libpq(win32) s/errno/WSAGetLastError()/

From: Sergey Chumakov <yas(at)cit(dot)org(dot)by>
To: pgsql-patches(at)postgresql(dot)org
Subject: libpq(win32) s/errno/WSAGetLastError()/
Date: 2001-10-22 15:18:15
Message-ID: 20011022181815.A25652@cit.org.by
Views: Raw Message | Whole Thread | Download mbox | Resend email
Thread:
Lists: pgsql-patches


Your name : Sergey Chumakov
Your email address : yas(at)cit(dot)org(dot)by

System Configuration
---------------------
Architecture (example: Intel Pentium) : Intel Pentium

Operating System (example: Linux 2.0.26 ELF) : Windows 2000 SP2

PostgreSQL version (example: PostgreSQL-7.1.3): PostgreSQL-7.1.3

Compiler used (example: gcc 2.95.2) : MSVS6 SP5 (Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86)

Please enter a FULL description of your problem:
------------------------------------------------

libpq PQexec failed with large query (sizeof(Query) > 8192).

Please describe a way to repeat the problem. Please try to provide a
concise reproducible example, if at all possible:
----------------------------------------------------------------------

// SQL: create table test(f1 text); insert into test values(null);

#include <stdlib.h>
#include <string.h>
#include <libpq-fe.h>

int main(int argc, char* argv[])
{
PGconn *conn = NULL;
PGresult *res = NULL;
char *szQ = NULL;

PQconninfoOption* opt = PQconndefaults();

conn = PQsetdbLogin("localhost", NULL, NULL, NULL, "template1", "postgres", NULL);

szQ = (char*)malloc(32000);
memset(szQ, 'A', 64001);
memcpy(szQ, "update test set f1='", strlen("update test set f1='"));
szQ[63998] = '\'';
szQ[63999] = '\0';

if( PQstatus(conn) == CONNECTION_BAD )
{
printf("%s", PQerrorMessage(conn));
goto end_work;
}

res = PQexec(conn, szQ);
if( !res || PQresultStatus(res) != PGRES_COMMAND_OK )
{
printf("%s", PQerrorMessage(conn));
goto end_work;
}

end_work:
if( res )
PQclear(res);
if( conn )
PQfinish(conn);
free(szQ);

return 0;
}

If you know how this problem might be fixed, list the solution below:
---------------------------------------------------------------------

Small patch for socket error detection/processing

diff -rcN postgresql-7.1.3.orig/src/interfaces/libpq/fe-misc.c postgresql-7.1.3/src/interfaces/libpq/fe-misc.c
*** postgresql-7.1.3.orig/src/interfaces/libpq/fe-misc.c Sun Apr 1 02:13:30 2001
--- postgresql-7.1.3/src/interfaces/libpq/fe-misc.c Mon Oct 22 17:12:47 2001
***************
*** 328,340 ****
--- 328,347 ----
if (select(conn->sock + 1, &input_mask, (fd_set *) NULL, (fd_set *) NULL,
&timeout) < 0)
{
+ #ifdef WIN32
+ if (WSAGetLastError() == WSAEINTR)
+ #else
if (errno == EINTR)
+ #endif
/* Interrupted system call - we'll just try again */
goto retry;

printfPQExpBuffer(&conn->errorMessage,
"pqReadReady() -- select() failed: errno=%d\n%s\n",
errno, strerror(errno));
+ #ifdef WIN32
+ printf("Winsock error: %i\n", WSAGetLastError());
+ #endif
return -1;
}

***************
*** 362,374 ****
--- 369,388 ----
if (select(conn->sock + 1, (fd_set *) NULL, &input_mask, (fd_set *) NULL,
&timeout) < 0)
{
+ #ifdef WIN32
+ if (WSAGetLastError() == WSAEINTR)
+ #else
if (errno == EINTR)
+ #endif
/* Interrupted system call - we'll just try again */
goto retry;

printfPQExpBuffer(&conn->errorMessage,
"pqWriteReady() -- select() failed: errno=%d\n%s\n",
errno, strerror(errno));
+ #ifdef WIN32
+ printf("Winsock error: %i\n", WSAGetLastError());
+ #endif
return -1;
}
return FD_ISSET(conn->sock, &input_mask) ? 1 : 0;
***************
*** 441,448 ****
--- 455,475 ----
conn->inBufSize - conn->inEnd, 0);
if (nread < 0)
{
+ #ifdef WIN32
+ int wserrno = WSAGetLastError();
+
+ if (wserrno == WSAEINTR)
+ #else
if (errno == EINTR)
+ #endif
goto tryAgain;
+ #ifdef WIN32
+ if (wserrno == WSAEWOULDBLOCK)
+ return someread;
+
+ if (wserrno == WSAECONNRESET)
+ goto definitelyFailed;
+ #else
/* Some systems return EAGAIN/EWOULDBLOCK for no data */
#ifdef EAGAIN
if (errno == EAGAIN)
***************
*** 457,469 ****
if (errno == ECONNRESET)
goto definitelyFailed;
#endif
printfPQExpBuffer(&conn->errorMessage,
"pqReadData() -- read() failed: errno=%d\n%s\n",
errno, strerror(errno));
return -1;
}
if (nread > 0)
! {
conn->inEnd += nread;

