aboutsummaryrefslogtreecommitdiff
path: root/runit/sv.c
blob: dc5dcceb3b860bd40c019c79116b0615d28100b4 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
/*
Copyright (c) 2001-2006, Gerrit Pape
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. The name of the author may not be used to endorse or promote products
      derived from this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE AUTHOR ''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 AUTHOR 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.
*/

/* Taken from http://smarden.org/runit/sv.8.html:

sv - control and manage services monitored by runsv

sv [-v] [-w sec] command services
/etc/init.d/service [-w sec] command

The sv program reports the current status and controls the state of services
monitored by the runsv(8) supervisor.

services consists of one or more arguments, each argument naming a directory
service used by runsv(8). If service doesn't start with a dot or slash and
doesn't end with a slash, it is searched in the default services directory
/var/service/, otherwise relative to the current directory.

command is one of up, down, status, once, pause, cont, hup, alarm, interrupt,
1, 2, term, kill, or exit, or start, stop, reload, restart, shutdown,
force-stop, force-reload, force-restart, force-shutdown, try-restart.

status
    Report the current status of the service, and the appendant log service
    if available, to standard output.
up
    If the service is not running, start it. If the service stops, restart it.
down
    If the service is running, send it the TERM signal, and the CONT signal.
    If ./run exits, start ./finish if it exists. After it stops, do not
    restart service.
once
    If the service is not running, start it. Do not restart it if it stops.
pause cont hup alarm interrupt quit 1 2 term kill
    If the service is running, send it the STOP, CONT, HUP, ALRM, INT, QUIT,
    USR1, USR2, TERM, or KILL signal respectively.
exit
    If the service is running, send it the TERM signal, and the CONT signal.
    Do not restart the service. If the service is down, and no log service
    exists, runsv(8) exits. If the service is down and a log service exists,
    runsv(8) closes the standard input of the log service and waits for it to
    terminate. If the log service is down, runsv(8) exits. This command is
    ignored if it is given to an appendant log service.

sv actually looks only at the first character of above commands.

Commands compatible to LSB init script actions:

status
    Same as status.
start
    Same as up, but wait up to 7 seconds for the command to take effect.
    Then report the status or timeout. If the script ./check exists in
    the service directory, sv runs this script to check whether the service
    is up and available; it's considered to be available if ./check exits
    with 0.
stop
    Same as down, but wait up to 7 seconds for the service to become down.
    Then report the status or timeout.
reload
    Same as hup, and additionally report the status afterwards.
restart
    Send the commands term, cont, and up to the service, and wait up to
    7 seconds for the service to restart. Then report the status or timeout.
    If the script ./check exists in the service directory, sv runs this script
    to check whether the service is up and available again; it's considered
    to be available if ./check exits with 0.
shutdown
    Same as exit, but wait up to 7 seconds for the runsv(8) process
    to terminate. Then report the status or timeout.
force-stop
    Same as down, but wait up to 7 seconds for the service to become down.
    Then report the status, and on timeout send the service the kill command.
force-reload
    Send the service the term and cont commands, and wait up to
    7 seconds for the service to restart. Then report the status,
    and on timeout send the service the kill command.
force-restart
    Send the service the term, cont and up commands, and wait up to
    7 seconds for the service to restart. Then report the status, and
    on timeout send the service the kill command. If the script ./check
    exists in the service directory, sv runs this script to check whether
    the service is up and available again; it's considered to be available
    if ./check exits with 0.
force-shutdown
    Same as exit, but wait up to 7 seconds for the runsv(8) process to
    terminate. Then report the status, and on timeout send the service
    the kill command.
try-restart
    if the service is running, send it the term and cont commands, and wait up to
    7 seconds for the service to restart. Then report the status or timeout.

Additional Commands

check
    Check for the service to be in the state that's been requested. Wait up to
    7 seconds for the service to reach the requested state, then report
    the status or timeout. If the requested state of the service is up,
    and the script ./check exists in the service directory, sv runs
    this script to check whether the service is up and running;
    it's considered to be up if ./check exits with 0.

Options

-v
    If the command is up, down, term, once, cont, or exit, then wait up to 7
    seconds for the command to take effect. Then report the status or timeout.
-w sec
    Override the default timeout of 7 seconds with sec seconds. Implies -v.

