PostgreSQL Source Code git master
Functions
fe-misc.c File Reference
#include "postgres_fe.h"
#include <signal.h>
#include <time.h>
#include <unistd.h>
#include <sys/select.h>
#include <poll.h>
#include "libpq-fe.h"
#include "libpq-int.h"
#include "mb/pg_wchar.h"
#include "pg_config_paths.h"
#include "port/pg_bswap.h"
Include dependency graph for fe-misc.c:

Go to the source code of this file.

Functions

static int  pqPutMsgBytes (const void *buf, size_t len, PGconn *conn)
 
static int  pqSendSome (PGconn *conn, int len)
 
static int  pqSocketCheck (PGconn *conn, int forRead, int forWrite, pg_usec_time_t end_time)
 
int  PQlibVersion (void)
 
int  pqGetc (char *result, PGconn *conn)
 
int  pqPutc (char c, PGconn *conn)
 
static int  pqGets_internal (PQExpBuffer buf, PGconn *conn, bool resetbuffer)
 
int  pqGets (PQExpBuffer buf, PGconn *conn)
 
int  pqGets_append (PQExpBuffer buf, PGconn *conn)
 
int  pqPuts (const char *s, PGconn *conn)
 
int  pqGetnchar (void *s, size_t len, PGconn *conn)
 
int  pqSkipnchar (size_t len, PGconn *conn)
 
int  pqPutnchar (const void *s, size_t len, PGconn *conn)
 
int  pqGetInt (int *result, size_t bytes, PGconn *conn)
 
int  pqPutInt (int value, size_t bytes, PGconn *conn)
 
int  pqCheckOutBufferSpace (size_t bytes_needed, PGconn *conn)
 
int  pqCheckInBufferSpace (size_t bytes_needed, PGconn *conn)
 
void  pqParseDone (PGconn *conn, int newInStart)
 
int  pqPutMsgStart (char msg_type, PGconn *conn)
 
int  pqPutMsgEnd (PGconn *conn)
 
int  pqReadData (PGconn *conn)
 
int  pqFlush (PGconn *conn)
 
int  pqWait (int forRead, int forWrite, PGconn *conn)
 
int  pqWaitTimed (int forRead, int forWrite, PGconn *conn, pg_usec_time_t end_time)
 
int  pqReadReady (PGconn *conn)
 
int  pqWriteReady (PGconn *conn)
 
int  PQsocketPoll (int sock, int forRead, int forWrite, pg_usec_time_t end_time)
 
pg_usec_time_t  PQgetCurrentTimeUSec (void)
 
int  PQmblen (const char *s, int encoding)
 
int  PQmblenBounded (const char *s, int encoding)
 
int  PQdsplen (const char *s, int encoding)
 
int  PQenv2encoding (void)
 
void  libpq_append_error (PQExpBuffer errorMessage, const char *fmt,...)
 
void  libpq_append_conn_error (PGconn *conn, const char *fmt,...)
 

Function Documentation

◆ libpq_append_conn_error()

void libpq_append_conn_error ( PGconn *  conn,
const char *  fmt,
  ... 
)

Definition at line 1404 of file fe-misc.c.

1405{
1406 int save_errno = errno;
1407 bool done;
1408 va_list args;
1409
1410 Assert(fmt[strlen(fmt) - 1] != '\n');
1411
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);
1421 va_end(args);
1422 } while (!done);
1423
1425}
Assert(PointerIsAligned(start, uint64))
args
#define libpq_gettext(x)
Definition: oauth-utils.h:86
bool appendPQExpBufferVA(PQExpBuffer str, const char *fmt, va_list args)
Definition: pqexpbuffer.c:294
void appendPQExpBufferChar(PQExpBuffer str, char ch)
Definition: pqexpbuffer.c:378
#define PQExpBufferBroken(str)
Definition: pqexpbuffer.h:59
PGconn * conn
Definition: streamutil.c:52
PQExpBufferData errorMessage
Definition: libpq-int.h:674

References appendPQExpBufferChar(), appendPQExpBufferVA(), generate_unaccent_rules::args, Assert(), conn, pg_conn::errorMessage, libpq_gettext, and PQExpBufferBroken.

