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c6f494e8 RP |
1 | /* Generic support for remote debugging interfaces. |
2 | ||
3 | Copyright 1993 Free Software Foundation, Inc. | |
4 | ||
5 | This file is part of GDB. | |
6 | ||
7 | This program is free software; you can redistribute it and/or modify | |
8 | it under the terms of the GNU General Public License as published by | |
9 | the Free Software Foundation; either version 2 of the License, or | |
10 | (at your option) any later version. | |
11 | ||
12 | This program is distributed in the hope that it will be useful, | |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | GNU General Public License for more details. | |
16 | ||
17 | You should have received a copy of the GNU General Public License | |
18 | along with this program; if not, write to the Free Software | |
19 | Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ | |
20 | ||
21 | /* This file actually contains two distinct logical "packages". They | |
22 | are packaged together in this one file because they are typically | |
23 | used together. | |
24 | ||
25 | The first package is an addition to the serial package. The | |
26 | addition provides reading and writing with debugging output and | |
27 | timeouts based on user settable variables. These routines are | |
28 | intended to support serial port based remote backends. These | |
29 | functions are prefixed with sr_. | |
30 | ||
31 | The second package is a collection of more or less generic | |
32 | functions for use by remote backends. They support user settable | |
33 | variables for debugging, retries, and the like. | |
34 | ||
35 | Todo: | |
36 | ||
37 | * a pass through mode a la kermit or telnet. | |
38 | * autobaud. | |
39 | * ask remote to change his baud rate. | |
c6f494e8 RP |
40 | */ |
41 | ||
42 | #include <ctype.h> | |
43 | ||
44 | #include "defs.h" | |
45 | #include "gdbcmd.h" | |
46 | #include "target.h" | |
47 | #include "serial.h" | |
48 | #include "gdbcore.h" /* for exec_bfd */ | |
49 | #include "inferior.h" /* for generic_mourn_inferior */ | |
50 | #include "remote-utils.h" | |
51 | ||
52 | struct _sr_settings sr_settings = { | |
c6f494e8 RP |
53 | 4, /* timeout: |
54 | remote-hms.c had 2 | |
55 | remote-bug.c had "with a timeout of 2, we time out waiting for | |
56 | the prompt after an s-record dump." | |
57 | ||
58 | remote.c had (2): This was 5 seconds, which is a long time to | |
59 | sit and wait. Unless this is going though some terminal server | |
60 | or multiplexer or other form of hairy serial connection, I | |
61 | would think 2 seconds would be plenty. | |
62 | */ | |
63 | ||
64 | 10, /* retries */ | |
65 | NULL, /* device */ | |
66 | NULL, /* descriptor */ | |
67 | }; | |
68 | ||
69 | struct gr_settings *gr_settings = NULL; | |
70 | ||
71 | static void | |
72 | usage(proto, junk) | |
73 | char *proto; | |
74 | char *junk; | |
75 | { | |
76 | if (junk != NULL) | |
199b2450 | 77 | fprintf_unfiltered(gdb_stderr, "Unrecognized arguments: `%s'.\n", junk); |
c6f494e8 RP |
78 | |
79 | /* FIXME-now: service@host? */ | |
80 | ||
81 | error("Usage: target %s <device <speed <debug>>>\n\ | |
82 | or target %s <host> <port>\n", proto, proto); | |
83 | ||
84 | return; | |
85 | } | |
86 | ||
87 | #define CHECKDONE(p, q) \ | |
88 | { \ | |
89 | if (q == p) \ | |
90 | { \ | |
91 | if (*p == '\0') \ | |
92 | return; \ | |
93 | else \ | |
94 | usage(proto, p); \ | |
95 | } \ | |
