From 99c506325fa92be811d07a79969d5cae67750b10 Mon Sep 17 00:00:00 2001
From: Jeremy Allison <jra@samba.org>
Date: Thu, 21 Jun 2001 19:50:21 +0000
Subject: [PATCH] When mmap fails it returns -1 *NOT NULL*. This got regressed
 somehow..... Jeremy. (This used to be commit
 b77c8b536d4b6d2162f4932227f01cffb730c645)

---
 source3/tdb/tdb.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/source3/tdb/tdb.c b/source3/tdb/tdb.c
index 4d4fb79383e..c27f03fc35d 100644
--- a/source3/tdb/tdb.c
+++ b/source3/tdb/tdb.c
@@ -87,7 +87,13 @@ static void tdb_mmap(TDB_CONTEXT *tdb)
 		tdb->map_ptr = mmap(NULL, tdb->map_size, 
 				    PROT_READ|(tdb->read_only? 0:PROT_WRITE), 
 				    MAP_SHARED|MAP_FILE, tdb->fd, 0);
-		if (!tdb->map_ptr) {
+
+		/*
+		 * NB. When mmap fails it returns -1 *NOT* NULL !!!!
+		 */
+
+		if (tdb->map_ptr == (void *)-1) {
+			tdb->map_ptr = NULL;
 			TDB_LOG((tdb, 2, "tdb_mmap failed for size %d (%s)\n", 
 				 tdb->map_size, strerror(errno)));
 		}