ITS#7394 ignore WRITEMAP if RDONLY

diff --git a/libraries/libmdb/mdb.c b/libraries/libmdb/mdb.c
index 2c54cbd..c0eb625 100644 (file)
--- a/libraries/libmdb/mdb.c
+++ b/libraries/libmdb/mdb.c
@@ -3128,6 +3128,10 @@ mdb_env_open(MDB_env *env, const char *path, unsigned int flags, mode_t mode)
        if (rc)
                goto leave;
 
+       /* silently ignore WRITEMAP if we're only getting read access */
+       if (F_ISSET(flags, MDB_RDONLY) && F_ISSET(flags, MDB_WRITEMAP))
+               flags ^= MDB_WRITEMAP;
+
 #ifdef _WIN32
        if (F_ISSET(flags, MDB_RDONLY)) {
                oflags = GENERIC_READ;