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922247c6 AS |
1 | /* |
2 | * Copyright (c) 2016 Cloudbase Solutions Srl | |
3 | * | |
4 | * Licensed under the Apache License, Version 2.0 (the "License"); | |
5 | * you may not use this file except in compliance with the License. | |
6 | * You may obtain a copy of the License at | |
7 | * | |
8 | * http://www.apache.org/licenses/LICENSE-2.0 | |
9 | * | |
10 | * Unless required by applicable law or agreed to in writing, software | |
11 | * distributed under the License is distributed on an "AS IS" BASIS, | |
12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | |
13 | * See the License for the specific language governing permissions and | |
14 | * limitations under the License. | |
15 | */ | |
16 | ||
17 | #include <config.h> | |
18 | #include <errno.h> | |
19 | #include <sys/types.h> | |
20 | #include <stdlib.h> | |
21 | #include <string.h> | |
22 | #include <unistd.h> | |
23 | #include "poll-loop.h" | |
24 | #include "dirs.h" | |
25 | #include "util.h" | |
26 | #include "stream-provider.h" | |
27 | #include "openvswitch/vlog.h" | |
28 | ||
29 | VLOG_DEFINE_THIS_MODULE(stream_windows); | |
30 | ||
31 | static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(10, 25); | |
32 | ||
33 | static void maybe_unlink_and_free(char *path); | |
34 | ||
35 | /* Suggested buffer size at the creation of the named pipe for reading and | |
36 | * and writing operations. */ | |
37 | #define BUFSIZE 65000 | |
38 | ||
39 | /* Default prefix of a local named pipe. */ | |
40 | #define LOCAL_PREFIX "\\\\.\\pipe\\" | |
41 | ||
42 | /* This function has the purpose to remove all the slashes received in s. */ | |
43 | static char * | |
44 | remove_slashes(char *s) | |
45 | { | |
46 | char *p1, *p2; | |
47 | p1 = p2 = s; | |
48 | ||
49 | while (*p1) { | |
50 | if ((*p1) == '\\' || (*p1) == '/') { | |
51 | p1++; | |
52 | } else { | |
53 | *p2 = *p1; | |
54 | p2++; | |
55 | p1++; | |
56 | } | |
57 | } | |
58 | *p2 = '\0'; | |
59 | return s; | |
60 | } | |
61 | ||
62 | /* Active named pipe. */ | |
63 | struct windows_stream | |
64 | { | |
65 | struct stream stream; | |
66 | HANDLE fd; | |
67 | /* Overlapped operations used for reading/writing. */ | |
68 | OVERLAPPED read; | |
69 | OVERLAPPED write; | |
70 | /* Flag to check if a reading/writing operation is pending. */ | |
71 | bool read_pending; | |
72 | bool write_pending; | |
73 | /* Flag to check if fd is a server HANDLE. In the case of a server handle | |
74 | * we have to issue a disconnect before closing the actual handle. */ | |
75 | bool server; | |
76 | bool retry_connect; | |
77 | char *pipe_path; | |
78 | }; | |
79 | ||
80 | static struct windows_stream * | |
81 | stream_windows_cast(struct stream *stream) | |
82 | { | |
83 | stream_assert_class(stream, &windows_stream_class); | |
84 | return CONTAINER_OF(stream, struct windows_stream, stream); | |
85 | } | |
86 | ||
87 | static HANDLE | |
88 | create_snpipe(char *path) | |
89 | { | |
90 | return CreateFile(path, GENERIC_READ | GENERIC_WRITE, 0, NULL, | |
91 | OPEN_EXISTING, | |
92 | FILE_ATTRIBUTE_NORMAL | FILE_FLAG_OVERLAPPED | | |
93 | FILE_FLAG_NO_BUFFERING, | |
94 | NULL); | |
95 | } | |
96 | ||
97 | /* Active named pipe open. */ | |
98 | static int | |
99 | windows_open(const char *name, char *suffix, struct stream **streamp, | |
100 | uint8_t dscp OVS_UNUSED) | |
101 | { | |
102 | char *connect_path; | |
103 | HANDLE npipe; | |
104 | DWORD mode = PIPE_READMODE_BYTE; | |
105 | char *path; | |
