PostgreSQL Source Code: src/interfaces/libpq/fe-misc.c Source File

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fe-misc.c
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1/*-------------------------------------------------------------------------
2 *
3 * FILE
4 * fe-misc.c
5 *
6 * DESCRIPTION
7 * miscellaneous useful functions
8 *
9 * The communication routines here are analogous to the ones in
10 * backend/libpq/pqcomm.c and backend/libpq/pqformat.c, but operate
11 * in the considerably different environment of the frontend libpq.
12 * In particular, we work with a bare nonblock-mode socket, rather than
13 * a stdio stream, so that we can avoid unwanted blocking of the application.
14 *
15 * XXX: MOVE DEBUG PRINTOUT TO HIGHER LEVEL. As is, block and restart
16 * will cause repeat printouts.
17 *
18 * We must speak the same transmitted data representations as the backend
19 * routines.
20 *
21 *
22 * Portions Copyright (c) 1996-2025, PostgreSQL Global Development Group
23 * Portions Copyright (c) 1994, Regents of the University of California
24 *
25 * IDENTIFICATION
26 * src/interfaces/libpq/fe-misc.c
27 *
28 *-------------------------------------------------------------------------
29 */
30
31#include "postgres_fe.h"
32
33#include <signal.h>
34#include <time.h>
35
36#ifdef WIN32
37#include "win32.h"
38#else
39#include <unistd.h>
40#include <sys/select.h>
41#include <sys/time.h>
42#endif
43
44#ifdef HAVE_POLL_H
45#include <poll.h>
46#endif
47
48#include "libpq-fe.h"
49#include "libpq-int.h"
50#include "mb/pg_wchar.h"
51#include "pg_config_paths.h"
52#include "port/pg_bswap.h"
53
54static int pqPutMsgBytes(const void *buf, size_t len, PGconn *conn);
55static int pqSendSome(PGconn *conn, int len);
56static int pqSocketCheck(PGconn *conn, int forRead, int forWrite,
57 pg_usec_time_t end_time);
58
59/*
60 * PQlibVersion: return the libpq version number
61 */
62int
63 PQlibVersion(void)
64{
65 return PG_VERSION_NUM;
66}
67
68
69/*
70 * pqGetc: read 1 character from the connection
71 *
72 * All these routines return 0 on success, EOF on error.
73 * Note that for the Get routines, EOF only means there is not enough
74 * data in the buffer, not that there is necessarily a hard error.
75 */
76int
77 pqGetc(char *result, PGconn *conn)
78{
79 if (conn->inCursor >= conn->inEnd)
80 return EOF;
81
82 *result = conn->inBuffer[conn->inCursor++];
83
84 return 0;
85}
86
87
88/*
89 * pqPutc: write 1 char to the current message
90 */
91int
92 pqPutc(char c, PGconn *conn)
93{
94 if (pqPutMsgBytes(&c, 1, conn))
95 return EOF;
96
97 return 0;
98}
99
100
101/*
102 * pqGets[_append]:
103 * read a null-terminated string from the connection,
104 * and store it in an expansible PQExpBuffer.
105 * If we run out of memory, all of the string is still read,
106 * but the excess characters are silently discarded.
107 */
108static int
109 pqGets_internal(PQExpBuffer buf, PGconn *conn, bool resetbuffer)
110{
111 /* Copy conn data to locals for faster search loop */
112 char *inBuffer = conn->inBuffer;
113 int inCursor = conn->inCursor;
114 int inEnd = conn->inEnd;
115 int slen;
116
117 while (inCursor < inEnd && inBuffer[inCursor])
118 inCursor++;
119
120 if (inCursor >= inEnd)
121 return EOF;
122
123 slen = inCursor - conn->inCursor;
124
125 if (resetbuffer)
126 resetPQExpBuffer(buf);
127
128 appendBinaryPQExpBuffer(buf, inBuffer + conn->inCursor, slen);
129
130 conn->inCursor = ++inCursor;
131
132 return 0;
133}
134
135int
136 pqGets(PQExpBuffer buf, PGconn *conn)
137{
138 return pqGets_internal(buf, conn, true);
139}
140
141int
142 pqGets_append(PQExpBuffer buf, PGconn *conn)
143{
144 return pqGets_internal(buf, conn, false);
145}
146
147
148/*
149 * pqPuts: write a null-terminated string to the current message
150 */
151int
152 pqPuts(const char *s, PGconn *conn)
153{
154 if (pqPutMsgBytes(s, strlen(s) + 1, conn))
155 return EOF;
156
157 return 0;
158}
159
160/*
161 * pqGetnchar:
162 * read exactly len bytes in buffer s, no null termination
163 */
164int
165 pqGetnchar(void *s, size_t len, PGconn *conn)
166{
167 if (len > (size_t) (conn->inEnd - conn->inCursor))
168 return EOF;
169
170 memcpy(s, conn->inBuffer + conn->inCursor, len);
171 /* no terminating null */
172
173 conn->inCursor += len;
174
175 return 0;
176}
177
178/*
179 * pqSkipnchar:
180 * skip over len bytes in input buffer.
181 *
182 * Note: this is primarily useful for its debug output, which should
183 * be exactly the same as for pqGetnchar. We assume the data in question
184 * will actually be used, but just isn't getting copied anywhere as yet.
185 */
186int
187 pqSkipnchar(size_t len, PGconn *conn)
188{
189 if (len > (size_t) (conn->inEnd - conn->inCursor))
190 return EOF;
191
192 conn->inCursor += len;
193
194 return 0;
195}
196
197/*
198 * pqPutnchar:
199 * write exactly len bytes to the current message
200 */
201int
202 pqPutnchar(const void *s, size_t len, PGconn *conn)
203{
204 if (pqPutMsgBytes(s, len, conn))
205 return EOF;
206
207 return 0;
208}
209
210/*
211 * pqGetInt
212 * read a 2 or 4 byte integer and convert from network byte order
213 * to local byte order
214 */
215int
216 pqGetInt(int *result, size_t bytes, PGconn *conn)
217{
218 uint16 tmp2;
219 uint32 tmp4;
220
221 switch (bytes)
222 {
223 case 2:
224 if (conn->inCursor + 2 > conn->inEnd)
225 return EOF;
226 memcpy(&tmp2, conn->inBuffer + conn->inCursor, 2);
227 conn->inCursor += 2;
228 *result = (int) pg_ntoh16(tmp2);
229 break;
230 case 4:
231 if (conn->inCursor + 4 > conn->inEnd)
232 return EOF;
233 memcpy(&tmp4, conn->inBuffer + conn->inCursor, 4);
234 conn->inCursor += 4;
235 *result = (int) pg_ntoh32(tmp4);
236 break;
237 default:
238 pqInternalNotice(&conn->noticeHooks,
239 "integer of size %lu not supported by pqGetInt",
240 (unsigned long) bytes);
241 return EOF;
242 }
243
244 return 0;
245}
246
247/*
248 * pqPutInt
249 * write an integer of 2 or 4 bytes, converting from host byte order
250 * to network byte order.
