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/* 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 "tdb2-source.h"
#include <ccan/tap/tap.h>
#include <sys/types.h>
#include <sys/wait.h>
#include "logging.h"
static enum TDB_ERROR fork_in_parse(TDB_DATA key, TDB_DATA data,
struct tdb_context *tdb)
{
int status;
if (fork() == 0) {
/* We expect this to fail. */
if (tdb_store(tdb, key, data, TDB_REPLACE) != TDB_ERR_LOCK)
exit(1);
if (tdb_fetch(tdb, key, &data) != TDB_ERR_LOCK)
exit(1);
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 };
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;
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;
if (tdb_fetch(tdb, key, &data) != TDB_ERR_LOCK)
return 1;
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;
if (tdb_fetch(tdb, key, &data) != TDB_ERR_LOCK)
return 1;
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;
if (tdb_fetch(tdb, key, &data) != TDB_ERR_LOCK)
return 1;
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;
if (tdb_fetch(tdb, key, &data) != TDB_ERR_LOCK)
return 1;
if (tap_log_messages != 2)
return 2;
if (tdb_transaction_commit(tdb) != TDB_ERR_LOCK)
return 3;
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();
}
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