summaryrefslogtreecommitdiff
path: root/t/helper/test-simple-ipc.c
blob: 42040ef81b1e8414b4c35d3f4cef566d7d9d01d6 (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
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
/*
 * test-simple-ipc.c: verify that the Inter-Process Communication works.
 */

#include "test-tool.h"
#include "cache.h"
#include "strbuf.h"
#include "simple-ipc.h"
#include "parse-options.h"
#include "thread-utils.h"
#include "strvec.h"

#ifndef SUPPORTS_SIMPLE_IPC
int cmd__simple_ipc(int argc, const char **argv)
{
	die("simple IPC not available on this platform");
}
#else

/*
 * The test daemon defines an "application callback" that supports a
 * series of commands (see `test_app_cb()`).
 *
 * Unknown commands are caught here and we send an error message back
 * to the client process.
 */
static int app__unhandled_command(const char *command,
				  ipc_server_reply_cb *reply_cb,
				  struct ipc_server_reply_data *reply_data)
{
	struct strbuf buf = STRBUF_INIT;
	int ret;

	strbuf_addf(&buf, "unhandled command: %s", command);
	ret = reply_cb(reply_data, buf.buf, buf.len);
	strbuf_release(&buf);

	return ret;
}

/*
 * Reply with a single very large buffer.  This is to ensure that
 * long response are properly handled -- whether the chunking occurs
 * in the kernel or in the (probably pkt-line) layer.
 */
#define BIG_ROWS (10000)
static int app__big_command(ipc_server_reply_cb *reply_cb,
			    struct ipc_server_reply_data *reply_data)
{
	struct strbuf buf = STRBUF_INIT;
	int row;
	int ret;

	for (row = 0; row < BIG_ROWS; row++)
		strbuf_addf(&buf, "big: %.75d\n", row);

	ret = reply_cb(reply_data, buf.buf, buf.len);
	strbuf_release(&buf);

	return ret;
}

/*
 * Reply with a series of lines.  This is to ensure that we can incrementally
 * compute the response and chunk it to the client.
 */
#define CHUNK_ROWS (10000)
static int app__chunk_command(ipc_server_reply_cb *reply_cb,
			      struct ipc_server_reply_data *reply_data)
{
	struct strbuf buf = STRBUF_INIT;
	int row;
	int ret;

	for (row = 0; row < CHUNK_ROWS; row++) {
		strbuf_setlen(&buf, 0);
		strbuf_addf(&buf, "big: %.75d\n", row);
		ret = reply_cb(reply_data, buf.buf, buf.len);
	}

	strbuf_release(&buf);

	return ret;
}

/*
 * Slowly reply with a series of lines.  This is to model an expensive to
 * compute chunked response (which might happen if this callback is running
 * in a thread and is fighting for a lock with other threads).
 */
#define SLOW_ROWS     (1000)
#define SLOW_DELAY_MS (10)
static int app__slow_command(ipc_server_reply_cb *reply_cb,
			     struct ipc_server_reply_data *reply_data)
{
	struct strbuf buf = STRBUF_INIT;
	int row;
	int ret;

	for (row = 0; row < SLOW_ROWS; row++) {
		strbuf_setlen(&buf, 0);
		strbuf_addf(&buf, "big: %.75d\n", row);
		ret = reply_cb(reply_data, buf.buf, buf.len);
		sleep_millisec(SLOW_DELAY_MS);
	}

	strbuf_release(&buf);

	return ret;
}

/*
 * The client sent a command followed by a (possibly very) large buffer.
 */
static int app__sendbytes_command(const char *received,
				  ipc_server_reply_cb *reply_cb,
				  struct ipc_server_reply_data *reply_data)
{
	struct strbuf buf_resp = STRBUF_INIT;
	const char *p = "?";
	int len_ballast = 0;
	int k;
	int errs = 0;
	int ret;

	if (skip_prefix(received, "sendbytes ", &p))
		len_ballast = strlen(p);

	/*
	 * Verify that the ballast is n copies of a single letter.
	 * And that the multi-threaded IO layer didn't cross the streams.
	 */
	for (k = 1; k < len_ballast; k++)
		if (p[k] != p[0])
			errs++;

	if (errs)
		strbuf_addf(&buf_resp, "errs:%d\n", errs);
	else
		strbuf_addf(&buf_resp, "rcvd:%c%08d\n", p[0], len_ballast);

	ret = reply_cb(reply_data, buf_resp.buf, buf_resp.len);

	strbuf_release(&buf_resp);

	return ret;
}

/*
 * An arbitrary fixed address to verify that the application instance
 * data is handled properly.
 */
static int my_app_data = 42;

static ipc_server_application_cb test_app_cb;

