Header And Logo
|
#include "postgres_fe.h"#include <signal.h>#include <time.h>#include <netinet/in.h>#include <arpa/inet.h>#include <unistd.h>#include "libpq-fe.h"#include "libpq-int.h"#include "mb/pg_wchar.h"#include "pg_config_paths.h"
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, time_t end_time) |
| static int | pqSocketPoll (int sock, int forRead, int forWrite, time_t end_time) |
| int | PQlibVersion (void) |
| static void | fputnbytes (FILE *f, const char *str, size_t n) |
| 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 (char *s, size_t len, PGconn *conn) |
| int | pqSkipnchar (size_t len, PGconn *conn) |
| int | pqPutnchar (const char *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) |
| int | pqPutMsgStart (char msg_type, bool force_len, 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, time_t finish_time) |
| int | pqReadReady (PGconn *conn) |
| int | pqWriteReady (PGconn *conn) |
| int | PQmblen (const char *s, int encoding) |
| int | PQdsplen (const char *s, int encoding) |
| int | PQenv2encoding (void) |
| static void fputnbytes | ( | FILE * | f, | |
| const char * | str, | |||
| size_t | n | |||
| ) | [static] |
Definition at line 84 of file fe-misc.c.
Referenced by pqGetnchar(), pqPutnchar(), and pqSkipnchar().
{
while (n-- > 0)
fputc(*str++, f);
}
| int pqCheckInBufferSpace | ( | size_t | bytes_needed, | |
| PGconn * | conn | |||
| ) |
Definition at line 412 of file fe-misc.c.
References pg_conn::errorMessage, pg_conn::inBuffer, pg_conn::inBufSize, printfPQExpBuffer(), and realloc.
Referenced by getCopyDataMessage(), PQconnectPoll(), pqFunctionCall3(), pqParseInput3(), and pqReadData().
{
int newsize = conn->inBufSize;
char *newbuf;
if (bytes_needed <= (size_t) newsize)
return 0;
/*
* If we need to enlarge the buffer, we first try to double it in size; if
* that doesn't work, enlarge in multiples of 8K. This avoids thrashing
* the malloc pool by repeated small enlargements.
*
* Note: tests for newsize > 0 are to catch integer overflow.
*/
do
{
newsize *= 2;
} while (newsize > 0 && bytes_needed > (size_t) newsize);
if (newsize > 0 && bytes_needed <= (size_t) newsize)
{
newbuf = realloc(conn->inBuffer, newsize);
if (newbuf)
{
/* realloc succeeded */
conn->inBuffer = newbuf;
conn->inBufSize = newsize;
return 0;
}
}
newsize = conn->inBufSize;
do
{
newsize += 8192;
} while (newsize > 0 && bytes_needed > (size_t) newsize);
if (newsize > 0 && bytes_needed <= (size_t) newsize)
{
newbuf = realloc(conn->inBuffer, newsize);
if (newbuf)
{
/* realloc succeeded */
conn->inBuffer = newbuf;
conn->inBufSize = newsize;
return 0;
}
}
/* realloc failed. Probably out of memory */
printfPQExpBuffer(&conn->errorMessage,
"cannot allocate memory for input buffer\n");
return EOF;
}
| int pqCheckOutBufferSpace | ( | size_t | bytes_needed, | |
| PGconn * | conn | |||
| ) |
Definition at line 349 of file fe-misc.c.
References pg_conn::errorMessage, pg_conn::outBuffer, pg_conn::outBufSize, printfPQExpBuffer(), and realloc.
Referenced by PQputCopyData(), pqPutMsgBytes(), and pqPutMsgStart().
{
int newsize = conn->outBufSize;
char *newbuf;
if (bytes_needed <= (size_t) newsize)
return 0;
/*
* If we need to enlarge the buffer, we first try to double it in size; if
* that doesn't work, enlarge in multiples of 8K. This avoids thrashing
* the malloc pool by repeated small enlargements.
*
* Note: tests for newsize > 0 are to catch integer overflow.
