1/*
2 * Copyright (c) 1988, 1990, 1993
3 *	The Regents of the University of California.  All rights reserved.
4 * Portions copyright (c) 2007 Apple Inc.  All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 *    notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 *    notice, this list of conditions and the following disclaimer in the
13 *    documentation and/or other materials provided with the distribution.
14 * 3. Neither the name of the University nor the names of its contributors
15 *    may be used to endorse or promote products derived from this software
16 *    without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28 * SUCH DAMAGE.
29 */
30
31#if 0
32#ifndef lint
33static const char copyright[] =
34"@(#) Copyright (c) 1988, 1990, 1993\n\
35	The Regents of the University of California.  All rights reserved.\n";
36#endif /* not lint */
37
38#ifndef lint
39static char sccsid[] = "@(#)shutdown.c	8.4 (Berkeley) 4/28/95";
40#endif /* not lint */
41#endif
42#include <sys/cdefs.h>
43#ifndef __APPLE__
44__FBSDID("$FreeBSD: src/sbin/shutdown/shutdown.c,v 1.28 2005/01/25 08:40:51 delphij Exp $");
45#endif
46
47#include <sys/param.h>
48#include <sys/time.h>
49#include <sys/resource.h>
50#include <sys/syslog.h>
51
52#include <ctype.h>
53#include <err.h>
54#include <fcntl.h>
55#include <paths.h>
56#include <pwd.h>
57#include <setjmp.h>
58#include <signal.h>
59#include <stdio.h>
60#include <stdlib.h>
61#include <string.h>
62#include <unistd.h>
63
64#ifdef __APPLE__
65#include <errno.h>
66#include <util.h>
67#include <bsm/libbsm.h>
68#include <bsm/audit_uevents.h>
69#include <vproc.h>
70#include <vproc_priv.h>
71
72#include "kextmanager.h"
73#include <IOKit/kext/kextmanager_types.h>
74#include <IOKit/pwr_mgt/IOPMLib.h>
75#include <mach/mach_port.h>		// allocate
76#include <mach/mach.h>			// task_self, etc
77#include <servers/bootstrap.h>	// bootstrap
78#include <bootstrap_priv.h>
79#include <reboot2.h>
80#include <utmpx.h>
81#include <sys/sysctl.h>
82
83#include "pathnames.h"
84#endif /* __APPLE__ */
85
86#ifdef DEBUG
87#undef _PATH_NOLOGIN
88#define	_PATH_NOLOGIN	"./nologin"
89#endif
90
91#define	H		*60*60
92#define	M		*60
93#define	S		*1
94#define	NOLOG_TIME	5*60
95struct interval {
96	int timeleft, timetowait;
97} tlist[] = {
98	{ 10 H,  5 H },
99	{  5 H,  3 H },
100	{  2 H,  1 H },
101	{  1 H, 30 M },
102	{ 30 M, 10 M },
103	{ 20 M, 10 M },
104	{ 10 M,  5 M },
105	{  5 M,  3 M },
106	{  2 M,  1 M },
107	{  1 M, 30 S },
108	{ 30 S, 30 S },
109	{  0  ,  0   }
110};
111#undef H
112#undef M
113#undef S
114
115static time_t offset, shuttime;
116#ifdef __APPLE__
117static int dohalt, doreboot, doups, killflg, mbuflen, oflag;
118#else
119static int dohalt, dopower, doreboot, killflg, mbuflen, oflag;
120#endif
121static char mbuf[BUFSIZ];
122static const char *nosync, *whom;
123#ifdef __APPLE__
124static int dosleep;
125#endif
126
127void badtime(void);
128#ifdef __APPLE__
129void log_and_exec_reboot_or_halt(void);
130#else
131void die_you_gravy_sucking_pig_dog(void);
132#endif
133void finish(int);
134void getoffset(char *);
135void loop(void);
136void nolog(void);
137void timeout(int);
138void timewarn(int);
139void usage(const char *);
140#ifdef __APPLE__
141int audit_shutdown(int);
142int reserve_reboot(void);
143#endif
144
145extern const char **environ;
146
147int
148main(int argc, char **argv)
149{
150	char *p, *endp;
151	struct passwd *pw;
152	int arglen, ch, len, readstdin;
153
154#ifndef DEBUG
155	if (geteuid())
156		errx(1, "NOT super-user");