251 */
252int
253 pqPutInt(int value, size_t bytes, PGconn *conn)
254{
255 uint16 tmp2;
256 uint32 tmp4;
257
258 switch (bytes)
259 {
260 case 2:
261 tmp2 = pg_hton16((uint16) value);
262 if (pqPutMsgBytes((const char *) &tmp2, 2, conn))
263 return EOF;
264 break;
265 case 4:
266 tmp4 = pg_hton32((uint32) value);
267 if (pqPutMsgBytes((const char *) &tmp4, 4, conn))
268 return EOF;
269 break;
270 default:
271 pqInternalNotice(&conn->noticeHooks,
272 "integer of size %lu not supported by pqPutInt",
273 (unsigned long) bytes);
274 return EOF;
275 }
276
277 return 0;
278}
279
280/*
281 * Make sure conn's output buffer can hold bytes_needed bytes (caller must
282 * include already-stored data into the value!)
283 *
284 * Returns 0 on success, EOF if failed to enlarge buffer
285 */
286int
287 pqCheckOutBufferSpace(size_t bytes_needed, PGconn *conn)
288{
289 int newsize = conn->outBufSize;
290 char *newbuf;
291
292 /* Quick exit if we have enough space */
293 if (bytes_needed <= (size_t) newsize)
294 return 0;
295
296 /*
297 * If we need to enlarge the buffer, we first try to double it in size; if
298 * that doesn't work, enlarge in multiples of 8K. This avoids thrashing
299 * the malloc pool by repeated small enlargements.
300 *
301 * Note: tests for newsize > 0 are to catch integer overflow.
302 */
303 do
304 {
305 newsize *= 2;
306 } while (newsize > 0 && bytes_needed > (size_t) newsize);
307
308 if (newsize > 0 && bytes_needed <= (size_t) newsize)
309 {
310 newbuf = realloc(conn->outBuffer, newsize);
311 if (newbuf)
312 {
313 /* realloc succeeded */
314 conn->outBuffer = newbuf;
315 conn->outBufSize = newsize;
316 return 0;
317 }
318 }
319
320 newsize = conn->outBufSize;
321 do
322 {
323 newsize += 8192;
324 } while (newsize > 0 && bytes_needed > (size_t) newsize);
325
326 if (newsize > 0 && bytes_needed <= (size_t) newsize)
327 {
328 newbuf = realloc(conn->outBuffer, newsize);
329 if (newbuf)
330 {
331 /* realloc succeeded */
332 conn->outBuffer = newbuf;
333 conn->outBufSize = newsize;
334 return 0;
335 }
336 }
337
338 /* realloc failed. Probably out of memory */
339 appendPQExpBufferStr(&conn->errorMessage,
340 "cannot allocate memory for output buffer\n");
341 return EOF;
342}
343
344/*
345 * Make sure conn's input buffer can hold bytes_needed bytes (caller must
346 * include already-stored data into the value!)
347 *
348 * Returns 0 on success, EOF if failed to enlarge buffer
349 */
350int
351 pqCheckInBufferSpace(size_t bytes_needed, PGconn *conn)
352{
353 int newsize = conn->inBufSize;
354 char *newbuf;
355
356 /* Quick exit if we have enough space */
357 if (bytes_needed <= (size_t) newsize)
358 return 0;
359
360 /*
361 * Before concluding that we need to enlarge the buffer, left-justify
362 * whatever is in it and recheck. The caller's value of bytes_needed
363 * includes any data to the left of inStart, but we can delete that in
364 * preference to enlarging the buffer. It's slightly ugly to have this
365 * function do this, but it's better than making callers worry about it.
366 */
367 bytes_needed -= conn->inStart;
368
369 if (conn->inStart < conn->inEnd)
370 {
371 if (conn->inStart > 0)
372 {
373 memmove(conn->inBuffer, conn->inBuffer + conn->inStart,
374 conn->inEnd - conn->inStart);
375 conn->inEnd -= conn->inStart;
376 conn->inCursor -= conn->inStart;
377 conn->inStart = 0;
378 }
379 }
380 else
381 {
382 /* buffer is logically empty, reset it */
383 conn->inStart = conn->inCursor = conn->inEnd = 0;
384 }
385
386 /* Recheck whether we have enough space */
387 if (bytes_needed <= (size_t) newsize)
388 return 0;
389
390 /*
391 * If we need to enlarge the buffer, we first try to double it in size; if
392 * that doesn't work, enlarge in multiples of 8K. This avoids thrashing
393 * the malloc pool by repeated small enlargements.
394 *
395 * Note: tests for newsize > 0 are to catch integer overflow.
396 */
397 do
398 {
399 newsize *= 2;
400 } while (newsize > 0 && bytes_needed > (size_t) newsize);
401
402 if (newsize > 0 && bytes_needed <= (size_t) newsize)
403 {
404 newbuf = realloc(conn->inBuffer, newsize);
405 if (newbuf)
406 {
407 /* realloc succeeded */
408 conn->inBuffer = newbuf;
409 conn->inBufSize = newsize;
410 return 0;
411 }
412 }
413
414 newsize = conn->inBufSize;
415 do
416 {
417 newsize += 8192;
418 } while (newsize > 0 && bytes_needed > (size_t) newsize);
419
420 if (newsize > 0 && bytes_needed <= (size_t) newsize)
421 {
422 newbuf = realloc(conn->inBuffer, newsize);
423 if (newbuf)
424 {
425 /* realloc succeeded */
426 conn->inBuffer = newbuf;
427 conn->inBufSize = newsize;
428 return 0;
429 }
430 }
431
432 /* realloc failed. Probably out of memory */
433 appendPQExpBufferStr(&conn->errorMessage,
434 "cannot allocate memory for input buffer\n");
435 return EOF;
436}
437
438/*
439 * pqParseDone: after a server-to-client message has successfully
440 * been parsed, advance conn->inStart to account for it.
441 */
442void
443 pqParseDone(PGconn *conn, int newInStart)
444{
445 /* trace server-to-client message */
446 if (conn->Pfdebug)
447 pqTraceOutputMessage(conn, conn->inBuffer + conn->inStart, false);
448
449 /* Mark message as done */
450 conn->inStart = newInStart;
451}
452
453/*
454 * pqPutMsgStart: begin construction of a message to the server
455 *
456 * msg_type is the message type byte, or 0 for a message without type byte
457 * (only startup messages have no type byte)
458 *
459 * Returns 0 on success, EOF on error
460 *
461 * The idea here is that we construct the message in conn->outBuffer,
462 * beginning just past any data already in outBuffer (ie, at
463 * outBuffer+outCount). We enlarge the buffer as needed to hold the message.