*/
do
{
newsize *= 2;
} while (newsize > 0 && bytes_needed > (size_t) newsize);
if (newsize > 0 && bytes_needed <= (size_t) newsize)
{
newbuf = realloc(conn->outBuffer, newsize);
if (newbuf)
{
/* realloc succeeded */
conn->outBuffer = newbuf;
conn->outBufSize = newsize;
return 0;
}
}
newsize = conn->outBufSize;
do
{
newsize += 8192;
} while (newsize > 0 && bytes_needed > (size_t) newsize);
if (newsize > 0 && bytes_needed <= (size_t) newsize)
{
newbuf = realloc(conn->outBuffer, newsize);
if (newbuf)
{
/* realloc succeeded */
conn->outBuffer = newbuf;
conn->outBufSize = newsize;
return 0;
}
}
/* realloc failed. Probably out of memory */
printfPQExpBuffer(&conn->errorMessage,
"cannot allocate memory for output buffer\n");
return EOF;
}
| int PQdsplen | ( | const char * | s, | |
| int | encoding | |||
| ) |
Definition at line 1151 of file fe-misc.c.
References pg_encoding_dsplen().
Referenced by pg_wcsformat(), pg_wcssize(), pg_wcswidth(), and strlen_max_width().
{
return pg_encoding_dsplen(encoding, s);
}
| int PQenv2encoding | ( | void | ) |
Definition at line 1160 of file fe-misc.c.
References encoding, and pg_char_to_encoding().
Referenced by main().
{
char *str;
int encoding = PG_SQL_ASCII;
str = getenv("PGCLIENTENCODING");
if (str && *str != '\0')
{
encoding = pg_char_to_encoding(str);
if (encoding < 0)
encoding = PG_SQL_ASCII;
}
return encoding;
}
| int pqFlush | ( | PGconn * | conn | ) |
Definition at line 920 of file fe-misc.c.
References pg_conn::outCount, pg_conn::Pfdebug, and pqSendSome().
Referenced by closePGconn(), PQconnectPoll(), PQconsumeInput(), pqEndcopy2(), pqEndcopy3(), PQflush(), pqFunctionCall2(), pqFunctionCall3(), PQgetResult(), pqPacketSend(), PQputCopyData(), PQputCopyEnd(), PQsendDescribe(), PQsendPrepare(), PQsendQuery(), PQsendQueryGuts(), and PQsetnonblocking().
{
if (conn->Pfdebug)
fflush(conn->Pfdebug);
if (conn->outCount > 0)
return pqSendSome(conn, conn->outCount);
return 0;
}
| int pqGetc | ( | char * | result, | |
| PGconn * | conn | |||
| ) |
Definition at line 99 of file fe-misc.c.
References pg_conn::inBuffer, pg_conn::inCursor, pg_conn::inEnd, and pg_conn::Pfdebug.
Referenced by getCopyDataMessage(), getCopyStart(), getReadyForQuery(), PQconnectPoll(), pqFunctionCall2(), pqFunctionCall3(), pqGetErrorNotice3(), pqParseInput2(), and pqParseInput3().
| int pqGetInt | ( | int * | result, | |
| size_t | bytes, | |||
| PGconn * | conn | |||
| ) |
Definition at line 272 of file fe-misc.c.
References pg_conn::inBuffer, pg_conn::inCursor, pg_conn::inEnd, pg_conn::noticeHooks, pg_conn::Pfdebug, and pqInternalNotice().
Referenced by getAnotherTuple(), getCopyDataMessage(), getCopyStart(), getNotify(), getParamDescriptions(), getRowDescriptions(), PQconnectPoll(), pqFunctionCall2(), pqFunctionCall3(), pqParseInput2(), and pqParseInput3().
{
uint16 tmp2;
uint32 tmp4;
switch (bytes)
{
case 2:
if (conn->inCursor + 2 > conn->inEnd)
return EOF;
memcpy(&tmp2, conn->inBuffer + conn->inCursor, 2);
conn->inCursor += 2;
*result = (int) ntohs(tmp2);
break;
case 4:
if (conn->inCursor + 4 > conn->inEnd)
return EOF;
memcpy(&tmp4, conn->inBuffer + conn->inCursor, 4);
conn->inCursor += 4;
*result = (int) ntohl(tmp4);
break;
default:
pqInternalNotice(&conn->noticeHooks,
"integer of size %lu not supported by pqGetInt",
(unsigned long) bytes);
return EOF;
}
if (conn->Pfdebug)
fprintf(conn->Pfdebug, "From backend (#%lu)> %d\n", (unsigned long) bytes, *result);
return 0;
}
| int pqGetnchar | ( | char * | s, | |
| size_t | len, | |||
| PGconn * | conn | |||
| ) |
Definition at line 200 of file fe-misc.c.
