Close up to the soft open file limit (same on Linux, but varies drastically on OS X).

Also, a Makefile fix for Darwin (OS X).
(closes issue #14542)
 Reported by: jtodd
 Patches: 
       20090901__issue14542.diff.txt uploaded by tilghman (license 14)
 Tested by: jtodd, tilghman
 Change-type: bugfix


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@215567 65c4cc65-6c06-0410-ace0-fbb531ad65f3

main/Makefile

@@ -44,7 +44,7 @@ endif
 
 ifneq ($(findstring darwin,$(OSARCH)),)
   AST_LIBS+=-lresolv
-  ASTLINK=-undefined suppress -force_flat_namespace
+  ASTLINK=-Xlinker -macosx_version_min -Xlinker 10.4 -Xlinker -undefined -Xlinker dynamic_lookup -force_flat_namespace
 else
 # These are used for all but Darwin
   ifneq ($(findstring LOADABLE_MODULES,$(MENUSELECT_CFLAGS)),)

main/app.c

@@ -2015,7 +2015,7 @@ void ast_close_fds_above_n(int n)
 	struct rlimit rl;
 	getrlimit(RLIMIT_NOFILE, &rl);
 	null = open("/dev/null", O_RDONLY);
-	for (x = n + 1; x < rl.rlim_max; x++) {
+	for (x = n + 1; x < rl.rlim_cur; x++) {
 		if (x != null) {
 			/* Side effect of dup2 is that it closes any existing fd without error.
 			 * This prevents valgrind and other debugging tools from sending up