From 99866db8cddf4f611d20ad17c9dd4b1b1bab394c Mon Sep 17 00:00:00 2001
From: Ben Gras <ben@minix3.org>
Date: Wed, 11 Apr 2012 17:15:15 +0200
Subject: [PATCH] vm: add MAP_FIXED

---
 include/sys/mman.h | 2 ++
 servers/vm/mmap.c  | 2 ++
 2 files changed, 4 insertions(+)

diff --git a/include/sys/mman.h b/include/sys/mman.h
index 4a28810ca..406db8c9f 100644
--- a/include/sys/mman.h
+++ b/include/sys/mman.h
@@ -56,6 +56,8 @@ typedef	__off_t		off_t;		/* file offset */
 #define	MAP_ALIGNMENT_64KB	MAP_ALIGN64K
 #define	MAP_IPC_SHARED	0x0100	/* share changes */
 
+#define MAP_FIXED      0x0200  /* require mapping to happen at hint */
+
 /*
  * Error indicator returned by mmap(2)
  */
diff --git a/servers/vm/mmap.c b/servers/vm/mmap.c
index dc9cc7c88..b74571613 100644
--- a/servers/vm/mmap.c
+++ b/servers/vm/mmap.c
@@ -88,6 +88,8 @@ int do_mmap(message *m)
 			addr = arch_vir2map(vmp, m->VMM_ADDR);
 			vr = map_page_region(vmp, addr, 0, len, MAP_NONE,
 				vrflags, mfflags);
+			if(!vr && (m->VMM_FLAGS & MAP_FIXED))
+				return ENOMEM;
 		}
 		if (!vr) {
 			/* No address given or address already in use. */