96 | } | |
97 | ||
98 | void | |
99 | sr_scan_args(proto, args) | |
100 | char *proto; | |
101 | char *args; | |
102 | { | |
103 | int n; | |
104 | char *p, *q; | |
105 | ||
106 | extern int strtol(); | |
107 | ||
108 | /* if no args, then nothing to do. */ | |
109 | if (args == NULL || *args == '\0') | |
110 | return; | |
111 | ||
112 | /* scan off white space. */ | |
113 | for (p = args; isspace(*p); ++p) ;; | |
114 | ||
115 | /* find end of device name. */ | |
116 | for (q = p; *q != '\0' && !isspace(*q); ++q) ;; | |
117 | ||
118 | /* check for missing or empty device name. */ | |
119 | CHECKDONE(p, q); | |
120 | sr_set_device(savestring(p, q - p)); | |
121 | ||
122 | /* look for baud rate. */ | |
123 | n = strtol(q, &p, 10); | |
124 | ||
125 | /* check for missing or empty baud rate. */ | |
126 | CHECKDONE(p, q); | |
127 | sr_set_baud_rate(n); | |
128 | ||
129 | /* look for debug value. */ | |
130 | n = strtol(p, &q, 10); | |
131 | ||
132 | /* check for missing or empty debug value. */ | |
133 | CHECKDONE(p, q); | |
134 | sr_set_debug(n); | |
135 | ||
136 | /* scan off remaining white space. */ | |
137 | for (p = q; isspace(*p); ++p) ;; | |
138 | ||
139 | /* if not end of string, then there's unrecognized junk. */ | |
140 | if (*p != '\0') | |
141 | usage(proto, p); | |
142 | ||
143 | return; | |
144 | } | |
145 | ||
146 | void | |
147 | gr_generic_checkin() | |
148 | { | |
149 | sr_write_cr(""); | |
150 | gr_expect_prompt(); | |
151 | } | |
152 | ||
153 | void | |
154 | gr_open(args, from_tty, gr) | |
155 | char *args; | |
156 | int from_tty; | |
157 | struct gr_settings *gr; | |
158 | { | |
159 | target_preopen(from_tty); | |
160 | sr_scan_args(gr->ops->to_shortname, args); | |
161 | unpush_target(gr->ops); | |
162 | ||
163 | gr_settings = gr; | |
164 | ||
165 | gr_set_dcache(dcache_init(gr->readfunc, gr->writefunc)); | |
166 | ||
167 | if (sr_get_desc() != NULL) | |
168 | gr_close (0); | |
169 | ||
170 | sr_set_desc(SERIAL_OPEN (sr_get_device())); | |
171 | if (!sr_get_desc()) | |
172 | perror_with_name((char *) sr_get_device()); | |
173 | ||
174 | if (SERIAL_SETBAUDRATE(sr_get_desc(), sr_get_baud_rate()) != 0) | |
175 | { | |
176 | SERIAL_CLOSE(sr_get_desc()); | |
177 | perror_with_name(sr_get_device()); | |
178 | } | |
179 | ||
180 | SERIAL_RAW (sr_get_desc()); | |
181 | ||
e15f2a54 JK |
182 | /* If there is something sitting in the buffer we might take it as a |
183 | response to a command, which would be bad. */ | |
184 | SERIAL_FLUSH_INPUT (sr_get_desc ()); | |
185 | ||
c6f494e8 RP |
186 | /* default retries */ |
187 | if (sr_get_retries() == 0) | |
188 | sr_set_retries(1); | |
189 | ||
190 | /* default clear breakpoint function */ | |
191 | if (gr_settings->clear_all_breakpoints == NULL) | |
192 | gr_settings->clear_all_breakpoints = remove_breakpoints; | |
193 | ||
194 | if (from_tty) | |
195 | printf_filtered ("Remote debugging using `%s' at baud rate of %d\n", | |
196 | sr_get_device(), sr_get_baud_rate()); | |
197 | ||
198 | push_target(gr->ops); | |
199 | gr_checkin(); | |
200 | gr_clear_all_breakpoints (); | |
201 | return; | |
202 | } | |
203 | ||
204 | /* Read a character from the remote system masking it down to 7 bits | |
205 | and doing all the fancy timeout stuff. */ | |
206 | ||
207 | int | |
208 | sr_readchar () | |
209 | { | |
210 | int buf; | |
211 | ||
212 | buf = SERIAL_READCHAR (sr_get_desc(), sr_get_timeout()); | |
213 | ||
214 | if (buf == SERIAL_TIMEOUT) | |