/*
 * This is the "application callback" that sits on top of the
 * "ipc-server".  It completely defines the set of commands supported
 * by this application.
 */
static int test_app_cb(void *application_data,
		       const char *command,
		       ipc_server_reply_cb *reply_cb,
		       struct ipc_server_reply_data *reply_data)
{
	/*
	 * Verify that we received the application-data that we passed
	 * when we started the ipc-server.  (We have several layers of
	 * callbacks calling callbacks and it's easy to get things mixed
	 * up (especially when some are "void*").)
	 */
	if (application_data != (void*)&my_app_data)
		BUG("application_cb: application_data pointer wrong");

	if (!strcmp(command, "quit")) {
		/*
		 * The client sent a "quit" command.  This is an async
		 * request for the server to shutdown.
		 *
		 * We DO NOT send the client a response message
		 * (because we have nothing to say and the other
		 * server threads have not yet stopped).
		 *
		 * Tell the ipc-server layer to start shutting down.
		 * This includes: stop listening for new connections
		 * on the socket/pipe and telling all worker threads
		 * to finish/drain their outgoing responses to other
		 * clients.
		 *
		 * This DOES NOT force an immediate sync shutdown.
		 */
		return SIMPLE_IPC_QUIT;
	}

	if (!strcmp(command, "ping")) {
		const char *answer = "pong";
		return reply_cb(reply_data, answer, strlen(answer));
	}

	if (!strcmp(command, "big"))
		return app__big_command(reply_cb, reply_data);

	if (!strcmp(command, "chunk"))
		return app__chunk_command(reply_cb, reply_data);

	if (!strcmp(command, "slow"))
		return app__slow_command(reply_cb, reply_data);

	if (starts_with(command, "sendbytes "))
		return app__sendbytes_command(command, reply_cb, reply_data);

	return app__unhandled_command(command, reply_cb, reply_data);
}

struct cl_args
{
	const char *subcommand;
	const char *path;
	const char *token;

	int nr_threads;
	int max_wait_sec;
	int bytecount;
	int batchsize;

	char bytevalue;
};

static struct cl_args cl_args = {
	.subcommand = NULL,
	.path = "ipc-test",
	.token = NULL,

	.nr_threads = 5,
	.max_wait_sec = 60,
	.bytecount = 1024,
	.batchsize = 10,

	.bytevalue = 'x',
};

/*
 * This process will run as a simple-ipc server and listen for IPC commands
 * from client processes.
 */
static int daemon__run_server(void)
{
	int ret;

	struct ipc_server_opts opts = {
		.nr_threads = cl_args.nr_threads,
	};

	/*
	 * Synchronously run the ipc-server.  We don't need any application
	 * instance data, so pass an arbitrary pointer (that we'll later
	 * verify made the round trip).
	 */
	ret = ipc_server_run(cl_args.path, &opts, test_app_cb, (void*)&my_app_data);
	if (ret == -2)
		error(_("socket/pipe already in use: '%s'"), cl_args.path);
	else if (ret == -1)
		error_errno(_("could not start server on: '%s'"), cl_args.path);

	return ret;
}

#ifndef GIT_WINDOWS_NATIVE
/*
 * This is adapted from `daemonize()`.  Use `fork()` to directly create and
 * run the daemon in a child process.
 */
static int spawn_server(pid_t *pid)
{
	struct ipc_server_opts opts = {
		.nr_threads = cl_args.nr_threads,
	};

	*pid = fork();

	switch (*pid) {
	case 0:
		if (setsid() == -1)
			error_errno(_("setsid failed"));
		close(0);
		close(1);
		close(2);
		sanitize_stdfds();

		return ipc_server_run(cl_args.path, &opts, test_app_cb,
				      (void*)&my_app_data);

	case -1:
		return error_errno(_("could not spawn daemon in the background"));

	default:
		return 0;
	}
}
#else
/*
 * Conceptually like `daemonize()` but different because Windows does not
 * have `fork(2)`.  Spawn a normal Windows child process but without the
 * limitations of `start_command()` and `finish_command()`.
 */
static int spawn_server(pid_t *pid)
{
	char test_tool_exe[MAX_PATH];
	struct strvec args = STRVEC_INIT;
	int in, out;

	GetModuleFileNameA(NULL, test_tool_exe, MAX_PATH);

	in = open("/dev/null", O_RDONLY);
	out = open("/dev/null", O_WRONLY);

	strvec_push(&args, test_tool_exe);
	strvec_push(&args, "simple-ipc");
	strvec_push(&args, "run-daemon");
	strvec_pushf(&args, "--name=%s", cl_args.path);
	strvec_pushf(&args, "--threads=%d", cl_args.nr_threads);