106 | FILE *file; | |
107 | bool retry = false; | |
108 | /* If the path does not contain a ':', assume it is relative to | |
109 | * OVS_RUNDIR. */ | |
110 | if (!strchr(suffix, ':')) { | |
111 | path = xasprintf("%s/%s", ovs_rundir(), suffix); | |
112 | } else { | |
113 | path = xstrdup(suffix); | |
114 | } | |
115 | ||
116 | /* In case of "unix:" argument, the assumption is that there is a file | |
117 | * created in the path (name). */ | |
118 | file = fopen(path, "r"); | |
119 | if (!file) { | |
120 | free(path); | |
121 | VLOG_DBG_RL(&rl, "%s: could not open %s (%s)", name, suffix, | |
122 | ovs_strerror(errno)); | |
123 | return ENOENT; | |
124 | } else { | |
125 | fclose(file); | |
126 | } | |
127 | ||
128 | /* Valid pipe names do not have slashes. The assumption is that the named | |
129 | * pipe was created with the name "path", with slashes removed and the | |
130 | * default prefix \\.\pipe\ appended. | |
131 | * Strip the slashes from the parameter name and append the default prefix. | |
132 | */ | |
133 | connect_path = xasprintf("%s%s", LOCAL_PREFIX, remove_slashes(path)); | |
134 | free(path); | |
135 | ||
136 | /* Try to connect to the named pipe. In case all pipe instances are | |
137 | * busy we set the retry flag to true and retry again during the | |
138 | * connect function. Use overlapped flag and file no buffering to ensure | |
139 | * asynchronous operations. */ | |
140 | npipe = create_snpipe(connect_path); | |
141 | ||
142 | if (npipe == INVALID_HANDLE_VALUE && GetLastError() == ERROR_PIPE_BUSY) { | |
143 | retry = true; | |
144 | } | |
145 | ||
146 | if (!retry && npipe == INVALID_HANDLE_VALUE) { | |
147 | VLOG_ERR_RL(&rl, "Could not connect to named pipe: %s", | |
148 | ovs_lasterror_to_string()); | |
149 | free(connect_path); | |
150 | return ENOENT; | |
151 | } | |
152 | if (!retry && !SetNamedPipeHandleState(npipe, &mode, NULL, NULL)) { | |
153 | VLOG_ERR_RL(&rl, "Could not set named pipe options: %s", | |
154 | ovs_lasterror_to_string()); | |
155 | free(connect_path); | |
156 | CloseHandle(npipe); | |
157 | return ENOENT; | |
158 | } | |
159 | struct windows_stream *s = xmalloc(sizeof *s); | |
160 | stream_init(&s->stream, &windows_stream_class, 0, name); | |
161 | s->pipe_path = connect_path; | |
162 | s->fd = npipe; | |
163 | /* This is an active stream. */ | |
164 | s->server = false; | |
165 | /* Create events for reading and writing to be signaled later. */ | |
166 | memset(&s->read, 0, sizeof(s->read)); | |
167 | memset(&s->write, 0, sizeof(s->write)); | |
168 | s->read.hEvent = CreateEvent(NULL, TRUE, TRUE, NULL); | |
169 | s->write.hEvent = CreateEvent(NULL, TRUE, TRUE, NULL); | |
170 | /* Initial read and write operations are not pending. */ | |
171 | s->read_pending = false; | |
172 | s->write_pending = false; | |
173 | s->retry_connect = retry; | |
174 | *streamp = &s->stream; | |
175 | return 0; | |
176 | } | |
177 | ||
178 | /* Active named pipe close. */ | |
179 | static void | |
180 | windows_close(struct stream *stream) | |
181 | { | |
182 | struct windows_stream *s = stream_windows_cast(stream); | |
183 | /* Disconnect the named pipe in case it was created from a passive stream. | |
184 | */ | |
185 | if (s->server) { | |
67fd9060 AS |
186 | /* Flush the pipe to allow the client to read the pipe's contents |
187 | * before disconnecting. */ | |
188 | FlushFileBuffers(s->fd); | |
922247c6 AS |
189 | DisconnectNamedPipe(s->fd); |
190 | } | |
191 | CloseHandle(s->fd); | |
192 | CloseHandle(s->read.hEvent); | |
