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/*
event script handling
Copyright (C) Andrew Tridgell 2007
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 "includes.h"
#include "system/filesys.h"
#include "system/wait.h"
#include "../include/ctdb_private.h"
#include "lib/events/events.h"
/*
run the event script - varargs version
*/
static int ctdb_event_script_v(struct ctdb_context *ctdb, const char *fmt, va_list ap)
{
char *options, *cmdstr;
int ret;
va_list ap2;
struct stat st;
if (stat(ctdb->takeover.event_script, &st) != 0 &&
errno == ENOENT) {
DEBUG(0,("No event script found at '%s'\n", ctdb->takeover.event_script));
return 0;
}
va_copy(ap2, ap);
options = talloc_vasprintf(ctdb, fmt, ap2);
va_end(ap2);
CTDB_NO_MEMORY(ctdb, options);
cmdstr = talloc_asprintf(ctdb, "%s %s", ctdb->takeover.event_script, options);
CTDB_NO_MEMORY(ctdb, cmdstr);
ret = system(cmdstr);
if (ret != -1) {
ret = WEXITSTATUS(ret);
}
talloc_free(cmdstr);
talloc_free(options);
return ret;
}
/*
run the event script
*/
int ctdb_event_script(struct ctdb_context *ctdb, const char *fmt, ...)
{
va_list ap;
int ret;
va_start(ap, fmt);
ret = ctdb_event_script_v(ctdb, fmt, ap);
va_end(ap);
return ret;
}
struct ctdb_event_script_state {
struct ctdb_context *ctdb;
pid_t child;
void (*callback)(struct ctdb_context *, int, void *);
int fd[2];
void *private_data;
};
/* called when child is finished */
static void ctdb_event_script_handler(struct event_context *ev, struct fd_event *fde,
uint16_t flags, void *p)
{
struct ctdb_event_script_state *state =
talloc_get_type(p, struct ctdb_event_script_state);
int status = -1;
void (*callback)(struct ctdb_context *, int, void *) = state->callback;
void *private_data = state->private_data;
struct ctdb_context *ctdb = state->ctdb;
waitpid(state->child, &status, 0);
if (status != -1) {
status = WEXITSTATUS(status);
}
talloc_set_destructor(state, NULL);
talloc_free(state);
callback(ctdb, status, private_data);
}
/* called when child times out */
static void ctdb_event_script_timeout(struct event_context *ev, struct timed_event *te,
struct timeval t, void *p)
{
struct ctdb_event_script_state *state = talloc_get_type(p, struct ctdb_event_script_state);
void (*callback)(struct ctdb_context *, int, void *) = state->callback;
void *private_data = state->private_data;
struct ctdb_context *ctdb = state->ctdb;
DEBUG(0,("event script timed out\n"));
talloc_free(state);
callback(ctdb, -1, private_data);
}
/*
destroy a running event script
*/
static int event_script_destructor(struct ctdb_event_script_state *state)
{
kill(state->child, SIGKILL);
waitpid(state->child, NULL, 0);
return 0;
}
/*
run the event script in the background, calling the callback when
finished
*/
int ctdb_event_script_callback(struct ctdb_context *ctdb,
struct timeval timeout,
TALLOC_CTX *mem_ctx,
void (*callback)(struct ctdb_context *, int, void *),
void *private_data,
const char *fmt, ...)
{
struct ctdb_event_script_state *state;
va_list ap;
int ret;
state = talloc(mem_ctx, struct ctdb_event_script_state);
CTDB_NO_MEMORY(ctdb, state);
state->ctdb = ctdb;
state->callback = callback;
state->private_data = private_data;
ret = pipe(state->fd);
if (ret != 0) {
talloc_free(state);
return -1;
}
state->child = fork();
if (state->child == (pid_t)-1) {
close(state->fd[0]);
close(state->fd[1]);
talloc_free(state);
return -1;
}
if (state->child == 0) {
close(state->fd[0]);
ctdb_set_realtime(false);
set_close_on_exec(state->fd[1]);
va_start(ap, fmt);
ret = ctdb_event_script_v(ctdb, fmt, ap);
va_end(ap);
_exit(ret);
}
talloc_set_destructor(state, event_script_destructor);
close(state->fd[1]);
event_add_fd(ctdb->ev, state, state->fd[0], EVENT_FD_READ|EVENT_FD_AUTOCLOSE,
ctdb_event_script_handler, state);
if (!timeval_is_zero(&timeout)) {
event_add_timed(ctdb->ev, state, timeout, ctdb_event_script_timeout, state);
}
return 0;
}
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