	*pid = mingw_spawnvpe(args.v[0], args.v, NULL, NULL, in, out, out);
	close(in);
	close(out);

	strvec_clear(&args);

	if (*pid < 0)
		return error(_("could not spawn daemon in the background"));

	return 0;
}
#endif

/*
 * This is adapted from `wait_or_whine()`.  Watch the child process and
 * let it get started and begin listening for requests on the socket
 * before reporting our success.
 */
static int wait_for_server_startup(pid_t pid_child)
{
	int status;
	pid_t pid_seen;
	enum ipc_active_state s;
	time_t time_limit, now;

	time(&time_limit);
	time_limit += cl_args.max_wait_sec;

	for (;;) {
		pid_seen = waitpid(pid_child, &status, WNOHANG);

		if (pid_seen == -1)
			return error_errno(_("waitpid failed"));

		else if (pid_seen == 0) {
			/*
			 * The child is still running (this should be
			 * the normal case).  Try to connect to it on
			 * the socket and see if it is ready for
			 * business.
			 *
			 * If there is another daemon already running,
			 * our child will fail to start (possibly
			 * after a timeout on the lock), but we don't
			 * care (who responds) if the socket is live.
			 */
			s = ipc_get_active_state(cl_args.path);
			if (s == IPC_STATE__LISTENING)
				return 0;

			time(&now);
			if (now > time_limit)
				return error(_("daemon not online yet"));

			continue;
		}

		else if (pid_seen == pid_child) {
			/*
			 * The new child daemon process shutdown while
			 * it was starting up, so it is not listening
			 * on the socket.
			 *
			 * Try to ping the socket in the odd chance
			 * that another daemon started (or was already
			 * running) while our child was starting.
			 *
			 * Again, we don't care who services the socket.
			 */
			s = ipc_get_active_state(cl_args.path);
			if (s == IPC_STATE__LISTENING)
				return 0;

			/*
			 * We don't care about the WEXITSTATUS() nor
			 * any of the WIF*(status) values because
			 * `cmd__simple_ipc()` does the `!!result`
			 * trick on all function return values.
			 *
			 * So it is sufficient to just report the
			 * early shutdown as an error.
			 */
			return error(_("daemon failed to start"));
		}

		else
			return error(_("waitpid is confused"));
	}
}

/*
 * This process will start a simple-ipc server in a background process and
 * wait for it to become ready.  This is like `daemonize()` but gives us
 * more control and better error reporting (and makes it easier to write
 * unit tests).
 */
static int daemon__start_server(void)
{
	pid_t pid_child;
	int ret;

	/*
	 * Run the actual daemon in a background process.
	 */
	ret = spawn_server(&pid_child);
	if (pid_child <= 0)
		return ret;

	/*
	 * Let the parent wait for the child process to get started
	 * and begin listening for requests on the socket.
	 */
	ret = wait_for_server_startup(pid_child);

	return ret;
}

/*
 * This process will run a quick probe to see if a simple-ipc server
 * is active on this path.
 *
 * Returns 0 if the server is alive.
 */
static int client__probe_server(void)
{
	enum ipc_active_state s;

	s = ipc_get_active_state(cl_args.path);
	switch (s) {
	case IPC_STATE__LISTENING:
		return 0;

	case IPC_STATE__NOT_LISTENING:
		return error("no server listening at '%s'", cl_args.path);

	case IPC_STATE__PATH_NOT_FOUND:
		return error("path not found '%s'", cl_args.path);

	case IPC_STATE__INVALID_PATH:
		return error("invalid pipe/socket name '%s'", cl_args.path);

	case IPC_STATE__OTHER_ERROR:
	default:
		return error("other error for '%s'", cl_args.path);
	}
}

/*
 * Send an IPC command token to an already-running server daemon and
 * print the response.
 *
 * This is a simple 1 word command/token that `test_app_cb()` (in the
 * daemon process) will understand.
 */
static int client__send_ipc(void)
{
	const char *command = "(no-command)";
	struct strbuf buf = STRBUF_INIT;
	struct ipc_client_connect_options options
		= IPC_CLIENT_CONNECT_OPTIONS_INIT;

	if (cl_args.token && *cl_args.token)
		command = cl_args.token;

	options.wait_if_busy = 1;
	options.wait_if_not_found = 0;

	if (!ipc_client_send_command(cl_args.path, &options, command, &buf)) {
		if (buf.len) {
			printf("%s\n", buf.buf);
			fflush(stdout);
		}
		strbuf_release(&buf);

