Build: guards on openat()

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

diff --git a/src/OS/os.h-Linux b/src/OS/os.h-Linux
index 05c153e2c1aa68aacb800b7de2db60195f37453a..ba5f13450251d89f5afff43ec88a0edf3b0a99d9 100644 (file)
--- a/src/OS/os.h-Linux
+++ b/src/OS/os.h-Linux
@@ -1,10 +1,14 @@
 /* Exim: OS-specific C header file for Linux */
+/* Copyright (c) University of Cambridge 1995 - 2020 */
+/* 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
 with the issue. */
 
 #include <features.h>
+#include <sys/types.h>
 
 
 #define CRYPT_H
@@ -15,12 +19,14 @@ with the issue. */
 #define NO_IP_VAR_H
 #define SIG_IGN_WORKS
 
-/* When using the DKIM, setting HAVE_LINUX_SENDFILE can increase
+/* When using DKIM, setting OS_SENDFILE can increase
 performance on outgoing mail a bit. Note: With older glibc versions
 this setting will conflict with the _FILE_OFFSET_BITS=64 setting
-defined as part of the Linux CFLAGS. */
+defined as part of the Linux CFLAGS.  As of 2017 those are declared
+to be too old to build by default. */
 
-/* #define HAVE_LINUX_SENDFILE */
+#define OS_SENDFILE
+extern ssize_t os_sendfile(int, int, off_t *, size_t);
 
 #define F_FREESP     O_TRUNC
 typedef struct flock flock_t;
@@ -29,8 +35,8 @@ typedef struct flock flock_t;
 #define OS_STRSIGNAL
 
 #if defined(__linux__) || defined(__FreeBSD_kernel__) || defined(__NetBSD_kernel__)
-#define SIOCGIFCONF_GIVES_ADDR
-#define HAVE_SYS_MOUNT_H
+# define SIOCGIFCONF_GIVES_ADDR
+# define HAVE_SYS_MOUNT_H
 #endif
 
 #if defined(__linux__)
@@ -65,5 +71,24 @@ then change the 0 to 1 in the next block. */
 # define LLONG_MAX LONG_LONG_MAX
 #endif
 
+#if _POSIX_C_SOURCE >= 200809L || _ATFILE_SOURCE
+# 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
+#ifndef TCPI_OPT_SYN_DATA
+# define TCPI_OPT_SYN_DATA 32
+#endif
+
+/* "Abstract" Unix-socket names */
+#define EXIM_HAVE_ABSTRACT_UNIX_SOCKETS
+
 
 /* End */