References fputnbytes(), pg_conn::inBuffer, pg_conn::inCursor, pg_conn::inEnd, and pg_conn::Pfdebug.
Referenced by getAnotherTuple(), PQconnectPoll(), pqFunctionCall2(), and pqFunctionCall3().
{
if (len > (size_t) (conn->inEnd - conn->inCursor))
return EOF;
memcpy(s, conn->inBuffer + conn->inCursor, len);
/* no terminating null */
conn->inCursor += len;
if (conn->Pfdebug)
{
fprintf(conn->Pfdebug, "From backend (%lu)> ", (unsigned long) len);
fputnbytes(conn->Pfdebug, s, len);
fprintf(conn->Pfdebug, "\n");
}
return 0;
}
| int pqGets | ( | PQExpBuffer | buf, | |
| PGconn * | conn | |||
| ) |
Definition at line 168 of file fe-misc.c.
References pqGets_internal().
Referenced by getNotify(), getParameterStatus(), getRowDescriptions(), pqGetErrorNotice2(), pqGetErrorNotice3(), pqParseInput2(), and pqParseInput3().
{
return pqGets_internal(buf, conn, true);
}
| int pqGets_append | ( | PQExpBuffer | buf, | |
| PGconn * | conn | |||
| ) |
Definition at line 174 of file fe-misc.c.
References pqGets_internal().
Referenced by PQconnectPoll().
{
return pqGets_internal(buf, conn, false);
}
| static int pqGets_internal | ( | PQExpBuffer | buf, | |
| PGconn * | conn, | |||
| bool | resetbuffer | |||
| ) | [static] |
Definition at line 137 of file fe-misc.c.
References appendBinaryPQExpBuffer(), PQExpBufferData::data, pg_conn::inBuffer, pg_conn::inCursor, pg_conn::inEnd, pg_conn::Pfdebug, and resetPQExpBuffer().
Referenced by pqGets(), and pqGets_append().
{
/* Copy conn data to locals for faster search loop */
char *inBuffer = conn->inBuffer;
int inCursor = conn->inCursor;
int inEnd = conn->inEnd;
int slen;
while (inCursor < inEnd && inBuffer[inCursor])
inCursor++;
if (inCursor >= inEnd)
return EOF;
slen = inCursor - conn->inCursor;
if (resetbuffer)
resetPQExpBuffer(buf);
appendBinaryPQExpBuffer(buf, inBuffer + conn->inCursor, slen);
conn->inCursor = ++inCursor;
if (conn->Pfdebug)
fprintf(conn->Pfdebug, "From backend> \"%s\"\n",
buf->data);
return 0;
}
| int PQmblen | ( | const char * | s, | |
| int | encoding | |||
| ) |
Definition at line 1141 of file fe-misc.c.
References pg_encoding_mblen().
Referenced by appendStringLiteral(), command_no_begin(), do_field(), is_select_command(), pg_wcsformat(), pg_wcssize(), pg_wcswidth(), processSQLNamePattern(), quote_if_needed(), skip_white_space(), strip_quotes(), strlen_max_width(), and strtokx().
{
return pg_encoding_mblen(encoding, s);
}
| int pqPutc | ( | char | c, | |
| PGconn * | conn | |||
| ) |
Definition at line 117 of file fe-misc.c.
References pg_conn::Pfdebug, and pqPutMsgBytes().
Referenced by PQsendDescribe(), and PQsendQueryGuts().
{
if (pqPutMsgBytes(&c, 1, conn))
return EOF;
if (conn->Pfdebug)
fprintf(conn->Pfdebug, "To backend> %c\n", c);
return 0;
}
| int pqPutInt | ( | int | value, | |
| size_t | bytes, | |||
| PGconn * | conn | |||
| ) |
Definition at line 312 of file fe-misc.c.