Referenced by pqReadData(), pqSocketCheck(), and pqWaitTimed().

◆ libpq_append_error()

void libpq_append_error ( PQExpBuffer  errorMessage,
const char *  fmt,
  ... 
)

Definition at line 1375 of file fe-misc.c.

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}

References appendPQExpBufferChar(), appendPQExpBufferVA(), generate_unaccent_rules::args, Assert(), libpq_gettext, and PQExpBufferBroken.

Referenced by conninfo_add_defaults(), conninfo_array_parse(), conninfo_init(), conninfo_parse(), conninfo_storeval(), conninfo_uri_decode(), conninfo_uri_parse_options(), conninfo_uri_parse_params(), parseServiceFile(), parseServiceInfo(), pg_fe_getusername(), and read_attr_value().

◆ pqCheckInBufferSpace()

int pqCheckInBufferSpace ( size_t  bytes_needed,
PGconn *  conn 
)

Definition at line 351 of file fe-misc.c.

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;
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 */
434 "cannot allocate memory for input buffer\n");
435 return EOF;
436}
#define realloc(a, b)
Definition: header.h:60
void appendPQExpBufferStr(PQExpBuffer str, const char *data)
Definition: pqexpbuffer.c:367
char * inBuffer
Definition: libpq-int.h:567
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

References appendPQExpBufferStr(), conn, pg_conn::errorMessage, pg_conn::inBuffer, pg_conn::inBufSize, pg_conn::inCursor, pg_conn::inEnd, pg_conn::inStart, and realloc.

Referenced by getCopyDataMessage(), PQconnectPoll(), pqFunctionCall3(), pqParseInput3(), and pqReadData().

◆ pqCheckOutBufferSpace()

int pqCheckOutBufferSpace ( size_t  bytes_needed,
PGconn *  conn 
)

Definition at line 287 of file fe-misc.c.

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 */
340 "cannot allocate memory for output buffer\n");
341 return EOF;
342}
int outBufSize
Definition: libpq-int.h:575
char * outBuffer
Definition: libpq-int.h:574

References appendPQExpBufferStr(), conn, pg_conn::errorMessage, pg_conn::outBuffer, pg_conn::outBufSize, and realloc.

Referenced by PQputCopyData(), pqPutMsgBytes(), and pqPutMsgStart().

◆ PQdsplen()

int PQdsplen ( const char *  s,
int  encoding 
)

Definition at line 1276 of file fe-misc.c.

1277{
1278 return pg_encoding_dsplen(encoding, s);
1279}
int32 encoding
Definition: pg_database.h:41
int pg_encoding_dsplen(int encoding, const char *mbstr)
Definition: wchar.c:2176

References encoding, and pg_encoding_dsplen().

Referenced by get_prompt(), pg_wcsformat(), pg_wcssize(), pg_wcswidth(), and strlen_max_width().

◆ PQenv2encoding()

int PQenv2encoding ( void  )

Definition at line 1285 of file fe-misc.c.

1286{
1287 char *str;
1288 int encoding = PG_SQL_ASCII;
1289
1290 str = getenv("PGCLIENTENCODING");
1291 if (str && *str != '0円')
1292 {
1294 if (encoding < 0)
1296 }
1297 return encoding;
1298}
const char * str
@ PG_SQL_ASCII
Definition: pg_wchar.h:226
#define pg_char_to_encoding
Definition: pg_wchar.h:629

References encoding, pg_char_to_encoding, PG_SQL_ASCII, and str.

Referenced by main().

◆ pqFlush()

int pqFlush ( PGconn *  conn )

Definition at line 994 of file fe-misc.c.