464 * When the message is complete, we fill in the length word (if needed) and
465 * then advance outCount past the message, making it eligible to send.
466 *
467 * The state variable conn->outMsgStart points to the incomplete message's
468 * length word: it is either outCount or outCount+1 depending on whether
469 * there is a type byte. The state variable conn->outMsgEnd is the end of
470 * the data collected so far.
471 */
472int
473 pqPutMsgStart(char msg_type, PGconn *conn)
474{
475 int lenPos;
476 int endPos;
477
478 /* allow room for message type byte */
479 if (msg_type)
480 endPos = conn->outCount + 1;
481 else
482 endPos = conn->outCount;
483
484 /* do we want a length word? */
485 lenPos = endPos;
486 /* allow room for message length */
487 endPos += 4;
488
489 /* make sure there is room for message header */
490 if (pqCheckOutBufferSpace(endPos, conn))
491 return EOF;
492 /* okay, save the message type byte if any */
493 if (msg_type)
494 conn->outBuffer[conn->outCount] = msg_type;
495 /* set up the message pointers */
496 conn->outMsgStart = lenPos;
497 conn->outMsgEnd = endPos;
498 /* length word, if needed, will be filled in by pqPutMsgEnd */
499
500 return 0;
501}
502
503/*
504 * pqPutMsgBytes: add bytes to a partially-constructed message
505 *
506 * Returns 0 on success, EOF on error
507 */
508static int
509 pqPutMsgBytes(const void *buf, size_t len, PGconn *conn)
510{
511 /* make sure there is room for it */
512 if (pqCheckOutBufferSpace(conn->outMsgEnd + len, conn))
513 return EOF;
514 /* okay, save the data */
515 memcpy(conn->outBuffer + conn->outMsgEnd, buf, len);
516 conn->outMsgEnd += len;
517 /* no Pfdebug call here, caller should do it */
518 return 0;
519}
520
521/*
522 * pqPutMsgEnd: finish constructing a message and possibly send it
523 *
524 * Returns 0 on success, EOF on error
525 *
526 * We don't actually send anything here unless we've accumulated at least
527 * 8K worth of data (the typical size of a pipe buffer on Unix systems).
528 * This avoids sending small partial packets. The caller must use pqFlush
529 * when it's important to flush all the data out to the server.
530 */
531int
532 pqPutMsgEnd(PGconn *conn)
533{
534 /* Fill in length word if needed */
535 if (conn->outMsgStart >= 0)
536 {
537 uint32 msgLen = conn->outMsgEnd - conn->outMsgStart;
538
539 msgLen = pg_hton32(msgLen);
540 memcpy(conn->outBuffer + conn->outMsgStart, &msgLen, 4);
541 }
542
543 /* trace client-to-server message */
544 if (conn->Pfdebug)
545 {
546 if (conn->outCount < conn->outMsgStart)
547 pqTraceOutputMessage(conn, conn->outBuffer + conn->outCount, true);
548 else
549 pqTraceOutputNoTypeByteMessage(conn,
550 conn->outBuffer + conn->outMsgStart);
551 }
552
553 /* Make message eligible to send */
554 conn->outCount = conn->outMsgEnd;
555
556 /* If appropriate, try to push out some data */
557 if (conn->outCount >= 8192)
558 {
559 int toSend = conn->outCount;
560
561 /*
562 * On Unix-pipe connections, it seems profitable to prefer sending
563 * pipe-buffer-sized packets not randomly-sized ones, so retain the
564 * last partial-8K chunk in our buffer for now. On TCP connections,
565 * the advantage of that is far less clear. Moreover, it flat out
566 * isn't safe when using SSL or GSSAPI, because those code paths have
567 * API stipulations that if they fail to send all the data that was
568 * offered in the previous write attempt, we mustn't offer less data
569 * in this write attempt. The previous write attempt might've been
570 * pqFlush attempting to send everything in the buffer, so we mustn't
571 * offer less now. (Presently, we won't try to use SSL or GSSAPI on
572 * Unix connections, so those checks are just Asserts. They'll have
573 * to become part of the regular if-test if we ever change that.)
574 */
575 if (conn->raddr.addr.ss_family == AF_UNIX)
576 {
577#ifdef USE_SSL
578 Assert(!conn->ssl_in_use);
579#endif
580#ifdef ENABLE_GSS
581 Assert(!conn->gssenc);
582#endif
583 toSend -= toSend % 8192;
584 }
585
586 if (pqSendSome(conn, toSend) < 0)
587 return EOF;
588 /* in nonblock mode, don't complain if unable to send it all */
589 }
590
591 return 0;
592}
593
594/* ----------
595 * pqReadData: read more data, if any is available
596 * Possible return values:
597 * 1: successfully loaded at least one more byte
598 * 0: no data is presently available, but no error detected
599 * -1: error detected (including EOF = connection closure);
600 * conn->errorMessage set
601 * NOTE: callers must not assume that pointers or indexes into conn->inBuffer
602 * remain valid across this call!
603 * ----------
604 */
605int
606 pqReadData(PGconn *conn)
607{
608 int someread = 0;
609 int nread;
610
611 if (conn->sock == PGINVALID_SOCKET)
612 {
613 libpq_append_conn_error(conn, "connection not open");
614 return -1;
615 }
616
617 /* Left-justify any data in the buffer to make room */
618 if (conn->inStart < conn->inEnd)
619 {
620 if (conn->inStart > 0)
621 {
622 memmove(conn->inBuffer, conn->inBuffer + conn->inStart,
623 conn->inEnd - conn->inStart);
624 conn->inEnd -= conn->inStart;
625 conn->inCursor -= conn->inStart;
626 conn->inStart = 0;
627 }
628 }
629 else
630 {
631 /* buffer is logically empty, reset it */
632 conn->inStart = conn->inCursor = conn->inEnd = 0;
633 }
634
635 /*
636 * If the buffer is fairly full, enlarge it. We need to be able to enlarge
637 * the buffer in case a single message exceeds the initial buffer size. We
638 * enlarge before filling the buffer entirely so as to avoid asking the
639 * kernel for a partial packet. The magic constant here should be large
640 * enough for a TCP packet or Unix pipe bufferload. 8K is the usual pipe
641 * buffer size, so...