Environment

SVDIR
    The environment variable $SVDIR overrides the default services directory
    /var/service.
SVWAIT
    The environment variable $SVWAIT overrides the default 7 seconds to wait
    for a command to take effect. It is overridden by the -w option.

Exit Codes
    sv exits 0, if the command was successfully sent to all services, and,
    if it was told to wait, the command has taken effect to all services.

    For each service that caused an error (e.g. the directory is not
    controlled by a runsv(8) process, or sv timed out while waiting),
    sv increases the exit code by one and exits non zero. The maximum
    is 99. sv exits 100 on error.
*/

/* Busyboxed by Denys Vlasenko <vda.linux@googlemail.com> */

//config:config SV
//config:	bool "sv (7.8 kb)"
//config:	default y
//config:	help
//config:	sv reports the current status and controls the state of services
//config:	monitored by the runsv supervisor.
//config:
//config:config SV_DEFAULT_SERVICE_DIR
//config:	string "Default directory for services"
//config:	default "/var/service"
//config:	depends on SV
//config:	help
//config:	Default directory for services.
//config:	Defaults to "/var/service"
//config:
//config:config SVC
//config:	bool "svc (7.8 kb)"
//config:	default y
//config:	help
//config:	svc controls the state of services monitored by the runsv supervisor.
//config:	It is comaptible with daemontools command with the same name.

//applet:IF_SV( APPLET_NOEXEC(sv,  sv,  BB_DIR_USR_BIN, BB_SUID_DROP, sv ))
//applet:IF_SVC(APPLET_NOEXEC(svc, svc, BB_DIR_USR_BIN, BB_SUID_DROP, svc))

//kbuild:lib-$(CONFIG_SV) += sv.o
//kbuild:lib-$(CONFIG_SVC) += sv.o

#include <sys/file.h>
#include "libbb.h"
#include "common_bufsiz.h"
#include "runit_lib.h"

struct globals {
	const char *acts;
	char **service;
	unsigned rc;
/* "Bernstein" time format: unix + 0x400000000000000aULL */
	uint64_t tstart, tnow;
	svstatus_t svstatus;
	smallint islog;
} FIX_ALIASING;
#define G (*(struct globals*)bb_common_bufsiz1)
#define acts         (G.acts        )
#define service      (G.service     )
#define rc           (G.rc          )
#define tstart       (G.tstart      )
#define tnow         (G.tnow        )
#define svstatus     (G.svstatus    )
#define islog        (G.islog       )
#define INIT_G() do { \
	setup_common_bufsiz(); \
	/* need to zero out, svc calls sv() repeatedly */ \
	memset(&G, 0, sizeof(G)); \
} while (0)


#define str_equal(s,t) (strcmp((s), (t)) == 0)


static void fatal_cannot(const char *m1) NORETURN;
static void fatal_cannot(const char *m1)
{
	bb_perror_msg("fatal: can't %s", m1);
	_exit(151);
}

static void out(const char *p, const char *m1)
{
	printf("%s%s%s: %s", p, *service, islog ? "/log" : "", m1);
	if (errno) {
		printf(": "STRERROR_FMT STRERROR_ERRNO);
	}
	bb_putchar('\n'); /* will also flush the output */
}

#define WARN    "warning: "
#define OK      "ok: "

static void fail(const char *m1)
{
	++rc;
	out("fail: ", m1);
}
static void failx(const char *m1)
{
	errno = 0;
	fail(m1);
}
static void warn(const char *m1)
{
	++rc;
	/* "warning: <service>: <m1>\n" */
	out("warning: ", m1);
}
static void ok(const char *m1)
{
	errno = 0;
	out(OK, m1);
}

static int svstatus_get(void)
{
	int fd, r;

	fd = open("supervise/ok", O_WRONLY|O_NDELAY);
	if (fd == -1) {
		if (errno == ENODEV) {
			*acts == 'x' ? ok("runsv not running")
			             : failx("runsv not running");
			return 0;
		}
		warn("can't open supervise/ok");
		return -1;
	}
	close(fd);
	fd = open("supervise/status", O_RDONLY|O_NDELAY);
	if (fd == -1) {
		warn("can't open supervise/status");
		return -1;
	}
	r = read(fd, &svstatus, 20);
	close(fd);
	switch (r) {
	case 20:
		break;
	case -1:
		warn("can't read supervise/status");
		return -1;
	default:
		errno = 0;
		warn("can't read supervise/status: bad format");
		return -1;
	}
	return 1;
}

