Improve the db_env_open_nocreate test so that it works on BDB

git-svn-id: file:///svn/tokudb@624 c7de825b-a66e-492c-adef-691d508d4ae1

src/tests/test_db_env_open_nocreate.c

 // Try to open an environment where the directory does not exist 
 // Try when the dir exists but is not an initialized env
+// Try when the dir exists and we do DB_CREATE: it should work.
+// And after that the open should work without a DB_CREATE
+//   However, in BDB, after doing an DB_ENV->open and then a close, no state has changed
+//   One must actually create a DB I think...
 
 #include <assert.h>
 #include <db.h>
@@ -9,28 +13,52 @@
 #include <sys/stat.h>
 #include <sys/types.h>
 
+#include <unistd.h>
+
 // DIR is defined in the Makefile
 #define CKERR(r) if (r!=0) fprintf(stderr, "%s:%d error %d %s\n", __FILE__, __LINE__, r, db_strerror(r)); assert(r==0);
 
 int main() {
+    DB *db;
     DB_ENV *dbenv;
     int r;
+    int do_private;
 
-    system("rm -rf " DIR);
-
-    r = db_env_create(&dbenv, 0);
-    assert(r == 0);
-    r = dbenv->open(dbenv, DIR, DB_PRIVATE|DB_INIT_MPOOL, 0);
-    assert(r==ENOENT);
-    dbenv->close(dbenv,0); // free memory
+    for (do_private=0; do_private<2; do_private++) {
+	int private_flags = do_private ? DB_PRIVATE : 0;
+	
+	system("rm -rf " DIR);
+	r = db_env_create(&dbenv, 0);
+	CKERR(r);
+	r = dbenv->open(dbenv, DIR, private_flags|DB_INIT_MPOOL, 0);
+	assert(r==ENOENT);
+	dbenv->close(dbenv,0); // free memory
+	
+	system("rm -rf " DIR);
+	mkdir(DIR, 0777);
+	r = db_env_create(&dbenv, 0);
+	CKERR(r);
+	r = dbenv->open(dbenv, DIR, private_flags|DB_INIT_MPOOL, 0);
+	assert(r==ENOENT);
+	dbenv->close(dbenv,0); // free memory
+    }
 
+    // Now make sure that if we have a non-private DB that we can tell if it opened or not.
     system("rm -rf " DIR);
     mkdir(DIR, 0777);
     r = db_env_create(&dbenv, 0);
-    assert(r == 0);
-    r = dbenv->open(dbenv, DIR, DB_PRIVATE|DB_INIT_MPOOL, 0);
-    assert(r==ENOENT);
+    CKERR(r);
+    r = dbenv->open(dbenv, DIR, DB_CREATE|DB_INIT_MPOOL, 0);
+    CKERR(r);
+    r=db_create(&db, dbenv, 0);
+    CKERR(r);
+    dbenv->close(dbenv,0); // free memory
+    write(1,"d",1);
+    r = db_env_create(&dbenv, 0);
+    CKERR(r);
+    r = dbenv->open(dbenv, DIR, DB_INIT_MPOOL, 0);
+    CKERR(r);
     dbenv->close(dbenv,0); // free memory
-
     return 0;
 }
+