On 08/13/2013 12:35 PM, Michael Cronenworth wrote:
> When the client library (version 9.2.x) is compiled with a MinGW-w64 environment
> the resulting libpq.dll will not function. This has been reported previously
> with two bug reports, which have gone untouched.
>
> Bug 8151:
> http://www.postgresql.org/message-id/E1UbELM-0007NK-5L@xxxxxxxxxxxxxxxxxxxxxxx
> Bug 8162:
> http://www.postgresql.org/message-id/E1UcLPd-0000L4-TI@xxxxxxxxxxxxxxxxxxxxxxx
>
> I have tried compiling with every option enabled and every option disabled. Does
> anyone have any pointers or would anyone be willing to help solve this issue?
The connection problem was caused by incorrect error code checking after
connect(). The libpq interface defines a macro "SOCK_ERRNO" that on windows
calls WSAGetLastError(), which returns a Windows error code. The check after
connect() compares the Windows error code against the UNIX errno
EINPROGRRESS/EWOULDBLOCK.
I see there is a test in win32.h to see if EINPROGRESS is defined. It may not
have been defined in very old MinGW environments, but it is defined now. The
attached patches resolve the issue.
The compiled libpq.dll allows me to connect and run a SELECT and print out data.
--- postgresql-9.2.4/src/interfaces/libpq/fe-connect.c.orig 2013-08-15 09:08:59.850609595 -0500
+++ postgresql-9.2.4/src/interfaces/libpq/fe-connect.c 2013-08-15 09:42:59.001463906 -0500
@@ -1778,10 +1778,16 @@
if (connect(conn->sock, addr_cur->ai_addr,
addr_cur->ai_addrlen) < 0)
{
+#ifndef WIN32
if (SOCK_ERRNO == EINPROGRESS ||
SOCK_ERRNO == EWOULDBLOCK ||
SOCK_ERRNO == EINTR ||
+#else
+ if (SOCK_ERRNO == WSAEINPROGRESS ||
+ SOCK_ERRNO == WSAEWOULDBLOCK ||
+ SOCK_ERRNO == WSAEINTR ||
SOCK_ERRNO == 0)
+#endif
{
/*
* This is fine - we're in non-blocking mode, and
--- postgresql-9.2.4/src/interfaces/libpq/fe-misc.c.orig 2013-04-01 13:20:36.000000000 -0500
+++ postgresql-9.2.4/src/interfaces/libpq/fe-misc.c 2013-08-15 10:08:03.190928760 -0500
@@ -656,7 +656,11 @@
conn->inBufSize - conn->inEnd);
if (nread < 0)
{
+#ifndef WIN32
if (SOCK_ERRNO == EINTR)
+#else
+ if (SOCK_ERRNO == WSAEINTR)
+#endif
goto retry3;
/* Some systems return EAGAIN/EWOULDBLOCK for no data */
#ifdef EAGAIN
@@ -664,12 +668,20 @@
return someread;
#endif
#if defined(EWOULDBLOCK) && (!defined(EAGAIN) || (EWOULDBLOCK != EAGAIN))
+#ifndef WIN32
if (SOCK_ERRNO == EWOULDBLOCK)
+#else
+ if (SOCK_ERRNO == WSAEWOULDBLOCK)
+#endif
return someread;
#endif
/* We might get ECONNRESET here if using TCP and backend died */
#ifdef ECONNRESET
+#ifndef WIN32
if (SOCK_ERRNO == ECONNRESET)
+#else
+ if (SOCK_ERRNO == WSAECONNRESET)
+#endif
goto definitelyFailed;
#endif
/* pqsecure_read set the error message for us */
@@ -749,7 +761,11 @@
conn->inBufSize - conn->inEnd);
if (nread < 0)
{
+#ifndef WIN32
if (SOCK_ERRNO == EINTR)
+#else
+ if (SOCK_ERRNO == WSAEINTR)
+#endif
goto retry4;
/* Some systems return EAGAIN/EWOULDBLOCK for no data */
#ifdef EAGAIN
@@ -757,12 +773,20 @@
return 0;
#endif
#if defined(EWOULDBLOCK) && (!defined(EAGAIN) || (EWOULDBLOCK != EAGAIN))
+#ifndef WIN32
if (SOCK_ERRNO == EWOULDBLOCK)
+#else
+ if (SOCK_ERRNO == WSAEWOULDBLOCK)
+#endif
return 0;
#endif
/* We might get ECONNRESET here if using TCP and backend died */
#ifdef ECONNRESET
+#ifndef WIN32
if (SOCK_ERRNO == ECONNRESET)
+#else
+ if (SOCK_ERRNO == WSAECONNRESET)
+#endif
goto definitelyFailed;
#endif
/* pqsecure_read set the error message for us */
@@ -838,10 +862,18 @@
break;
#endif
#if defined(EWOULDBLOCK) && (!defined(EAGAIN) || (EWOULDBLOCK != EAGAIN))
+#ifndef WIN32
case EWOULDBLOCK:
+#else
+ case WSAEWOULDBLOCK:
+#endif
break;
#endif
+#ifndef WIN32
case EINTR:
+#else
+ case WSAEINTR:
+#endif
continue;
default:
--- postgresql-9.2.4/src/interfaces/libpq/fe-secure.c.orig 2013-08-15 10:10:44.039355056 -0500
+++ postgresql-9.2.4/src/interfaces/libpq/fe-secure.c 2013-08-15 10:22:57.767650717 -0500
@@ -433,12 +433,20 @@
#if defined(EWOULDBLOCK) && (!defined(EAGAIN) || (EWOULDBLOCK != EAGAIN))
case EWOULDBLOCK:
#endif
+#ifndef WIN32
case EINTR:
+#else
+ case WSAEWOULDBLOCK:
+ case WSAEINTR:
+#endif
/* no error message, caller is expected to retry */
break;
#ifdef ECONNRESET
case ECONNRESET:
+#ifdef WIN32
+ case WSAECONNRESET:
+#endif
printfPQExpBuffer(&conn->errorMessage,
libpq_gettext(
"server closed the connection unexpectedly\n"
@@ -617,7 +625,12 @@
#if defined(EWOULDBLOCK) && (!defined(EAGAIN) || (EWOULDBLOCK != EAGAIN))
case EWOULDBLOCK:
#endif
+#ifndef WIN32
case EINTR:
+#else
+ case WSAEWOULDBLOCK:
+ case WSAEINTR:
+#endif
/* no error message, caller is expected to retry */
break;
@@ -629,6 +642,9 @@
#ifdef ECONNRESET
case ECONNRESET:
#endif
+#ifdef WIN32
+ case WSAECONNRESET:
+#endif
printfPQExpBuffer(&conn->errorMessage,
libpq_gettext(
"server closed the connection unexpectedly\n"
--
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