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}
static int pqSendSome(PGconn *conn, int len)
Definition: fe-misc.c:825
FILE * Pfdebug
Definition: libpq-int.h:450
int outCount
Definition: libpq-int.h:576

References conn, pg_conn::outCount, pg_conn::Pfdebug, and pqSendSome().

Referenced by pg_SASL_init(), PQconnectPoll(), PQconsumeInput(), pqEndcopy3(), PQexitPipelineMode(), PQflush(), pqFunctionCall3(), PQgetResult(), pqPacketSend(), pqPipelineFlush(), pqPipelineSyncInternal(), PQputCopyData(), PQputCopyEnd(), PQsendCancelRequest(), PQsendQueryInternal(), PQsetnonblocking(), and sendTerminateConn().

◆ pqGetc()

int pqGetc ( char *  result,
PGconn *  conn 
)

Definition at line 77 of file fe-misc.c.

78{
79 if (conn->inCursor >= conn->inEnd)
80 return EOF;
81
82 *result = conn->inBuffer[conn->inCursor++];
83
84 return 0;
85}

References conn, pg_conn::inBuffer, pg_conn::inCursor, and pg_conn::inEnd.

Referenced by getCopyDataMessage(), getCopyStart(), getReadyForQuery(), PQconnectPoll(), pqFunctionCall3(), pqGetErrorNotice3(), and pqParseInput3().

◆ PQgetCurrentTimeUSec()

pg_usec_time_t PQgetCurrentTimeUSec ( void  )

Definition at line 1235 of file fe-misc.c.

1236{
1237 struct timeval tval;
1238
1239 gettimeofday(&tval, NULL);
1240 return (pg_usec_time_t) tval.tv_sec * 1000000 + tval.tv_usec;
1241}
int64_t pg_usec_time_t
Definition: libpq-fe.h:238
int gettimeofday(struct timeval *tp, void *tzp)

References gettimeofday().

Referenced by pqConnectDBComplete(), PQsocketPoll(), and wait_until_connected().

◆ pqGetInt()

int pqGetInt ( int *  result,
size_t  bytes,
PGconn *  conn 
)

Definition at line 216 of file fe-misc.c.

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:
239 "integer of size %lu not supported by pqGetInt",
240 (unsigned long) bytes);
241 return EOF;
242 }
243
244 return 0;
245}
uint16_t uint16
Definition: c.h:537
uint32_t uint32
Definition: c.h:538
void pqInternalNotice(const PGNoticeHooks *hooks, const char *fmt,...)
Definition: fe-exec.c:938
#define pg_ntoh32(x)
Definition: pg_bswap.h:125
#define pg_ntoh16(x)
Definition: pg_bswap.h:124
PGNoticeHooks noticeHooks
Definition: libpq-int.h:454

References conn, pg_conn::inBuffer, pg_conn::inCursor, pg_conn::inEnd, pg_conn::noticeHooks, pg_ntoh16, pg_ntoh32, and pqInternalNotice().

Referenced by getAnotherTuple(), getBackendKeyData(), getCopyDataMessage(), getCopyStart(), getNotify(), getParamDescriptions(), getRowDescriptions(), PQconnectPoll(), pqFunctionCall3(), pqGetNegotiateProtocolVersion3(), and pqParseInput3().

◆ pqGetnchar()

int pqGetnchar ( void *  s,
size_t  len,
PGconn *  conn 
)

Definition at line 165 of file fe-misc.c.

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}
const void size_t len

References conn, pg_conn::inBuffer, pg_conn::inCursor, pg_conn::inEnd, and len.

Referenced by getBackendKeyData(), pg_password_sendauth(), pg_SASL_continue(), and pqFunctionCall3().

◆ pqGets()

int pqGets ( PQExpBuffer  buf,
PGconn *  conn 
)

Definition at line 136 of file fe-misc.c.

137{
138 return pqGets_internal(buf, conn, true);
139}
static int pqGets_internal(PQExpBuffer buf, PGconn *conn, bool resetbuffer)
Definition: fe-misc.c:109
static char * buf
Definition: pg_test_fsync.c:72

References buf, conn, and pqGets_internal().

