Cutthrough: fix race resulting in duplicate-delivery. Bug 2273

[exim.git] / src / OS / os.h-Linux

diff --git a/src/OS/os.h-Linux b/src/OS/os.h-Linux
index 57034649c6909e7422f724caad23caf8031c5704..539eeea330a4a1a2995df8a02c70426806c4ea38 100644 (file)
--- a/src/OS/os.h-Linux
+++ b/src/OS/os.h-Linux
@@ -1,4 +1,7 @@
 /* Exim: OS-specific C header file for Linux */
+/* Copyright (c) University of Cambridge 1995 - 2018 */
+/* See the file NOTICE for conditions of use and distribution. */
+
 
 /* Some old systems we've received bug-reports for have a <limits.h> which
 does not pull in <features.h>.  Best to just pull it in now and have done
@@ -72,11 +75,14 @@ then change the 0 to 1 in the next block. */
 # define EXIM_HAVE_OPENAT
 #endif
 
+/* TCP Fast Open support */
+
 #include <netinet/tcp.h>       /* for TCP_FASTOPEN */
 #include <sys/socket.h>                /* for MSG_FASTOPEN */
 #if defined(TCP_FASTOPEN) && !defined(MSG_FASTOPEN)
 # define MSG_FASTOPEN 0x20000000
 #endif
+#define EXIM_HAVE_TCPI_UNACKED
 
 
 /* End */