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/* 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 "tap-interface.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 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();
}
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