From 734dc46d54c44a987cab30e45476b5532b057fdf Mon Sep 17 00:00:00 2001
From: greg7mdp <greg7mdp@gmail.com>
Date: Tue, 7 Nov 2023 08:46:47 -0500
Subject: [PATCH] Check for `mmap` failing (could happen if RAM size <
 database_size).

---
 src/pinnable_mapped_file.cpp | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/pinnable_mapped_file.cpp b/src/pinnable_mapped_file.cpp
index 2aba10d..e3b0ad0 100644
--- a/src/pinnable_mapped_file.cpp
+++ b/src/pinnable_mapped_file.cpp
@@ -233,6 +233,8 @@ void pinnable_mapped_file::setup_copy_on_write_mapping() {
       pmm->save_database_file(true, false);
 
    _cow_address = mmap(NULL, _database_size, PROT_READ | PROT_WRITE, MAP_PRIVATE, _file_mapping.get_mapping_handle().handle, 0);
+   if (_cow_address == MAP_FAILED)
+      BOOST_THROW_EXCEPTION(std::runtime_error(std::string("Failed to map database ") + _database_name + ": " + strerror(errno)));
    *((char*)_cow_address + header_dirty_bit_offset) = dirty; // set dirty bit in our memory mapping
    _segment_manager = reinterpret_cast<segment_manager*>((char*)_cow_address + header_size);