--- /dev/null
+/* Test forking while holding lock.
+ *
+ * There are only five ways to do this currently:
+ * (1) grab a tdb_chainlock, then fork.
+ * (2) grab a tdb_lockall, then fork.
+ * (3) grab a tdb_lockall_read, then fork.
+ * (4) start a transaction, then fork.
+ * (5) fork from inside a tdb_parse() callback.
+ *
+ * Note that we don't hold a lock across tdb_traverse callbacks, so
+ * that doesn't matter.
+ */
+#include <ccan/tdb2/tdb2.h>
+#include <ccan/tap/tap.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <sys/types.h>
+#include <sys/wait.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include "logging.h"
+
+static enum TDB_ERROR fork_in_parse(TDB_DATA key, TDB_DATA data,
+ struct tdb_context *tdb)
+{
+ int status, extra_messages;
+
+ if (tdb_get_flags(tdb) & TDB_VERSION1) {
+ extra_messages = 1;
+ } else {
+ extra_messages = 0;
+ }
+
+ if (fork() == 0) {
+ /* We expect this to fail. */
+ if (tdb_store(tdb, key, data, TDB_REPLACE) != TDB_ERR_LOCK)
+ exit(1);
+ tap_log_messages -= extra_messages;
+
+ if (tdb_fetch(tdb, key, &data) != TDB_ERR_LOCK)
+ exit(1);
+
+ tap_log_messages -= extra_messages;
+ if (tap_log_messages != 2)
+ exit(2);
+
+ tdb_close(tdb);
+ if (tap_log_messages != 2)
+ exit(3);
+ exit(0);
+ }
+ wait(&status);
+ ok1(WIFEXITED(status) && WEXITSTATUS(status) == 0);
+ return TDB_SUCCESS;
+}
+
+int main(int argc, char *argv[])
+{
+ unsigned int i;
+ struct tdb_context *tdb;
+ int flags[] = { TDB_DEFAULT, TDB_NOMMAP,
+ TDB_CONVERT, TDB_NOMMAP|TDB_CONVERT,
+ TDB_VERSION1, TDB_NOMMAP|TDB_VERSION1,
+ TDB_CONVERT|TDB_VERSION1,
+ TDB_NOMMAP|TDB_CONVERT|TDB_VERSION1 };
+ struct tdb_data key = tdb_mkdata("key", 3);
+ struct tdb_data data = tdb_mkdata("data", 4);
+
+ plan_tests(sizeof(flags) / sizeof(flags[0]) * 14);
+ for (i = 0; i < sizeof(flags) / sizeof(flags[0]); i++) {
+ int status, extra_messages;
+
+ if (flags[i] & TDB_VERSION1) {
+ extra_messages = 1;
+ } else {
+ extra_messages = 0;
+ }
+
+ tap_log_messages = 0;
+
+ tdb = tdb_open("run-fork-test.tdb", flags[i],
+ O_RDWR|O_CREAT|O_TRUNC, 0600, &tap_log_attr);
+ if (!ok1(tdb))
+ continue;
+
+ /* Put a record in here. */
+ ok1(tdb_store(tdb, key, data, TDB_REPLACE) == TDB_SUCCESS);
+
+ ok1(tdb_chainlock(tdb, key) == TDB_SUCCESS);
+ if (fork() == 0) {
+ /* We expect this to fail. */
+ if (tdb_store(tdb, key, data, TDB_REPLACE) != TDB_ERR_LOCK)
+ return 1;
+ tap_log_messages -= extra_messages;
+
+ if (tdb_fetch(tdb, key, &data) != TDB_ERR_LOCK)
+ return 1;
+ tap_log_messages -= extra_messages;
+
+ if (tap_log_messages != 2)
+ return 2;
+
+ tdb_chainunlock(tdb, key);
+ if (tap_log_messages != 3)
+ return 3;
+ tdb_close(tdb);
+ if (tap_log_messages != 3)
+ return 4;
+ return 0;
+ }
+ wait(&status);
+ ok1(WIFEXITED(status) && WEXITSTATUS(status) == 0);
+ tdb_chainunlock(tdb, key);
+
+ ok1(tdb_lockall(tdb) == TDB_SUCCESS);
+ if (fork() == 0) {
+ /* We expect this to fail. */
+ if (tdb_store(tdb, key, data, TDB_REPLACE) != TDB_ERR_LOCK)
+ return 1;
+ tap_log_messages -= extra_messages;
+
+ if (tdb_fetch(tdb, key, &data) != TDB_ERR_LOCK)
+ return 1;
+ tap_log_messages -= extra_messages;
+
+ if (tap_log_messages != 2)
+ return 2;
+
+ tdb_unlockall(tdb);
+ if (tap_log_messages != 2)
+ return 3;
+ tdb_close(tdb);
+ if (tap_log_messages != 2)
+ return 4;
+ return 0;
+ }
+ wait(&status);
+ ok1(WIFEXITED(status) && WEXITSTATUS(status) == 0);
+ tdb_unlockall(tdb);
+
+ ok1(tdb_lockall_read(tdb) == TDB_SUCCESS);
+ if (fork() == 0) {
+ /* We expect this to fail. */
+ /* This would always fail anyway... */
+ if (tdb_store(tdb, key, data, TDB_REPLACE) != TDB_ERR_LOCK)
+ return 1;
+ tap_log_messages -= extra_messages;
+
+ if (tdb_fetch(tdb, key, &data) != TDB_ERR_LOCK)
+ return 1;
+ tap_log_messages -= extra_messages;
+
+ if (tap_log_messages != 2)
+ return 2;
+
+ tdb_unlockall_read(tdb);
+ if (tap_log_messages != 2)
+ return 3;
+ tdb_close(tdb);
+ if (tap_log_messages != 2)
+ return 4;
+ return 0;
+ }
+ wait(&status);
+ ok1(WIFEXITED(status) && WEXITSTATUS(status) == 0);
+ tdb_unlockall_read(tdb);
+
+ ok1(tdb_transaction_start(tdb) == TDB_SUCCESS);
+ /* If transactions is empty, noop "commit" succeeds. */
+ ok1(tdb_delete(tdb, key) == TDB_SUCCESS);
+ if (fork() == 0) {
+ /* We expect this to fail. */
+ if (tdb_store(tdb, key, data, TDB_REPLACE) != TDB_ERR_LOCK)
+ return 1;
+ tap_log_messages -= extra_messages;
+
+ if (tdb_fetch(tdb, key, &data) != TDB_ERR_LOCK)
+ return 1;
+ tap_log_messages -= extra_messages;
+
+ if (tap_log_messages != 2)
+ return 2;
+
+ if (tdb_transaction_commit(tdb) != TDB_ERR_LOCK)
+ return 3;
+ tap_log_messages -= extra_messages;
+
+ tdb_close(tdb);
+ if (tap_log_messages < 3)
+ return 4;
+ return 0;
+ }
+ wait(&status);
+ ok1(WIFEXITED(status) && WEXITSTATUS(status) == 0);
+ tdb_transaction_cancel(tdb);
+
+ ok1(tdb_parse_record(tdb, key, fork_in_parse, tdb)
+ == TDB_SUCCESS);
+ tdb_close(tdb);
+ ok1(tap_log_messages == 0);
+ }
+ return exit_status();
+}
projects / ccan / blobdiff