]>
Commit | Line | Data |
---|---|---|
5580185e | 1 | /* |
097e9b93 | 2 | * $Source$ |
3 | * $Header$ | |
5580185e | 4 | */ |
5 | ||
6 | #ifndef lint | |
7 | static char *rcsid_gdb_ops_c = "$Header$"; | |
8 | #endif lint | |
9 | ||
10 | ||
097e9b93 | 11 | /************************************************************************ |
12 | * | |
13 | * gdb_ops.c | |
14 | * | |
15 | * GDB - Asynchronous Operations and Their Synchronous | |
16 | * Counterparts | |
17 | * | |
18 | * Author: Noah Mendelsohn | |
19 | * Copyright: 1986 MIT Project Athena | |
20 | * For copying and distribution information, please see | |
21 | * the file <mit-copyright.h>. | |
22 | * | |
23 | * These routines provide a suite of asynchronous operations | |
24 | * on connections. | |
25 | * | |
26 | ************************************************************************/ | |
5580185e | 27 | |
0a5ff702 | 28 | #include <mit-copyright.h> |
5580185e | 29 | #include <stdio.h> |
30 | #include "gdb.h" | |
31 | #include <netinet/in.h> | |
32 | #include <sys/ioctl.h> | |
097e9b93 | 33 | #ifdef SOLARIS |
34 | #include <sys/filio.h> | |
35 | #endif | |
5580185e | 36 | #ifdef vax |
37 | extern u_long htonl(); | |
38 | #endif vax | |
097e9b93 | 39 | |
40 | ||
41 | /************************************************************************ | |
42 | * | |
43 | * send_object (send_object) | |
44 | * | |
45 | * Synchronous form of start_sending_object. Returns either | |
46 | * OP_CANCELLED, or OP_RESULT(op). | |
47 | * | |
48 | ************************************************************************/ | |
5580185e | 49 | |
50 | int | |
51 | send_object(con, objp, type) | |
52 | CONNECTION con; | |
53 | char *objp; | |
54 | int type; | |
55 | { | |
56 | register OPERATION op; | |
57 | register int retval; | |
58 | ||
59 | ||
60 | op = create_operation(); | |
61 | start_sending_object(op, con, objp, type); | |
62 | (void) complete_operation(op); | |
63 | if (OP_STATUS(op) == OP_COMPLETE) | |
64 | retval = OP_RESULT(op); | |
65 | else | |
66 | retval = OP_STATUS(op); | |
67 | delete_operation(op); | |
68 | return retval; | |
69 | } | |
097e9b93 | 70 | |
71 | ||
5580185e | 72 | /************************************************************************/ |
73 | /* | |
74 | /* start_send_object (g_snobj) | |
75 | /* | |
76 | /* Start the asynchronous transmission of a gdb object. | |
77 | /* Note that this routine must be passed the address of the object, | |
78 | /* not the object itself. | |
79 | /* | |
80 | /* The following three routines work together, and may be considered | |
81 | /* as a single entity implementing the operation. The first merely | |
82 | /* saves away its arguments and queues the operation on the designated | |
83 | /* connection. These stay there until they percolate to the head of | |
84 | /* the queue. The second is the initialization routine, which is | |
85 | /* called by the connection maintenance logic when the operation | |
86 | /* first reaches the head of the queue. This routine encodes | |
87 | /* the supplied data for transmission, and then sends it. If the | |
88 | /* transmission executes synchronously, then the third routine is | |
89 | /* called immediately to clean up. If not, the third routine is | |
90 | /* marked as the 'continuation' routine, which will cause its | |
91 | /* invocation when the transmission completes. | |
92 | /* | |
93 | /* The data is preceded by its length expressed as a long in | |
94 | /* network byte order. | |
95 | /* | |
96 | /************************************************************************/ | |
97 | ||
98 | struct obj_data { | |
99 | char *objp; /* address of the object to */ | |
100 | /* be sent */ | |
101 | int type; /* type code for the object */ | |
102 | /* to be sent*/ | |
103 | char *flattened; /* address of first byte */ | |
104 | /* of flattened data */ | |
105 | int len; /* length of the flattened */ | |
106 | /* data */ | |
107 | }; | |
108 | ||
109 | int g_isnobj(); | |
110 | int g_csnobj(); | |
111 | ||
112 | int | |
113 | start_sending_object(op, con, objp, type) | |
114 | OPERATION op; | |