193 | CloseHandle(s->write.hEvent); | |
194 | if (s->pipe_path) { | |
195 | free(s->pipe_path); | |
196 | } | |
197 | free(s); | |
198 | } | |
199 | ||
200 | /* Active named pipe connect. */ | |
201 | static int | |
202 | windows_connect(struct stream *stream) | |
203 | { | |
204 | struct windows_stream *s = stream_windows_cast(stream); | |
205 | ||
206 | if (!s->retry_connect) { | |
207 | return 0; | |
208 | } else { | |
209 | HANDLE npipe; | |
210 | npipe = create_snpipe(s->pipe_path); | |
211 | if (npipe == INVALID_HANDLE_VALUE) { | |
212 | if (GetLastError() == ERROR_PIPE_BUSY) { | |
213 | return EAGAIN; | |
214 | } else { | |
215 | s->retry_connect = false; | |
216 | return ENOENT; | |
217 | } | |
218 | } | |
219 | s->retry_connect = false; | |
220 | s->fd = npipe; | |
221 | return 0; | |
222 | } | |
223 | } | |
224 | ||
225 | /* Active named pipe receive. */ | |
226 | static ssize_t | |
227 | windows_recv(struct stream *stream, void *buffer, size_t n) | |
228 | { | |
229 | struct windows_stream *s = stream_windows_cast(stream); | |
230 | ssize_t retval = 0; | |
231 | boolean result = false; | |
232 | DWORD last_error = 0; | |
233 | LPOVERLAPPED ov = NULL; | |
234 | ov = &s->read; | |
235 | ||
236 | /* If the read operation was pending, we verify its result. */ | |
237 | if (s->read_pending) { | |
238 | if (!GetOverlappedResult(s->fd, ov, &(DWORD)retval, FALSE)) { | |
239 | last_error = GetLastError(); | |
240 | if (last_error == ERROR_IO_INCOMPLETE) { | |
241 | /* If the operation is still pending, retry again. */ | |
242 | s->read_pending = true; | |
243 | return -EAGAIN; | |
244 | } else if (last_error == ERROR_PIPE_NOT_CONNECTED | |
245 | || last_error == ERROR_BAD_PIPE | |
246 | || last_error == ERROR_NO_DATA | |
247 | || last_error == ERROR_BROKEN_PIPE) { | |
248 | /* If the pipe was disconnected, return 0. */ | |
249 | return 0; | |
250 | } else { | |
251 | VLOG_ERR_RL(&rl, "Could not receive data on named pipe. Last " | |
252 | "error: %s", ovs_lasterror_to_string()); | |
253 | return -EINVAL; | |
254 | } | |
255 | } | |
256 | s->read_pending = false; | |
257 | return retval; | |
258 | } | |
259 | ||
260 | result = ReadFile(s->fd, buffer, n, &(DWORD)retval, ov); | |
261 | ||
262 | if (!result && GetLastError() == ERROR_IO_PENDING) { | |
263 | /* Mark the read operation as pending. */ | |
264 | s->read_pending = true; | |
265 | return -EAGAIN; | |
266 | } else if (!result) { | |
267 | last_error = GetLastError(); | |
268 | if (last_error == ERROR_PIPE_NOT_CONNECTED | |
269 | || last_error == ERROR_BAD_PIPE | |
270 | || last_error == ERROR_NO_DATA | |
271 | || last_error == ERROR_BROKEN_PIPE) { | |
272 | /* If the pipe was disconnected, return 0. */ | |
273 | return 0; | |
274 | } | |
275 | VLOG_ERR_RL(&rl, "Could not receive data synchronous on named pipe." | |
276 | "Last error: %s", ovs_lasterror_to_string()); | |
277 | return -EINVAL; | |
278 | } | |
279 | ||
280 | return retval; | |
281 | } | |
282 | ||
283 | /* Active named pipe send. */ | |
284 | static ssize_t | |
285 | windows_send(struct stream *stream, const void *buffer, size_t n) | |
286 | { | |
287 | struct windows_stream *s = stream_windows_cast(stream); | |
288 | ssize_t retval = 0; | |
289 | boolean result = false; | |
290 | DWORD last_error = 0; | |
291 | LPOVERLAPPED ov = NULL; | |
292 | ov = &s->write; | |
293 | ||
294 | /* If the send operation was pending, we verify the result. */ | |
295 | if (s->write_pending) { | |
296 | if (!GetOverlappedResult(s->fd, ov, &(DWORD)retval, FALSE)) { | |
