From 3d0351533b20e353bc962701da6fc158d690ad6a Mon Sep 17 00:00:00 2001
From: Robin Kuck <robin@basicinside.de>
Date: Wed, 30 Aug 2023 10:54:02 +0200
Subject: [PATCH] Add freebsd support: Add MAP_FIXED to mmap call.

The codeblock fails on freebsd unless MAP_FIXED is
explicitly set.
---
 src/double_mapped_buffer/unix.rs | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/src/double_mapped_buffer/unix.rs b/src/double_mapped_buffer/unix.rs
index fb069f7..2c641ec 100644
--- a/src/double_mapped_buffer/unix.rs
+++ b/src/double_mapped_buffer/unix.rs
@@ -89,6 +89,16 @@ impl DoubleMappedBufferImpl {
                 return Err(DoubleMappedBufferError::UnmapSecond);
             }
 
+            #[cfg(target_os = "freebsd")]
+            let buff2 = libc::mmap(
+                buff.add(size),
+                size,
+                libc::PROT_READ | libc::PROT_WRITE,
+                libc::MAP_SHARED | libc::MAP_FIXED,
+                fd,
+                0,
+            );
+            #[cfg(not(target_os = "freebsd"))]
             let buff2 = libc::mmap(
                 buff.add(size),
                 size,