From 2e0035dac827b2552263d777276eca08922b4b94 Mon Sep 17 00:00:00 2001
From: Avi Kivity <avi@cloudius-systems.com>
Date: Thu, 11 Dec 2014 10:43:44 +0200
Subject: [PATCH] posix: fix file_desc::map() error checking

mmap(2) returns MAP_FAILED on error, not nullptr.
---
 core/posix.hh | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/core/posix.hh b/core/posix.hh
index f020127ee9..e28fcd7a89 100644
--- a/core/posix.hh
+++ b/core/posix.hh
@@ -228,7 +228,7 @@ public:
 
     void *map(size_t size, unsigned flags, bool shared, size_t offset) {
         void *x = mmap(NULL, size, flags, shared ? MAP_SHARED : MAP_PRIVATE, _fd, offset);
-        throw_system_error_on(x == nullptr);
+        throw_system_error_on(x == MAP_FAILED);
         return x;
     }