static unsigned svstatus_print(const char *m)
{
	int diff;
	int pid;
	int normallyup = 0;
	struct stat s;
	uint64_t timestamp;

	if (stat("down", &s) == -1) {
		if (errno != ENOENT) {
			bb_perror_msg(WARN"can't stat %s/down", *service);
			return 0;
		}
		normallyup = 1;
	}
	pid = SWAP_LE32(svstatus.pid_le32);
	timestamp = SWAP_BE64(svstatus.time_be64);
	switch (svstatus.run_or_finish) {
		case 0: printf("down: "); break;
		case 1: printf("run: "); break;
		case 2: printf("finish: "); break;
	}
	printf("%s: ", m);
	if (svstatus.run_or_finish)
		printf("(pid %d) ", pid);
	diff = tnow - timestamp;
	printf("%us", (diff < 0 ? 0 : diff));
	if (pid) {
		if (!normallyup) printf(", normally down");
		if (svstatus.paused) printf(", paused");
		if (svstatus.want == 'd') printf(", want down");
		if (svstatus.got_term) printf(", got TERM");
	} else {
		if (normallyup) printf(", normally up");
		if (svstatus.want == 'u') printf(", want up");
	}
	return pid ? 1 : 2;
}

static int status(const char *unused UNUSED_PARAM)
{
	int r;

	if (svstatus_get() <= 0)
		return 0;

	r = svstatus_print(*service);
	islog = 1;
	if (chdir("log") == -1) {
		if (errno != ENOENT) {
			printf("; ");
			warn("can't change directory");
		} else
			bb_putchar('\n');
	} else {
		printf("; ");
		if (svstatus_get()) {
			r = svstatus_print("log");
			bb_putchar('\n');
		}
	}
	islog = 0;
	return r;
}

static int checkscript(void)
{
	char *prog[2];
	struct stat s;
	int pid, w;

	if (stat("check", &s) == -1) {
		if (errno == ENOENT) return 1;
		bb_perror_msg(WARN"can't stat %s/check", *service);
		return 0;
	}
	/* if (!(s.st_mode & S_IXUSR)) return 1; */
	prog[0] = (char*)"./check";
	prog[1] = NULL;
	pid = spawn(prog);
	if (pid <= 0) {
		bb_perror_msg(WARN"can't %s child %s/check", "run", *service);
		return 0;
	}
	while (safe_waitpid(pid, &w, 0) == -1) {
		bb_perror_msg(WARN"can't %s child %s/check", "wait for", *service);
		return 0;
	}
	return WEXITSTATUS(w) == 0;
}

static int check(const char *a)
{
	int r;
	unsigned pid_le32;
	uint64_t timestamp;

	r = svstatus_get();
	if (r == -1)
		return -1;
	while (*a) {
		if (r == 0) {
			if (*a == 'x')
				return 1;
			return -1;
		}
		pid_le32 = svstatus.pid_le32;
		switch (*a) {
		case 'x':
			return 0;
		case 'u':
			if (!pid_le32 || svstatus.run_or_finish != 1)
				return 0;
			if (!checkscript())
				return 0;
			break;
		case 'd':
			if (pid_le32 || svstatus.run_or_finish != 0)
				return 0;
			break;
		case 'C':
			if (pid_le32 && !checkscript())
				return 0;
			break;
		case 't':
		case 'k':
			if (!pid_le32 && svstatus.want == 'd')
				break;
			timestamp = SWAP_BE64(svstatus.time_be64);
			if ((tstart > timestamp) || !pid_le32 || svstatus.got_term || !checkscript())
				return 0;
			break;
		case 'o':
			timestamp = SWAP_BE64(svstatus.time_be64);
			if ((!pid_le32 && tstart > timestamp) || (pid_le32 && svstatus.want != 'd'))
				return 0;
			break;
		case 'p':
			if (pid_le32 && !svstatus.paused)
				return 0;
			break;
		case 'c':
			if (pid_le32 && svstatus.paused)
				return 0;
			break;
		}
		++a;
	}
	printf(OK);
	svstatus_print(*service);
	bb_putchar('\n'); /* will also flush the output */
	return 1;
}

