From 8672362a7a38b99dc6a82fbcef197d48f4744a5c Mon Sep 17 00:00:00 2001
From: Vincenz <vmechler@seemoo.tu-darmstadt.de>
Date: Wed, 10 Dec 2025 21:50:43 +0100
Subject: [PATCH] fix allocation of large circular buffers on unix: add flag to
 second mmap call of buffer allocation to treat address as a requirement and
 not as a hint.

---
 src/double_mapped_buffer/unix.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/double_mapped_buffer/unix.rs b/src/double_mapped_buffer/unix.rs
index 7048457..612722c 100644
--- a/src/double_mapped_buffer/unix.rs
+++ b/src/double_mapped_buffer/unix.rs
@@ -103,7 +103,7 @@ impl DoubleMappedBufferImpl {
                 buff.add(size),
                 size,
                 libc::PROT_READ | libc::PROT_WRITE,
-                libc::MAP_SHARED,
+                libc::MAP_SHARED | libc::MAP_FIXED_NOREPLACE,
                 fd,
                 0,
             );