		return 0;
	}

	return error("failed to send '%s' to '%s'", command, cl_args.path);
}

/*
 * Send an IPC command to an already-running server and ask it to
 * shutdown.  "send quit" is an async request and queues a shutdown
 * event in the server, so we spin and wait here for it to actually
 * shutdown to make the unit tests a little easier to write.
 */
static int client__stop_server(void)
{
	int ret;
	time_t time_limit, now;
	enum ipc_active_state s;

	time(&time_limit);
	time_limit += cl_args.max_wait_sec;

	cl_args.token = "quit";

	ret = client__send_ipc();
	if (ret)
		return ret;

	for (;;) {
		sleep_millisec(100);

		s = ipc_get_active_state(cl_args.path);

		if (s != IPC_STATE__LISTENING) {
			/*
			 * The socket/pipe is gone and/or has stopped
			 * responding.  Lets assume that the daemon
			 * process has exited too.
			 */
			return 0;
		}

		time(&now);
		if (now > time_limit)
			return error(_("daemon has not shutdown yet"));
	}
}

/*
 * Send an IPC command followed by ballast to confirm that a large
 * message can be sent and that the kernel or pkt-line layers will
 * properly chunk it and that the daemon receives the entire message.
 */
static int do_sendbytes(int bytecount, char byte, const char *path,
			const struct ipc_client_connect_options *options)
{
	struct strbuf buf_send = STRBUF_INIT;
	struct strbuf buf_resp = STRBUF_INIT;

	strbuf_addstr(&buf_send, "sendbytes ");
	strbuf_addchars(&buf_send, byte, bytecount);

	if (!ipc_client_send_command(path, options, buf_send.buf, &buf_resp)) {
		strbuf_rtrim(&buf_resp);
		printf("sent:%c%08d %s\n", byte, bytecount, buf_resp.buf);
		fflush(stdout);
		strbuf_release(&buf_send);
		strbuf_release(&buf_resp);

		return 0;
	}

	return error("client failed to sendbytes(%d, '%c') to '%s'",
		     bytecount, byte, path);
}

/*
 * Send an IPC command with ballast to an already-running server daemon.
 */
static int client__sendbytes(void)
{
	struct ipc_client_connect_options options
		= IPC_CLIENT_CONNECT_OPTIONS_INIT;

	options.wait_if_busy = 1;
	options.wait_if_not_found = 0;
	options.uds_disallow_chdir = 0;

	return do_sendbytes(cl_args.bytecount, cl_args.bytevalue, cl_args.path,
			    &options);
}

struct multiple_thread_data {
	pthread_t pthread_id;
	struct multiple_thread_data *next;
	const char *path;
	int bytecount;
	int batchsize;
	int sum_errors;
	int sum_good;
	char letter;
};

static void *multiple_thread_proc(void *_multiple_thread_data)
{
	struct multiple_thread_data *d = _multiple_thread_data;
	int k;
	struct ipc_client_connect_options options
		= IPC_CLIENT_CONNECT_OPTIONS_INIT;

	options.wait_if_busy = 1;
	options.wait_if_not_found = 0;
	/*
	 * A multi-threaded client should not be randomly calling chdir().
	 * The test will pass without this restriction because the test is
	 * not otherwise accessing the filesystem, but it makes us honest.
	 */
	options.uds_disallow_chdir = 1;

	trace2_thread_start("multiple");

	for (k = 0; k < d->batchsize; k++) {
		if (do_sendbytes(d->bytecount + k, d->letter, d->path, &options))
			d->sum_errors++;
		else
			d->sum_good++;
	}

	trace2_thread_exit();
	return NULL;
}

/*
 * Start a client-side thread pool.  Each thread sends a series of
 * IPC requests.  Each request is on a new connection to the server.
 */
static int client__multiple(void)
{
	struct multiple_thread_data *list = NULL;
	int k;
	int sum_join_errors = 0;
	int sum_thread_errors = 0;
	int sum_good = 0;

	for (k = 0; k < cl_args.nr_threads; k++) {
		struct multiple_thread_data *d = xcalloc(1, sizeof(*d));
		d->next = list;
		d->path = cl_args.path;
		d->bytecount = cl_args.bytecount + cl_args.batchsize*(k/26);
		d->batchsize = cl_args.batchsize;
		d->sum_errors = 0;
		d->sum_good = 0;
		d->letter = 'A' + (k % 26);

		if (pthread_create(&d->pthread_id, NULL, multiple_thread_proc, d)) {
			warning("failed to create thread[%d] skipping remainder", k);
			free(d);
			break;
		}