References pg_conn::noticeHooks, pg_conn::Pfdebug, pqInternalNotice(), and pqPutMsgBytes().
Referenced by pqFunctionCall2(), pqFunctionCall3(), PQsendPrepare(), and PQsendQueryGuts().
{
uint16 tmp2;
uint32 tmp4;
switch (bytes)
{
case 2:
tmp2 = htons((uint16) value);
if (pqPutMsgBytes((const char *) &tmp2, 2, conn))
return EOF;
break;
case 4:
tmp4 = htonl((uint32) value);
if (pqPutMsgBytes((const char *) &tmp4, 4, conn))
return EOF;
break;
default:
pqInternalNotice(&conn->noticeHooks,
"integer of size %lu not supported by pqPutInt",
(unsigned long) bytes);
return EOF;
}
if (conn->Pfdebug)
fprintf(conn->Pfdebug, "To backend (%lu#)> %d\n", (unsigned long) bytes, value);
return 0;
}
| static int pqPutMsgBytes | ( | const void * | buf, | |
| size_t | len, | |||
| PGconn * | conn | |||
| ) | [static] |
Definition at line 537 of file fe-misc.c.
References pg_conn::outBuffer, pg_conn::outMsgEnd, and pqCheckOutBufferSpace().
Referenced by pqPutc(), pqPutInt(), pqPutnchar(), and pqPuts().
| int pqPutMsgEnd | ( | PGconn * | conn | ) |
Definition at line 560 of file fe-misc.c.
References pg_conn::outBuffer, pg_conn::outCount, pg_conn::outMsgEnd, pg_conn::outMsgStart, pg_conn::Pfdebug, and pqSendSome().
Referenced by closePGconn(), pqEndcopy3(), pqFunctionCall2(), pqFunctionCall3(), pqPacketSend(), PQputCopyData(), PQputCopyEnd(), PQsendDescribe(), PQsendPrepare(), PQsendQuery(), and PQsendQueryGuts().
{
if (conn->Pfdebug)
fprintf(conn->Pfdebug, "To backend> Msg complete, length %u\n",
conn->outMsgEnd - conn->outCount);
/* Fill in length word if needed */
if (conn->outMsgStart >= 0)
{
uint32 msgLen = conn->outMsgEnd - conn->outMsgStart;
msgLen = htonl(msgLen);
memcpy(conn->outBuffer + conn->outMsgStart, &msgLen, 4);
}
/* Make message eligible to send */
conn->outCount = conn->outMsgEnd;
if (conn->outCount >= 8192)
{
int toSend = conn->outCount - (conn->outCount % 8192);
if (pqSendSome(conn, toSend) < 0)
return EOF;
/* in nonblock mode, don't complain if unable to send it all */
}
return 0;
}
Definition at line 492 of file fe-misc.c.
References pg_conn::outBuffer, pg_conn::outCount, pg_conn::outMsgEnd, pg_conn::outMsgStart, pg_conn::Pfdebug, PG_PROTOCOL_MAJOR, pqCheckOutBufferSpace(), and pg_conn::pversion.
Referenced by closePGconn(), pqEndcopy3(), pqFunctionCall2(), pqFunctionCall3(), pqPacketSend(), PQputCopyData(), PQputCopyEnd(), PQsendDescribe(), PQsendPrepare(), PQsendQuery(), and PQsendQueryGuts().
{
int lenPos;
int endPos;
/* allow room for message type byte */
if (msg_type)
endPos = conn->outCount + 1;
else
endPos = conn->outCount;
/* do we want a length word? */
if (force_len || PG_PROTOCOL_MAJOR(conn->pversion) >= 3)
{
lenPos = endPos;
/* allow room for message length */
endPos += 4;
}
else
lenPos = -1;
/* make sure there is room for message header */
if (pqCheckOutBufferSpace(endPos, conn))
return EOF;
/* okay, save the message type byte if any */
if (msg_type)
conn->outBuffer[conn->outCount] = msg_type;
/* set up the message pointers */
conn->outMsgStart = lenPos;
conn->outMsgEnd = endPos;
/* length word, if needed, will be filled in by pqPutMsgEnd */
if (conn->Pfdebug)
fprintf(conn->Pfdebug, "To backend> Msg %c\n",
msg_type ? msg_type : ' ');
return 0;
}
| int pqPutnchar | ( | const char * | s, | |
| size_t | len, | |||
| PGconn * | conn | |||
| ) |
Definition at line 251 of file fe-misc.c.
