X-Git-Url: http://git.ozlabs.org/?a=blobdiff_plain;f=junkcode%2Frusty%40rustcorp.com.au-ntdb%2Ftest%2Fapi-fork-test.c;fp=junkcode%2Frusty%40rustcorp.com.au-ntdb%2Ftest%2Fapi-fork-test.c;h=32c6ebe4a0804358cfce66c1e382bf9fa1e685c4;hb=1aab74723e837a0fd8091e264a325bb2cdcdd0fa;hp=0000000000000000000000000000000000000000;hpb=979071e8587d4819a7f78613b68d29e222e5db63;p=ccan

diff --git a/junkcode/rusty@rustcorp.com.au-ntdb/test/api-fork-test.c b/junkcode/rusty@rustcorp.com.au-ntdb/test/api-fork-test.c
new file mode 100644
index 00000000..32c6ebe4
--- /dev/null
+++ b/junkcode/rusty@rustcorp.com.au-ntdb/test/api-fork-test.c
@@ -0,0 +1,195 @@
+/* Test forking while holding lock.
+ *
+ * There are only five ways to do this currently:
+ * (1) grab a ntdb_chainlock, then fork.
+ * (2) grab a ntdb_lockall, then fork.
+ * (3) grab a ntdb_lockall_read, then fork.
+ * (4) start a transaction, then fork.
+ * (5) fork from inside a ntdb_parse() callback.
+ *
+ * Note that we don't hold a lock across ntdb_traverse callbacks, so
+ * that doesn't matter.
+ */
+#include "config.h"
+#include "../ntdb.h"
+#include "../private.h"
+#include "tap-interface.h"
+#include "logging.h"
+#include "helpapi-external-agent.h"
+
+static bool am_child = false;
+
+static enum NTDB_ERROR fork_in_parse(NTDB_DATA key, NTDB_DATA data,
+				    struct ntdb_context *ntdb)
+{
+	int status;
+
+	if (fork() == 0) {
+		am_child = true;
+
+		/* We expect this to fail. */
+		if (ntdb_store(ntdb, key, data, NTDB_REPLACE) != NTDB_ERR_LOCK)
+			exit(1);
+
+		if (ntdb_fetch(ntdb, key, &data) != NTDB_ERR_LOCK)
+			exit(1);
+
+		if (tap_log_messages != 2)
+			exit(2);
+
+		return NTDB_SUCCESS;
+	}
+	wait(&status);
+	ok1(WIFEXITED(status) && WEXITSTATUS(status) == 0);
+	return NTDB_SUCCESS;
+}
+
+int main(int argc, char *argv[])
+{
+	unsigned int i;
+	struct ntdb_context *ntdb;
+	int flags[] = { NTDB_DEFAULT, NTDB_NOMMAP,
+			NTDB_CONVERT, NTDB_NOMMAP|NTDB_CONVERT };
+	NTDB_DATA key = ntdb_mkdata("key", 3);
+	NTDB_DATA data = ntdb_mkdata("data", 4);
+
+	plan_tests(sizeof(flags) / sizeof(flags[0]) * 14);
+	for (i = 0; i < sizeof(flags) / sizeof(flags[0]); i++) {
+		int status;
+
+		tap_log_messages = 0;
+
+		ntdb = ntdb_open("run-fork-test.ntdb",
+				 flags[i]|MAYBE_NOSYNC,
+				 O_RDWR|O_CREAT|O_TRUNC, 0600, &tap_log_attr);
+		if (!ok1(ntdb))
+			continue;
+
+		/* Put a record in here. */
+		ok1(ntdb_store(ntdb, key, data, NTDB_REPLACE) == NTDB_SUCCESS);
+
+		ok1(ntdb_chainlock(ntdb, key) == NTDB_SUCCESS);
+		if (fork() == 0) {
+			/* We expect this to fail. */
+			if (ntdb_store(ntdb, key, data, NTDB_REPLACE) != NTDB_ERR_LOCK)
+				return 1;
+
+			if (ntdb_fetch(ntdb, key, &data) != NTDB_ERR_LOCK)
+				return 1;
+
+			if (tap_log_messages != 2)
+				return 2;
+
+			/* Child can do this without any complaints. */
+			ntdb_chainunlock(ntdb, key);