157#endif
158	nosync = NULL;
159	readstdin = 0;
160#ifndef __APPLE__
161	while ((ch = getopt(argc, argv, "-hknopr")) != -1)
162#else
163	while ((ch = getopt(argc, argv, "-hknorsu")) != -1)
164#endif
165		switch (ch) {
166		case '-':
167			readstdin = 1;
168			break;
169		case 'h':
170			dohalt = 1;
171			break;
172		case 'k':
173			killflg = 1;
174			break;
175		case 'n':
176			nosync = "-n";
177			break;
178		case 'o':
179			oflag = 1;
180			break;
181#ifndef __APPLE__
182		case 'p':
183			dopower = 1;
184			break;
185#endif
186        case 'u':
187            doups = 1;
188            break;
189		case 'r':
190			doreboot = 1;
191			break;
192#ifdef __APPLE__
193		case 's':
194			dosleep = 1;
195			break;
196#endif
197		case '?':
198		default:
199			usage((char *)NULL);
200		}
201	argc -= optind;
202	argv += optind;
203
204	if (argc < 1)
205		usage((char *)NULL);
206
207#ifndef __APPLE__
208	if (killflg + doreboot + dohalt + dopower > 1)
209		usage("incompatible switches -h, -k, -p and -r");
210
211	if (oflag && !(dohalt || dopower || doreboot))
212		usage("-o requires -h, -p or -r");
213
214	if (nosync != NULL && !oflag)
215		usage("-n requires -o");
216#else /* !__APPLE__ */
217	if (killflg + doreboot + dohalt + dosleep > 1)
218		usage("incompatible switches -h, -k, -r, and -s");
219
220	if (!(dohalt || doreboot || dosleep || killflg))
221		usage("-h, -r, -s, or -k is required");
222
223	if (doups && !dohalt)
224		usage("-u requires -h");
225#endif /* !__APPLE__ */
226
227	getoffset(*argv++);
228
229	if (*argv) {
230		for (p = mbuf, len = sizeof(mbuf); *argv; ++argv) {
231			arglen = strlen(*argv);
232			if ((len -= arglen) <= 2)
233				break;
234			if (p != mbuf)
235				*p++ = ' ';
236			memmove(p, *argv, arglen);
237			p += arglen;
238		}
239		*p = '\n';
240		*++p = '\0';
241	}
242
243	if (readstdin) {
244		p = mbuf;
245		endp = mbuf + sizeof(mbuf) - 2;
246		for (;;) {
247			if (!fgets(p, endp - p + 1, stdin))
248				break;
249			for (; *p &&  p < endp; ++p);
250			if (p == endp) {
251				*p = '\n';
252				*++p = '\0';
253				break;
254			}
255		}
256	}
257	mbuflen = strlen(mbuf);
258
259	if (offset)
260		(void)printf("Shutdown at %.24s.\n", ctime(&shuttime));
261	else
262		(void)printf("Shutdown NOW!\n");
263
264	if (!(whom = getlogin()))
265		whom = (pw = getpwuid(getuid())) ? pw->pw_name : "???";
266
267#ifdef DEBUG
268	audit_shutdown(0);
269	(void)putc('\n', stdout);
270#else
271	(void)setpriority(PRIO_PROCESS, 0, PRIO_MIN);
272#ifdef __APPLE__
273	if (offset) {
274#else
275	{
276#endif
277		int forkpid;
278
279		forkpid = fork();
280		if (forkpid == -1) {
281			audit_shutdown(1);
282			err(1, "fork");
283		}
284		if (forkpid)
285			errx(0, "[pid %d]", forkpid);
286#ifdef __APPLE__
287		/* 5863185: reboot2() needs to talk to launchd. */
288		if (_vprocmgr_detach_from_console(0) != NULL)
289			warnx("can't detach from console");
290#endif /* __APPLE__ */
291	}
292	audit_shutdown(0);
293	setsid();
294#endif
295	openlog("shutdown", LOG_CONS, LOG_AUTH);
296	loop();
297	return(0);
298}
299
300void
301loop()
302{
303	struct interval *tp;
304	u_int sltime;
305	int logged;
306
307	if (offset <= NOLOG_TIME) {
308		logged = 1;
309		nolog();
310	}
311	else
312		logged = 0;
313	tp = tlist;
314	if (tp->timeleft < offset)
315		(void)sleep((u_int)(offset - tp->timeleft));
316	else {
317		while (tp->timeleft && offset < tp->timeleft)
318			++tp;
319		/*
320		 * Warn now, if going to sleep more than a fifth of
321		 * the next wait time.