115 | CONNECTION con; | |
116 | char *objp; | |
117 | int type; | |
118 | { | |
119 | struct obj_data *arg; | |
120 | ||
121 | /* | |
122 | * Make sure the supplied connection is a legal one | |
123 | */ | |
124 | GDB_CHECK_CON(con, "start_sending_object") | |
125 | GDB_CHECK_OP(op, "start_sending_object") | |
126 | ||
127 | arg = (struct obj_data *)db_alloc(sizeof(struct obj_data)); | |
128 | ||
129 | arg->objp = objp; | |
130 | arg->type = type; | |
131 | initialize_operation(op, g_isnobj, (char *)arg, (int (*)())NULL); | |
132 | (void) queue_operation(con, CON_OUTPUT, op); | |
133 | } | |
134 | ||
135 | /*----------------------------------------------------------*/ | |
136 | /* | |
137 | /* g_isnobj | |
138 | /* | |
139 | /* Init routine for sending an object. This routine is | |
140 | /* called by the connection management logic when the send | |
141 | /* request percolates to the top of the queue. This routine | |
142 | /* reformats the data into an appropriate form for transmission. | |
143 | /* The format used is a length, represented as a long in | |
144 | /* network byte order, followed by the data itself. The | |
145 | /* continuation routine below is called, either synchronously | |
146 | /* or asynchronously, once the transmission is complete. | |
147 | /* | |
148 | /*----------------------------------------------------------*/ | |
149 | ||
150 | int | |
151 | g_isnobj(op, hcon, arg) | |
152 | OPERATION op; | |
153 | HALF_CONNECTION hcon; | |
154 | struct obj_data *arg; | |
155 | { | |
156 | /* | |
157 | * Find out the encoded length of the data | |
158 | */ | |
159 | arg->len = FCN_PROPERTY(arg->type, CODED_LENGTH_PROPERTY) | |
160 | (arg->objp, hcon); | |
161 | ||
162 | /* | |
163 | * Allocate space and flatten (encode) the data | |
164 | */ | |
165 | arg->flattened = db_alloc(arg->len+sizeof(long)); | |
166 | *(u_long *)arg->flattened = htonl((u_long)arg->len); | |
167 | ||
168 | FCN_PROPERTY(arg->type, ENCODE_PROPERTY) | |
169 | (arg->objp, hcon, arg->flattened+sizeof(long)); | |
170 | ||
171 | /* | |
172 | * Set up continuation routine in case it's needed after the return | |
173 | */ | |
174 | op->fcn.cont = g_csnobj; | |
175 | ||
176 | /* | |
177 | * Start sending the data, maybe even complete | |
178 | */ | |
179 | if (gdb_send_data(hcon, arg->flattened, arg->len + sizeof(long)) == | |
180 | OP_COMPLETE) { | |
181 | return g_csnobj(op, hcon, arg) ;/* this return is a little */ | |
182 | /* subtle. As continuation */ | |
183 | /* routines call each other */ | |
184 | /* synchronously, the last */ | |
185 | /* one determines whether we */ | |
186 | /* completed or are still */ | |
187 | /* running. That status */ | |
188 | /* percolates back through */ | |
189 | /* the entire call chain. */ | |
190 | } else { | |
191 | return OP_RUNNING; | |
192 | } | |
193 | } | |
194 | ||
195 | ||
196 | ||
197 | ||
198 | ||
199 | ||
200 | /*----------------------------------------------------------*/ | |
201 | /* | |
202 | /* g_csnobj | |
203 | /* | |
204 | /* Continuation routine for sending an object. Since there is | |
205 | /* only one transmission, started by the init routine, this is | |
206 | /* called when that transmission is done, and it does all the | |
207 | /* associated clean up. | |
208 | /* | |
209 | /*----------------------------------------------------------*/ | |
210 | ||
24582af9 | 211 | /*ARGSUSED*/ |
5580185e | 212 | int |
213 | g_csnobj(op, hcon, arg) | |
214 | OPERATION op; | |
215 | HALF_CONNECTION hcon; | |
216 | struct obj_data *arg; | |
217 | { | |
218 | op->result = OP_SUCCESS; | |
219 | db_free((char *)arg->flattened, arg->len + sizeof(long)); | |
220 | /* free the sent data */ | |
221 | db_free((char *)arg, sizeof(struct obj_data)); /* free the state structure */ | |
222 | return OP_COMPLETE; | |
223 | } | |
224 | ||
097e9b93 | 225 | |
5580185e | 226 | /************************************************************************/ |
227 | /* | |
228 | /* receive_object (receive_object) | |
229 | /* | |
230 | /* Synchronous form of start_receiving_object. Returns either | |
231 | /* OP_CANCELLED, or OP_RESULT(op). | |
