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$OpenBSD$
Index: src/xshmfence_alloc.c
--- src/xshmfence_alloc.c.orig
+++ src/xshmfence_alloc.c
@@ -26,6 +26,10 @@
#include "xshmfenceint.h"
+#ifndef __MAP_NOFAULT
+#define __MAP_NOFAULT 0
+#endif
+
#if !HAVE_MEMFD_CREATE
#if HAVE_DECL___NR_MEMFD_CREATE
#include <asm/unistd.h>
@@ -105,7 +109,7 @@ struct xshmfence *
xshmfence_map_shm(int fd)
{
struct xshmfence *addr;
- addr = mmap (NULL, sizeof (struct xshmfence) , PROT_READ|PROT_WRITE, MAP_SHARED, fd, 0);
+ addr = mmap (NULL, sizeof (struct xshmfence) , PROT_READ|PROT_WRITE, MAP_SHARED | __MAP_NOFAULT, fd, 0);
if (addr == MAP_FAILED) {
close (fd);
return 0;
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