322		 */
323		if ((sltime = offset - tp->timeleft)) {
324			if (sltime > (u_int)(tp->timetowait / 5))
325				timewarn(offset);
326			(void)sleep(sltime);
327		}
328	}
329	for (;; ++tp) {
330		timewarn(tp->timeleft);
331		if (!logged && tp->timeleft <= NOLOG_TIME) {
332			logged = 1;
333			nolog();
334		}
335		(void)sleep((u_int)tp->timetowait);
336		if (!tp->timeleft)
337			break;
338	}
339#ifdef __APPLE__
340	log_and_exec_reboot_or_halt();
341#else
342	die_you_gravy_sucking_pig_dog();
343#endif
344}
345
346static jmp_buf alarmbuf;
347
348static const char *restricted_environ[] = {
349	"PATH=" _PATH_STDPATH,
350	NULL
351};
352
353void
354timewarn(int timeleft)
355{
356	static int first;
357	static char hostname[MAXHOSTNAMELEN + 1];
358	FILE *pf;
359	char wcmd[MAXPATHLEN + 4];
360
361	/* wall is sometimes missing, e.g. on install media */
362	if (access(_PATH_WALL, X_OK) == -1) return;
363
364	if (!first++)
365		(void)gethostname(hostname, sizeof(hostname));
366
367	/* undoc -n option to wall suppresses normal wall banner */
368	(void)snprintf(wcmd, sizeof(wcmd), "%s -n", _PATH_WALL);
369	environ = restricted_environ;
370	if (!(pf = popen(wcmd, "w"))) {
371		syslog(LOG_ERR, "shutdown: can't find %s: %m", _PATH_WALL);
372		return;
373	}
374
375	(void)fprintf(pf,
376	    "\007*** %sSystem shutdown message from %s@%s ***\007\n",
377	    timeleft ? "": "FINAL ", whom, hostname);
378
379	if (timeleft > 10*60)
380		(void)fprintf(pf, "System going down at %5.5s\n\n",
381		    ctime(&shuttime) + 11);
382	else if (timeleft > 59)
383		(void)fprintf(pf, "System going down in %d minute%s\n\n",
384		    timeleft / 60, (timeleft > 60) ? "s" : "");
385	else if (timeleft)
386		(void)fprintf(pf, "System going down in 30 seconds\n\n");
387	else
388		(void)fprintf(pf, "System going down IMMEDIATELY\n\n");
389
390	if (mbuflen)
391		(void)fwrite(mbuf, sizeof(*mbuf), mbuflen, pf);
392
393	/*
394	 * play some games, just in case wall doesn't come back
395	 * probably unnecessary, given that wall is careful.