232 | /* | |
233 | /************************************************************************/ | |
234 | ||
235 | int | |
236 | receive_object(con, objp, type) | |
237 | CONNECTION con; | |
238 | char *objp; | |
239 | int type; | |
240 | { | |
241 | register OPERATION op; | |
242 | register int retval; | |
243 | ||
244 | op = create_operation(); | |
245 | start_receiving_object(op, con, objp, type); | |
246 | (void) complete_operation(op); | |
247 | if (OP_STATUS(op) == OP_COMPLETE) | |
248 | retval = OP_RESULT(op); | |
249 | else | |
250 | retval = OP_STATUS(op); | |
251 | delete_operation(op); | |
252 | return retval; | |
253 | } | |
097e9b93 | 254 | |
255 | ||
5580185e | 256 | /************************************************************************/ |
257 | /* | |
258 | /* start_receiving_object (g_rcobj) | |
259 | /* | |
260 | /* Start the asynchronous receipt of a gdb object. Note that this | |
261 | /* routine must be passed the address of the object, not the object | |
262 | /* itself. In the case of structured objects, this routine may | |
263 | /* allocate the necessary storage. The work to build the object is | |
264 | /* done by the object's decode routine. | |
265 | /* | |
266 | /* The following three routines work together, and may be considered | |
267 | /* as a single entity implementing the operation. The first merely | |
268 | /* saves away its arguments and queues the operation on the designated | |
269 | /* connection. These stay there until they percolate to the head of | |
270 | /* the queue. The second is the initialization routine, which is | |
271 | /* called by the connection maintenance logic when the operation | |
272 | /* first reaches the head of the queue. This routine initiates a read | |
273 | /* for the length of the object, and sets up a continuation routine | |
274 | /* to read the object itself. When the object itself has been read, it | |
275 | /* is decoded and the operation completes. | |
276 | /* | |
277 | /* The data is preceded by its length expressed as a long in | |
278 | /* network byte order. | |
279 | /* | |
280 | /* preempt_and_start_receiving_object (g_prcobj) | |
281 | /* | |
282 | /* Similar to above, but may be called only from an active operation | |
283 | /* (i.e. an init or continue routine) on an inbound half connection. | |
284 | /* The receive effectively pre-empts the old operation, which wil | |
285 | /* continue after the receive is done. | |
286 | /* | |
287 | /* | |
288 | /************************************************************************/ | |
289 | ||
290 | struct robj_data { | |
291 | char *objp; /* address of the object to */ | |
292 | /* be received */ | |
293 | int type; /* type code for the object */ | |
294 | /* to be received */ | |
295 | char *flattened; /* address of first byte */ | |
296 | /* of flattened data */ | |
297 | int len; /* length of the flattened */ | |
298 | /* data */ | |
299 | }; | |
300 | ||
301 | int g_ircobj(); | |
302 | int g_c1rcobj(); | |
303 | int g_c2rcobj(); | |
304 | ||
305 | /*----------------------------------------------------------*/ | |
306 | /* | |
307 | /* start_receiving_object | |
308 | /* | |
309 | /*----------------------------------------------------------*/ | |
310 | ||
311 | int | |
312 | start_receiving_object(op, con, objp, type) | |
313 | OPERATION op; | |
314 | CONNECTION con; | |
315 | char *objp; | |
316 | int type; | |
317 | { | |
318 | struct robj_data *arg; | |
319 | ||
320 | /* | |
321 | * Make sure the supplied connection is a legal one | |
322 | */ | |
323 | GDB_CHECK_CON(con, "start_receiving_object") | |
324 | GDB_CHECK_OP(op, "start_receiving_object") | |
325 | ||
326 | arg = (struct robj_data *)db_alloc(sizeof(struct robj_data)); | |
327 | ||
328 | arg->objp = objp; | |
329 | arg->type = type; | |
330 | initialize_operation(op, g_ircobj, (char *)arg, (int (*)())NULL); | |
331 | (void) queue_operation(con, CON_INPUT, op); | |
332 | } | |
333 | ||
334 | /*----------------------------------------------------------*/ | |
335 | /* | |
336 | /* preempt_and_start_receiving_object | |
