From c955d333bbffd02cb6f439489865ac3c37c9ff3b Mon Sep 17 00:00:00 2001
From: Fabian Groffen <grobian@gentoo.org>
Date: Mon, 13 Dec 2021 08:15:01 +0100
Subject: configure: add check for existence of sendfile()

This is based on https://gist.github.com/bmanojlovic/6529848, but
adapted to make the Solaris case a little bit less of a guess.

Signed-off-by: Fabian Groffen <grobian@gentoo.org>
---
 autotools/m4/ac_check_sendfile.m4 | 63 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 63 insertions(+)
 create mode 100644 autotools/m4/ac_check_sendfile.m4

(limited to 'autotools')

diff --git a/autotools/m4/ac_check_sendfile.m4 b/autotools/m4/ac_check_sendfile.m4
new file mode 100644
index 00000000..5ec428d9
--- /dev/null
+++ b/autotools/m4/ac_check_sendfile.m4
@@ -0,0 +1,63 @@
+AC_DEFUN([AC_CHECK_SENDFILE],[
+
+saved_LIBS="$LIBS"
+saved_CFLAGS="$CFLAGS"
+CFLAGS="$CFLAGS -Werror-implicit-function-declaration"
+
+dnl platforms like Solaris need libsendfile, first check if it's there
+AC_CHECK_LIB(sendfile, sendfile,
+             [
+                 LIBS="-lsendfile $LIBS"
+                 SENDFILE_LIBS="-lsendfile"
+                 AC_SUBST(SENDFILE_LIBS)
+             ], [])
+
+ac_sendfile_supported=no
+AC_MSG_CHECKING([whether sendfile() is supported and what prototype it has])
+
+dnl Linux/Solaris
+AC_LINK_IFELSE([AC_LANG_PROGRAM([[#include <sys/sendfile.h>
+                                  #include <stdio.h>]],
+                                [[sendfile(1, 1, NULL, 0);]])],
+    [
+        AC_DEFINE(HAVE_SENDFILE4_SUPPORT, 1,
+                  [Define this if Linux/Solaris sendfile() is supported])
+        AC_MSG_RESULT([Linux/Solaris sendfile()])
+        ac_sendfile_supported=yes
+    ], [])
+
+dnl FreeBSD-like
+if test x$ac_sendfile_supported = xno; then
+    AC_LINK_IFELSE([AC_LANG_PROGRAM([[#include <sys/socket.h>
+                                      #include <stdio.h>]],
+                                    [[sendfile(1, 1, 0, 0, NULL, NULL, 0);]])],
+    [
+        AC_DEFINE(HAVE_SENDFILE7_SUPPORT, 1,
+                  [Define this if FreeBSD sendfile() is supported])
+        AC_MSG_RESULT([FreeBSD sendfile()])
+        ac_sendfile_supported=yes
+    ], [])
+fi
+
+dnl macOS-like
+if test x$ac_sendfile_supported = xno; then
+    AC_LINK_IFELSE([AC_LANG_PROGRAM([[#include <sys/socket.h>
+                                      #include <stdio.h>
+                                      #include <sys/uio.h>]],
+                                    [[sendfile(1, 1, 0, NULL, NULL, 0);]])],
+    [
+        AC_DEFINE(HAVE_SENDFILE6_SUPPORT, 1,
+                  [Define this if MacOS sendfile() is supported])
+        AC_MSG_RESULT([MacOS sendfile()])
+        ac_sendfile_supported=yes
+    ], [])
+fi
+
+if test x$ac_sendfile_supported = xno; then
+    AC_MSG_RESULT([no sendfile() support, using read/send])
+fi
+
+CFLAGS="$saved_CFLAGS"
+LIBS="$saved_LIBS"
+
+])
-- 
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