The attached patch fixes a problem with InstallXLogFileSegment()'s use

of link() under Cygwin:

    http://archives.postgresql.org/pgsql-cygwin/2002-04/msg00072.php

Note that it appears that BeOS and Netware also have the above or
similar problem.

I have only verified that PostgreSQL builds under Cygwin with this
patch.
Since I cannot reproduce the problem, I cannot verify that the proposed
patch solves it.  Nevertheless, both Barry Pederson and David P.
Caldwell
attest that this patch solves the problem.  See the following for
details:

    http://archives.postgresql.org/pgsql-cygwin/2002-05/msg00043.php
    http://archives.postgresql.org/pgsql-cygwin/2002-05/msg00040.php

Jason Tishler

diff --git a/src/backend/access/transam/xlog.c b/src/backend/access/transam/xlog.c
index 62597195fbff7eb07b420268e7147eadfdd36310..be4c4446579bd0a28d110f46c47648121dd7b6bc 100644 (file)
--- a/src/backend/access/transam/xlog.c
+++ b/src/backend/access/transam/xlog.c
@@ -1503,7 +1503,7 @@ InstallXLogFileSegment(uint32 log, uint32 seg, char *tmppath,
         * overwrite an existing logfile.  However, there shouldn't be one, so
         * rename() is an acceptable substitute except for the truly paranoid.
         */
-#if !defined(__BEOS__) && !defined(N_PLAT_NLM)
+#if !defined(__BEOS__) && !defined(N_PLAT_NLM) && !defined(__CYGWIN__)
        if (link(tmppath, path) < 0)
                elog(PANIC, "link from %s to %s (initialization of log file %u, segment %u) failed: %m",
                         tmppath, path, log, seg);