Referenced by getNotify(), getParameterStatus(), getRowDescriptions(), pg_SASL_init(), pqGetErrorNotice3(), pqGetNegotiateProtocolVersion3(), and pqParseInput3().

◆ pqGets_append()

int pqGets_append ( PQExpBuffer  buf,
PGconn *  conn 
)

Definition at line 142 of file fe-misc.c.

143{
144 return pqGets_internal(buf, conn, false);
145}

References buf, conn, and pqGets_internal().

Referenced by PQconnectPoll().

◆ pqGets_internal()

static int pqGets_internal ( PQExpBuffer  buf,
PGconn *  conn,
bool  resetbuffer 
)
static

Definition at line 109 of file fe-misc.c.

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)
127
128 appendBinaryPQExpBuffer(buf, inBuffer + conn->inCursor, slen);
129
130 conn->inCursor = ++inCursor;
131
132 return 0;
133}
void resetPQExpBuffer(PQExpBuffer str)
Definition: pqexpbuffer.c:146
void appendBinaryPQExpBuffer(PQExpBuffer str, const char *data, size_t datalen)
Definition: pqexpbuffer.c:397

References appendBinaryPQExpBuffer(), buf, conn, pg_conn::inBuffer, pg_conn::inCursor, pg_conn::inEnd, and resetPQExpBuffer().

Referenced by pqGets(), and pqGets_append().

◆ PQlibVersion()

int PQlibVersion ( void  )

Definition at line 63 of file fe-misc.c.

64{
65 return PG_VERSION_NUM;
66}

◆ PQmblen()

int PQmblen ( const char *  s,
int  encoding 
)

Definition at line 1255 of file fe-misc.c.

1256{
1257 return pg_encoding_mblen(encoding, s);
1258}
int pg_encoding_mblen(int encoding, const char *mbstr)
Definition: wchar.c:2135

References encoding, and pg_encoding_mblen().

Referenced by appendStringLiteral(), get_prompt(), pg_wcsformat(), pg_wcssize(), pg_wcswidth(), psqlscan_prepare_buffer(), and strlen_max_width().

◆ PQmblenBounded()

int PQmblenBounded ( const char *  s,
int  encoding 
)

Definition at line 1266 of file fe-misc.c.

1267{
1268 return strnlen(s, pg_encoding_mblen(encoding, s));
1269}
size_t strnlen(const char *str, size_t maxlen)
Definition: strnlen.c:26

References encoding, pg_encoding_mblen(), and strnlen().

Referenced by command_no_begin(), dequote_downcase_identifier(), do_field(), patternToSQLRegex(), quote_if_needed(), reportErrorPosition(), skip_white_space(), splitTableColumnsSpec(), strip_quotes(), and strtokx().

◆ pqParseDone()

void pqParseDone ( PGconn *  conn,
int  newInStart 
)

Definition at line 443 of file fe-misc.c.

444{
445 /* trace server-to-client message */
446 if (conn->Pfdebug)
448
449 /* Mark message as done */
450 conn->inStart = newInStart;
451}
void pqTraceOutputMessage(PGconn *conn, const char *message, bool toServer)
Definition: fe-trace.c:624

References conn, pg_conn::inBuffer, pg_conn::inStart, pg_conn::Pfdebug, and pqTraceOutputMessage().

Referenced by getCopyDataMessage(), PQconnectPoll(), pqFunctionCall3(), pqGetCopyData3(), and pqParseInput3().

◆ pqPutc()

int pqPutc ( char  c,
PGconn *  conn 
)

Definition at line 92 of file fe-misc.c.

93{
94 if (pqPutMsgBytes(&c, 1, conn))
95 return EOF;
96
97 return 0;
98}
static int pqPutMsgBytes(const void *buf, size_t len, PGconn *conn)
Definition: fe-misc.c:509
c
char * c
Definition: preproc-cursor.c:31

References conn, and pqPutMsgBytes().