337 | /* | |
338 | /*----------------------------------------------------------*/ | |
339 | ||
340 | int | |
341 | preempt_and_start_receiving_object(op, oldop, objp, type) | |
342 | OPERATION op; | |
343 | OPERATION oldop; | |
344 | char *objp; | |
345 | int type; | |
346 | { | |
347 | struct robj_data *arg; | |
348 | ||
349 | /* | |
350 | * Make sure the supplied connection is a legal one | |
351 | */ | |
352 | GDB_CHECK_OP(op, "preempt_and_start_receiving_object") | |
353 | GDB_CHECK_OP(oldop, "preempt_and_start_receiving_object") | |
354 | ||
355 | arg = (struct robj_data *)db_alloc(sizeof(struct robj_data)); | |
356 | ||
357 | arg->objp = objp; | |
358 | arg->type = type; | |
359 | initialize_operation(op, g_ircobj, (char *)arg, (int (*)())NULL); | |
360 | (void) g_preempt_me(oldop, op); | |
361 | } | |
362 | ||
363 | /*----------------------------------------------------------*/ | |
364 | /* | |
365 | /* g_ircobj | |
366 | /* | |
367 | /* Initialization routine for receiving an object. | |
368 | /* Called when the receive operation percolates to the | |
369 | /* top of the queue. First, we must receive the single | |
370 | /* 'long' which carries the length of the rest of the data. | |
371 | /* We do that now, either synchronously or asynchronously. | |
372 | /* | |
373 | /*----------------------------------------------------------*/ | |
374 | ||
375 | int | |
376 | g_ircobj(op, hcon, arg) | |
377 | OPERATION op; | |
378 | HALF_CONNECTION hcon; | |
379 | struct robj_data *arg; | |
380 | { | |
381 | op->fcn.cont = g_c1rcobj; | |
382 | if(gdb_receive_data(hcon, (char *)&(arg->len), sizeof(long)) == OP_COMPLETE) { | |
383 | return g_c1rcobj(op, hcon, arg);/* this return is a little */ | |
384 | /* subtle. As continuation */ | |
385 | /* routines call each other */ | |
386 | /* synchronously, the last */ | |
387 | /* one determines whether we */ | |
388 | /* completed or are still */ | |
389 | /* running. That status */ | |
390 | /* percolates back through */ | |
391 | /* the entire call chain. */ | |
392 | } else { | |
393 | return OP_RUNNING; | |
394 | } | |
395 | } | |
396 | ||
397 | /*----------------------------------------------------------*/ | |
398 | /* | |
399 | /* g_c1rcobj | |
400 | /* | |
401 | /* At this point, we have received the length. Now, allocate | |
402 | /* the space for the rest of the data, and start receiving | |
403 | /* it. | |
404 | /* | |
405 | /*----------------------------------------------------------*/ | |
406 | ||
407 | int | |
408 | g_c1rcobj(op, hcon, arg) | |
409 | OPERATION op; | |
410 | HALF_CONNECTION hcon; | |
411 | struct robj_data *arg; | |
412 | { | |
413 | #ifdef vax | |
414 | extern u_long ntohl(); | |
415 | #endif vax | |
416 | ||
417 | /* | |
418 | * Now we know the length of the encoded data, convert the length | |
419 | * to local byte order, and allocate the space for the receive. | |
420 | */ | |
421 | arg->len = (int) ntohl((u_long)arg->len); | |
b1fb7b0c | 422 | if (arg->len > 65536) |
423 | return OP_CANCELLED; | |
5580185e | 424 | |
425 | arg->flattened = db_alloc(arg->len); | |
b1fb7b0c | 426 | if (arg->flattened == NULL) |
427 | return OP_CANCELLED; | |
5580185e | 428 | /* |
429 | * Now start receiving the encoded object itself. If it all comes in | |
430 | * synchronously, then just go on to the c2 routine to decode it and | |
431 | * finish up. Else return OP_RUNNING, so the rest of the system | |
432 | * can get some work done while we wait. | |
433 | */ | |
434 | op->fcn.cont = g_c2rcobj; | |
435 | if(gdb_receive_data(hcon, arg->flattened, arg->len ) == OP_COMPLETE) { | |
436 | return g_c2rcobj(op, hcon, arg); | |
437 | } else { | |
438 | return OP_RUNNING; | |
439 | } | |
440 | } | |
441 | ||
442 | /*----------------------------------------------------------*/ | |
443 | /* | |
444 | /* g_c2rcobj | |
445 | /* | |
446 | /* At this point, all the data has been received. Decode | |
447 | /* it into the place provided by the caller, free all | |
448 | /* temporarily allocated memory, and return. | |
449 | /* | |
450 | /*----------------------------------------------------------*/ | |
