysvinit_send_cmd(&request);
+	return;
+}
diff --git a/src/openrc-shutdown/rc-sysvinit.h b/src/openrc-shutdown/rc-sysvinit.h
new file mode 100644
index 00000000..6142cdd6
--- /dev/null
+++ b/src/openrc-shutdown/rc-sysvinit.h
@@ -0,0 +1,72 @@
+/*
+ * rc-sysvinit.h	- Interface to communicate with sysvinit via /run/initctl.
+ */
+
+/*
+ * Copyright (c) 2019 The OpenRC Authors.
+ * See the Authors file at the top-level directory of this distribution and
+ * https://github.com/OpenRC/openrc/blob/HEAD/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/HEAD/LICENSE
+ * This file may not be copied, modified, propagated, or distributed
+ *    except according to the terms contained in the LICENSE file.
+ */
+
+#ifndef _RC_SYSVINIT_H
+#define _RC_SYSVINIT_H
+
+/*
+ * The #defines and structures below are taken from initreq.h in
+ * sysvinit and must be used by any program wishing to communicate with
+ * it.
+ */
+
+#define INIT_MAGIC 0x03091969
+#define INIT_CMD_START		0
+#define INIT_CMD_RUNLVL		1
+#define INIT_CMD_POWERFAIL	2
+#define INIT_CMD_POWERFAILNOW	3
+#define INIT_CMD_POWEROK	4
+#define INIT_CMD_BSD		5
+#define INIT_CMD_SETENV		6
+#define INIT_CMD_UNSETENV	7
+
+/*
+ *	This is what BSD 4.4 uses when talking to init.
+ *	Linux doesn't use this right now.
+ */
+struct init_request_bsd {
+	char	gen_id[8];		/* Beats me.. telnetd uses "fe" */
+	char	tty_id[16];		/* Tty name minus /dev/tty      */
+	char	host[64];	/* Hostname                     */
+	char	term_type[16];		/* Terminal type                */
+	int	signal;			/* Signal to send               */
+	int	pid;			/* Process to send to           */
+	char	exec_name[128];	        /* Program to execute           */
+	char	reserved[128];		/* For future expansion.        */
+};
+
+/*
+ *	Because of legacy interfaces, "runlevel" and "sleeptime"
+ *	aren't in a seperate struct in the union.
+ *
+ *	The weird sizes are because init expects the whole
+ *	struct to be 384 bytes.
+ */
+struct init_request {
+	int	magic;			/* Magic number                 */
+	int	cmd;			/* What kind of request         */
+	int	runlevel;		/* Runlevel to change to        */
+	int	sleeptime;		/* Time between TERM and KILL   */
+	union {
+		struct init_request_bsd	bsd;
+		char			data[368];
+	} i;
+};
+
+void sysvinit_runlevel(char rl);
+void sysvinit_setenv(const char *name, const char *value);
+
+#endif