Referenced by PQsendQueryGuts(), and PQsendTypedCommand().

◆ pqPutInt()

int pqPutInt ( int  value,
size_t  bytes,
PGconn *  conn 
)

Definition at line 253 of file fe-misc.c.

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:
272 "integer of size %lu not supported by pqPutInt",
273 (unsigned long) bytes);
274 return EOF;
275 }
276
277 return 0;
278}
static struct @169 value
#define pg_hton32(x)
Definition: pg_bswap.h:121
#define pg_hton16(x)
Definition: pg_bswap.h:120

References conn, pg_conn::noticeHooks, pg_hton16, pg_hton32, pqInternalNotice(), pqPutMsgBytes(), and value.

Referenced by pg_SASL_init(), pqFunctionCall3(), PQsendPrepare(), and PQsendQueryGuts().

◆ pqPutMsgBytes()

static int pqPutMsgBytes ( const void *  buf,
size_t  len,
PGconn *  conn 
)
static

Definition at line 509 of file fe-misc.c.

510{
511 /* make sure there is room for it */
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}
int pqCheckOutBufferSpace(size_t bytes_needed, PGconn *conn)
Definition: fe-misc.c:287
int outMsgEnd
Definition: libpq-int.h:581

References buf, conn, len, pg_conn::outBuffer, pg_conn::outMsgEnd, and pqCheckOutBufferSpace().

Referenced by pqPutc(), pqPutInt(), pqPutnchar(), and pqPuts().

◆ pqPutMsgEnd()

int pqPutMsgEnd ( PGconn *  conn )

Definition at line 532 of file fe-misc.c.

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 {
548 else
551 }
552
553 /* Make message eligible to send */
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
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}
void pqTraceOutputNoTypeByteMessage(PGconn *conn, const char *message)
Definition: fe-trace.c:841
struct sockaddr_storage addr
Definition: pqcomm.h:32
int outMsgStart
Definition: libpq-int.h:579
SockAddr raddr
Definition: libpq-int.h:502
bool ssl_in_use
Definition: libpq-int.h:611

References SockAddr::addr, Assert(), conn, pg_conn::outBuffer, pg_conn::outCount, pg_conn::outMsgEnd, pg_conn::outMsgStart, pg_conn::Pfdebug, pg_hton32, pqSendSome(), pqTraceOutputMessage(), pqTraceOutputNoTypeByteMessage(), pg_conn::raddr, and pg_conn::ssl_in_use.

Referenced by pg_SASL_init(), pqEndcopy3(), pqFunctionCall3(), pqPacketSend(), pqPipelineSyncInternal(), PQputCopyData(), PQputCopyEnd(), PQsendCancelRequest(), PQsendFlushRequest(), PQsendPrepare(), PQsendQueryGuts(), PQsendQueryInternal(), PQsendTypedCommand(), and sendTerminateConn().

◆ pqPutMsgStart()

int pqPutMsgStart ( char  msg_type,
PGconn *  conn 
)

Definition at line 473 of file fe-misc.c.

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}

References conn, pg_conn::outBuffer, pg_conn::outCount, pg_conn::outMsgEnd, pg_conn::outMsgStart, and pqCheckOutBufferSpace().

Referenced by pg_SASL_init(), pqEndcopy3(), pqFunctionCall3(), pqPacketSend(), pqPipelineSyncInternal(), PQputCopyData(), PQputCopyEnd(), PQsendCancelRequest(), PQsendFlushRequest(), PQsendPrepare(), PQsendQueryGuts(), PQsendQueryInternal(), PQsendTypedCommand(), and sendTerminateConn().

◆ pqPutnchar()

int pqPutnchar ( const void *  s,
size_t  len,
PGconn *  conn 
)

Definition at line 202 of file fe-misc.c.

203{
204 if (pqPutMsgBytes(s, len, conn))
205 return EOF;
206
207 return 0;
208}

References conn, len, and pqPutMsgBytes().

