ldb: Ensure we can open a new LDB after a fork()

Based on work for an mdb-specific test by Gary Lockyer

Signed-off-by: Andrew Bartlett <abartlet@samba.org>
Reviewed-by: Garming Sam <garming@catalyst.net.nz>
Autobuild-User(master): Andrew Bartlett <abartlet@samba.org>
Autobuild-Date(master): Wed May  9 07:27:24 CEST 2018 on sn-devel-144

diff --git a/lib/ldb/tests/ldb_mod_op_test.c b/lib/ldb/tests/ldb_mod_op_test.c
index 78084ef3c9d2e27177e0147bb952561845704ddf..67ac024db86be8a6249a15f8636352b33cc9dbfc 100644 (file)
--- a/lib/ldb/tests/ldb_mod_op_test.c
+++ b/lib/ldb/tests/ldb_mod_op_test.c
@@ -4025,6 +4025,66 @@ static void test_lock_read_across_fork(void **state)
        }
 }
 
+static void test_multiple_opens_across_fork(void **state)
+{
+       struct ldb_context *ldb1 = NULL;
+       struct ldb_context *ldb2 = NULL;
+       int ret;
+       struct ldbtest_ctx *test_ctx = NULL;
+       int pipes[2];
+       char buf[2];
+       int wstatus;
+       pid_t pid, child_pid;
+
+       test_ctx = talloc_get_type_abort(*state, struct ldbtest_ctx);
+
+       /*
+        * Open the database again
+        */
+       ldb1 = ldb_init(test_ctx, test_ctx->ev);
+       ret = ldb_connect(ldb1, test_ctx->dbpath, LDB_FLG_RDONLY, NULL);
+       assert_int_equal(ret, 0);
+
+       ldb2 = ldb_init(test_ctx, test_ctx->ev);
+       ret = ldb_connect(ldb2, test_ctx->dbpath, 0, NULL);
+       assert_int_equal(ret, 0);
+
+       ret = pipe(pipes);
+       assert_int_equal(ret, 0);
+
+       child_pid = fork();
+       if (child_pid == 0) {
+               struct ldb_context *ldb3 = NULL;
+
+               close(pipes[0]);
+               ldb3 = ldb_init(test_ctx, test_ctx->ev);
+               ret = ldb_connect(ldb3, test_ctx->dbpath, 0, NULL);
+               if (ret != 0) {
+                       print_error(__location__": ldb_connect returned (%d)\n",
+                                   ret);
+                       exit(ret);
+               }
+               ret = write(pipes[1], "GO", 2);
+               if (ret != 2) {
+                       print_error(__location__
+                                     " write returned (%d)",
+                                     ret);
+                       exit(LDB_ERR_OPERATIONS_ERROR);
+               }
+               exit(LDB_SUCCESS);
+       }
+       close(pipes[1]);
+       ret = read(pipes[0], buf, 2);
+       assert_int_equal(ret, 2);
+
+       pid = waitpid(child_pid, &wstatus, 0);
+       assert_int_equal(pid, child_pid);
+
+       assert_true(WIFEXITED(wstatus));
+
+       assert_int_equal(WEXITSTATUS(wstatus), 0);
+}
+
 int main(int argc, const char **argv)
 {
        const struct CMUnitTest tests[] = {
@@ -4200,6 +4260,10 @@ int main(int argc, const char **argv)
                        test_lock_read_across_fork,
                        ldbtest_setup,
                        ldbtest_teardown),
+               cmocka_unit_test_setup_teardown(
+                       test_multiple_opens_across_fork,
+                       ldbtest_setup,
+                       ldbtest_teardown),
        };
 
        return cmocka_run_group_tests(tests, NULL, NULL);