396	 */
397	if (!setjmp(alarmbuf)) {
398		(void)signal(SIGALRM, timeout);
399		(void)alarm((u_int)30);
400		(void)pclose(pf);
401		(void)alarm((u_int)0);
402		(void)signal(SIGALRM, SIG_DFL);
403	}
404}
405
406void
407timeout(int signo __unused)
408{
409	longjmp(alarmbuf, 1);
410}
411
412void
413#ifdef __APPLE__
414log_and_exec_reboot_or_halt()
415#else
416die_you_gravy_sucking_pig_dog()
417#endif
418{
419#ifndef __APPLE__
420	char *empty_environ[] = { NULL };
421#else
422	if ((errno = reserve_reboot())) {
423		warn("couldn't lock for reboot");
424		finish(0);
425	}
426#endif
427
428	syslog(LOG_NOTICE, "%s%s by %s: %s",
429#ifndef __APPLE__
430	    doreboot ? "reboot" : dohalt ? "halt" : dopower ? "power-down" :
431#else
432	    doreboot ? "reboot" : dohalt ? "halt" : dosleep ? "sleep" :
433#endif
434	    "shutdown", doups?" with UPS delay":"", whom, mbuf);
435#ifndef __APPLE__
436	(void)sleep(2);
437#endif
438
439	(void)printf("\r\nSystem shutdown time has arrived\007\007\r\n");
440	if (killflg) {
441		(void)printf("\rbut you'll have to do it yourself\r\n");
442		exit(0);
443	}
444#ifdef DEBUG
445	if (doreboot)
446		(void)printf("reboot");
447	else if (dohalt)
448		(void)printf("halt");
449#ifndef __APPLE__
450	else if (dopower)
451		(void)printf("power-down");
452	if (nosync != NULL)
453		(void)printf(" no sync");
454#else
455	else if (dosleep)
456		(void)printf("sleep");
457#endif
458	(void)printf("\nkill -HUP 1\n");
459#else
460#ifdef __APPLE__
461	if (dosleep) {
462		mach_port_t mp;
463		io_connect_t fb;
464		kern_return_t kr = IOMasterPort(bootstrap_port, &mp);
465		if (kr == kIOReturnSuccess) {
466			fb = IOPMFindPowerManagement(mp);
467			if (fb != IO_OBJECT_NULL) {
468				IOReturn err = IOPMSleepSystem(fb);
469				if (err != kIOReturnSuccess) {
470					fprintf(stderr, "shutdown: sleep failed (0x%08x)\n", err);
471					kr = -1;
472				}
473			}
474		}
475	} else {
476		int howto = 0;
477
478#if defined(__APPLE__)
479		{
480			struct utmpx utx;
481			bzero(&utx, sizeof(utx));
482			utx.ut_type = SHUTDOWN_TIME;
483			gettimeofday(&utx.ut_tv, NULL);
484			pututxline(&utx);
485
486			int newvalue = 1;
487			sysctlbyname("kern.willshutdown", NULL, NULL, &newvalue, sizeof(newvalue));
488		}
489#else
490		logwtmp("~", "shutdown", "");
491#endif
492
493		if (dohalt) howto |= RB_HALT;
494		if (doups) howto |= RB_UPSDELAY;
495		if (nosync) howto |= RB_NOSYNC;
496
497		// launchd(8) handles reboot.  This call returns NULL on success.
498		if (reboot2(howto)) {
499			syslog(LOG_ERR, "shutdown: launchd reboot failed.");
500		}
501	}
502#else /* __APPLE__ */
503	if (!oflag) {
504		(void)kill(1, doreboot ? SIGINT :	/* reboot */
505			      dohalt ? SIGUSR1 :	/* halt */
506			      dopower ? SIGUSR2 :	/* power-down */
507			      SIGTERM);			/* single-user */
508	} else {
509		if (doreboot) {
510			execle(_PATH_REBOOT, "reboot", "-l", nosync,
511				(char *)NULL, empty_environ);
512			syslog(LOG_ERR, "shutdown: can't exec %s: %m.",
513				_PATH_REBOOT);
514			warn(_PATH_REBOOT);
515		}
516		else if (dohalt) {
517			execle(_PATH_HALT, "halt", "-l", nosync,
518				(char *)NULL, empty_environ);
519			syslog(LOG_ERR, "shutdown: can't exec %s: %m.",
520				_PATH_HALT);
521			warn(_PATH_HALT);
522		}
523		else if (dopower) {
524			execle(_PATH_HALT, "halt", "-l", "-p", nosync,
525				(char *)NULL, empty_environ);
