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/*
Unix SMB/CIFS implementation.
Regular background jobs as forked helpers
Copyright (C) Volker Lendecke 2012
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 "lib/util/tevent_ntstatus.h"
#include "lib/async_req/async_sock.h"
#include "include/messages.h"
#include "background.h"
struct background_job_state {
struct tevent_context *ev;
struct messaging_context *msg;
uint32_t *trigger_msgs;
size_t num_trigger_msgs;
bool parent_longlived;
int (*fn)(void *private_data);
void *private_data;
struct tevent_req *wakeup_req;
int pipe_fd;
};
static int background_job_state_destructor(struct background_job_state *s);
static void background_job_waited(struct tevent_req *subreq);
static void background_job_done(struct tevent_req *subreq);
static void background_job_trigger(
struct messaging_context *msg, void *private_data, uint32_t msg_type,
struct server_id server_id, DATA_BLOB *data);
struct tevent_req *background_job_send(TALLOC_CTX *mem_ctx,
struct tevent_context *ev,
struct messaging_context *msg,
uint32_t *trigger_msgs,
size_t num_trigger_msgs,
time_t initial_wait_sec,
int (*fn)(void *private_data),
void *private_data)
{
struct tevent_req *req, *subreq;
struct background_job_state *state;
size_t i;
req = tevent_req_create(mem_ctx, &state,
struct background_job_state);
if (req == NULL) {
return NULL;
}
state->ev = ev;
state->msg = msg;
if (num_trigger_msgs != 0) {
state->trigger_msgs = (uint32_t *)talloc_memdup(
state, trigger_msgs,
sizeof(uint32_t) * num_trigger_msgs);
if (tevent_req_nomem(state->trigger_msgs, req)) {
return tevent_req_post(req, ev);
}
state->num_trigger_msgs = num_trigger_msgs;
}
state->fn = fn;
state->private_data = private_data;
state->pipe_fd = -1;
talloc_set_destructor(state, background_job_state_destructor);
for (i=0; i<num_trigger_msgs; i++) {
NTSTATUS status;
status = messaging_register(msg, state, trigger_msgs[i],
background_job_trigger);
if (tevent_req_nterror(req, status)) {
return tevent_req_post(req, ev);
}
}
subreq = tevent_wakeup_send(
state, state->ev, timeval_current_ofs(initial_wait_sec, 0));
if (tevent_req_nomem(subreq, req)) {
return tevent_req_post(req, ev);
}
tevent_req_set_callback(subreq, background_job_waited, req);
state->wakeup_req = subreq;
return req;
}
static int background_job_state_destructor(struct background_job_state *state)
{
size_t i;
if (state->pipe_fd != -1) {
close(state->pipe_fd);
state->pipe_fd = -1;
}
for (i=0; i<state->num_trigger_msgs; i++) {
messaging_deregister(state->msg, state->trigger_msgs[i],
state);
}
return 0;
}
static void background_job_trigger(
struct messaging_context *msg, void *private_data, uint32_t msg_type,
struct server_id server_id, DATA_BLOB *data)
{
struct background_job_state *state = talloc_get_type_abort(
private_data, struct background_job_state);
if (state->wakeup_req == NULL) {
return;
}
if (!tevent_req_set_endtime(state->wakeup_req, state->ev,
timeval_zero())) {
DEBUG(10, ("tevent_req_set_endtime failed\n"));
}
}
static void background_job_waited(struct tevent_req *subreq)
{
struct tevent_req *req = tevent_req_callback_data(
subreq, struct tevent_req);
struct background_job_state *state = tevent_req_data(
req, struct background_job_state);
int fds[2];
int res;
bool ret;
ret = tevent_wakeup_recv(subreq);
TALLOC_FREE(subreq);
state->wakeup_req = NULL;
if (!ret) {
tevent_req_nterror(req, NT_STATUS_INTERNAL_ERROR);
return;
}
res = pipe(fds);
if (res == -1) {
tevent_req_nterror(req, map_nt_error_from_unix(errno));
return;
}
res = fork();
if (res == -1) {
int err = errno;
close(fds[0]);
close(fds[1]);
tevent_req_nterror(req, map_nt_error_from_unix(err));
return;
}
if (res == 0) {
/* child */
NTSTATUS status;
ssize_t written;
close(fds[0]);
status = reinit_after_fork(state->msg, state->ev, true);
if (NT_STATUS_IS_OK(status)) {
res = state->fn(state->private_data);
} else {
res = -1;
}
written = write(fds[1], &res, sizeof(res));
if (written == -1) {
_exit(1);
}
_exit(0);
}
/* parent */
close(fds[1]);
state->pipe_fd = fds[0];
subreq = read_packet_send(state, state->ev, state->pipe_fd,
sizeof(int), NULL, NULL);
if (tevent_req_nomem(subreq, req)) {
return;
}
tevent_req_set_callback(subreq, background_job_done, req);
}
static void background_job_done(struct tevent_req *subreq)
{
struct tevent_req *req = tevent_req_callback_data(
subreq, struct tevent_req);
struct background_job_state *state = tevent_req_data(
req, struct background_job_state);
ssize_t ret;
uint8_t *buf;
int err;
int wait_secs;
ret = read_packet_recv(subreq, talloc_tos(), &buf, &err);
TALLOC_FREE(subreq);
if (ret == -1) {
tevent_req_nterror(req, map_nt_error_from_unix(err));
return;
}
close(state->pipe_fd);
state->pipe_fd = -1;
memcpy(&wait_secs, buf, sizeof(wait_secs));
if (wait_secs == -1) {
tevent_req_done(req);
return;
}
subreq = tevent_wakeup_send(
state, state->ev, timeval_current_ofs(wait_secs, 0));
if (tevent_req_nomem(subreq, req)) {
return;
}
tevent_req_set_callback(subreq, background_job_waited, req);
state->wakeup_req = subreq;
}
NTSTATUS background_job_recv(struct tevent_req *req)
{
return tevent_req_simple_recv_ntstatus(req);
}
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