Automatically raise the core file size limit if CoreDumpDirectory
is configured.

--- httpd-2.4.1/server/core.c.orig	2012-02-22 00:09:24.000000000 +0100
+++ httpd-2.4.1/server/core.c	2012-02-22 00:15:07.329200901 +0100
@@ -4433,6 +4433,24 @@
     }
     apr_pool_cleanup_register(pconf, NULL, ap_mpm_end_gen_helper,
                               apr_pool_cleanup_null);
+#ifdef RLIMIT_CORE
+    if (ap_coredumpdir_configured) {
+        struct rlimit lim;
+
+        if (getrlimit(RLIMIT_CORE, &lim) == 0 && lim.rlim_cur == 0) {
+            lim.rlim_cur = lim.rlim_max;
+            if (setrlimit(RLIMIT_CORE, &lim) == 0) {
+                ap_log_error(APLOG_MARK, APLOG_NOTICE, 0, NULL,
+                             "core dump file size limit raised to %lu bytes",
+                             lim.rlim_cur);
+            } else {
+                ap_log_error(APLOG_MARK, APLOG_NOTICE, errno, NULL,
+                             "core dump file size is zero, setrlimit failed");
+            }
+        }
+    }
+#endif
+
     return OK;
 }