References fputnbytes(), pg_conn::Pfdebug, and pqPutMsgBytes().
Referenced by pqFunctionCall2(), pqFunctionCall3(), pqPacketSend(), PQputCopyData(), PQputCopyEnd(), and PQsendQueryGuts().
{
if (pqPutMsgBytes(s, len, conn))
return EOF;
if (conn->Pfdebug)
{
fprintf(conn->Pfdebug, "To backend> ");
fputnbytes(conn->Pfdebug, s, len);
fprintf(conn->Pfdebug, "\n");
}
return 0;
}
| int pqPuts | ( | const char * | s, | |
| PGconn * | conn | |||
| ) |
Definition at line 184 of file fe-misc.c.
References pg_conn::Pfdebug, and pqPutMsgBytes().
Referenced by pqFunctionCall2(), PQputCopyEnd(), PQsendDescribe(), PQsendPrepare(), PQsendQuery(), and PQsendQueryGuts().
{
if (pqPutMsgBytes(s, strlen(s) + 1, conn))
return EOF;
if (conn->Pfdebug)
fprintf(conn->Pfdebug, "To backend> \"%s\"\n", s);
return 0;
}
| int pqReadData | ( | PGconn * | conn | ) |
Definition at line 602 of file fe-misc.c.
References EAGAIN, ECONNRESET, EINTR, pg_conn::errorMessage, EWOULDBLOCK, pg_conn::inBuffer, pg_conn::inBufSize, pg_conn::inCursor, pg_conn::inEnd, pg_conn::inStart, libpq_gettext, memmove, pqCheckInBufferSpace(), pqDropConnection(), pqReadReady(), pqsecure_read(), printfPQExpBuffer(), pg_conn::sock, SOCK_ERRNO, and pg_conn::status.
Referenced by PQconnectPoll(), PQconsumeInput(), pqFunctionCall2(), pqFunctionCall3(), pqGetCopyData2(), pqGetCopyData3(), pqGetline2(), pqGetline3(), PQgetResult(), pqHandleSendFailure(), pqSendSome(), and pqSetenvPoll().
{
int someread = 0;
int nread;
if (conn->sock < 0)
{
printfPQExpBuffer(&conn->errorMessage,
libpq_gettext("connection not open\n"));
return -1;
}
/* Left-justify any data in the buffer to make room */
if (conn->inStart < conn->inEnd)
{
if (conn->inStart > 0)
{
memmove(conn->inBuffer, conn->inBuffer + conn->inStart,
conn->inEnd - conn->inStart);
conn->inEnd -= conn->inStart;
conn->inCursor -= conn->inStart;
conn->inStart = 0;
}
}
else
{
/* buffer is logically empty, reset it */
conn->inStart = conn->inCursor = conn->inEnd = 0;
}
/*
* If the buffer is fairly full, enlarge it. We need to be able to enlarge
* the buffer in case a single message exceeds the initial buffer size. We
* enlarge before filling the buffer entirely so as to avoid asking the
* kernel for a partial packet. The magic constant here should be large
* enough for a TCP packet or Unix pipe bufferload. 8K is the usual pipe
* buffer size, so...