526			syslog(LOG_ERR, "shutdown: can't exec %s: %m.",
527				_PATH_HALT);
528			warn(_PATH_HALT);
529		}
530		(void)kill(1, SIGTERM);		/* to single-user */
531	}
532#endif /* __APPLE__ */
533#endif
534	finish(0);
535}
536
537#define	ATOI2(p)	(p[0] - '0') * 10 + (p[1] - '0'); p += 2;
538
539void
540getoffset(char *timearg)
541{
542	struct tm *lt;
543	char *p;
544	time_t now;
545	int this_year;
546
547	(void)time(&now);
548
549	if (!strcasecmp(timearg, "now")) {		/* now */
550		offset = 0;
551		shuttime = now;
552		return;
553	}
554
555	if (*timearg == '+') {				/* +minutes */
556		if (!isdigit(*++timearg))
557			badtime();
558		if ((offset = atoi(timearg) * 60) < 0)
559			badtime();
560		shuttime = now + offset;
561		return;
562	}
563
564	/* handle hh:mm by getting rid of the colon */
565	for (p = timearg; *p; ++p)
566		if (!isascii(*p) || !isdigit(*p)) {
567			if (*p == ':' && strlen(p) == 3) {
568				p[0] = p[1];
569				p[1] = p[2];
570				p[2] = '\0';
571			}
572			else
573				badtime();
574		}
575
576	unsetenv("TZ");					/* OUR timezone */
577	lt = localtime(&now);				/* current time val */
578
579	switch(strlen(timearg)) {
580	case 10:
581		this_year = lt->tm_year;
582		lt->tm_year = ATOI2(timearg);
583		/*
584		 * check if the specified year is in the next century.
585		 * allow for one year of user error as many people will
586		 * enter n - 1 at the start of year n.
587		 */
588		if (lt->tm_year < (this_year % 100) - 1)
589			lt->tm_year += 100;
590		/* adjust for the year 2000 and beyond */
591		lt->tm_year += (this_year - (this_year % 100));
592		/* FALLTHROUGH */
593	case 8:
594		lt->tm_mon = ATOI2(timearg);
595		if (--lt->tm_mon < 0 || lt->tm_mon > 11)
596			badtime();
597		/* FALLTHROUGH */
598	case 6:
599		lt->tm_mday = ATOI2(timearg);
600		if (lt->tm_mday < 1 || lt->tm_mday > 31)
601			badtime();
602		/* FALLTHROUGH */
603	case 4:
604		lt->tm_hour = ATOI2(timearg);
605		if (lt->tm_hour < 0 || lt->tm_hour > 23)
606			badtime();
607		lt->tm_min = ATOI2(timearg);
608		if (lt->tm_min < 0 || lt->tm_min > 59)
609			badtime();
610		lt->tm_sec = 0;
611		if ((shuttime = mktime(lt)) == -1)
612			badtime();
613		if ((offset = shuttime - now) < 0)
614			errx(1, "that time is already past.");
615		break;
616	default:
617		badtime();
618	}
619}
620
621#define	NOMSG	"\n\nNO LOGINS: System going down at "
622void
623nolog()
624{
625	int logfd;
626	char *ct;
627
628	(void)unlink(_PATH_NOLOGIN);	/* in case linked to another file */
629	(void)signal(SIGINT, finish);
630	(void)signal(SIGHUP, finish);
631	(void)signal(SIGQUIT, finish);
632	(void)signal(SIGTERM, finish);
633	if ((logfd = open(_PATH_NOLOGIN, O_WRONLY|O_CREAT|O_TRUNC,
634	    0664)) >= 0) {
635		(void)write(logfd, NOMSG, sizeof(NOMSG) - 1);
636		ct = ctime(&shuttime);
637		(void)write(logfd, ct + 11, 5);
638		(void)write(logfd, "\n\n", 2);
639		(void)write(logfd, mbuf, strlen(mbuf));
640		(void)close(logfd);
641	}
642}
643
644void
645finish(int signo __unused)
646{
647	if (!killflg)
648		(void)unlink(_PATH_NOLOGIN);
649	exit(0);
650}
651
652void
653badtime()
654{
655	errx(1, "bad time format");
656}
657
658void
659usage(const char *cp)
660{
661	if (cp != NULL)
662		warnx("%s", cp);
663	(void)fprintf(stderr,
664#ifdef __APPLE__
665	    "usage: shutdown [-] [-h [-u] [-n] | -r [-n] | -s | -k]"
666#else
667	    "usage: shutdown [-] [-h | -p | -r | -k] [-o [-n]]"
