From f3a7f87cc18352110a7b95d64bb4dba0d119ad37 Mon Sep 17 00:00:00 2001
From: Thomas Voss <mail@thomasvoss.com>
Date: Sat, 27 Apr 2024 22:19:05 +0200
Subject: Explicitly save errno on failure in mkregion()

---
 lib/alloc/arena_alloc.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/lib/alloc/arena_alloc.c b/lib/alloc/arena_alloc.c
index eceb5b9..814b0bb 100644
--- a/lib/alloc/arena_alloc.c
+++ b/lib/alloc/arena_alloc.c
@@ -31,7 +31,9 @@ mkregion(size_t cap)
 	                 MAP_PRIVATE | MAP_ANONYMOUS, -1, 0),
 	};
 	if (r->data == MAP_FAILED) {
+		int save = errno;
 		free(r);
+		errno = save;
 		return nullptr;
 	}
 	return r;
-- 
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