*/
if (conn->inBufSize - conn->inEnd < 8192)
{
if (pqCheckInBufferSpace(conn->inEnd + (size_t) 8192, conn))
{
/*
* We don't insist that the enlarge worked, but we need some room
*/
if (conn->inBufSize - conn->inEnd < 100)
return -1; /* errorMessage already set */
}
}
/* OK, try to read some data */
retry3:
nread = pqsecure_read(conn, conn->inBuffer + conn->inEnd,
conn->inBufSize - conn->inEnd);
if (nread < 0)
{
if (SOCK_ERRNO == EINTR)
goto retry3;
/* Some systems return EAGAIN/EWOULDBLOCK for no data */
#ifdef EAGAIN
if (SOCK_ERRNO == EAGAIN)
return someread;
#endif
#if defined(EWOULDBLOCK) && (!defined(EAGAIN) || (EWOULDBLOCK != EAGAIN))
if (SOCK_ERRNO == EWOULDBLOCK)
return someread;
#endif
/* We might get ECONNRESET here if using TCP and backend died */
#ifdef ECONNRESET
if (SOCK_ERRNO == ECONNRESET)
goto definitelyFailed;
#endif
/* pqsecure_read set the error message for us */
return -1;
}
if (nread > 0)
{
conn->inEnd += nread;
/*
* Hack to deal with the fact that some kernels will only give us back
* 1 packet per recv() call, even if we asked for more and there is
* more available. If it looks like we are reading a long message,
* loop back to recv() again immediately, until we run out of data or
* buffer space. Without this, the block-and-restart behavior of
* libpq's higher levels leads to O(N^2) performance on long messages.
*
* Since we left-justified the data above, conn->inEnd gives the
* amount of data already read in the current message. We consider
* the message "long" once we have acquired 32k ...
*/
if (conn->inEnd > 32768 &&
(conn->inBufSize - conn->inEnd) >= 8192)
{
someread = 1;
goto retry3;
}
return 1;
}
if (someread)
return 1; /* got a zero read after successful tries */
/*
* A return value of 0 could mean just that no data is now available, or
* it could mean EOF --- that is, the server has closed the connection.
* Since we have the socket in nonblock mode, the only way to tell the
* difference is to see if select() is saying that the file is ready.
* Grumble. Fortunately, we don't expect this path to be taken much,
* since in normal practice we should not be trying to read data unless
* the file selected for reading already.
*
* In SSL mode it's even worse: SSL_read() could say WANT_READ and then
* data could arrive before we make the pqReadReady() test. So we must
* play dumb and assume there is more data, relying on the SSL layer to
* detect true EOF.
*/
#ifdef USE_SSL
if (conn->ssl)
return 0;
#endif
switch (pqReadReady(conn))
{
case 0:
/* definitely no data available */
return 0;
case 1:
/* ready for read */
break;
default:
printfPQExpBuffer(&conn->errorMessage,
libpq_gettext(
"server closed the connection unexpectedly\n"
"\tThis probably means the server terminated abnormally\n"
"\tbefore or while processing the request.\n"));
goto definitelyFailed;
}
/*
* Still not sure that it's EOF, because some data could have just
* arrived.
*/
retry4:
nread = pqsecure_read(conn, conn->inBuffer + conn->inEnd,
conn->inBufSize - conn->inEnd);
if (nread < 0)
{
if (SOCK_ERRNO == EINTR)
goto retry4;
/* Some systems return EAGAIN/EWOULDBLOCK for no data */
#ifdef EAGAIN
if (SOCK_ERRNO == EAGAIN)
return 0;
#endif
#if defined(EWOULDBLOCK) && (!defined(EAGAIN) || (EWOULDBLOCK != EAGAIN))
if (SOCK_ERRNO == EWOULDBLOCK)
return 0;
#endif
/* We might get ECONNRESET here if using TCP and backend died */
#ifdef ECONNRESET
if (SOCK_ERRNO == ECONNRESET)
goto definitelyFailed;
#endif
/* pqsecure_read set the error message for us */
return -1;
}
if (nread > 0)
{
conn->inEnd += nread;
return 1;
}
/*
* OK, we are getting a zero read even though select() says ready. This
* means the connection has been closed. Cope. Note that errorMessage
* has been set already.
*/
definitelyFailed:
pqDropConnection(conn);
conn->status = CONNECTION_BAD; /* No more connection to backend */
return -1;
}
| int pqReadReady | ( | PGconn * | conn | ) |
Definition at line 982 of file fe-misc.c.
References pqSocketCheck().
Referenced by pqReadData().
{
return pqSocketCheck(conn, 1, 0, (time_t) 0);
}
| static int pqSendSome | ( | PGconn * | conn, | |
| int | len | |||
| ) | [static] |
Definition at line 797 of file fe-misc.c.