642 */
643 if (conn->inBufSize - conn->inEnd < 8192)
644 {
645 if (pqCheckInBufferSpace(conn->inEnd + (size_t) 8192, conn))
646 {
647 /*
648 * We don't insist that the enlarge worked, but we need some room
649 */
650 if (conn->inBufSize - conn->inEnd < 100)
651 return -1; /* errorMessage already set */
652 }
653 }
654
655 /* OK, try to read some data */
656retry3:
657 nread = pqsecure_read(conn, conn->inBuffer + conn->inEnd,
658 conn->inBufSize - conn->inEnd);
659 if (nread < 0)
660 {
661 switch (SOCK_ERRNO)
662 {
663 case EINTR:
664 goto retry3;
665
666 /* Some systems return EAGAIN/EWOULDBLOCK for no data */
667#ifdef EAGAIN
668 case EAGAIN:
669 return someread;
670#endif
671#if defined(EWOULDBLOCK) && (!defined(EAGAIN) || (EWOULDBLOCK != EAGAIN))
672 case EWOULDBLOCK:
673 return someread;
674#endif
675
676 /* We might get ECONNRESET etc here if connection failed */
677 case ALL_CONNECTION_FAILURE_ERRNOS:
678 goto definitelyFailed;
679
680 default:
681 /* pqsecure_read set the error message for us */
682 return -1;
683 }
684 }
685 if (nread > 0)
686 {
687 conn->inEnd += nread;
688
689 /*
690 * Hack to deal with the fact that some kernels will only give us back
691 * 1 packet per recv() call, even if we asked for more and there is
692 * more available. If it looks like we are reading a long message,
693 * loop back to recv() again immediately, until we run out of data or
694 * buffer space. Without this, the block-and-restart behavior of
695 * libpq's higher levels leads to O(N^2) performance on long messages.
696 *
697 * Since we left-justified the data above, conn->inEnd gives the
698 * amount of data already read in the current message. We consider
699 * the message "long" once we have acquired 32k ...
700 */
701 if (conn->inEnd > 32768 &&
702 (conn->inBufSize - conn->inEnd) >= 8192)
703 {
704 someread = 1;
705 goto retry3;
706 }
707 return 1;
708 }
709
710 if (someread)
711 return 1; /* got a zero read after successful tries */
712
713 /*
714 * A return value of 0 could mean just that no data is now available, or
715 * it could mean EOF --- that is, the server has closed the connection.
716 * Since we have the socket in nonblock mode, the only way to tell the
717 * difference is to see if select() is saying that the file is ready.
718 * Grumble. Fortunately, we don't expect this path to be taken much,
719 * since in normal practice we should not be trying to read data unless
720 * the file selected for reading already.
721 *
722 * In SSL mode it's even worse: SSL_read() could say WANT_READ and then
723 * data could arrive before we make the pqReadReady() test, but the second
724 * SSL_read() could still say WANT_READ because the data received was not
725 * a complete SSL record. So we must play dumb and assume there is more
726 * data, relying on the SSL layer to detect true EOF.
727 */
728
729#ifdef USE_SSL
730 if (conn->ssl_in_use)
731 return 0;
732#endif
733
734 switch (pqReadReady(conn))
735 {
736 case 0:
737 /* definitely no data available */
738 return 0;
739 case 1:
740 /* ready for read */
741 break;
742 default:
743 /* we override pqReadReady's message with something more useful */
744 goto definitelyEOF;
745 }
746
747 /*
748 * Still not sure that it's EOF, because some data could have just
749 * arrived.
750 */
751retry4:
752 nread = pqsecure_read(conn, conn->inBuffer + conn->inEnd,
753 conn->inBufSize - conn->inEnd);
754 if (nread < 0)
755 {
756 switch (SOCK_ERRNO)
757 {
758 case EINTR:
759 goto retry4;
760
761 /* Some systems return EAGAIN/EWOULDBLOCK for no data */
762#ifdef EAGAIN
763 case EAGAIN:
764 return 0;
765#endif
766#if defined(EWOULDBLOCK) && (!defined(EAGAIN) || (EWOULDBLOCK != EAGAIN))
767 case EWOULDBLOCK:
768 return 0;
769#endif
770
771 /* We might get ECONNRESET etc here if connection failed */
772 case ALL_CONNECTION_FAILURE_ERRNOS:
773 goto definitelyFailed;
774
775 default:
776 /* pqsecure_read set the error message for us */
777 return -1;
778 }
779 }
780 if (nread > 0)
781 {
782 conn->inEnd += nread;
783 return 1;
784 }
785
786 /*
787 * OK, we are getting a zero read even though select() says ready. This
788 * means the connection has been closed. Cope.
789 */
790definitelyEOF:
791 libpq_append_conn_error(conn, "server closed the connection unexpectedly\n"
792 "\tThis probably means the server terminated abnormally\n"
793 "\tbefore or while processing the request.");
794
795 /* Come here if lower-level code already set a suitable errorMessage */
796definitelyFailed:
797 /* Do *not* drop any already-read data; caller still wants it */
798 pqDropConnection(conn, false);
799 conn->status = CONNECTION_BAD; /* No more connection to backend */
800 return -1;
801}
802
803/*
804 * pqSendSome: send data waiting in the output buffer.
805 *
806 * len is how much to try to send (typically equal to outCount, but may
807 * be less).
808 *
809 * Return 0 on success, -1 on failure and 1 when not all data could be sent
810 * because the socket would block and the connection is non-blocking.
811 *
812 * Note that this is also responsible for consuming data from the socket
813 * (putting it in conn->inBuffer) in any situation where we can't send
814 * all the specified data immediately.
815 *
816 * If a socket-level write failure occurs, conn->write_failed is set and the
817 * error message is saved in conn->write_err_msg, but we clear the output
818 * buffer and return zero anyway; this is because callers should soldier on
819 * until we have read what we can from the server and checked for an error
820 * message. write_err_msg should be reported only when we are unable to
821 * obtain a server error first. Much of that behavior is implemented at
822 * lower levels, but this function deals with some edge cases.
823 */
824static int
825 pqSendSome(PGconn *conn, int len)
826{
827 char *ptr = conn->outBuffer;
828 int remaining = conn->outCount;
829 int result = 0;
830
831 /*
832 * If we already had a write failure, we will never again try to send data
833 * on that connection. Even if the kernel would let us, we've probably
834 * lost message boundary sync with the server. conn->write_failed
835 * therefore persists until the connection is reset, and we just discard
836 * all data presented to be written. However, as long as we still have a
837 * valid socket, we should continue to absorb data from the backend, so
838 * that we can collect any final error messages.