451 | ||
452 | int | |
453 | g_c2rcobj(op, hcon, arg) | |
454 | OPERATION op; | |
455 | HALF_CONNECTION hcon; | |
456 | struct robj_data *arg; | |
457 | { | |
458 | /* | |
459 | * Decode the received data into local representation. | |
460 | */ | |
461 | FCN_PROPERTY(arg->type, DECODE_PROPERTY) | |
462 | (arg->objp, hcon, arg->flattened); | |
463 | op->result = OP_SUCCESS; | |
464 | db_free(arg->flattened, arg->len); /* free the received data */ | |
465 | db_free((char *)arg, sizeof(struct robj_data)); /* free the state structure */ | |
466 | return OP_COMPLETE; | |
467 | } | |
097e9b93 | 468 | |
469 | ||
5580185e | 470 | /************************************************************************/ |
471 | /* | |
472 | /* complete_operation(complete_operation) | |
473 | /* | |
474 | /* Wait for a given operation to complete, allowing everything | |
475 | /* to progress in the meantime. Returns the last known status | |
476 | /* of the operation, which in general will be OP_COMPLETE unless | |
477 | /* errors were encountered (and this version of the code doesn't | |
478 | /* do error handing right anyway!) | |
479 | /* | |
480 | /* We do this by (1) calling gdb_progress to assure that all | |
481 | /* possible progress has been made, which is always a good thing | |
482 | /* to do when we get the chance and (2) looping on calls to | |
483 | /* con_select, which will make all possible future progress, | |
484 | /* but without burning cycles unnecessarily in the process. | |
485 | /* | |
486 | /************************************************************************/ | |
487 | ||
488 | int | |
489 | complete_operation(op) | |
490 | OPERATION op; | |
491 | { | |
492 | (void) gdb_progress(); | |
493 | ||
494 | while(op->status != OP_COMPLETE && op->status != OP_CANCELLED) | |
495 | (void) con_select(0, (fd_set *)NULL, (fd_set *)NULL, | |
496 | (fd_set *)NULL, (struct timeval *)NULL); | |
497 | ||
498 | return op->status; | |
499 | ||
500 | } | |
501 | ||
097e9b93 | 502 | |
5580185e | 503 | /************************************************************************/ |
504 | /* | |
505 | /* cancel_operation(cancel_operation) | |
506 | /* | |
507 | /* Attempts to cancel an operation. | |
508 | /* | |
509 | /************************************************************************/ | |
510 | ||
511 | int | |
512 | cancel_operation(op) | |
513 | OPERATION op; | |
514 | { | |
515 | register HALF_CONNECTION hcon = op->halfcon; | |
516 | ||
517 | if (op->status != OP_RUNNING && op->status != OP_QUEUED) | |
518 | return op->status; | |
519 | ||
520 | if (hcon == NULL) | |
521 | GDB_GIVEUP("cancel_operation: operation is queued but half connection is unknown") | |
522 | ||
523 | /* | |
524 | * If we're at the head of the queue and running, then we have to | |
525 | * call the cancelation routine for this particular operation so | |
526 | * it can clean up. | |
527 | */ | |
528 | if (op->prev == (OPERATION)hcon) { | |
529 | if (op->status == OP_RUNNING && op->cancel != NULL) | |
530 | (*op->cancel)(op->halfcon, op->arg); | |
531 | } | |
532 | ||
533 | /* | |
534 | * Looks safe, now cancel it. | |
535 | */ | |
536 | op->next->prev = op->prev; /* de-q it */ | |
537 | op->prev->next = op->next; /* " " " */ | |
538 | op->status = OP_CANCELLED; | |
539 | op->halfcon = NULL; | |
540 | ||
541 | return OP_CANCELLED; | |
542 | } | |
097e9b93 | 543 | |
544 | ||
5580185e | 545 | /************************************************************************/ |
546 | /* | |
547 | /* start_listening | |
548 | /* | |
549 | /* Start the asynchronous acquisition of a connection. This | |
550 | /* results in the queuing of a GDB "OPERATION" to do the | |
551 | /* requested listening. | |
552 | /* | |
553 | /************************************************************************/ | |
554 | ||
555 | struct lis_data { | |
556 | char *otherside; /* data returned from an */ | |
557 | /* accept */ | |
558 | int *otherlen; /* length of the otherside */ | |
559 | /* field */ | |
560 | int *fdp; /* ptr to the fd of the */ | |
561 | /* newly accepted */ | |
562 | /* connection */ | |