215 | error ("Timeout reading from remote system."); | |
216 | ||
217 | if (sr_get_debug() > 0) | |
199b2450 | 218 | printf_unfiltered ("%c", buf); |
c6f494e8 RP |
219 | |
220 | return buf & 0x7f; | |
221 | } | |
222 | ||
223 | int | |
224 | sr_pollchar() | |
225 | { | |
226 | int buf; | |
227 | ||
228 | buf = SERIAL_READCHAR (sr_get_desc(), 0); | |
229 | if (buf == SERIAL_TIMEOUT) | |
230 | buf = 0; | |
231 | if (sr_get_debug() > 0) | |
232 | if (buf) | |
199b2450 | 233 | printf_unfiltered ("%c", buf); |
c6f494e8 | 234 | else |
199b2450 | 235 | printf_unfiltered ("<empty character poll>"); |
c6f494e8 RP |
236 | |
237 | return buf & 0x7f; | |
238 | } | |
239 | ||
240 | /* Keep discarding input from the remote system, until STRING is found. | |
241 | Let the user break out immediately. */ | |
242 | void | |
243 | sr_expect (string) | |
244 | char *string; | |
245 | { | |
246 | char *p = string; | |
247 | ||
248 | immediate_quit = 1; | |
249 | while (1) | |
250 | { | |
251 | if (sr_readchar () == *p) | |
252 | { | |
253 | p++; | |
254 | if (*p == '\0') | |
255 | { | |
256 | immediate_quit = 0; | |
257 | return; | |
258 | } | |
259 | } | |
260 | else | |
261 | p = string; | |
262 | } | |
263 | } | |
264 | ||
265 | void | |
266 | sr_write (a, l) | |
267 | char *a; | |
268 | int l; | |
269 | { | |
270 | int i; | |
271 | ||
272 | if (SERIAL_WRITE (sr_get_desc(), a, l) != 0) | |
273 | perror_with_name ("sr_write: Error writing to remote"); | |
274 | ||
275 | if (sr_get_debug() > 0) | |
276 | for (i = 0; i < l; i++) | |
199b2450 | 277 | printf_unfiltered ("%c", a[i]); |
c6f494e8 RP |
278 | |
279 | return; | |
280 | } | |
281 | ||
282 | void | |
283 | sr_write_cr (s) | |
284 | char *s; | |
285 | { | |
286 | sr_write (s, strlen (s)); | |
287 | sr_write ("\r", 1); | |
288 | return; | |
289 | } | |
290 | ||
291 | int | |
292 | sr_timed_read (buf, n) | |
293 | char *buf; | |
294 | int n; | |
295 | { | |
296 | int i; | |
297 | char c; | |
298 | ||
299 | i = 0; | |
300 | while (i < n) | |
301 | { | |
302 | c = sr_readchar (); | |
303 | ||
304 | if (c == 0) | |
305 | return i; | |
306 | buf[i] = c; | |
307 | i++; | |
308 | ||
309 | } | |
310 | return i; | |
311 | } | |
312 | ||
313 | /* Get a hex digit from the remote system & return its value. If | |
314 | ignore_space is nonzero, ignore spaces (not newline, tab, etc). */ | |
315 | ||
316 | int | |
317 | sr_get_hex_digit (ignore_space) | |
318 | int ignore_space; | |
319 | { | |
320 | int ch; | |
321 | ||
322 | while (1) | |
323 | { | |
324 | ch = sr_readchar (); | |
325 | if (ch >= '0' && ch <= '9') | |
326 | return ch - '0'; | |
327 | else if (ch >= 'A' && ch <= 'F') | |
328 | return ch - 'A' + 10; | |
329 | else if (ch >= 'a' && ch <= 'f') | |
330 | return ch - 'a' + 10; | |
331 | else if (ch != ' ' || !ignore_space) | |
332 | { | |
333 | gr_expect_prompt (); | |
334 | error ("Invalid hex digit from remote system."); | |
335 | } | |
336 | } | |
337 | } | |
338 | ||
339 | /* Get a byte from the remote and put it in *BYT. Accept any number | |
340 | leading spaces. */ | |
341 | void | |
342 | sr_get_hex_byte (byt) | |
343 | char *byt; | |
344 | { | |
345 | int val; | |
346 | ||
347 | val = sr_get_hex_digit (1) << 4; | |
348 | val |= sr_get_hex_digit (0); | |
349 | *byt = val; | |
350 | } | |
351 | ||
352 | /* Read a 32-bit hex word from the remote, preceded by a space */ | |
353 | long | |
354 | sr_get_hex_word () | |