839 */
840 if (conn->write_failed)
841 {
842 /* conn->write_err_msg should be set up already */
843 conn->outCount = 0;
844 /* Absorb input data if any, and detect socket closure */
845 if (conn->sock != PGINVALID_SOCKET)
846 {
847 if (pqReadData(conn) < 0)
848 return -1;
849 }
850 return 0;
851 }
852
853 if (conn->sock == PGINVALID_SOCKET)
854 {
855 conn->write_failed = true;
856 /* Store error message in conn->write_err_msg, if possible */
857 /* (strdup failure is OK, we'll cope later) */
858 conn->write_err_msg = strdup(libpq_gettext("connection not open\n"));
859 /* Discard queued data; no chance it'll ever be sent */
860 conn->outCount = 0;
861 return 0;
862 }
863
864 /* while there's still data to send */
865 while (len > 0)
866 {
867 int sent;
868
869#ifndef WIN32
870 sent = pqsecure_write(conn, ptr, len);
871#else
872
873 /*
874 * Windows can fail on large sends, per KB article Q201213. The
875 * failure-point appears to be different in different versions of
876 * Windows, but 64k should always be safe.
877 */
878 sent = pqsecure_write(conn, ptr, Min(len, 65536));
879#endif
880
881 if (sent < 0)
882 {
883 /* Anything except EAGAIN/EWOULDBLOCK/EINTR is trouble */
884 switch (SOCK_ERRNO)
885 {
886#ifdef EAGAIN
887 case EAGAIN:
888 break;
889#endif
890#if defined(EWOULDBLOCK) && (!defined(EAGAIN) || (EWOULDBLOCK != EAGAIN))
891 case EWOULDBLOCK:
892 break;
893#endif
894 case EINTR:
895 continue;
896
897 default:
898 /* Discard queued data; no chance it'll ever be sent */
899 conn->outCount = 0;
900
901 /* Absorb input data if any, and detect socket closure */
902 if (conn->sock != PGINVALID_SOCKET)
903 {
904 if (pqReadData(conn) < 0)
905 return -1;
906 }
907
908 /*
909 * Lower-level code should already have filled
910 * conn->write_err_msg (and set conn->write_failed) or
911 * conn->errorMessage. In the former case, we pretend
912 * there's no problem; the write_failed condition will be
913 * dealt with later. Otherwise, report the error now.
914 */
915 if (conn->write_failed)
916 return 0;
917 else
918 return -1;
919 }
920 }
921 else
922 {
923 ptr += sent;
924 len -= sent;
925 remaining -= sent;
926 }
927
928 if (len > 0)
929 {
930 /*
931 * We didn't send it all, wait till we can send more.
932 *
933 * There are scenarios in which we can't send data because the
934 * communications channel is full, but we cannot expect the server
935 * to clear the channel eventually because it's blocked trying to
936 * send data to us. (This can happen when we are sending a large
937 * amount of COPY data, and the server has generated lots of
938 * NOTICE responses.) To avoid a deadlock situation, we must be
939 * prepared to accept and buffer incoming data before we try
940 * again. Furthermore, it is possible that such incoming data
941 * might not arrive until after we've gone to sleep. Therefore,
942 * we wait for either read ready or write ready.
943 *
944 * In non-blocking mode, we don't wait here directly, but return 1
945 * to indicate that data is still pending. The caller should wait
946 * for both read and write ready conditions, and call
947 * PQconsumeInput() on read ready, but just in case it doesn't, we
948 * call pqReadData() ourselves before returning. That's not
949 * enough if the data has not arrived yet, but it's the best we
950 * can do, and works pretty well in practice. (The documentation
951 * used to say that you only need to wait for write-ready, so
952 * there are still plenty of applications like that out there.)
953 *
954 * Note that errors here don't result in write_failed becoming
955 * set.
956 */
957 if (pqReadData(conn) < 0)
958 {
959 result = -1; /* error message already set up */
960 break;
961 }
962
963 if (pqIsnonblocking(conn))
964 {
965 result = 1;
966 break;
967 }
968
969 if (pqWait(true, true, conn))
970 {
971 result = -1;
972 break;
973 }
974 }
975 }
976
977 /* shift the remaining contents of the buffer */
978 if (remaining > 0)
979 memmove(conn->outBuffer, ptr, remaining);
980 conn->outCount = remaining;
981
982 return result;
983}
984
985
986/*
987 * pqFlush: send any data waiting in the output buffer
988 *
989 * Return 0 on success, -1 on failure and 1 when not all data could be sent
990 * because the socket would block and the connection is non-blocking.
991 * (See pqSendSome comments about how failure should be handled.)
992 */
993int
994 pqFlush(PGconn *conn)
995{
996 if (conn->outCount > 0)
997 {
998 if (conn->Pfdebug)
999 fflush(conn->Pfdebug);
1000
1001 return pqSendSome(conn, conn->outCount);
1002 }
1003
1004 return 0;
1005}
1006
1007
1008/*
1009 * pqWait: wait until we can read or write the connection socket
1010 *
1011 * JAB: If SSL enabled and used and forRead, buffered bytes short-circuit the
1012 * call to select().
1013 *
1014 * We also stop waiting and return if the kernel flags an exception condition
1015 * on the socket. The actual error condition will be detected and reported
1016 * when the caller tries to read or write the socket.
1017 */
1018int
1019 pqWait(int forRead, int forWrite, PGconn *conn)
1020{
1021 return pqWaitTimed(forRead, forWrite, conn, -1);
1022}
1023
1024/*
1025 * pqWaitTimed: wait, but not past end_time.
1026 *
1027 * Returns -1 on failure, 0 if the socket is readable/writable, 1 if it timed out.
1028 *
1029 * The timeout is specified by end_time, which is the int64 number of
1030 * microseconds since the Unix epoch (that is, time_t times 1 million).
1031 * Timeout is infinite if end_time is -1. Timeout is immediate (no blocking)
1032 * if end_time is 0 (or indeed, any time before now).
1033 */
1034int
1035 pqWaitTimed(int forRead, int forWrite, PGconn *conn, pg_usec_time_t end_time)
1036{
1037 int result;
1038
1039 result = pqSocketCheck(conn, forRead, forWrite, end_time);
1040
1041 if (result < 0)
1042 return -1; /* errorMessage is already set */
1043
1044 if (result == 0)
1045 {
1046 libpq_append_conn_error(conn, "timeout expired");
1047 return 1;
1048 }
1049
1050 return 0;
1051}
1052
1053/*
1054 * pqReadReady: is select() saying the file is ready to read?
1055 * Returns -1 on failure, 0 if not ready, 1 if ready.
1056 */
1057int
1058 pqReadReady(PGconn *conn)
1059{
1060 return pqSocketCheck(conn, 1, 0, 0);
1061}
1062
1063/*
1064 * pqWriteReady: is select() saying the file is ready to write?
1065 * Returns -1 on failure, 0 if not ready, 1 if ready.
1066 */
1067int
1068 pqWriteReady(PGconn *conn)
1069{
1070 return pqSocketCheck(conn, 0, 1, 0);
1071}
1072
1073/*
1074 * Checks a socket, using poll or select, for data to be read, written,
1075 * or both. Returns >0 if one or more conditions are met, 0 if it timed
1076 * out, -1 if an error occurred.