References EAGAIN, EINTR, pg_conn::errorMessage, EWOULDBLOCK, libpq_gettext, memmove, Min, pg_conn::outBuffer, pg_conn::outCount, pqIsnonblocking, pqReadData(), pqsecure_write(), pqWait(), printfPQExpBuffer(), remaining, pg_conn::sock, SOCK_ERRNO, and TRUE.
Referenced by pqFlush(), and pqPutMsgEnd().
{
char *ptr = conn->outBuffer;
int remaining = conn->outCount;
int result = 0;
if (conn->sock < 0)
{
printfPQExpBuffer(&conn->errorMessage,
libpq_gettext("connection not open\n"));
return -1;
}
/* while there's still data to send */
while (len > 0)
{
int sent;
#ifndef WIN32
sent = pqsecure_write(conn, ptr, len);
#else
/*
* Windows can fail on large sends, per KB article Q201213. The
* failure-point appears to be different in different versions of
* Windows, but 64k should always be safe.
*/
sent = pqsecure_write(conn, ptr, Min(len, 65536));
#endif
if (sent < 0)
{
/* Anything except EAGAIN/EWOULDBLOCK/EINTR is trouble */
switch (SOCK_ERRNO)
{
#ifdef EAGAIN
case EAGAIN:
break;
#endif
#if defined(EWOULDBLOCK) && (!defined(EAGAIN) || (EWOULDBLOCK != EAGAIN))
case EWOULDBLOCK:
break;
#endif
case EINTR:
continue;
default:
/* pqsecure_write set the error message for us */
/*
* We used to close the socket here, but that's a bad idea
* since there might be unread data waiting (typically, a
* NOTICE message from the backend telling us it's
* committing hara-kiri...). Leave the socket open until
* pqReadData finds no more data can be read. But abandon
* attempt to send data.
*/
conn->outCount = 0;
return -1;
}
}
else
{
ptr += sent;
len -= sent;
remaining -= sent;
}
if (len > 0)
{
/*
* We didn't send it all, wait till we can send more.
*
* If the connection is in non-blocking mode we don't wait, but
* return 1 to indicate that data is still pending.
*/
if (pqIsnonblocking(conn))
{
result = 1;
break;
}
/*
* There are scenarios in which we can't send data because the
* communications channel is full, but we cannot expect the server
* to clear the channel eventually because it's blocked trying to
* send data to us. (This can happen when we are sending a large
* amount of COPY data, and the server has generated lots of
* NOTICE responses.) To avoid a deadlock situation, we must be
* prepared to accept and buffer incoming data before we try
* again. Furthermore, it is possible that such incoming data
* might not arrive until after we've gone to sleep. Therefore,
* we wait for either read ready or write ready.
*/
if (pqReadData(conn) < 0)
{
result = -1; /* error message already set up */
break;
}
if (pqWait(TRUE, TRUE, conn))
{
result = -1;
break;
}
}
}
/* shift the remaining contents of the buffer */
if (remaining > 0)
memmove(conn->outBuffer, ptr, remaining);
conn->outCount = remaining;
return result;
}
| int pqSkipnchar | ( | size_t | len, | |
| PGconn * | conn | |||
| ) |
Definition at line 229 of file fe-misc.c.
References fputnbytes(), pg_conn::inBuffer, pg_conn::inCursor, pg_conn::inEnd, and pg_conn::Pfdebug.
Referenced by getAnotherTuple().
| static int pqSocketCheck | ( | PGconn * | conn, | |
| int | forRead, | |||
| int | forWrite, | |||
| time_t | end_time | |||
| ) | [static] |
Definition at line 1006 of file fe-misc.c.
References EINTR, pg_conn::errorMessage, libpq_gettext, pqSocketPoll(), printfPQExpBuffer(), pg_conn::sock, SOCK_ERRNO, and SOCK_STRERROR.
Referenced by pqReadReady(), pqWaitTimed(), and pqWriteReady().