563 | }; | |
564 | ||
565 | int g_ilis(); | |
566 | int g_clis(); | |
567 | ||
b1fb7b0c | 568 | void |
5580185e | 569 | gdb_start_listening(op, con, otherside, lenp, fdp) |
570 | OPERATION op; | |
571 | CONNECTION con; | |
572 | char *otherside; | |
573 | int *lenp; | |
574 | int *fdp; | |
575 | { | |
576 | struct lis_data *arg; | |
577 | ||
578 | GDB_INIT_CHECK | |
579 | ||
580 | /* | |
581 | * Make sure the supplied connection is a legal one | |
582 | */ | |
583 | GDB_CHECK_CON(con, "start_listening") | |
584 | GDB_CHECK_OP(op, "start_listening") | |
585 | ||
586 | arg = (struct lis_data *)db_alloc(sizeof(struct lis_data)); | |
587 | ||
588 | arg->otherside = otherside; | |
589 | arg->otherlen = lenp; | |
590 | arg->fdp = fdp; | |
591 | initialize_operation(op, g_ilis, (char *)arg, (int (*)())NULL); | |
592 | (void) queue_operation(con, CON_INPUT, op); | |
593 | } | |
594 | ||
595 | /*----------------------------------------------------------*/ | |
596 | /* | |
597 | /* g_ilis | |
598 | /* | |
599 | /* Init routine for doing a listen. | |
600 | /* | |
601 | /*----------------------------------------------------------*/ | |
602 | ||
603 | int | |
604 | g_ilis(op, hcon, arg) | |
605 | OPERATION op; | |
606 | HALF_CONNECTION hcon; | |
607 | struct lis_data *arg; | |
608 | { | |
609 | int rc; | |
610 | ||
611 | /* | |
612 | * Set up continuation routine in case it's needed after the return | |
613 | */ | |
614 | op->fcn.cont = g_clis; | |
615 | ||
616 | /* | |
617 | * Try doing the listen now, and then decide whether to go | |
618 | * right on to the continuation routine or to let things hang | |
619 | * for the moment. | |
620 | */ | |
621 | rc = gdb_start_a_listen(hcon, arg->otherside, arg->otherlen, arg->fdp); | |
622 | if (rc==OP_COMPLETE) { | |
623 | return g_clis(op, hcon, arg); /* this return is a little */ | |
624 | /* subtle. As continuation */ | |
625 | /* routines call each other */ | |
626 | /* synchronously, the last */ | |
627 | /* one determines whether we */ | |
628 | /* completed or are still */ | |
629 | /* running. That status */ | |
630 | /* percolates back through */ | |
631 | /* the entire call chain. */ | |
632 | } else { | |
633 | return OP_RUNNING; | |
634 | } | |
635 | } | |
636 | ||
637 | ||
638 | ||
639 | /*----------------------------------------------------------*/ | |
640 | /* | |
641 | /* g_clis | |
642 | /* | |
643 | /* Continuation routine for accepting a connection. | |
644 | /* | |
645 | /* At this point, the fd has been accepted and all | |
646 | /* the necessary information given back to the caller. | |
647 | /* | |
648 | /*----------------------------------------------------------*/ | |
649 | ||
24582af9 | 650 | /*ARGSUSED*/ |
5580185e | 651 | int |
652 | g_clis(op, hcon, arg) | |
653 | OPERATION op; | |
654 | HALF_CONNECTION hcon; | |
655 | struct lis_data *arg; | |
656 | { | |
657 | op->result = OP_SUCCESS; | |
658 | db_free((char *)arg, sizeof(struct lis_data)); | |
659 | /* free the state structure */ | |
660 | return OP_COMPLETE; | |
661 | } | |
662 | ||
097e9b93 | 663 | |
5580185e | 664 | /************************************************************************/ |
665 | /* | |
666 | /* start_accepting_client | |
667 | /* | |
668 | /* Start the asynchronous acquisition of a client. This queueable | |
669 | /* operation first tries to accept a connection. On this connection, | |
670 | /* it reads a startup string from the client, and then completes. | |
671 | /* | |
672 | /* The return values from this are not quite what you might expect. | |
673 | /* In general, the operation will show complete, rather than cancelled, | |
674 | /* if it gets as far as creating the new connection at all. If | |
675 | /* subsequent activities result in errors from system calls, then | |
676 | /* this operation will complete with a status of OP_COMPLETE and a | |
677 | /* result of OP_CANCELLED. In this case, the applications IS given | |
678 | /* a connection descriptor for the new connection, and that descriptor | |
679 | /* has an errno value indicating why the failure occurred. The | |