668#endif
669	    " time [warning-message ...]\n");
670	exit(1);
671}
672
673#ifdef __APPLE__
674/*
675 * The following tokens are included in the audit record for shutdown
676 * header
677 * subject
678 * return
679 */
680int audit_shutdown(int exitstatus)
681{
682	int aufd;
683	token_t *tok;
684	long au_cond;
685
686	/* If we are not auditing, don't cut an audit record; just return */
687	if (auditon(A_GETCOND, &au_cond, sizeof(long)) < 0) {
688		fprintf(stderr, "shutdown: Could not determine audit condition\n");
689		return 0;
690	}
691	if (au_cond == AUC_NOAUDIT)
692		return 0;
693
694	if((aufd = au_open()) == -1) {
695		fprintf(stderr, "shutdown: Audit Error: au_open() failed\n");
696		exit(1);
697	}
698
699	/* The subject that performed the operation */
700	if((tok = au_to_me()) == NULL) {
701		fprintf(stderr, "shutdown: Audit Error: au_to_me() failed\n");
702		exit(1);
703	}
704	au_write(aufd, tok);
705
706	/* success and failure status */
707	if((tok = au_to_return32(exitstatus, errno)) == NULL) {
708		fprintf(stderr, "shutdown: Audit Error: au_to_return32() failed\n");
709		exit(1);
710	}
711	au_write(aufd, tok);
712
713	if(au_close(aufd, 1, AUE_shutdown) == -1) {
714		fprintf(stderr, "shutdown: Audit Error: au_close() failed\n");
715		exit(1);
716	}
717	return 1;
718}
719
720
721// XX copied from reboot.tproj/reboot.c; it would be nice to share the code
722
723#define WAITFORLOCK 1
724/*
725 * contact kextd to lock for reboot
726 */
727int
728reserve_reboot()
729{
730    int rval = ELAST + 1;
731    kern_return_t macherr = KERN_FAILURE;
732    mach_port_t kxport, tport = MACH_PORT_NULL, myport = MACH_PORT_NULL;
733    int busyStatus = ELAST + 1;
734    mountpoint_t busyVol;
735
736    macherr = bootstrap_look_up2(bootstrap_port, KEXTD_SERVER_NAME, &kxport, 0, BOOTSTRAP_PRIVILEGED_SERVER);
737    if (macherr)  goto finish;
738
739    // allocate a port to pass to kextd (in case we die)
740    tport = mach_task_self();
741    if (tport == MACH_PORT_NULL)  goto finish;
742    macherr = mach_port_allocate(tport, MACH_PORT_RIGHT_RECEIVE, &myport);
743    if (macherr)  goto finish;
744
745    // try to lock for reboot
746    macherr = kextmanager_lock_reboot(kxport, myport, !WAITFORLOCK, busyVol,
747                                      &busyStatus);
748    if (macherr)  goto finish;
749
750    if (busyStatus == EBUSY) {
751        warnx("%s is busy updating; waiting for lock", busyVol);
752        macherr = kextmanager_lock_reboot(kxport, myport, WAITFORLOCK,
753                                          busyVol, &busyStatus);
754        if (macherr)    goto finish;
755    }
756
757    if (busyStatus == EALREADY) {
758        // reboot already in progress
759        rval = 0;
760    } else {
761        rval = busyStatus;
762    }
763
764finish:
765    // in general, we want to err on the side of allowing the reboot
766    if (macherr) {
767        if (macherr != BOOTSTRAP_UNKNOWN_SERVICE)
768            warnx("WARNING: couldn't lock kext manager for reboot: %s",
769                    mach_error_string(macherr));
770        rval = 0;
771    }
772    // unless we got the lock, clean up our port
773    if (busyStatus != 0 && myport != MACH_PORT_NULL)
774        mach_port_mod_refs(tport, myport, MACH_PORT_RIGHT_RECEIVE, -1);
775
776    return rval;
777}
778#endif /* __APPLE__ */
779
780