static int control(const char *a)
{
	int fd, r, l;

	if (svstatus_get() <= 0)
		return -1;
	if (svstatus.want == *a && (*a != 'd' || svstatus.got_term == 1))
		return 0;
	fd = open("supervise/control", O_WRONLY|O_NDELAY);
	if (fd == -1) {
		if (errno != ENODEV)
			warn("can't open supervise/control");
		else
			*a == 'x' ? ok("runsv not running") : failx("runsv not running");
		return -1;
	}
	l = strlen(a);
	r = write(fd, a, l);
	close(fd);
	if (r != l) {
		warn("can't write to supervise/control");
		return -1;
	}
	return 1;
}

//usage:#define sv_trivial_usage
//usage:       "[-v] [-w SEC] CMD SERVICE_DIR..."
//usage:#define sv_full_usage "\n\n"
//usage:       "Control services monitored by runsv supervisor.\n"
//usage:       "Commands (only first character is enough):\n"
//usage:       "\n"
//usage:       "status: query service status\n"
//usage:       "up: if service isn't running, start it. If service stops, restart it\n"
//usage:       "once: like 'up', but if service stops, don't restart it\n"
//usage:       "down: send TERM and CONT signals. If ./run exits, start ./finish\n"
//usage:       "	if it exists. After it stops, don't restart service\n"
//usage:       "exit: send TERM and CONT signals to service and log service. If they exit,\n"
//usage:       "	runsv exits too\n"
//usage:       "pause, cont, hup, alarm, interrupt, quit, 1, 2, term, kill: send\n"
//usage:       "STOP, CONT, HUP, ALRM, INT, QUIT, USR1, USR2, TERM, KILL signal to service"
static int sv(char **argv)
{
	char *x;
	char *action;
	const char *varservice = CONFIG_SV_DEFAULT_SERVICE_DIR;
	unsigned waitsec = 7;
	smallint kll = 0;
	int verbose = 0;
	int (*act)(const char*);
	int (*cbk)(const char*);
	int curdir;

	INIT_G();

	xfunc_error_retval = 100;

	x = getenv("SVDIR");
	if (x) varservice = x;
	x = getenv("SVWAIT");
	if (x) waitsec = xatou(x);

	getopt32(argv, "^" "w:+v" "\0" "vv" /* -w N, -v is a counter */,
			&waitsec, &verbose
	);
	argv += optind;
	action = *argv++;
	if (!action || !*argv) bb_show_usage();

	tnow = time(NULL) + 0x400000000000000aULL;
	tstart = tnow;
	curdir = open(".", O_RDONLY|O_NDELAY);
	if (curdir == -1)
		fatal_cannot("open current directory");

	act = &control;
	acts = "s";
	cbk = &check;

	switch (*action) {
	case 'x':
	case 'e':
		acts = "x";
		if (!verbose) cbk = NULL;
		break;
	case 'X':
	case 'E':
		acts = "x";
		kll = 1;
		break;
	case 'D':
		acts = "d";
		kll = 1;
		break;
	case 'T':
		acts = "tc";
		kll = 1;
		break;
	case 't':
		if (str_equal(action, "try-restart")) {
			acts = "tc";
			break;
		}
	case 'c':
		if (str_equal(action, "check")) {
			act = NULL;
			acts = "C";
			break;
		}
	case 'u': case 'd': case 'o': case 'p': case 'h':
	case 'a': case 'i': case 'k': case 'q': case '1': case '2':
		action[1] = '\0';
		acts = action;
		if (!verbose)
			cbk = NULL;
		break;
	case 's':
		if (str_equal(action, "shutdown")) {
			acts = "x";
			break;
		}
		if (str_equal(action, "start")) {
			acts = "u";
			break;
		}
		if (str_equal(action, "stop")) {
			acts = "d";
			break;
		}
		/* "status" */
		act = &status;
		cbk = NULL;
		break;
	case 'r':
		if (str_equal(action, "restart")) {
			acts = "tcu";
			break;
		}
		if (str_equal(action, "reload")) {
			acts = "h";
			break;
		}
		bb_show_usage();
	case 'f':
		if (str_equal(action, "force-reload")) {
			acts = "tc";
			kll = 1;
			break;
		}
		if (str_equal(action, "force-restart")) {
			acts = "tcu";
			kll = 1;
			break;
		}
		if (str_equal(action, "force-shutdown")) {
			acts = "x";
			kll = 1;
			break;
		}
		if (str_equal(action, "force-stop")) {
			acts = "d";
			kll = 1;
			break;
		}
	default:
		bb_show_usage();
	}

