better guards

[users/heiko/exim.git] / src / OS / os.c-FreeBSD

diff --git a/src/OS/os.c-FreeBSD b/src/OS/os.c-FreeBSD
index a892e59408027dff2a2d6a5b6102e32ed0f9d5c2..cb0b0bf7fb5f190a8a6c72317e350014c081e389 100644 (file)
--- a/src/OS/os.c-FreeBSD
+++ b/src/OS/os.c-FreeBSD
@@ -2,7 +2,7 @@
 *     Exim - an Internet mail transport agent    *
 *************************************************/
 
-/* Copyright (c) Jeremy Harris 2017 */
+/* Copyright (c) Jeremy Harris 1995 - 2020 */
 /* See the file NOTICE for conditions of use and distribution. */
 
 /* FreeBSD-specific code. This is concatenated onto the generic
@@ -10,16 +10,38 @@ src/os.c file. */
 
 
 /*************
-* Sendfile   *
+Sendfile shim
 *************/
-#include <sys/sendfile.h>
 
 ssize_t
-os_sendfile(int out, int in, off_t * off, size_t cnt)
+os_sendfile(int out, int in, off_t * offp, size_t cnt)
 {
-off_t written;
-return sendfile(in, out, *off, cnt, NULL, &written, 0) < 0
-  ? (ssize_t) -1 : (ssize_t) written;
+off_t loff = *offp, written;
+
+if (sendfile(in, out, loff, cnt, NULL, &written, 0) < 0) return (ssize_t)-1;
+*offp = loff + written;
+return (ssize_t)written;
 }
 
+/*************************************************
+TCP Fast Open:  check that the ioctl is accepted
+*************************************************/
+
+#ifndef COMPILE_UTILITY
+void
+tfo_probe(void)
+{
+# ifdef TCP_FASTOPEN
+int sock;
+
+if (  (sock = socket(AF_INET, SOCK_STREAM, 0)) >= 0
+   && setsockopt(sock, IPPROTO_TCP, TCP_FASTOPEN, &on, sizeof(on) >= 0)
+   )
+  f.tcp_fastopen_ok = TRUE;
+close(sock);
+# endif
+}
+#endif
+
+
 /* End of os.c-Linux */