/*
A server based on unix domain socket
Copyright (C) Amitay Isaacs 2016
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 .
*/
#include "replace.h"
#include "system/filesys.h"
#include "system/network.h"
#include "system/wait.h"
#include
#include
#include "lib/async_req/async_sock.h"
#include "lib/util/debug.h"
#include "lib/util/blocking.h"
#include "lib/util/dlinklist.h"
#include "lib/util/tevent_unix.h"
#include "lib/util/become_daemon.h"
#include "lib/util/sys_rw.h"
#include "common/logging.h"
#include "common/reqid.h"
#include "common/comm.h"
#include "common/pidfile.h"
#include "common/system.h"
#include "common/sock_daemon.h"
struct sock_socket {
struct sock_socket *prev, *next;
const char *sockpath;
struct sock_socket_funcs *funcs;
void *private_data;
int fd;
struct tevent_req *req;
};
struct sock_client {
struct sock_client *prev, *next;
struct tevent_req *req;
struct sock_client_context *client_ctx;
};
struct sock_client_context {
struct tevent_context *ev;
struct sock_socket *sock;
int fd;
struct comm_context *comm;
struct sock_client *client;
};
struct sock_daemon_context {
struct sock_daemon_funcs *funcs;
void *private_data;
struct pidfile_context *pid_ctx;
struct sock_socket *socket_list;
int startup_fd;
};
/*
* Process a single client
*/
static void sock_client_read_handler(uint8_t *buf, size_t buflen,
void *private_data);
static void sock_client_read_done(struct tevent_req *subreq);
static void sock_client_dead_handler(void *private_data);
static int sock_client_context_destructor(
struct sock_client_context *client_ctx);
static int sock_client_context_init(TALLOC_CTX *mem_ctx,
struct tevent_context *ev,
struct sock_socket *sock,
int client_fd,
struct sock_client *client,
struct sock_client_context **result)
{
struct sock_client_context *client_ctx;
int ret;
client_ctx = talloc_zero(mem_ctx, struct sock_client_context);
if (client_ctx == NULL) {
return ENOMEM;
}
client_ctx->ev = ev;
client_ctx->sock = sock;
client_ctx->fd = client_fd;
client_ctx->client = client;
ret = comm_setup(client_ctx, ev, client_fd,
sock_client_read_handler, client_ctx,
sock_client_dead_handler, client_ctx,
&client_ctx->comm);
if (ret != 0) {
talloc_free(client_ctx);
return ret;
}
if (sock->funcs->connect != NULL) {
pid_t pid;
bool status;
(void) ctdb_get_peer_pid(client_fd, &pid);
status = sock->funcs->connect(client_ctx,
pid,
sock->private_data);
if (! status) {
talloc_free(client_ctx);
close(client_fd);
return 0;
}
}
talloc_set_destructor(client_ctx, sock_client_context_destructor);
*result = client_ctx;
return 0;
}
static void sock_client_read_handler(uint8_t *buf, size_t buflen,
void *private_data)
{
struct sock_client_context *client_ctx = talloc_get_type_abort(
private_data, struct sock_client_context);
struct sock_socket *sock = client_ctx->sock;
struct tevent_req *subreq;
subreq = sock->funcs->read_send(client_ctx, client_ctx->ev,
client_ctx, buf, buflen,
sock->private_data);
if (subreq == NULL) {
talloc_free(client_ctx);
return;
}
tevent_req_set_callback(subreq, sock_client_read_done, client_ctx);
}
static void sock_client_read_done(struct tevent_req *subreq)
{
struct sock_client_context *client_ctx = tevent_req_callback_data(
subreq, struct sock_client_context);
struct sock_socket *sock = client_ctx->sock;
int ret;
bool status;
status = sock->funcs->read_recv(subreq, &ret);
if (! status) {
D_ERR("client read failed with ret=%d\n", ret);
talloc_free(client_ctx);
}
}
static void sock_client_dead_handler(void *private_data)