680 | /* caller must then sever this connection to free the descriptor. | |
681 | /* | |
682 | /************************************************************************/ | |
683 | ||
684 | struct acc_data { | |
685 | char *otherside; /* data returned from an */ | |
686 | /* accept */ | |
687 | int *otherlen; /* length of the otherside */ | |
688 | /* field */ | |
689 | OPERATION listenop; /* used to listen for */ | |
690 | /* the fd */ | |
691 | OPERATION receiveop; /* used when receiving */ | |
692 | /* tuple from the client */ | |
693 | CONNECTION con; /* the connection we're */ | |
694 | /* trying to create */ | |
695 | CONNECTION *conp; /* this is where the caller */ | |
696 | /* wants the connection */ | |
697 | /* returned */ | |
698 | TUPLE *tuplep; /* pointer to tuple we */ | |
699 | /* are going to receive */ | |
700 | /* from new client */ | |
701 | }; | |
702 | ||
703 | int g_iacc(); | |
704 | int g_i2acc(); | |
705 | ||
b1fb7b0c | 706 | void |
5580185e | 707 | start_accepting_client(listencon, op, conp, otherside, lenp, tuplep) |
708 | CONNECTION listencon; | |
709 | OPERATION op; | |
710 | CONNECTION *conp; | |
711 | char *otherside; | |
712 | int *lenp; | |
713 | TUPLE *tuplep; | |
714 | { | |
715 | struct acc_data *arg; | |
716 | ||
717 | GDB_INIT_CHECK | |
718 | ||
719 | /* | |
720 | * Make sure the supplied connection and operation are legal | |
721 | */ | |
722 | GDB_CHECK_CON(listencon, "start_accepting_client") | |
723 | GDB_CHECK_OP(op, "start_accepting_client") | |
724 | ||
725 | arg = (struct acc_data *)db_alloc(sizeof(struct acc_data)); | |
726 | ||
727 | arg->otherside = otherside; | |
728 | arg->otherlen = lenp; | |
729 | arg->conp = conp; | |
730 | *conp = NULL; /* in case we fail */ | |
731 | arg->listenop = create_operation(); | |
732 | arg->receiveop = create_operation(); | |
733 | arg->con = g_make_con(); | |
734 | arg->tuplep = tuplep; | |
735 | *tuplep = NULL; /* in case we fail */ | |
736 | ||
737 | /* | |
738 | * Queue an operation ahead of us which will accept an fd and | |
739 | * put it in arg->con->in. As a byproduct, pick up the from | |
740 | * information that we return to the caller. | |
741 | */ | |
742 | gdb_start_listening(arg->listenop, listencon, | |
743 | arg->otherside, | |
744 | arg->otherlen, &(arg->con->in.fd)); | |
745 | ||
746 | /* | |
747 | * Now queue us behind it. By the time we run our init routine, | |
748 | * a connection should have been acquired. | |
749 | */ | |
750 | initialize_operation(op, g_iacc, (char *)arg, (int (*)())NULL); | |
751 | (void) queue_operation(listencon, CON_INPUT, op); | |
752 | } | |
753 | ||
754 | /*----------------------------------------------------------*/ | |
755 | /* | |
756 | /* g_iacc | |
757 | /* | |
758 | /* Init routine for accepting a connection. By the | |
759 | /* time this runs, the listen has been done, the | |
760 | /* 'from' data put in position for the caller, and | |
761 | /* the fd plugged into the connection descriptor. | |
762 | /* If all went well, fill out the connection descriptor | |
763 | /* and then requeue us on that to do the receive of | |
764 | /* the requested tuple. | |
765 | /* | |
766 | /*----------------------------------------------------------*/ | |
767 | ||
24582af9 | 768 | /*ARGSUSED*/ |
5580185e | 769 | int |
770 | g_iacc(op, hcon, arg) | |
771 | OPERATION op; | |
772 | HALF_CONNECTION hcon; | |
773 | struct acc_data *arg; | |
774 | { | |
775 | register CONNECTION con = arg->con; | |
776 | ||
777 | /* | |
778 | * Set up 2nd init routine for after we re-queue ourselves | |
779 | */ | |
780 | op->fcn.cont = g_i2acc; | |
781 | /* | |
782 | * See whether we successfully accepted a connection. If | |
783 | * not, we just cancel ourselves. If so, fill out the | |
784 | * connection descriptor and related data structures properly, | |
785 | * then requeue ourselves on the new connection. | |
786 | */ | |
787 | if (OP_STATUS(arg->listenop) != OP_COMPLETE || | |
788 | OP_RESULT(arg->listenop) != OP_SUCCESS || | |
789 | con->in.fd <=0) { | |
790 | (void) sever_connection(con); | |
791 | g_clnup_accept(arg); | |