1077 *
1078 * If an altsock is set for asynchronous authentication, that will be used in
1079 * preference to the "server" socket. Otherwise, if SSL is in use, the SSL
1080 * buffer is checked prior to checking the socket for read data directly.
1081 */
1082static int
1083 pqSocketCheck(PGconn *conn, int forRead, int forWrite, pg_usec_time_t end_time)
1084{
1085 int result;
1086 pgsocket sock;
1087
1088 if (!conn)
1089 return -1;
1090
1091 if (conn->altsock != PGINVALID_SOCKET)
1092 sock = conn->altsock;
1093 else
1094 {
1095 sock = conn->sock;
1096 if (sock == PGINVALID_SOCKET)
1097 {
1098 libpq_append_conn_error(conn, "invalid socket");
1099 return -1;
1100 }
1101
1102#ifdef USE_SSL
1103 /* Check for SSL library buffering read bytes */
1104 if (forRead && conn->ssl_in_use && pgtls_read_pending(conn))
1105 {
1106 /* short-circuit the select */
1107 return 1;
1108 }
1109#endif
1110 }
1111
1112 /* We will retry as long as we get EINTR */
1113 do
1114 result = PQsocketPoll(sock, forRead, forWrite, end_time);
1115 while (result < 0 && SOCK_ERRNO == EINTR);
1116
1117 if (result < 0)
1118 {
1119 char sebuf[PG_STRERROR_R_BUFLEN];
1120
1121 libpq_append_conn_error(conn, "%s() failed: %s", "select",
1122 SOCK_STRERROR(SOCK_ERRNO, sebuf, sizeof(sebuf)));
1123 }
1124
1125 return result;
1126}
1127
1128
1129/*
1130 * Check a file descriptor for read and/or write data, possibly waiting.
1131 * If neither forRead nor forWrite are set, immediately return a timeout
1132 * condition (without waiting). Return >0 if condition is met, 0
1133 * if a timeout occurred, -1 if an error or interrupt occurred.
1134 *
1135 * The timeout is specified by end_time, which is the int64 number of
1136 * microseconds since the Unix epoch (that is, time_t times 1 million).
1137 * Timeout is infinite if end_time is -1. Timeout is immediate (no blocking)
1138 * if end_time is 0 (or indeed, any time before now).
1139 */
1140int
1141 PQsocketPoll(int sock, int forRead, int forWrite, pg_usec_time_t end_time)
1142{
1143 /* We use poll(2) if available, otherwise select(2) */
1144#ifdef HAVE_POLL
1145 struct pollfd input_fd;
1146 int timeout_ms;
1147
1148 if (!forRead && !forWrite)
1149 return 0;
1150
1151 input_fd.fd = sock;
1152 input_fd.events = POLLERR;
1153 input_fd.revents = 0;
1154
1155 if (forRead)
1156 input_fd.events |= POLLIN;
1157 if (forWrite)
1158 input_fd.events |= POLLOUT;
1159
1160 /* Compute appropriate timeout interval */
1161 if (end_time == -1)
1162 timeout_ms = -1;
1163 else if (end_time == 0)
1164 timeout_ms = 0;
1165 else
1166 {
1167 pg_usec_time_t now = PQgetCurrentTimeUSec();
1168
1169 if (end_time > now)
1170 timeout_ms = (end_time - now) / 1000;
1171 else
1172 timeout_ms = 0;
1173 }
1174
1175 return poll(&input_fd, 1, timeout_ms);
1176#else /* !HAVE_POLL */
1177
1178 fd_set input_mask;
1179 fd_set output_mask;
1180 fd_set except_mask;
1181 struct timeval timeout;
1182 struct timeval *ptr_timeout;
1183
1184 if (!forRead && !forWrite)
1185 return 0;
1186
1187 FD_ZERO(&input_mask);
1188 FD_ZERO(&output_mask);
1189 FD_ZERO(&except_mask);
1190 if (forRead)
1191 FD_SET(sock, &input_mask);
1192
1193 if (forWrite)
1194 FD_SET(sock, &output_mask);
1195 FD_SET(sock, &except_mask);
1196
1197 /* Compute appropriate timeout interval */
1198 if (end_time == -1)
1199 ptr_timeout = NULL;
1200 else if (end_time == 0)
1201 {
1202 timeout.tv_sec = 0;
1203 timeout.tv_usec = 0;
1204 ptr_timeout = &timeout;
1205 }
1206 else
1207 {
1208 pg_usec_time_t now = PQgetCurrentTimeUSec();
1209
1210 if (end_time > now)
1211 {
1212 timeout.tv_sec = (end_time - now) / 1000000;
1213 timeout.tv_usec = (end_time - now) % 1000000;
1214 }
1215 else
1216 {
1217 timeout.tv_sec = 0;
1218 timeout.tv_usec = 0;
1219 }
1220 ptr_timeout = &timeout;
1221 }
1222
1223 return select(sock + 1, &input_mask, &output_mask,
1224 &except_mask, ptr_timeout);
1225#endif /* HAVE_POLL */
1226}
1227
1228/*
1229 * PQgetCurrentTimeUSec: get current time with microsecond precision
1230 *
1231 * This provides a platform-independent way of producing a reference
1232 * value for PQsocketPoll's timeout parameter.
1233 */
1234pg_usec_time_t
1235 PQgetCurrentTimeUSec(void)
1236{
1237 struct timeval tval;
1238
1239 gettimeofday(&tval, NULL);
1240 return (pg_usec_time_t) tval.tv_sec * 1000000 + tval.tv_usec;
1241}
1242
1243
1244/*
1245 * A couple of "miscellaneous" multibyte related functions. They used
1246 * to be in fe-print.c but that file is doomed.
1247 */
1248
1249/*
1250 * Like pg_encoding_mblen(). Use this in callers that want the
1251 * dynamically-linked libpq's stance on encodings, even if that means
1252 * different behavior in different startups of the executable.
1253 */
1254int
1255 PQmblen(const char *s, int encoding)
1256{
1257 return pg_encoding_mblen(encoding, s);
1258}
1259
1260/*
1261 * Like pg_encoding_mblen_bounded(). Use this in callers that want the
1262 * dynamically-linked libpq's stance on encodings, even if that means
1263 * different behavior in different startups of the executable.
1264 */
1265int
1266 PQmblenBounded(const char *s, int encoding)
1267{
1268 return strnlen(s, pg_encoding_mblen(encoding, s));
1269}
1270
1271/*
1272 * Returns the display length of the character beginning at s, using the
1273 * specified encoding.
1274 */
1275int
1276 PQdsplen(const char *s, int encoding)
1277{
1278 return pg_encoding_dsplen(encoding, s);
1279}
1280
1281/*
1282 * Get encoding id from environment variable PGCLIENTENCODING.