{
struct sock_client_context *client_ctx = talloc_get_type_abort(
private_data, struct sock_client_context);
struct sock_socket *sock = client_ctx->sock;
if (sock->funcs->disconnect != NULL) {
sock->funcs->disconnect(client_ctx, sock->private_data);
}
talloc_free(client_ctx);
}
static int sock_client_context_destructor(
struct sock_client_context *client_ctx)
{
TALLOC_FREE(client_ctx->client);
TALLOC_FREE(client_ctx->comm);
if (client_ctx->fd != -1) {
close(client_ctx->fd);
client_ctx->fd = -1;
}
return 0;
}
/*
* Process a single listening socket
*/
static int socket_setup(const char *sockpath, bool remove_before_use)
{
struct sockaddr_un addr;
size_t len;
int ret, fd;
memset(&addr, 0, sizeof(addr));
addr.sun_family = AF_UNIX;
len = strlcpy(addr.sun_path, sockpath, sizeof(addr.sun_path));
if (len >= sizeof(addr.sun_path)) {
D_ERR("socket path too long: %s\n", sockpath);
return -1;
}
fd = socket(AF_UNIX, SOCK_STREAM, 0);
if (fd == -1) {
D_ERR("socket create failed - %s\n", sockpath);
return -1;
}
ret = set_blocking(fd, false);
if (ret != 0) {
D_ERR("socket set nonblocking failed - %s\n", sockpath);
close(fd);
return -1;
}
if (remove_before_use) {
unlink(sockpath);
}
ret = bind(fd, (struct sockaddr *)&addr, sizeof(addr));
if (ret != 0) {
D_ERR("socket bind failed - %s\n", sockpath);
close(fd);
return -1;
}
ret = listen(fd, 10);
if (ret != 0) {
D_ERR("socket listen failed - %s\n", sockpath);
close(fd);
return -1;
}
D_NOTICE("listening on %s\n", sockpath);
return fd;
}
static int sock_socket_destructor(struct sock_socket *sock);
static int sock_socket_init(TALLOC_CTX *mem_ctx, const char *sockpath,
struct sock_socket_funcs *funcs,
void *private_data,
struct sock_socket **result)
{
struct sock_socket *sock;
if (funcs == NULL) {
return EINVAL;
}
if (funcs->read_send == NULL || funcs->read_recv == NULL) {
return EINVAL;
}
sock = talloc_zero(mem_ctx, struct sock_socket);
if (sock == NULL) {
return ENOMEM;
}
sock->sockpath = talloc_strdup(sock, sockpath);
if (sock->sockpath == NULL) {
talloc_free(sock);
return ENOMEM;
}
sock->funcs = funcs;
sock->private_data = private_data;
sock->fd = -1;
talloc_set_destructor(sock, sock_socket_destructor);
*result = sock;
return 0;
}
static int sock_socket_destructor(struct sock_socket *sock)
{
TALLOC_FREE(sock->req);
if (sock->fd != -1) {
close(sock->fd);
sock->fd = -1;
}
unlink(sock->sockpath);
return 0;
}
struct sock_socket_start_state {
struct tevent_context *ev;
struct sock_socket *sock;
struct sock_client *client_list;
};
static int sock_socket_start_state_destructor(
struct sock_socket_start_state *state);
static void sock_socket_start_new_client(struct tevent_req *subreq);
static int sock_socket_start_client_destructor(struct sock_client *client);
static struct tevent_req *sock_socket_start_send(TALLOC_CTX *mem_ctx,
struct tevent_context *ev,
struct sock_socket *sock,
bool remove_before_use)
{
struct tevent_req *req, *subreq;
struct sock_socket_start_state *state;
req = tevent_req_create(mem_ctx, &state,
struct sock_socket_start_state);
if (req == NULL) {
return NULL;
}
state->ev = ev;
state->sock = sock;
sock->fd = socket_setup(sock->sockpath, remove_before_use);
if (sock->fd == -1) {
tevent_req_error(req, EIO);
return tevent_req_post(req, ev);
}
talloc_set_destructor(state, sock_socket_start_state_destructor);
subreq = accept_send(state, ev, sock->fd);
if (tevent_req_nomem(subreq, req)) {
return tevent_req_post(req, ev);
}
tevent_req_set_callback(subreq, sock_socket_start_new_client, req);