792 | op->result = OP_CANCELLED; | |
793 | return OP_CANCELLED; | |
794 | } | |
795 | ||
796 | /* | |
797 | * OK, we got an fd, but the connection and related structures | |
798 | * aren't really set up straight, and the fd must be put | |
799 | * into non-blocking mode. There really should be a common | |
800 | * routine for this, since some of the logic exists in 2 | |
801 | * or 3 places. | |
802 | */ | |
803 | con->status = CON_STARTING; | |
804 | con->out.fd = con->in.fd; | |
805 | g_ver_iprotocol(con); /* make sure we're at */ | |
806 | /* same level of protocol */ | |
807 | if (con->status == CON_UP) { | |
808 | /* | |
809 | * We've successfully started the connection, now mark | |
810 | * it for non-blocking I/O. Also, update the high water | |
811 | * mark of fd's controlled by our system. | |
812 | */ | |
813 | int nb = 1; | |
814 | if(ioctl(con->in.fd, FIONBIO, (char *)&nb)== (-1)) { | |
815 | g_stop_with_errno(con); | |
816 | *arg->conp = con; /* give failed con to */ | |
817 | /* caller so he can find */ | |
818 | /* errno */ | |
819 | gdb_perror("gdb: ioctl for non-block failed"); | |
820 | g_clnup_accept(arg); | |
821 | op->result = OP_CANCELLED; /* we didn't really, but */ | |
822 | /* we want caller to look */ | |
823 | /* at the connection so he */ | |
824 | /* can find errno*/ | |
825 | return OP_COMPLETE; | |
826 | } | |
827 | if (con->in.fd +1 > gdb_mfd) | |
828 | gdb_mfd = con->in.fd + 1; | |
829 | /* | |
830 | * Allocate a buffer, if necessary, and reset buffer pointers | |
831 | * so first request will result in a long read into the buffer | |
832 | */ | |
833 | g_allocate_connection_buffers(con); | |
834 | ||
835 | } else { | |
836 | *arg->conp = con; /* give failed con to */ | |
837 | /* caller so he can find */ | |
838 | /* errno */ | |
839 | g_clnup_accept(arg); | |
840 | op->result = OP_CANCELLED; | |
841 | return OP_COMPLETE; | |
842 | } | |
843 | ||
844 | /* | |
845 | * Before we requeue ourselves on the new connection, queue | |
846 | * up a receive for the expected tuple. Then we'll be | |
847 | * sure that it's there by the time we run. | |
848 | */ | |
849 | start_receiving_object(arg->receiveop, con, (char *)(arg->tuplep), | |
850 | TUPLE_T); | |
851 | /* | |
852 | * Requeue ourselves behind the receive operation. | |
853 | */ | |
854 | ||
855 | (void) requeue_operation(con, CON_INPUT, op); | |
856 | return OP_REQUEUED; | |
857 | } | |
858 | ||
859 | ||
860 | ||
861 | /*----------------------------------------------------------*/ | |
862 | /* | |
863 | /* g_i2acc | |
864 | /* | |
865 | /* Second init routine for accepting a connection. | |
866 | /* This one is run after the operation is requeued on | |
867 | /* the new connection. By the time we run here, the | |
868 | /* attempt to receive the tuple has already been made. | |
869 | /* We just check on status and clean-up. | |
870 | /* | |
871 | /*----------------------------------------------------------*/ | |
872 | ||
24582af9 | 873 | /*ARGSUSED*/ |
5580185e | 874 | int |
875 | g_i2acc(op, hcon, arg) | |
876 | OPERATION op; | |
877 | HALF_CONNECTION hcon; | |
878 | struct acc_data *arg; | |
879 | { | |
880 | int rc; | |
881 | ||
882 | rc = OP_STATUS(arg->receiveop); /* if it completes, then */ | |
883 | /* so do we! */ | |
884 | *arg->conp = arg->con; /* give caller the new con */ | |
885 | if (rc != OP_COMPLETE) | |
886 | (void) g_stop_connection(arg->con); | |
887 | /* | |
888 | * Release all transient data structures. | |
889 | */ | |
890 | g_clnup_accept(arg); | |
891 | ||
892 | return OP_COMPLETE; | |
893 | } | |
894 | ||
895 | /*----------------------------------------------------------*/ | |
896 | /* | |
897 | /* g_clnup_accept | |
898 | /* | |
899 | /* Free all data structures used by start_accepting_client. | |
900 | /* | |
901 | /*----------------------------------------------------------*/ | |
902 | ||
903 | int | |
904 | g_clnup_accept(arg) | |
905 | struct acc_data *arg; | |
906 | { | |
907 | delete_operation(arg->listenop); | |
908 | delete_operation(arg->receiveop); | |
909 | db_free((char *)arg, sizeof(struct acc_data)); | |
910 | } |