{
int result;
if (!conn)
return -1;
if (conn->sock < 0)
{
printfPQExpBuffer(&conn->errorMessage,
libpq_gettext("socket not open\n"));
return -1;
}
#ifdef USE_SSL
/* Check for SSL library buffering read bytes */
if (forRead && conn->ssl && SSL_pending(conn->ssl) > 0)
{
/* short-circuit the select */
return 1;
}
#endif
/* We will retry as long as we get EINTR */
do
result = pqSocketPoll(conn->sock, forRead, forWrite, end_time);
while (result < 0 && SOCK_ERRNO == EINTR);
if (result < 0)
{
char sebuf[256];
printfPQExpBuffer(&conn->errorMessage,
libpq_gettext("select() failed: %s\n"),
SOCK_STRERROR(SOCK_ERRNO, sebuf, sizeof(sebuf)));
}
return result;
}
| static int pqSocketPoll | ( | int | sock, | |
| int | forRead, | |||
| int | forWrite, | |||
| time_t | end_time | |||
| ) | [static] |
Definition at line 1056 of file fe-misc.c.
References now(), NULL, and select.
Referenced by pqSocketCheck().
{
/* We use poll(2) if available, otherwise select(2) */
#ifdef HAVE_POLL
struct pollfd input_fd;
int timeout_ms;
if (!forRead && !forWrite)
return 0;
input_fd.fd = sock;
input_fd.events = POLLERR;
input_fd.revents = 0;
if (forRead)
input_fd.events |= POLLIN;
if (forWrite)
input_fd.events |= POLLOUT;
/* Compute appropriate timeout interval */
if (end_time == ((time_t) -1))
timeout_ms = -1;
else
{
time_t now = time(NULL);
if (end_time > now)
timeout_ms = (end_time - now) * 1000;
else
timeout_ms = 0;
}
return poll(&input_fd, 1, timeout_ms);
#else /* !HAVE_POLL */
fd_set input_mask;
fd_set output_mask;
fd_set except_mask;
struct timeval timeout;
struct timeval *ptr_timeout;
if (!forRead && !forWrite)
return 0;
FD_ZERO(&input_mask);
FD_ZERO(&output_mask);
FD_ZERO(&except_mask);
if (forRead)
FD_SET(sock, &input_mask);
if (forWrite)
FD_SET(sock, &output_mask);
FD_SET(sock, &except_mask);
/* Compute appropriate timeout interval */
if (end_time == ((time_t) -1))
ptr_timeout = NULL;
else
{
time_t now = time(NULL);
if (end_time > now)
timeout.tv_sec = end_time - now;
else
timeout.tv_sec = 0;
timeout.tv_usec = 0;
ptr_timeout = &timeout;
}
return select(sock + 1, &input_mask, &output_mask,
&except_mask, ptr_timeout);
#endif /* HAVE_POLL */
}
| int pqWait | ( | int | forRead, | |
| int | forWrite, | |||
| PGconn * | conn | |||
| ) |
Definition at line 943 of file fe-misc.c.
References pqWaitTimed().
Referenced by pqFunctionCall2(), pqFunctionCall3(), pqGetCopyData2(), pqGetCopyData3(), pqGetline2(), pqGetline3(), PQgetResult(), and pqSendSome().
{
return pqWaitTimed(forRead, forWrite, conn, (time_t) -1);
}
| int pqWaitTimed | ( | int | forRead, | |
| int | forWrite, | |||
| PGconn * | conn, | |||
| time_t | finish_time | |||
| ) |
Definition at line 958 of file fe-misc.c.
References pg_conn::errorMessage, libpq_gettext, pqSocketCheck(), and printfPQExpBuffer().
Referenced by connectDBComplete(), and pqWait().
{
int result;
result = pqSocketCheck(conn, forRead, forWrite, finish_time);
if (result < 0)
return EOF; /* errorMessage is already set */
if (result == 0)
{
printfPQExpBuffer(&conn->errorMessage,
libpq_gettext("timeout expired\n"));
return EOF;
}
return 0;
}
| int pqWriteReady | ( | PGconn * | conn | ) |
Definition at line 992 of file fe-misc.c.
References pqSocketCheck().
{
return pqSocketCheck(conn, 0, 1, (time_t) 0);
}
1.7.1