297 | last_error = GetLastError(); | |
298 | if (last_error == ERROR_IO_INCOMPLETE) { | |
299 | /* If the operation is still pending, retry again. */ | |
300 | s->write_pending = true; | |
301 | return -EAGAIN; | |
302 | } else if (last_error == ERROR_PIPE_NOT_CONNECTED | |
303 | || last_error == ERROR_BAD_PIPE | |
304 | || last_error == ERROR_NO_DATA | |
305 | || last_error == ERROR_BROKEN_PIPE) { | |
306 | /* If the pipe was disconnected, return connection reset. */ | |
307 | return -WSAECONNRESET; | |
308 | } else { | |
309 | VLOG_ERR_RL(&rl, "Could not send data on named pipe. Last " | |
310 | "error: %s", ovs_lasterror_to_string()); | |
311 | return -EINVAL; | |
312 | } | |
313 | } | |
314 | s->write_pending = false; | |
315 | return retval; | |
316 | } | |
317 | ||
318 | result = WriteFile(s->fd, buffer, n, &(DWORD)retval, ov); | |
319 | last_error = GetLastError(); | |
320 | if (!result && GetLastError() == ERROR_IO_PENDING) { | |
321 | /* Mark the send operation as pending. */ | |
322 | s->write_pending = true; | |
323 | return -EAGAIN; | |
324 | } else if (!result && (last_error == ERROR_PIPE_NOT_CONNECTED | |
325 | || last_error == ERROR_BAD_PIPE | |
326 | || last_error == ERROR_NO_DATA | |
327 | || last_error == ERROR_BROKEN_PIPE)) { | |
328 | /* If the pipe was disconnected, return connection reset. */ | |
329 | return -WSAECONNRESET; | |
330 | } else if (!result) { | |
331 | VLOG_ERR_RL(&rl, "Could not send data on synchronous named pipe. Last " | |
332 | "error: %s", ovs_lasterror_to_string()); | |
333 | return -EINVAL; | |
334 | } | |
335 | return (retval > 0 ? retval : -EAGAIN); | |
336 | } | |
337 | ||
338 | /* Active named pipe wait. */ | |
339 | static void | |
340 | windows_wait(struct stream *stream, enum stream_wait_type wait) | |
341 | { | |
342 | struct windows_stream *s = stream_windows_cast(stream); | |
343 | switch (wait) { | |
344 | case STREAM_SEND: | |
345 | poll_wevent_wait(s->write.hEvent); | |
346 | break; | |
347 | ||
348 | case STREAM_CONNECT: | |
349 | poll_immediate_wake(); | |
350 | break; | |
351 | ||
352 | case STREAM_RECV: | |
353 | poll_wevent_wait(s->read.hEvent); | |
354 | break; | |
355 | ||
356 | default: | |
357 | OVS_NOT_REACHED(); | |
358 | } | |
359 | } | |
360 | ||
361 | /* Passive named pipe. */ | |
362 | const struct stream_class windows_stream_class = { | |
363 | "unix", /* name */ | |
364 | false, /* needs_probes */ | |
365 | windows_open, /* open */ | |
366 | windows_close, /* close */ | |
367 | windows_connect, /* connect */ | |
368 | windows_recv, /* recv */ | |
369 | windows_send, /* send */ | |
370 | NULL, /* run */ | |
371 | NULL, /* run_wait */ | |
372 | windows_wait, /* wait */ | |
373 | }; | |
374 | ||
375 | struct pwindows_pstream | |
376 | { | |
377 | struct pstream pstream; | |
378 | HANDLE fd; | |
379 | /* Unlink path to be deleted during close. */ | |
380 | char *unlink_path; | |
381 | /* Overlapped operation used for connect. */ | |
382 | OVERLAPPED connect; | |
383 | /* Flag to check if an operation is pending. */ | |
384 | bool pending; | |
385 | /* String used to create the named pipe. */ | |
386 | char *pipe_path; | |
387 | }; | |
388 | ||
389 | const struct pstream_class pwindows_pstream_class; | |
390 | ||
391 | static struct pwindows_pstream * | |
392 | pwindows_pstream_cast(struct pstream *pstream) | |
393 | { | |
394 | pstream_assert_class(pstream, &pwindows_pstream_class); | |
395 | return CONTAINER_OF(pstream, struct pwindows_pstream, pstream); | |
