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/*
synchronous wrappers for libctdb
Copyright (C) Rusty Russell 2010
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, see <http://www.gnu.org/licenses/>.
*/
#include <ctdb.h>
#include <stdbool.h>
#include <poll.h>
#include <errno.h>
#include <stdlib.h>
#include "libctdb_private.h"
/* On failure, frees req and returns NULL. */
static struct ctdb_request *synchronous(struct ctdb_connection *ctdb,
struct ctdb_request *req,
bool *done)
{
struct pollfd fds;
/* Pass through allocation failures. */
if (!req)
return NULL;
fds.fd = ctdb_get_fd(ctdb);
while (!*done) {
fds.events = ctdb_which_events(ctdb);
if (poll(&fds, 1, -1) < 0) {
/* Signalled is OK, other error is bad. */
if (errno == EINTR)
continue;
ctdb_cancel(ctdb, req);
DEBUG(ctdb, LOG_ERR, "ctdb_synchronous: poll failed");
return NULL;
}
if (!ctdb_service(ctdb, fds.revents)) {
/* It can have failed after it completed request. */
if (!*done)
ctdb_cancel(ctdb, req);
else
ctdb_request_free(ctdb, req);
return NULL;
}
}
return req;
}
static void set(struct ctdb_connection *ctdb,
struct ctdb_request *req, bool *done)
{
*done = true;
}
bool ctdb_getrecmaster(struct ctdb_connection *ctdb,
uint32_t destnode, uint32_t *recmaster)
{
struct ctdb_request *req;
bool done = false;
bool ret = false;
req = synchronous(ctdb,
ctdb_getrecmaster_send(ctdb, destnode, set, &done),
&done);
if (req != NULL) {
ret = ctdb_getrecmaster_recv(ctdb, req, recmaster);
ctdb_request_free(ctdb, req);
}
return ret;
}
struct ctdb_db *ctdb_attachdb(struct ctdb_connection *ctdb,
const char *name, bool persistent,
uint32_t tdb_flags)
{
struct ctdb_request *req;
bool done = false;
struct ctdb_db *ret = NULL;
req = synchronous(ctdb,
ctdb_attachdb_send(ctdb, name, persistent, tdb_flags,
set, &done),
&done);
if (req != NULL) {
ret = ctdb_attachdb_recv(ctdb, req);
ctdb_request_free(ctdb, req);
}
return ret;
}
bool ctdb_getpnn(struct ctdb_connection *ctdb,
uint32_t destnode, uint32_t *pnn)
{
struct ctdb_request *req;
bool done = false;
bool ret = false;
req = synchronous(ctdb,
ctdb_getpnn_send(ctdb, destnode, set, &done),
&done);
if (req != NULL) {
ret = ctdb_getpnn_recv(ctdb, req, pnn);
ctdb_request_free(ctdb, req);
}
return ret;
}
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