From 52d9bfde9428c26a0593a3a55d079ac2149d34c6 Mon Sep 17 00:00:00 2001
From: Rupert Carmichael <5050061-carmiker@users.noreply.gitlab.com>
Date: Mon, 5 Jul 2021 17:09:30 -0400
Subject: [PATCH] Port to OpenBSD

---
 settings.h | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/settings.h b/settings.h
index 8dbcec5a..48d6c39d 100644
--- a/settings.h
+++ b/settings.h
@@ -85,6 +85,30 @@
   #define LIBCO_ASSERT assert
 #endif
 
+#if defined (__OpenBSD__)
+  #if !defined(LIBCO_MALLOC) || !defined(LIBCO_FREE)
+	#include <unistd.h>
+	#include <sys/mman.h>
+
+	static void* malloc_obsd(size_t size) {
+	  long pagesize = sysconf(_SC_PAGESIZE);
+	  char* memory = (char*)mmap(NULL, size + pagesize, PROT_READ|PROT_WRITE, MAP_STACK|MAP_PRIVATE|MAP_ANON, -1, 0);
+	  if (memory == MAP_FAILED) return NULL;
+	  *(size_t*)memory = size + pagesize;
+	  memory += pagesize;
+	  return (void*)memory;
+	}
+
+	static void free_obsd(void *ptr) {
+	  char* memory = (char*)ptr - sysconf(_SC_PAGESIZE);
+	  munmap(memory, *(size_t*)memory);
+	}
+
+	#define LIBCO_MALLOC malloc_obsd
+	#define LIBCO_FREE   free_obsd
+  #endif
+#endif
+
 #if !defined(LIBCO_MALLOC) || !defined(LIBCO_FREE)
   #include <stdlib.h>
   #define LIBCO_MALLOC malloc