396 | } | |
397 | ||
398 | /* Create a named pipe with read/write access, overlapped, message mode for | |
399 | * writing, byte mode for reading and with a maximum of 64 active instances. */ | |
400 | static HANDLE | |
401 | create_pnpipe(char *name) | |
402 | { | |
403 | SECURITY_ATTRIBUTES sa; | |
404 | sa.nLength = sizeof(sa); | |
405 | sa.lpSecurityDescriptor = NULL; | |
406 | sa.bInheritHandle = TRUE; | |
407 | if (strlen(name) > 256) { | |
408 | VLOG_ERR_RL(&rl, "Named pipe name too long."); | |
409 | return INVALID_HANDLE_VALUE; | |
410 | } | |
411 | return CreateNamedPipe(name, PIPE_ACCESS_DUPLEX | FILE_FLAG_OVERLAPPED, | |
412 | PIPE_TYPE_MESSAGE | PIPE_READMODE_BYTE | PIPE_WAIT, | |
413 | 64, BUFSIZE, BUFSIZE, 0, &sa); | |
414 | } | |
415 | ||
416 | /* Passive named pipe connect. This function creates a new named pipe and | |
417 | * passes the old handle to the active stream. */ | |
418 | static int | |
419 | pwindows_accept(struct pstream *pstream, struct stream **new_streamp) | |
420 | { | |
421 | struct pwindows_pstream *p = pwindows_pstream_cast(pstream); | |
422 | DWORD last_error = 0; | |
423 | DWORD cbRet; | |
424 | HANDLE npipe; | |
425 | ||
426 | /* If the connect operation was pending, verify the result. */ | |
427 | if (p->pending) { | |
428 | if (!GetOverlappedResult(p->fd, &p->connect, &cbRet, FALSE)) { | |
429 | last_error = GetLastError(); | |
430 | if (last_error == ERROR_IO_INCOMPLETE) { | |
431 | /* If the operation is still pending, retry again. */ | |
432 | p->pending = true; | |
433 | return EAGAIN; | |
434 | } else { | |
435 | VLOG_ERR_RL(&rl, "Could not connect named pipe. Last " | |
436 | "error: %s", ovs_lasterror_to_string()); | |
f4df0f09 | 437 | DisconnectNamedPipe(p->fd); |
922247c6 AS |
438 | return EINVAL; |
439 | } | |
440 | } | |
441 | p->pending = false; | |
442 | } | |
443 | ||
444 | if (!p->pending && !ConnectNamedPipe(p->fd, &p->connect)) { | |
445 | last_error = GetLastError(); | |
446 | if (last_error == ERROR_IO_PENDING) { | |
447 | /* Mark the accept operation as pending. */ | |
448 | p->pending = true; | |
449 | return EAGAIN; | |
450 | } else if (last_error != ERROR_PIPE_CONNECTED) { | |
451 | VLOG_ERR_RL(&rl, "Could not connect synchronous named pipe. Last " | |
452 | "error: %s", ovs_lasterror_to_string()); | |
f4df0f09 | 453 | DisconnectNamedPipe(p->fd); |
922247c6 AS |
454 | return EINVAL; |
455 | } else { | |
456 | /* If the pipe is connected, signal an event. */ | |
457 | SetEvent(&p->connect.hEvent); | |
458 | } | |
459 | } | |
460 | ||
461 | npipe = create_pnpipe(p->pipe_path); | |
462 | if (npipe == INVALID_HANDLE_VALUE) { | |
463 | VLOG_ERR_RL(&rl, "Could not create a new named pipe after connect. ", | |
464 | ovs_lasterror_to_string()); | |
465 | return ENOENT; | |
466 | } | |
467 | ||
468 | /* Give the handle p->fd to the new created active stream and specify it | |
469 | * was created by an active stream. */ | |
470 | struct windows_stream *p_temp = xmalloc(sizeof *p_temp); | |
471 | stream_init(&p_temp->stream, &windows_stream_class, 0, "unix"); | |
472 | p_temp->fd = p->fd; | |
473 | /* Specify it was created by a passive stream. */ | |
474 | p_temp->server = true; | |
475 | /* Create events for read/write operations. */ | |
476 | memset(&p_temp->read, 0, sizeof(p_temp->read)); | |
477 | memset(&p_temp->write, 0, sizeof(p_temp->write)); | |
478 | p_temp->read.hEvent = CreateEvent(NULL, TRUE, TRUE, NULL); | |
479 | p_temp->write.hEvent = CreateEvent(NULL, TRUE, TRUE, NULL); | |