Referenced by pg_SASL_init(), pqFunctionCall3(), pqPacketSend(), PQputCopyData(), PQsendCancelRequest(), and PQsendQueryGuts().

◆ pqPuts()

int pqPuts ( const char *  s,
PGconn *  conn 
)

Definition at line 152 of file fe-misc.c.

153{
154 if (pqPutMsgBytes(s, strlen(s) + 1, conn))
155 return EOF;
156
157 return 0;
158}

References conn, and pqPutMsgBytes().

Referenced by pg_SASL_init(), PQputCopyEnd(), PQsendPrepare(), PQsendQueryGuts(), PQsendQueryInternal(), and PQsendTypedCommand().

◆ pqReadData()

int pqReadData ( PGconn *  conn )

Definition at line 606 of file fe-misc.c.

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;
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:
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 */
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:
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 */
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}
void pqDropConnection(PGconn *conn, bool flushInput)
Definition: fe-connect.c:530
int pqReadReady(PGconn *conn)
Definition: fe-misc.c:1058
int pqCheckInBufferSpace(size_t bytes_needed, PGconn *conn)
Definition: fe-misc.c:351
void libpq_append_conn_error(PGconn *conn, const char *fmt,...)
Definition: fe-misc.c:1404
ssize_t pqsecure_read(PGconn *conn, void *ptr, size_t len)
Definition: fe-secure.c:167
@ CONNECTION_BAD
Definition: libpq-fe.h:85
#define SOCK_ERRNO
Definition: oauth-utils.c:164
#define ALL_CONNECTION_FAILURE_ERRNOS
Definition: port.h:122
#define PGINVALID_SOCKET
Definition: port.h:31
pgsocket sock
Definition: libpq-int.h:499
ConnStatusType status
Definition: libpq-int.h:462
#define EINTR
Definition: win32_port.h:364
#define EWOULDBLOCK
Definition: win32_port.h:370
#define EAGAIN
Definition: win32_port.h:362

References ALL_CONNECTION_FAILURE_ERRNOS, conn, CONNECTION_BAD, EAGAIN, EINTR, EWOULDBLOCK, pg_conn::inBuffer, pg_conn::inBufSize, pg_conn::inCursor, pg_conn::inEnd, pg_conn::inStart, libpq_append_conn_error(), PGINVALID_SOCKET, pqCheckInBufferSpace(), pqDropConnection(), pqReadReady(), pqsecure_read(), pg_conn::sock, SOCK_ERRNO, pg_conn::ssl_in_use, and pg_conn::status.

Referenced by PQcancelPoll(), PQconnectPoll(), PQconsumeInput(), pqFunctionCall3(), pqGetCopyData3(), pqGetline3(), PQgetResult(), and pqSendSome().

◆ pqReadReady()

int pqReadReady ( PGconn *  conn )

Definition at line 1058 of file fe-misc.c.

1059{
1060 return pqSocketCheck(conn, 1, 0, 0);
1061}
static int pqSocketCheck(PGconn *conn, int forRead, int forWrite, pg_usec_time_t end_time)
Definition: fe-misc.c:1083

References conn, and pqSocketCheck().

Referenced by gss_read(), and pqReadData().

◆ pqSendSome()

static int pqSendSome ( PGconn *  conn,
int  len 
)
static

Definition at line 825 of file fe-misc.c.

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
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);
981
982 return result;
983}
#define Min(x, y)
Definition: c.h:1003
int pqReadData(PGconn *conn)
Definition: fe-misc.c:606
int pqWait(int forRead, int forWrite, PGconn *conn)
Definition: fe-misc.c:1019
ssize_t pqsecure_write(PGconn *conn, const void *ptr, size_t len)
Definition: fe-secure.c:267
int remaining
Definition: informix.c:692
#define pqIsnonblocking(conn)
Definition: libpq-int.h:930
char * write_err_msg
Definition: libpq-int.h:513
bool write_failed
Definition: libpq-int.h:512

References conn, EAGAIN, EINTR, EWOULDBLOCK, len, libpq_gettext, Min, pg_conn::outBuffer, pg_conn::outCount, PGINVALID_SOCKET, pqIsnonblocking, pqReadData(), pqsecure_write(), pqWait(), remaining, pg_conn::sock, SOCK_ERRNO, pg_conn::write_err_msg, and pg_conn::write_failed.