+			if (tap_log_messages != 2)
+				return 3;
+			ntdb_close(ntdb);
+			if (tap_log_messages != 2)
+				return 4;
+			return 0;
+		}
+		wait(&status);
+		ok1(WIFEXITED(status) && WEXITSTATUS(status) == 0);
+		ntdb_chainunlock(ntdb, key);
+
+		ok1(ntdb_lockall(ntdb) == NTDB_SUCCESS);
+		if (fork() == 0) {
+			/* We expect this to fail. */
+			if (ntdb_store(ntdb, key, data, NTDB_REPLACE) != NTDB_ERR_LOCK)
+				return 1;
+
+			if (ntdb_fetch(ntdb, key, &data) != NTDB_ERR_LOCK)
+				return 1;
+
+			if (tap_log_messages != 2)
+				return 2;
+
+			/* Child can do this without any complaints. */
+			ntdb_unlockall(ntdb);
+			if (tap_log_messages != 2)
+				return 3;
+			ntdb_close(ntdb);
+			if (tap_log_messages != 2)
+				return 4;
+			return 0;
+		}
+		wait(&status);
+		ok1(WIFEXITED(status) && WEXITSTATUS(status) == 0);
+		ntdb_unlockall(ntdb);
+
+		ok1(ntdb_lockall_read(ntdb) == NTDB_SUCCESS);
+		if (fork() == 0) {
+			/* We expect this to fail. */
+			/* This would always fail anyway... */
+			if (ntdb_store(ntdb, key, data, NTDB_REPLACE) != NTDB_ERR_LOCK)
+				return 1;
+
+			if (ntdb_fetch(ntdb, key, &data) != NTDB_ERR_LOCK)
+				return 1;
+
+			if (tap_log_messages != 2)
+				return 2;
+
+			/* Child can do this without any complaints. */
+			ntdb_unlockall_read(ntdb);
+			if (tap_log_messages != 2)
+				return 3;
+			ntdb_close(ntdb);
+			if (tap_log_messages != 2)
+				return 4;
+			return 0;
+		}
+		wait(&status);
+		ok1(WIFEXITED(status) && WEXITSTATUS(status) == 0);
+		ntdb_unlockall_read(ntdb);
+
+		ok1(ntdb_transaction_start(ntdb) == NTDB_SUCCESS);
+		/* If transactions is empty, noop "commit" succeeds. */
+		ok1(ntdb_delete(ntdb, key) == NTDB_SUCCESS);
+		if (fork() == 0) {
+			int last_log_messages;
+
+			/* We expect this to fail. */
+			if (ntdb_store(ntdb, key, data, NTDB_REPLACE) != NTDB_ERR_LOCK)
+				return 1;
+
+			if (ntdb_fetch(ntdb, key, &data) != NTDB_ERR_LOCK)
+				return 1;
+
+			if (tap_log_messages != 2)
+				return 2;
+
+			if (ntdb_transaction_prepare_commit(ntdb)
+			    != NTDB_ERR_LOCK)
+				return 3;
+			if (tap_log_messages == 2)
+				return 4;
+
+			last_log_messages = tap_log_messages;
+			/* Child can do this without any complaints. */
+			ntdb_transaction_cancel(ntdb);
+			if (tap_log_messages != last_log_messages)
+				return 4;
+			ntdb_close(ntdb);
+			if (tap_log_messages != last_log_messages)
+				return 4;
+			return 0;
+		}
+		wait(&status);
+		ok1(WIFEXITED(status) && WEXITSTATUS(status) == 0);
+		ntdb_transaction_cancel(ntdb);
+
+		ok1(ntdb_parse_record(ntdb, key, fork_in_parse, ntdb)
+		    == NTDB_SUCCESS);
+		ntdb_close(ntdb);
+		if (am_child) {
+			/* Child can return from parse without complaints. */
+			if (tap_log_messages != 2)
+				exit(3);
+			exit(0);
+		}
+		ok1(tap_log_messages == 0);
+	}
+	return exit_status();
+}