355 | { | |
356 | long val; | |
357 | int j; | |
358 | ||
359 | val = 0; | |
360 | for (j = 0; j < 8; j++) | |
361 | val = (val << 4) + sr_get_hex_digit (j == 0); | |
362 | return val; | |
363 | } | |
364 | ||
365 | /* Put a command string, in args, out to the remote. The remote is assumed to | |
366 | be in raw mode, all writing/reading done through desc. | |
367 | Ouput from the remote is placed on the users terminal until the | |
368 | prompt from the remote is seen. | |
369 | FIXME: Can't handle commands that take input. */ | |
370 | ||
371 | void | |
372 | sr_com (args, fromtty) | |
373 | char *args; | |
374 | int fromtty; | |
375 | { | |
376 | sr_check_open (); | |
377 | ||
378 | if (!args) | |
379 | return; | |
380 | ||
381 | /* Clear all input so only command relative output is displayed */ | |
382 | ||
383 | sr_write_cr (args); | |
384 | sr_write ("\030", 1); | |
385 | gr_expect_prompt (); | |
386 | } | |
387 | ||
388 | void | |
389 | gr_close(quitting) | |
390 | int quitting; | |
391 | { | |
392 | gr_clear_all_breakpoints(); | |
393 | ||
394 | if (sr_is_open()) | |
395 | { | |
396 | SERIAL_CLOSE (sr_get_desc()); | |
397 | sr_set_desc(NULL); | |
398 | } | |
399 | ||
400 | return; | |
401 | } | |
402 | ||
403 | /* gr_detach() | |
404 | takes a program previously attached to and detaches it. | |
405 | We better not have left any breakpoints | |
406 | in the program or it'll die when it hits one. | |
407 | Close the open connection to the remote debugger. | |
408 | Use this when you want to detach and do something else | |
409 | with your gdb. */ | |
410 | ||
411 | void | |
412 | gr_detach(args, from_tty) | |
413 | char *args; | |
414 | int from_tty; | |
415 | { | |
416 | if (args) | |
417 | error ("Argument given to \"detach\" when remotely debugging."); | |
418 | ||
419 | if (sr_is_open()) | |
420 | gr_clear_all_breakpoints (); | |
421 | ||
422 | pop_target (); | |
423 | if (from_tty) | |
424 | puts_filtered ("Ending remote debugging.\n"); | |
425 | ||
426 | return; | |
427 | } | |
428 | ||
429 | void | |
430 | gr_files_info (ops) | |
431 | struct target_ops *ops; | |
432 | { | |
433 | char *file = "nothing"; | |
434 | ||
435 | if (exec_bfd) | |
436 | file = bfd_get_filename (exec_bfd); | |
437 | ||
438 | if (exec_bfd) | |
439 | { | |
440 | #ifdef __GO32__ | |
441 | printf_filtered ("\tAttached to DOS asynctsr\n"); | |
442 | #else | |
443 | printf_filtered ("\tAttached to %s at %d baud\n", | |
444 | sr_get_device(), sr_get_baud_rate()); | |
445 | #endif | |
446 | } | |
447 | ||
448 | printf_filtered ("\tand running program %s\n", file); | |
449 | printf_filtered ("\tusing the %s protocol.\n", ops->to_shortname); | |
450 | } | |
451 | ||
452 | void | |
453 | gr_mourn () | |
454 | { | |
455 | gr_clear_all_breakpoints (); | |
456 | unpush_target (gr_get_ops()); | |
457 | generic_mourn_inferior (); | |
458 | } | |
459 | ||
460 | void | |
461 | gr_kill () | |
462 | { | |
463 | return; | |
464 | } | |
465 | ||
466 | /* This is called not only when we first attach, but also when the | |
467 | user types "run" after having attached. */ | |
468 | void | |
469 | gr_create_inferior (execfile, args, env) | |
470 | char *execfile; | |
471 | char *args; | |
472 | char **env; | |
473 | { | |
474 | int entry_pt; | |
475 | ||
476 | if (args && *args) | |
477 | error ("Can't pass arguments to remote process."); | |
478 | ||
479 | if (execfile == 0 || exec_bfd == 0) | |