Referenced by pqFlush(), and pqPutMsgEnd().

◆ pqSkipnchar()

int pqSkipnchar ( size_t  len,
PGconn *  conn 
)

Definition at line 187 of file fe-misc.c.

188{
189 if (len > (size_t) (conn->inEnd - conn->inCursor))
190 return EOF;
191
192 conn->inCursor += len;
193
194 return 0;
195}

References conn, pg_conn::inCursor, pg_conn::inEnd, and len.

Referenced by getAnotherTuple().

◆ pqSocketCheck()

static int pqSocketCheck ( PGconn *  conn,
int  forRead,
int  forWrite,
pg_usec_time_t  end_time 
)
static

Definition at line 1083 of file fe-misc.c.

1084{
1085 int result;
1086 pgsocket sock;
1087
1088 if (!conn)
1089 return -1;
1090
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}
int PQsocketPoll(int sock, int forRead, int forWrite, pg_usec_time_t end_time)
Definition: fe-misc.c:1141
bool pgtls_read_pending(PGconn *conn)
#define SOCK_STRERROR
Definition: libpq-int.h:963
static int64 end_time
Definition: pgbench.c:176
#define PG_STRERROR_R_BUFLEN
Definition: port.h:257
int pgsocket
Definition: port.h:29
pgsocket altsock
Definition: libpq-int.h:530

References pg_conn::altsock, conn, EINTR, end_time, libpq_append_conn_error(), PG_STRERROR_R_BUFLEN, PGINVALID_SOCKET, pgtls_read_pending(), PQsocketPoll(), pg_conn::sock, SOCK_ERRNO, SOCK_STRERROR, and pg_conn::ssl_in_use.

Referenced by pqReadReady(), pqWaitTimed(), and pqWriteReady().

◆ PQsocketPoll()

int PQsocketPoll ( int  sock,
int  forRead,
int  forWrite,
pg_usec_time_t  end_time 
)

Definition at line 1141 of file fe-misc.c.

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 {
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 {
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}
Datum now(PG_FUNCTION_ARGS)
Definition: timestamp.c:1609
pg_usec_time_t PQgetCurrentTimeUSec(void)
Definition: fe-misc.c:1235
#define select(n, r, w, e, timeout)
Definition: win32_port.h:503

References end_time, now(), PQgetCurrentTimeUSec(), and select.

Referenced by pqSocketCheck(), timer_expired(), and wait_until_connected().

◆ pqWait()

int pqWait ( int  forRead,
int  forWrite,
PGconn *  conn 
)

Definition at line 1019 of file fe-misc.c.

1020{
1021 return pqWaitTimed(forRead, forWrite, conn, -1);
1022}
int pqWaitTimed(int forRead, int forWrite, PGconn *conn, pg_usec_time_t end_time)
Definition: fe-misc.c:1035

References conn, and pqWaitTimed().

Referenced by pqFunctionCall3(), pqGetCopyData3(), pqGetline3(), PQgetResult(), and pqSendSome().

◆ pqWaitTimed()

int pqWaitTimed ( int  forRead,
int  forWrite,
PGconn *  conn,
pg_usec_time_t  end_time 
)

Definition at line 1035 of file fe-misc.c.

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}

References conn, end_time, libpq_append_conn_error(), and pqSocketCheck().

Referenced by pqConnectDBComplete(), and pqWait().

◆ pqWriteReady()

int pqWriteReady ( PGconn *  conn )

Definition at line 1068 of file fe-misc.c.

1069{
1070 return pqSocketCheck(conn, 0, 1, 0);
1071}

References conn, and pqSocketCheck().

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