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Make libpq on windows not try to send chunks larger than 64Kb.

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Per Microsoft knowledge base article Q201213, early versions of
Windows fail when we do this. Later versions of Windows appear
to have a higher limit than 64Kb, but do still fail on large
sends, so we unconditionally limit it for all versions.

Patch from Tom Lane.
This commit is contained in:
Magnus Hagander 2008-08-20 11:53:51 +00:00
parent 4dff669cf0
commit 1852a73c7a
1 changed files with 10 additions and 1 deletions
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11
src/interfaces/libpq/fe-misc.c
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@ -23,7 +23,7 @@
* Portions Copyright (c) 1994, Regents of the University of California
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/interfaces/libpq/fe-misc.c,v 1.133 2008/01/01 19:46:00 momjian Exp $
* $PostgreSQL: pgsql/src/interfaces/libpq/fe-misc.c,v 1.133.2.1 2008/08/20 11:53:51 mha Exp $
*
*-------------------------------------------------------------------------
*/
@ -752,7 +752,16 @@ pqSendSome(PGconn *conn, int len)
int sent;
char sebuf[256];
#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)
{