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forgot to add this
(This used to be ctdb commit 30fc56b7489e42633532964096e53faee1319dde)
This commit is contained in:
Andrew Tridgell
parent
1e00d1d39e
commit
006227e80a
192
ctdb/server/eventscript.c
Normal file
192
ctdb/server/eventscript.c
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/*
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event script handling
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Copyright (C) Andrew Tridgell 2007
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include "includes.h"
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#include "system/filesys.h"
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#include "system/wait.h"
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#include "../include/ctdb_private.h"
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#include "lib/events/events.h"
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/*
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run the event script - varargs version
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*/
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static int ctdb_event_script_v(struct ctdb_context *ctdb, const char *fmt, va_list ap)
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{
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char *options, *cmdstr;
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int ret;
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va_list ap2;
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struct stat st;
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if (stat(ctdb->takeover.event_script, &st) != 0 &&
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errno == ENOENT) {
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DEBUG(0,("No event script found at '%s'\n", ctdb->takeover.event_script));
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return 0;
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}
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va_copy(ap2, ap);
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options = talloc_vasprintf(ctdb, fmt, ap2);
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va_end(ap2);
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CTDB_NO_MEMORY(ctdb, options);
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cmdstr = talloc_asprintf(ctdb, "%s %s", ctdb->takeover.event_script, options);
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CTDB_NO_MEMORY(ctdb, cmdstr);
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ret = system(cmdstr);
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if (ret != -1) {
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ret = WEXITSTATUS(ret);
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}
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talloc_free(cmdstr);
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talloc_free(options);
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return ret;
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}
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/*
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run the event script
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*/
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int ctdb_event_script(struct ctdb_context *ctdb, const char *fmt, ...)
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{
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va_list ap;
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int ret;
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va_start(ap, fmt);
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ret = ctdb_event_script_v(ctdb, fmt, ap);
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va_end(ap);
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return ret;
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}
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struct ctdb_event_script_state {
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struct ctdb_context *ctdb;
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pid_t child;
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void (*callback)(struct ctdb_context *, int, void *);
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int fd[2];
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void *private_data;
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};
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/* called when child is finished */
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static void ctdb_event_script_handler(struct event_context *ev, struct fd_event *fde,
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uint16_t flags, void *p)
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{
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struct ctdb_event_script_state *state =
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talloc_get_type(p, struct ctdb_event_script_state);
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int status = -1;
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void (*callback)(struct ctdb_context *, int, void *) = state->callback;
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void *private_data = state->private_data;
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struct ctdb_context *ctdb = state->ctdb;
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waitpid(state->child, &status, 0);
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if (status != -1) {
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status = WEXITSTATUS(status);
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}
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talloc_set_destructor(state, NULL);
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talloc_free(state);
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callback(ctdb, status, private_data);
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}
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/* called when child times out */
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static void ctdb_event_script_timeout(struct event_context *ev, struct timed_event *te,
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struct timeval t, void *p)
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{
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struct ctdb_event_script_state *state = talloc_get_type(p, struct ctdb_event_script_state);
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void (*callback)(struct ctdb_context *, int, void *) = state->callback;
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void *private_data = state->private_data;
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struct ctdb_context *ctdb = state->ctdb;
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DEBUG(0,("event script timed out\n"));
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talloc_free(state);
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callback(ctdb, -1, private_data);
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}
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/*
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destroy a running event script
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*/
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static int event_script_destructor(struct ctdb_event_script_state *state)
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{
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kill(state->child, SIGKILL);
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waitpid(state->child, NULL, 0);
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return 0;
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}
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/*
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run the event script in the background, calling the callback when
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finished
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*/
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int ctdb_event_script_callback(struct ctdb_context *ctdb,
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struct timeval timeout,
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TALLOC_CTX *mem_ctx,
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void (*callback)(struct ctdb_context *, int, void *),
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void *private_data,
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const char *fmt, ...)
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{
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struct ctdb_event_script_state *state;
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va_list ap;
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int ret;
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state = talloc(mem_ctx, struct ctdb_event_script_state);
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CTDB_NO_MEMORY(ctdb, state);
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state->ctdb = ctdb;
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state->callback = callback;
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state->private_data = private_data;
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ret = pipe(state->fd);
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if (ret != 0) {
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talloc_free(state);
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return -1;
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}
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state->child = fork();
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if (state->child == (pid_t)-1) {
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close(state->fd[0]);
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close(state->fd[1]);
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talloc_free(state);
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return -1;
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}
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if (state->child == 0) {
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close(state->fd[0]);
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ctdb_set_realtime(false);
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set_close_on_exec(state->fd[1]);
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va_start(ap, fmt);
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ret = ctdb_event_script_v(ctdb, fmt, ap);
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va_end(ap);
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_exit(ret);
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}
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talloc_set_destructor(state, event_script_destructor);
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close(state->fd[1]);
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event_add_fd(ctdb->ev, state, state->fd[0], EVENT_FD_READ|EVENT_FD_AUTOCLOSE,
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ctdb_event_script_handler, state);
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if (!timeval_is_zero(&timeout)) {
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event_add_timed(ctdb->ev, state, timeout, ctdb_event_script_timeout, state);
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}
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return 0;
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}
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