/*
--- 484,500 ----
if (errno == ECONNRESET)
goto definitelyFailed;
#endif
+ #endif /* WIN32 */
printfPQExpBuffer(&conn->errorMessage,
"pqReadData() -- read() failed: errno=%d\n%s\n",
errno, strerror(errno));
+ #ifdef WIN32
+ printf("Winsock error: %i\n", WSAGetLastError());
+ #endif
return -1;
}
if (nread > 0)
! {
conn->inEnd += nread;

/*
***************
*** 527,534 ****
--- 558,578 ----
conn->inBufSize - conn->inEnd, 0);
if (nread < 0)
{
+ #ifdef WIN32
+ int wserrno = WSAGetLastError();
+
+ if (wserrno == WSAEINTR)
+ #else
if (errno == EINTR)
+ #endif
goto tryAgain2;
+ #ifdef WIN32
+ if (wserrno == WSAEWOULDBLOCK)
+ return someread;
+
+ if (wserrno == WSAECONNRESET)
+ goto definitelyFailed;
+ #else
/* Some systems return EAGAIN/EWOULDBLOCK for no data */
#ifdef EAGAIN
if (errno == EAGAIN)
***************
*** 543,556 ****
if (errno == ECONNRESET)
goto definitelyFailed;
#endif
printfPQExpBuffer(&conn->errorMessage,
"pqReadData() -- read() failed: errno=%d\n%s\n",
errno, strerror(errno));
return -1;
}
if (nread > 0)
{
! conn->inEnd += nread;
return 1;
}

--- 587,604 ----
if (errno == ECONNRESET)
goto definitelyFailed;
#endif
+ #endif
printfPQExpBuffer(&conn->errorMessage,
"pqReadData() -- read() failed: errno=%d\n%s\n",
errno, strerror(errno));
+ #ifdef WIN32
+ printf("Winsock error: %i\n", WSAGetLastError());
+ #endif
return -1;
}
if (nread > 0)
{
! conn->inEnd += nread;
return 1;
}

***************
*** 627,632 ****
--- 675,689 ----
* EPIPE or ECONNRESET, assume we've lost the backend
* connection permanently.
*/
+ #ifdef WIN32
+ switch (WSAGetLastError())
+ {
+ case WSAEWOULDBLOCK:
+ break;
+ case WSAEINTR:
+ continue;
+ case WSAECONNRESET:
+ #else
switch (errno)
{
#ifdef EAGAIN
***************
*** 644,649 ****
--- 701,707 ----
#ifdef ECONNRESET
case ECONNRESET:
#endif
+ #endif
printfPQExpBuffer(&conn->errorMessage,
"pqFlush() -- backend closed the channel unexpectedly.\n"
"\tThis probably means the backend terminated abnormally"
***************
*** 663,668 ****
--- 721,729 ----
printfPQExpBuffer(&conn->errorMessage,
"pqFlush() -- couldn't send data: errno=%d\n%s\n",
errno, strerror(errno));
+ #ifdef WIN32
+ printf("Winsock error: %i\n", WSAGetLastError());
+ #endif
/* We don't assume it's a fatal error... */
return EOF;
}
***************
*** 745,755 ****
--- 806,823 ----
if (select(conn->sock + 1, &input_mask, &output_mask, &except_mask,
(struct timeval *) NULL) < 0)
{
+ #ifdef WIN32
+ if (WSAGetLastError() == WSAEINTR)
+ #else
if (errno == EINTR)
+ #endif
goto retry;
printfPQExpBuffer(&conn->errorMessage,
"pqWait() -- select() failed: errno=%d\n%s\n",
errno, strerror(errno));
+ #ifdef WIN32
+ printf("Winsock error: %i\n", WSAGetLastError());
+ #endif
return EOF;
}
}

Responses

Browse pgsql-patches by date

  From Date Subject
Next Message Ned Wolpert 2001-10-22 17:48:33 Re: [PATCHES] Ant configuration
Previous Message Dave Cramer 2001-10-21 15:21:39 Re: Does PG's JDBC support prepared statements at all?