From 1edc8b0525af34ad1030213a90086cd941056b8a Mon Sep 17 00:00:00 2001
From: Igor Pashev <pashev.igor@gmail.com>
Date: Sun, 6 Nov 2022 13:18:47 +0200
Subject: Support FreeBSD

---
 CMakeLists.txt | 33 ++++++++++++++++++++++++---------
 client.c       | 30 +++++++++++++++++++++++++++---
 configure.ac   | 12 +++++++++---
 3 files changed, 60 insertions(+), 15 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 37185b2..eaaf6b0 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,14 +1,29 @@
-CMAKE_MINIMUM_REQUIRED (VERSION 2.6)
-PROJECT (FileSender)
+CMAKE_MINIMUM_REQUIRED(VERSION 3.0)
+PROJECT(FileSender)
 
-INCLUDE (CheckIncludeFiles)
-CHECK_INCLUDE_FILES (sys/sendfile.h HAVE_SYS_SENDFILE_H)
+INCLUDE(CheckIncludeFiles)
+CHECK_INCLUDE_FILES(sys/sendfile.h HAVE_SYS_SENDFILE_H)
 
-INCLUDE (CheckFunctionExists)
-CHECK_FUNCTION_EXISTS (socket HAVE_SOCKET)
+IF(HAVE_SYS_SENDFILE_H)
+  ADD_COMPILE_DEFINITIONS(HAVE_SYS_SENDFILE_H)
+ENDIF(HAVE_SYS_SENDFILE_H)
+
+INCLUDE(CheckFunctionExists)
+CHECK_FUNCTION_EXISTS(sendfile HAVE_SENDFILE)
+IF(HAVE_SENDFILE)
+  ADD_COMPILE_DEFINITIONS(HAVE_SENDFILE)
+ENDIF(HAVE_SENDFILE)
+
+CHECK_FUNCTION_EXISTS(socket HAVE_SOCKET)
 IF(NOT HAVE_SOCKET)
-    CHECK_LIBRARY_EXISTS (socket socket "" HAVE_SOCKET)
+  CHECK_LIBRARY_EXISTS(socket socket "" HAVE_SOCKET)
 ENDIF(NOT HAVE_SOCKET)
 
-ADD_EXECUTABLE (server server.c utils.c utils.h)
-ADD_EXECUTABLE (client client.c utils.c utils.h)
+INCLUDE(CheckStructHasMember)
+CHECK_STRUCT_HAS_MEMBER("struct sf_hdtr" hdr_cnt sys/socket.h HAVE_STRUCT_SF_HDTR_HDR_CNT)
+IF(HAVE_STRUCT_SF_HDTR_HDR_CNT)
+  ADD_COMPILE_DEFINITIONS(HAVE_STRUCT_SF_HDTR_HDR_CNT)
+ENDIF(HAVE_STRUCT_SF_HDTR_HDR_CNT)
+
+ADD_EXECUTABLE(server server.c utils.c utils.h)
+ADD_EXECUTABLE(client client.c utils.c utils.h)
diff --git a/client.c b/client.c
index 9d04966..2cf94f3 100644
--- a/client.c
+++ b/client.c
@@ -10,12 +10,15 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
-#include <sys/sendfile.h>
 #include <sys/socket.h>
 #include <sys/stat.h>
 #include <sys/types.h>
 #include <unistd.h>
 
+#ifdef HAVE_SYS_SENDFILE_H
+#include <sys/sendfile.h>
+#endif
+
 #include "utils.h"
 
 const char *progname = NULL;
@@ -29,10 +32,31 @@ usage ()
   printf ("Default port is %s\n", port);
 }
 
+static ssize_t
+transmit (int fd, int sfd, size_t size)
+{
+#if HAVE_SENDFILE
+#if HAVE_STRUCT_SF_HDTR_HDR_CNT
+  int rc;
+  off_t sbytes;
+  rc = sendfile (sfd, fd, 0, size, (struct sf_hdtr *) NULL, &sbytes, 0);
+  if (rc < 0)
+    return rc;
+  return sbytes;
+#else
+  int rc;
+  off_t dummy = 0;              /* specially for Solaris (it crashes if sendfile's 3rd arg is NULL).  */
+  rc = sendfile (fd, sfd, &dummy, size);
+  return rc;
+#endif
+#else /* no HAVE_SENDFILE  */
+#error need sendfile()
+#endif
+}
+
 static void
 send_file (int fd, const char *filename)
 {
-  off_t dummy = 0;              /* specially for Solaris (it crashes if sendfile's 3rd arg is NULL).  */
   int sfd = open (filename, O_RDONLY);
   if (sfd < 0)
     fatal ("cannot read `%s'", filename);
@@ -47,7 +71,7 @@ send_file (int fd, const char *filename)
       rc = write (fd, name, filename_len);      /* filename\0payload  */
       if (rc != filename_len)
         fatal ("failed to write filename");
-      rc = sendfile (fd, sfd, &dummy, st.st_size);
+      rc = transmit (fd, sfd, st.st_size);
       if (rc < 0)
         fatal ("failed to send file `%s'", filename);
       else if (rc != st.st_size)
diff --git a/configure.ac b/configure.ac
index f3b9ee5..ef819ea 100644
--- a/configure.ac
+++ b/configure.ac
@@ -19,13 +19,19 @@ AC_CHECK_HEADERS([fcntl.h netinet/in.h stddef.h stdlib.h string.h sys/socket.h u
 # Checks for typedefs, structures, and compiler characteristics.
 AC_TYPE_SIZE_T
 AC_TYPE_SSIZE_T
-AC_CHECK_TYPES([ptrdiff_t])
+AC_CHECK_MEMBERS([struct sf_hdtr.hdr_cnt], [], [],
+[
+#ifdef HAVE_SYS_SOCKET_H
+#include <sys/socket.h>
+#endif
+])
 
 # Checks for library functions.
 AC_FUNC_MALLOC
-AC_CHECK_FUNCS([memset strerror])
+AC_CHECK_FUNCS([memset sendfile strerror])
 AC_SEARCH_LIBS([socket], [socket])
 AC_SEARCH_LIBS([sendfile], [sendfile])
 
-AC_OUTPUT([Makefile])
+AC_CONFIG_FILES([Makefile])
+AC_OUTPUT()
 
-- 
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