480 | p_temp->read_pending = false; | |
481 | p_temp->write_pending = false; | |
482 | p_temp->retry_connect = false; | |
483 | p_temp->pipe_path = NULL; | |
484 | *new_streamp = &p_temp->stream; | |
485 | ||
486 | /* The passive handle p->fd will be the new created handle. */ | |
487 | p->fd = npipe; | |
488 | memset(&p->connect, 0, sizeof(p->connect)); | |
489 | p->connect.hEvent = CreateEvent(NULL, TRUE, TRUE, NULL); | |
490 | p->pending = false; | |
491 | return 0; | |
492 | } | |
493 | ||
494 | /* Passive named pipe close. */ | |
495 | static void | |
496 | pwindows_close(struct pstream *pstream) | |
497 | { | |
498 | struct pwindows_pstream *p = pwindows_pstream_cast(pstream); | |
499 | DisconnectNamedPipe(p->fd); | |
500 | CloseHandle(p->fd); | |
501 | CloseHandle(p->connect.hEvent); | |
502 | maybe_unlink_and_free(p->unlink_path); | |
503 | free(p->pipe_path); | |
504 | free(p); | |
505 | } | |
506 | ||
507 | /* Passive named pipe wait. */ | |
508 | static void | |
509 | pwindows_wait(struct pstream *pstream) | |
510 | { | |
511 | struct pwindows_pstream *p = pwindows_pstream_cast(pstream); | |
512 | poll_wevent_wait(p->connect.hEvent); | |
513 | } | |
514 | ||
515 | /* Passive named pipe. */ | |
516 | static int | |
517 | pwindows_open(const char *name OVS_UNUSED, char *suffix, | |
518 | struct pstream **pstreamp, uint8_t dscp OVS_UNUSED) | |
519 | { | |
520 | char *bind_path; | |
521 | int error; | |
522 | HANDLE npipe; | |
523 | char *orig_path; | |
524 | ||
525 | char *path; | |
526 | if (!strchr(suffix, ':')) { | |
527 | path = xasprintf("%s/%s", ovs_rundir(), suffix); | |
528 | } else { | |
529 | path = xstrdup(suffix); | |
530 | } | |
531 | ||
532 | /* Try to create a file under the path location. */ | |
533 | FILE *file = fopen(path, "w"); | |
534 | if (!file) { | |
535 | free(path); | |
536 | error = errno; | |
537 | VLOG_DBG_RL(&rl, "could not open %s (%s)", path, ovs_strerror(error)); | |
538 | return error; | |
539 | } else { | |
540 | fclose(file); | |
541 | } | |
542 | ||
543 | orig_path = xstrdup(path); | |
544 | /* Strip slashes from path and create a named pipe using that newly created | |
545 | * string. */ | |
546 | bind_path = xasprintf("%s%s", LOCAL_PREFIX, remove_slashes(path)); | |
547 | free(path); | |
548 | ||
549 | npipe = create_pnpipe(bind_path); | |
550 | ||
551 | if (npipe == INVALID_HANDLE_VALUE) { | |
552 | VLOG_ERR_RL(&rl, "Could not create named pipe. Last error: %s", | |
553 | ovs_lasterror_to_string()); | |
554 | return ENOENT; | |
555 | } | |
556 | ||
557 | struct pwindows_pstream *p = xmalloc(sizeof *p); | |
558 | pstream_init(&p->pstream, &pwindows_pstream_class, name); | |
559 | p->fd = npipe; | |
560 | p->unlink_path = orig_path; | |
561 | memset(&p->connect, 0, sizeof(p->connect)); | |
562 | p->connect.hEvent = CreateEvent(NULL, TRUE, TRUE, NULL); | |
563 | p->pending = false; | |
564 | p->pipe_path = bind_path; | |
565 | *pstreamp = &p->pstream; | |
566 | return 0; | |
567 | } | |
568 | ||
569 | const struct pstream_class pwindows_pstream_class = { | |
570 | "punix", | |
571 | false, /* probes */ | |
572 | pwindows_open, /* open */ | |
573 | pwindows_close, /* close */ | |
574 | pwindows_accept, /* accept */ | |
575 | pwindows_wait, /* wait */ | |
576 | }; | |
577 | ||
578 | /* Helper functions. */ | |
579 | static void | |
580 | maybe_unlink_and_free(char *path) | |
581 | { | |
582 | if (path) { | |
583 | fatal_signal_unlink_file_now(path); | |
584 | free(path); | |
585 | } | |
586 | } |