480 | error ("No exec file specified"); | |
481 | ||
482 | entry_pt = (int) bfd_get_start_address (exec_bfd); | |
483 | sr_check_open (); | |
484 | ||
485 | gr_kill (); | |
486 | gr_clear_all_breakpoints (); | |
487 | ||
488 | init_wait_for_inferior (); | |
489 | gr_checkin(); | |
490 | ||
491 | insert_breakpoints (); /* Needed to get correct instruction in cache */ | |
492 | proceed (entry_pt, -1, 0); | |
493 | } | |
494 | ||
495 | /* Given a null terminated list of strings LIST, read the input until we find one of | |
496 | them. Return the index of the string found or -1 on error. '?' means match | |
497 | any single character. Note that with the algorithm we use, the initial | |
498 | character of the string cannot recur in the string, or we will not find some | |
499 | cases of the string in the input. If PASSTHROUGH is non-zero, then | |
500 | pass non-matching data on. */ | |
501 | ||
502 | int | |
503 | gr_multi_scan (list, passthrough) | |
504 | char *list[]; | |
505 | int passthrough; | |
506 | { | |
507 | char *swallowed = NULL; /* holding area */ | |
508 | char *swallowed_p = swallowed; /* Current position in swallowed. */ | |
509 | int ch; | |
510 | int ch_handled; | |
511 | int i; | |
512 | int string_count; | |
513 | int max_length; | |
514 | char **plist; | |
515 | ||
516 | /* Look through the strings. Count them. Find the largest one so we can | |
517 | allocate a holding area. */ | |
518 | ||
519 | for (max_length = string_count = i = 0; | |
520 | list[i] != NULL; | |
521 | ++i, ++string_count) | |
522 | { | |
523 | int length = strlen(list[i]); | |
524 | ||
525 | if (length > max_length) | |
526 | max_length = length; | |
527 | } | |
528 | ||
529 | /* if we have no strings, then something is wrong. */ | |
530 | if (string_count == 0) | |
531 | return(-1); | |
532 | ||
533 | /* otherwise, we will need a holding area big enough to hold almost two | |
534 | copies of our largest string. */ | |
535 | swallowed_p = swallowed = alloca(max_length << 1); | |
536 | ||
537 | /* and a list of pointers to current scan points. */ | |
55fea07b | 538 | plist = (char **) alloca (string_count * sizeof(*plist)); |
c6f494e8 RP |
539 | |
540 | /* and initialize */ | |
541 | for (i = 0; i < string_count; ++i) | |
542 | plist[i] = list[i]; | |
543 | ||
544 | for (ch = sr_readchar(); /* loop forever */ ; ch = sr_readchar()) | |
545 | { | |
546 | QUIT; /* Let user quit and leave process running */ | |
547 | ch_handled = 0; | |
548 | ||
549 | for (i = 0; i < string_count; ++i) | |
550 | { | |
551 | if (ch == *plist[i] || *plist[i] == '?') | |
552 | { | |
553 | ++plist[i]; | |
554 | if (*plist[i] == '\0') | |
555 | return(i); | |
556 | ||
557 | if (!ch_handled) | |
558 | *swallowed_p++ = ch; | |
559 | ||
560 | ch_handled = 1; | |
561 | } | |
562 | else | |
563 | plist[i] = list[i]; | |
564 | } | |
565 | ||
566 | if (!ch_handled) | |
567 | { | |
568 | char *p; | |
569 | ||
570 | /* Print out any characters which have been swallowed. */ | |
571 | if (passthrough) | |
572 | { | |
573 | for (p = swallowed; p < swallowed_p; ++p) | |
ee9feb65 | 574 | fputc_unfiltered (*p, gdb_stdout); |
c6f494e8 | 575 | |
ee9feb65 | 576 | fputc_unfiltered (ch, gdb_stdout); |
c6f494e8 RP |
577 | } |
578 | ||
579 | swallowed_p = swallowed; | |
580 | } | |
581 | } | |
55fea07b JK |
582 | #if 0 |
583 | /* Never reached. */ | |
c6f494e8 | 584 | return(-1); |
55fea07b | 585 | #endif |
c6f494e8 RP |
586 | } |
587 | ||
