From: Jeremy Harris <jgh146exb@wizmail.org>
Date: Tue, 23 Oct 2018 21:23:56 +0000 (+0100)
Subject: MacOS: probe for a usable TFO system configuration
X-Git-Tag: exim-4.92-RC1~60
X-Git-Url: https://git.exim.org/exim.git/commitdiff_plain/590faf89a2dd33a5f97f8e685efd019ac9c96e1e?ds=inline

MacOS: probe for a usable TFO system configuration
---

diff --git a/src/OS/os.h-Darwin b/src/OS/os.h-Darwin
index b597f9da3..d0a1a092f 100644
--- a/src/OS/os.h-Darwin
+++ b/src/OS/os.h-Darwin
@@ -53,4 +53,10 @@ in "man 2 getgroups". */
 #define _DARWIN_UNLIMITED_GETGROUPS
 #define EXIM_GROUPLIST_SIZE 64
 
+/* TCP_FASTOPEN support.  For the moment, claim there is none
+(the probe fails; unsure why).
+Sometime in the future need to investigate connectex(). */
+
+#define EXIM_TFO_PROBE
+
 /* End */
diff --git a/src/src/daemon.c b/src/src/daemon.c
index d69a7db3d..ee9ddcc4f 100644
--- a/src/src/daemon.c
+++ b/src/src/daemon.c
@@ -1459,7 +1459,8 @@ if (f.daemon_listen && !f.inetd_wait_mode)
         debug_printf("listening on %s port %d\n", ipa->address, ipa->port);
 
 #ifdef TCP_FASTOPEN
-    if (setsockopt(listen_sockets[sk], IPPROTO_TCP, TCP_FASTOPEN,
+    if (  f.tcp_fastopen_ok
+       && setsockopt(listen_sockets[sk], IPPROTO_TCP, TCP_FASTOPEN,
 		    &smtp_connect_backlog, sizeof(smtp_connect_backlog)))
       {
       DEBUG(D_any) debug_printf("setsockopt FASTOPEN: %s\n", strerror(errno));