diff -r -C3 -p old/src/sockets.c new/src/sockets.c
*** old/src/sockets.c	Sun Apr 11 13:43:56 2004
--- new/src/sockets.c	Fri Jun 23 17:15:35 2006
***************
*** 2,7 ****
--- 2,13 ----
   * $Copyright$
   */
  
+ /*
+  * 2006/06/23 Alessandro Di Marco <dmr@c0nc3pt.com>
+  * Fixed some illegal va_arg() invocations (see below for details.)
+  *
+  */
+ 
  #include "nglobal.h"
  #include "network.h"
  #include "group.h"
*************** EXPORT int emitf (char *fmt, ...) EXP_(G
*** 604,609 ****
--- 610,630 ----
  		    {
  			char buf[MAX_SYSLOG]; /* should be more than enough */
  			vsnprintf(buf, MAX_SYSLOG-1, fmt, ap);
+ 
+ 			/* WARNING: multiple va_arg() invocations in the same
+ 			 * va_start() / va_end() block are forbidden (see the
+ 			 * man page!) Although these give no apparent problems
+ 			 * on the i386 architecture, for instance on amd64 are
+ 			 * very likely to produce sigsegves (page errors). As a
+ 			 * consequence, I have switched to a more legacy
+ 			 * behaviour.
+ 			 *
+ 			 * 2006/06/23 Alessandro Di Marco <dmr@c0nc3pt.com>
+ 			 */
+ 
+ 			va_end(ap);
+ 			va_start(ap, fmt);
+ 
  			logToClient (buf);
  		    }
  		i=vfprintf(clientout, fmt, ap);
*************** EXPORT int Cemitf (char *fmt, ...) EXP_(
*** 632,637 ****
--- 653,661 ----
  		char buf[MAX_SYSLOG];
  		vsnprintf(buf, MAX_SYSLOG-1, fmt, ap);
  		logToServer (scfg->host, buf);
+ 
+ 		va_end(ap);
+ 		va_start(ap, fmt);
  	}
  	i=vfprintf(scfg->fh, fmt, ap);
  	va_end(ap);
*************** EXPORT int Cfemitf (struct server_cfg *s
*** 657,662 ****
--- 681,689 ----
  		char buf[MAX_SYSLOG];
  		vsnprintf(buf, MAX_SYSLOG-1, fmt, ap);
  		logToServer (scfg->host, buf);
+ 
+ 		va_end(ap);
+ 		va_start(ap, fmt);
  	}
  	i=vfprintf(scfg->fh, fmt, ap);
  	va_end(ap);