1283 */
1284int
1285 PQenv2encoding(void)
1286{
1287 char *str;
1288 int encoding = PG_SQL_ASCII;
1289
1290 str = getenv("PGCLIENTENCODING");
1291 if (str && *str != '0円')
1292 {
1293 encoding = pg_char_to_encoding(str);
1294 if (encoding < 0)
1295 encoding = PG_SQL_ASCII;
1296 }
1297 return encoding;
1298}
1299
1300
1301#ifdef ENABLE_NLS
1302
1303static void
1304libpq_binddomain(void)
1305{
1306 /*
1307 * At least on Windows, there are gettext implementations that fail if
1308 * multiple threads call bindtextdomain() concurrently. Use a mutex and
1309 * flag variable to ensure that we call it just once per process. It is
1310 * not known that similar bugs exist on non-Windows platforms, but we
1311 * might as well do it the same way everywhere.
1312 */
1313 static volatile bool already_bound = false;
1314 static pthread_mutex_t binddomain_mutex = PTHREAD_MUTEX_INITIALIZER;
1315
1316 if (!already_bound)
1317 {
1318 /* bindtextdomain() does not preserve errno */
1319#ifdef WIN32
1320 int save_errno = GetLastError();
1321#else
1322 int save_errno = errno;
1323#endif
1324
1325 (void) pthread_mutex_lock(&binddomain_mutex);
1326
1327 if (!already_bound)
1328 {
1329 const char *ldir;
1330
1331 /*
1332 * No relocatable lookup here because the calling executable could
1333 * be anywhere
1334 */
1335 ldir = getenv("PGLOCALEDIR");
1336 if (!ldir)
1337 ldir = LOCALEDIR;
1338 bindtextdomain(PG_TEXTDOMAIN("libpq"), ldir);
1339 already_bound = true;
1340 }
1341
1342 (void) pthread_mutex_unlock(&binddomain_mutex);
1343
1344#ifdef WIN32
1345 SetLastError(save_errno);
1346#else
1347 errno = save_errno;
1348#endif
1349 }
1350}
1351
1352char *
1353libpq_gettext(const char *msgid)
1354{
1355 libpq_binddomain();
1356 return dgettext(PG_TEXTDOMAIN("libpq"), msgid);
1357}
1358
1359char *
1360libpq_ngettext(const char *msgid, const char *msgid_plural, unsigned long n)
1361{
1362 libpq_binddomain();
1363 return dngettext(PG_TEXTDOMAIN("libpq"), msgid, msgid_plural, n);
1364}
1365
1366#endif /* ENABLE_NLS */
1367
1368
1369/*
1370 * Append a formatted string to the given buffer, after translating it. A
1371 * newline is automatically appended; the format should not end with a
1372 * newline.
1373 */
1374void
1375 libpq_append_error(PQExpBuffer errorMessage, const char *fmt,...)
1376{
1377 int save_errno = errno;
1378 bool done;
1379 va_list args;
1380
1381 Assert(fmt[strlen(fmt) - 1] != '\n');
1382
1383 if (PQExpBufferBroken(errorMessage))
1384 return; /* already failed */
1385
1386 /* Loop in case we have to retry after enlarging the buffer. */
1387 do
1388 {
1389 errno = save_errno;
1390 va_start(args, fmt);
1391 done = appendPQExpBufferVA(errorMessage, libpq_gettext(fmt), args);
1392 va_end(args);
1393 } while (!done);
1394
1395 appendPQExpBufferChar(errorMessage, '\n');
1396}
1397
1398/*
1399 * Append a formatted string to the error message buffer of the given
1400 * connection, after translating it. A newline is automatically appended; the
1401 * format should not end with a newline.
1402 */
1403void
1404 libpq_append_conn_error(PGconn *conn, const char *fmt,...)
1405{
1406 int save_errno = errno;
1407 bool done;
1408 va_list args;
1409
1410 Assert(fmt[strlen(fmt) - 1] != '\n');
1411
1412 if (PQExpBufferBroken(&conn->errorMessage))
1413 return; /* already failed */
1414
1415 /* Loop in case we have to retry after enlarging the buffer. */
1416 do
1417 {
1418 errno = save_errno;
1419 va_start(args, fmt);
1420 done = appendPQExpBufferVA(&conn->errorMessage, libpq_gettext(fmt), args);
1421 va_end(args);
1422 } while (!done);
1423
1424 appendPQExpBufferChar(&conn->errorMessage, '\n');
1425}
Datum now(PG_FUNCTION_ARGS)
Definition: timestamp.c:1609
#define Min(x, y)
Definition: c.h:1003
#define PG_TEXTDOMAIN(domain)
Definition: c.h:1213
#define dngettext(d, s, p, n)
Definition: c.h:1181
uint16_t uint16
Definition: c.h:537
uint32_t uint32
Definition: c.h:538
#define dgettext(d, x)
Definition: c.h:1179
void pqDropConnection(PGconn *conn, bool flushInput)
Definition: fe-connect.c:530
void pqInternalNotice(const PGNoticeHooks *hooks, const char *fmt,...)
Definition: fe-exec.c:938
int pqPutc(char c, PGconn *conn)
Definition: fe-misc.c:92
int pqReadData(PGconn *conn)
Definition: fe-misc.c:606
int pqPutInt(int value, size_t bytes, PGconn *conn)
Definition: fe-misc.c:253
int pqCheckOutBufferSpace(size_t bytes_needed, PGconn *conn)
Definition: fe-misc.c:287
int pqFlush(PGconn *conn)
Definition: fe-misc.c:994
void pqParseDone(PGconn *conn, int newInStart)
Definition: fe-misc.c:443
int pqReadReady(PGconn *conn)
Definition: fe-misc.c:1058
static int pqSocketCheck(PGconn *conn, int forRead, int forWrite, pg_usec_time_t end_time)
Definition: fe-misc.c:1083
int PQenv2encoding(void)
Definition: fe-misc.c:1285
int pqPutMsgStart(char msg_type, PGconn *conn)
Definition: fe-misc.c:473
int pqSkipnchar(size_t len, PGconn *conn)
Definition: fe-misc.c:187
int PQsocketPoll(int sock, int forRead, int forWrite, pg_usec_time_t end_time)
Definition: fe-misc.c:1141
int pqGetc(char *result, PGconn *conn)
Definition: fe-misc.c:77
int PQlibVersion(void)
Definition: fe-misc.c:63
int pqGetInt(int *result, size_t bytes, PGconn *conn)
Definition: fe-misc.c:216
int PQmblen(const char *s, int encoding)
Definition: fe-misc.c:1255
int pqWait(int forRead, int forWrite, PGconn *conn)
Definition: fe-misc.c:1019
int pqGets(PQExpBuffer buf, PGconn *conn)
Definition: fe-misc.c:136
int pqPutnchar(const void *s, size_t len, PGconn *conn)
Definition: fe-misc.c:202
int PQdsplen(const char *s, int encoding)
Definition: fe-misc.c:1276
int pqCheckInBufferSpace(size_t bytes_needed, PGconn *conn)
Definition: fe-misc.c:351
static int pqPutMsgBytes(const void *buf, size_t len, PGconn *conn)
Definition: fe-misc.c:509
static int pqSendSome(PGconn *conn, int len)
Definition: fe-misc.c:825
pg_usec_time_t PQgetCurrentTimeUSec(void)
Definition: fe-misc.c:1235
static int pqGets_internal(PQExpBuffer buf, PGconn *conn, bool resetbuffer)
Definition: fe-misc.c:109
int pqPuts(const char *s, PGconn *conn)
Definition: fe-misc.c:152
void libpq_append_error(PQExpBuffer errorMessage, const char *fmt,...)