		list = d;
	}

	while (list) {
		struct multiple_thread_data *d = list;

		if (pthread_join(d->pthread_id, NULL))
			sum_join_errors++;

		sum_thread_errors += d->sum_errors;
		sum_good += d->sum_good;

		list = d->next;
		free(d);
	}

	printf("client (good %d) (join %d), (errors %d)\n",
	       sum_good, sum_join_errors, sum_thread_errors);

	return (sum_join_errors + sum_thread_errors) ? 1 : 0;
}

int cmd__simple_ipc(int argc, const char **argv)
{
	const char * const simple_ipc_usage[] = {
		N_("test-helper simple-ipc is-active    [<name>] [<options>]"),
		N_("test-helper simple-ipc run-daemon   [<name>] [<threads>]"),
		N_("test-helper simple-ipc start-daemon [<name>] [<threads>] [<max-wait>]"),
		N_("test-helper simple-ipc stop-daemon  [<name>] [<max-wait>]"),
		N_("test-helper simple-ipc send         [<name>] [<token>]"),
		N_("test-helper simple-ipc sendbytes    [<name>] [<bytecount>] [<byte>]"),
		N_("test-helper simple-ipc multiple     [<name>] [<threads>] [<bytecount>] [<batchsize>]"),
		NULL
	};

	const char *bytevalue = NULL;

	struct option options[] = {
#ifndef GIT_WINDOWS_NATIVE
		OPT_STRING(0, "name", &cl_args.path, N_("name"), N_("name or pathname of unix domain socket")),
#else
		OPT_STRING(0, "name", &cl_args.path, N_("name"), N_("named-pipe name")),
#endif
		OPT_INTEGER(0, "threads", &cl_args.nr_threads, N_("number of threads in server thread pool")),
		OPT_INTEGER(0, "max-wait", &cl_args.max_wait_sec, N_("seconds to wait for daemon to start or stop")),

		OPT_INTEGER(0, "bytecount", &cl_args.bytecount, N_("number of bytes")),
		OPT_INTEGER(0, "batchsize", &cl_args.batchsize, N_("number of requests per thread")),

		OPT_STRING(0, "byte", &bytevalue, N_("byte"), N_("ballast character")),
		OPT_STRING(0, "token", &cl_args.token, N_("token"), N_("command token to send to the server")),

		OPT_END()
	};

	if (argc < 2)
		usage_with_options(simple_ipc_usage, options);

	if (argc == 2 && !strcmp(argv[1], "-h"))
		usage_with_options(simple_ipc_usage, options);

	if (argc == 2 && !strcmp(argv[1], "SUPPORTS_SIMPLE_IPC"))
		return 0;

	cl_args.subcommand = argv[1];

	argc--;
	argv++;

	argc = parse_options(argc, argv, NULL, options, simple_ipc_usage, 0);

	if (cl_args.nr_threads < 1)
		cl_args.nr_threads = 1;
	if (cl_args.max_wait_sec < 0)
		cl_args.max_wait_sec = 0;
	if (cl_args.bytecount < 1)
		cl_args.bytecount = 1;
	if (cl_args.batchsize < 1)
		cl_args.batchsize = 1;

	if (bytevalue && *bytevalue)
		cl_args.bytevalue = bytevalue[0];

	/*
	 * Use '!!' on all dispatch functions to map from `error()` style
	 * (returns -1) style to `test_must_fail` style (expects 1).  This
	 * makes shell error messages less confusing.
	 */

	if (!strcmp(cl_args.subcommand, "is-active"))
		return !!client__probe_server();

	if (!strcmp(cl_args.subcommand, "run-daemon"))
		return !!daemon__run_server();

	if (!strcmp(cl_args.subcommand, "start-daemon"))
		return !!daemon__start_server();

	/*
	 * Client commands follow.  Ensure a server is running before
	 * sending any data.  This might be overkill, but then again
	 * this is a test harness.
	 */

	if (!strcmp(cl_args.subcommand, "stop-daemon")) {
		if (client__probe_server())
			return 1;
		return !!client__stop_server();
	}

	if (!strcmp(cl_args.subcommand, "send")) {
		if (client__probe_server())
			return 1;
		return !!client__send_ipc();
	}

	if (!strcmp(cl_args.subcommand, "sendbytes")) {
		if (client__probe_server())
			return 1;
		return !!client__sendbytes();
	}

	if (!strcmp(cl_args.subcommand, "multiple")) {
		if (client__probe_server())
			return 1;
		return !!client__multiple();
	}

	die("Unhandled subcommand: '%s'", cl_args.subcommand);
}
#endif