	service = argv;
	while ((x = *service) != NULL) {
		if (x[0] != '/' && x[0] != '.'
		 && x[0] != '\0' && x[strlen(x) - 1] != '/'
		) {
			if (chdir(varservice) == -1)
				goto chdir_failed_0;
		}
		if (chdir(x) == -1) {
 chdir_failed_0:
			fail("can't change to service directory");
			goto nullify_service_0;
		}
		if (act && (act(acts) == -1)) {
 nullify_service_0:
			*service = (char*) -1L; /* "dead" */
		}
		if (fchdir(curdir) == -1)
			fatal_cannot("change to original directory");
		service++;
	}

	if (cbk) while (1) {
		int want_exit;
		int diff;

		diff = tnow - tstart;
		service = argv;
		want_exit = 1;
		while ((x = *service) != NULL) {
			if (x == (char*) -1L) /* "dead" */
				goto next;
			if (x[0] != '/' && x[0] != '.') {
				if (chdir(varservice) == -1)
					goto chdir_failed;
			}
			if (chdir(x) == -1) {
 chdir_failed:
				fail("can't change to service directory");
				goto nullify_service;
			}
			if (cbk(acts) != 0)
				goto nullify_service;
			want_exit = 0;
			if (diff >= waitsec) {
				printf(kll ? "kill: " : "timeout: ");
				if (svstatus_get() > 0) {
					svstatus_print(x);
					++rc;
				}
				bb_putchar('\n'); /* will also flush the output */
				if (kll)
					control("k");
 nullify_service:
				*service = (char*) -1L; /* "dead" */
			}
			if (fchdir(curdir) == -1)
				fatal_cannot("change to original directory");
 next:
			service++;
		}
		if (want_exit) break;
		usleep(420000);
		tnow = time(NULL) + 0x400000000000000aULL;
	}
	return rc > 99 ? 99 : rc;
}

#if ENABLE_SV
int sv_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int sv_main(int argc UNUSED_PARAM, char **argv)
{
	return sv(argv);
}
#endif

//usage:#define svc_trivial_usage
//usage:       "[-udopchaitkx] SERVICE_DIR..."
//usage:#define svc_full_usage "\n\n"
//usage:       "Control services monitored by runsv supervisor"
//usage:   "\n"
//usage:   "\n""	-u	If service is not running, start it; restart if it stops"
//usage:   "\n""	-d	If service is running, send TERM+CONT signals; do not restart it"
//usage:   "\n""	-o	Once: if service is not running, start it; do not restart it"
//usage:   "\n""	-pchaitk Send STOP, CONT, HUP, ALRM, INT, TERM, KILL signal to service"
//usage:   "\n""	-x	Exit: runsv will exit as soon as the service is down"
#if ENABLE_SVC
int svc_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int svc_main(int argc UNUSED_PARAM, char **argv)
{
	char command[2];
	const char *optstring;
	unsigned opts;

	optstring = "udopchaitkx";
	opts = getopt32(argv, optstring);
	argv += optind;
	if (!argv[0] || !opts)
		bb_show_usage();

	argv -= 2;
	if (optind > 2) {
		argv--;
		argv[2] = (char*)"--";
	}
	argv[0] = (char*)"sv";
	argv[1] = command;
	command[1] = '\0';

	do {
		if (opts & 1) {
			int r;

			command[0] = *optstring;

			/* getopt() was already called by getopt32():
			 * reset the libc getopt() function's internal state.
			 */
			GETOPT_RESET();
			r = sv(argv);
			if (r)
				return 1;
		}
		optstring++;
		opts >>= 1;
	} while (opts);

	return 0;
}
#endif