Definition: fe-misc.c:1375
int pqGetnchar(void *s, size_t len, PGconn *conn)
Definition: fe-misc.c:165
int PQmblenBounded(const char *s, int encoding)
Definition: fe-misc.c:1266
void libpq_append_conn_error(PGconn *conn, const char *fmt,...)
Definition: fe-misc.c:1404
int pqWaitTimed(int forRead, int forWrite, PGconn *conn, pg_usec_time_t end_time)
Definition: fe-misc.c:1035
int pqGets_append(PQExpBuffer buf, PGconn *conn)
Definition: fe-misc.c:142
int pqWriteReady(PGconn *conn)
Definition: fe-misc.c:1068
int pqPutMsgEnd(PGconn *conn)
Definition: fe-misc.c:532
bool pgtls_read_pending(PGconn *conn)
ssize_t pqsecure_write(PGconn *conn, const void *ptr, size_t len)
Definition: fe-secure.c:267
ssize_t pqsecure_read(PGconn *conn, void *ptr, size_t len)
Definition: fe-secure.c:167
void pqTraceOutputMessage(PGconn *conn, const char *message, bool toServer)
Definition: fe-trace.c:624
void pqTraceOutputNoTypeByteMessage(PGconn *conn, const char *message)
Definition: fe-trace.c:841
Assert(PointerIsAligned(start, uint64))
const char * str
#define realloc(a, b)
Definition: header.h:60
static struct @169 value
int remaining
Definition: informix.c:692
@ CONNECTION_BAD
Definition: libpq-fe.h:85
int64_t pg_usec_time_t
Definition: libpq-fe.h:238
#define SOCK_STRERROR
Definition: libpq-int.h:963
#define libpq_ngettext(s, p, n)
Definition: libpq-int.h:942
#define pqIsnonblocking(conn)
Definition: libpq-int.h:930
args
#define SOCK_ERRNO
Definition: oauth-utils.c:164
#define libpq_gettext(x)
Definition: oauth-utils.h:86
#define pg_ntoh32(x)
Definition: pg_bswap.h:125
#define pg_hton32(x)
Definition: pg_bswap.h:121
#define pg_hton16(x)
Definition: pg_bswap.h:120
#define pg_ntoh16(x)
Definition: pg_bswap.h:124
const void size_t len
int32 encoding
Definition: pg_database.h:41
static char * buf
Definition: pg_test_fsync.c:72
@ PG_SQL_ASCII
Definition: pg_wchar.h:226
#define pg_char_to_encoding
Definition: pg_wchar.h:629
static int64 end_time
Definition: pgbench.c:176
#define PG_STRERROR_R_BUFLEN
Definition: port.h:257
#define ALL_CONNECTION_FAILURE_ERRNOS
Definition: port.h:122
int pgsocket
Definition: port.h:29
#define PGINVALID_SOCKET
Definition: port.h:31
size_t strnlen(const char *str, size_t maxlen)
Definition: strnlen.c:26
void resetPQExpBuffer(PQExpBuffer str)
Definition: pqexpbuffer.c:146
void appendBinaryPQExpBuffer(PQExpBuffer str, const char *data, size_t datalen)
Definition: pqexpbuffer.c:397
bool appendPQExpBufferVA(PQExpBuffer str, const char *fmt, va_list args)
Definition: pqexpbuffer.c:294
void appendPQExpBufferChar(PQExpBuffer str, char ch)
Definition: pqexpbuffer.c:378
void appendPQExpBufferStr(PQExpBuffer str, const char *data)
Definition: pqexpbuffer.c:367
#define PQExpBufferBroken(str)
Definition: pqexpbuffer.h:59
c
char * c
Definition: preproc-cursor.c:31
int pthread_mutex_unlock(pthread_mutex_t *mp)
Definition: pthread-win32.c:60
int pthread_mutex_lock(pthread_mutex_t *mp)
Definition: pthread-win32.c:42
#define PTHREAD_MUTEX_INITIALIZER
Definition: pthread-win32.h:16
PGconn * conn
Definition: streamutil.c:52
struct sockaddr_storage addr
Definition: pqcomm.h:32
Definition: libpq-int.h:372
char * write_err_msg
Definition: libpq-int.h:513
pgsocket sock
Definition: libpq-int.h:499
char * inBuffer
Definition: libpq-int.h:567
bool write_failed
Definition: libpq-int.h:512
int inCursor
Definition: libpq-int.h:570
int inEnd
Definition: libpq-int.h:571
int inBufSize
Definition: libpq-int.h:568
int inStart
Definition: libpq-int.h:569
PQExpBufferData errorMessage
Definition: libpq-int.h:674
pgsocket altsock
Definition: libpq-int.h:530
int outBufSize
Definition: libpq-int.h:575
PGNoticeHooks noticeHooks
Definition: libpq-int.h:454
FILE * Pfdebug
Definition: libpq-int.h:450
int outMsgStart
Definition: libpq-int.h:579
SockAddr raddr
Definition: libpq-int.h:502
int outCount
Definition: libpq-int.h:576
int outMsgEnd
Definition: libpq-int.h:581
bool ssl_in_use
Definition: libpq-int.h:611
char * outBuffer
Definition: libpq-int.h:574
ConnStatusType status
Definition: libpq-int.h:462
Definition: pthread-win32.h:10
int pg_encoding_dsplen(int encoding, const char *mbstr)
Definition: wchar.c:2176
int pg_encoding_mblen(int encoding, const char *mbstr)
Definition: wchar.c:2135
#define EINTR
Definition: win32_port.h:364
#define EWOULDBLOCK
Definition: win32_port.h:370
#define EAGAIN
Definition: win32_port.h:362
#define select(n, r, w, e, timeout)
Definition: win32_port.h:503
int gettimeofday(struct timeval *tp, void *tzp)

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