588 | /* Get ready to modify the registers array. On machines which store | |
589 | individual registers, this doesn't need to do anything. On machines | |
590 | which store all the registers in one fell swoop, this makes sure | |
591 | that registers contains all the registers from the program being | |
592 | debugged. */ | |
593 | ||
594 | void | |
595 | gr_prepare_to_store () | |
596 | { | |
597 | /* Do nothing, since we assume we can store individual regs */ | |
598 | } | |
599 | ||
600 | /* Read a word from remote address ADDR and return it. | |
601 | * This goes through the data cache. | |
602 | */ | |
603 | int | |
604 | gr_fetch_word (addr) | |
605 | CORE_ADDR addr; | |
606 | { | |
607 | return dcache_fetch (gr_get_dcache(), addr); | |
608 | } | |
609 | ||
610 | /* Write a word WORD into remote address ADDR. | |
611 | This goes through the data cache. */ | |
612 | ||
613 | void | |
614 | gr_store_word (addr, word) | |
615 | CORE_ADDR addr; | |
616 | int word; | |
617 | { | |
618 | dcache_poke (gr_get_dcache(), addr, word); | |
619 | } | |
620 | ||
bf2429ab SC |
621 | /* general purpose load a file specified on the command line |
622 | into target memory. */ | |
623 | ||
624 | void | |
625 | gr_load_image (args, fromtty) | |
626 | char *args; | |
627 | int fromtty; | |
628 | { | |
629 | bfd *abfd; | |
630 | ||
631 | asection *s; | |
632 | struct cleanup *old_cleanups; | |
633 | int delta = 4096; | |
634 | char *buffer = xmalloc (delta); | |
635 | ||
636 | abfd = bfd_openr (args, (char *) 0); | |
637 | ||
638 | if (!abfd) | |
639 | perror_with_name (args); | |
640 | ||
641 | old_cleanups = make_cleanup (bfd_close, abfd); | |
642 | ||
643 | QUIT; | |
bf2429ab SC |
644 | |
645 | if (!bfd_check_format (abfd, bfd_object)) | |
646 | error ("It doesn't seem to be an object file.\n"); | |
647 | ||
08c0d7b8 | 648 | for (s = abfd->sections; s && !quit_flag; s = s->next) |
bf2429ab SC |
649 | { |
650 | if (bfd_get_section_flags (abfd, s) & SEC_LOAD) | |
651 | { | |
652 | int i; | |
653 | printf_filtered ("%s\t: 0x%4x .. 0x%4x ", | |
654 | s->name, s->vma, s->vma + s->_raw_size); | |
08c0d7b8 SC |
655 | fflush (stdout); |
656 | for (i = 0; i < s->_raw_size && !quit_flag; i += delta) | |
bf2429ab SC |
657 | { |
658 | int sub_delta = delta; | |
659 | if (sub_delta > s->_raw_size - i) | |
660 | sub_delta = s->_raw_size - i; | |
08c0d7b8 | 661 | QUIT; |
bf2429ab SC |
662 | bfd_get_section_contents (abfd, s, buffer, i, sub_delta); |
663 | target_write_memory (s->vma + i, buffer, sub_delta); | |
664 | printf_filtered ("*"); | |
665 | fflush (stdout); | |
666 | } | |
667 | printf_filtered ("\n"); | |
668 | } | |
669 | } | |
08c0d7b8 | 670 | |
bf2429ab SC |
671 | free (buffer); |
672 | write_pc (bfd_get_start_address (abfd)); | |
673 | bfd_close (abfd); | |
674 | discard_cleanups (old_cleanups); | |
675 | } | |
676 | ||
677 | ||
c6f494e8 RP |
678 | void |
679 | _initialize_sr_support () | |
680 | { | |
c6f494e8 RP |
681 | /* FIXME-now: if target is open... */ |
682 | add_show_from_set (add_set_cmd ("remotedevice", no_class, | |
683 | var_filename, (char *)&sr_settings.device, | |
684 | "Set device for remote serial I/O.\n\ | |
685 | This device is used as the serial port when debugging using remote\n\ | |
686 | targets.", &setlist), | |
687 | &showlist); | |
688 | ||
689 | add_com ("remote <command>", class_obscure, sr_com, | |
690 | "Send a command to the remote monitor."); | |
691 | ||
692 | } |