sock->req = req;
return req;
}
static int sock_socket_start_state_destructor(
struct sock_socket_start_state *state)
{
struct sock_client *client;
while ((client = state->client_list) != NULL) {
talloc_free(client);
}
return 0;
}
static void sock_socket_start_new_client(struct tevent_req *subreq)
{
struct tevent_req *req = tevent_req_callback_data(
subreq, struct tevent_req);
struct sock_socket_start_state *state = tevent_req_data(
req, struct sock_socket_start_state);
struct sock_client *client;
int client_fd, ret;
client_fd = accept_recv(subreq, NULL, NULL, &ret);
TALLOC_FREE(subreq);
if (client_fd == -1) {
D_ERR("failed to accept new connection\n");
}
subreq = accept_send(state, state->ev, state->sock->fd);
if (tevent_req_nomem(subreq, req)) {
return;
}
tevent_req_set_callback(subreq, sock_socket_start_new_client, req);
if (client_fd == -1) {
return;
}
client = talloc_zero(state, struct sock_client);
if (tevent_req_nomem(client, req)) {
close(client_fd);
return;
}
client->req = req;
ret = sock_client_context_init(client, state->ev, state->sock,
client_fd, client, &client->client_ctx);
if (ret != 0) {
talloc_free(client);
return;
}
talloc_set_destructor(client, sock_socket_start_client_destructor);
DLIST_ADD(state->client_list, client);
}
static int sock_socket_start_client_destructor(struct sock_client *client)
{
struct sock_socket_start_state *state = tevent_req_data(
client->req, struct sock_socket_start_state);
DLIST_REMOVE(state->client_list, client);
TALLOC_FREE(client->client_ctx);
return 0;
}
static bool sock_socket_start_recv(struct tevent_req *req, int *perr,
TALLOC_CTX *mem_ctx, const char **sockpath)
{
struct sock_socket_start_state *state = tevent_req_data(
req, struct sock_socket_start_state);
int ret;
state->sock->req = NULL;
if (tevent_req_is_unix_error(req, &ret)) {
if (perr != NULL) {
*perr = ret;
}
return false;
}
if (sockpath != NULL) {
*sockpath = talloc_steal(mem_ctx, state->sock->sockpath);
}
return true;
}
/*
* Send message to a client
*/
struct tevent_req *sock_socket_write_send(TALLOC_CTX *mem_ctx,
struct tevent_context *ev,
struct sock_client_context *client_ctx,
uint8_t *buf, size_t buflen)
{
struct tevent_req *req;
req = comm_write_send(mem_ctx, ev, client_ctx->comm, buf, buflen);
return req;
}
bool sock_socket_write_recv(struct tevent_req *req, int *perr)
{
int ret;
bool status;
status = comm_write_recv(req, &ret);
if (! status) {
if (perr != NULL) {
*perr = ret;
}
}
return status;
}
/*
* Socket daemon
*/
int sock_daemon_setup(TALLOC_CTX *mem_ctx, const char *daemon_name,
const char *logging, const char *debug_level,
struct sock_daemon_funcs *funcs,
void *private_data,
struct sock_daemon_context **out)
{
struct sock_daemon_context *sockd;
int ret;
sockd = talloc_zero(mem_ctx, struct sock_daemon_context);
if (sockd == NULL) {
return ENOMEM;
}
sockd->funcs = funcs;
sockd->private_data = private_data;
sockd->startup_fd = -1;
ret = logging_init(sockd, logging, debug_level, daemon_name);
if (ret != 0) {
fprintf(stderr,
"Failed to initialize logging, logging=%s, debug=%s\n",
logging, debug_level);
return ret;
}
*out = sockd;
return 0;
}
int sock_daemon_add_unix(struct sock_daemon_context *sockd,
const char *sockpath,
struct sock_socket_funcs *funcs,
void *private_data)
{
struct sock_socket *sock;
int ret;
ret = sock_socket_init(sockd, sockpath, funcs, private_data, &sock);
if (ret != 0) {
return ret;
}
DLIST_ADD(sockd->socket_list, sock);
return 0;
}
void sock_daemon_set_startup_fd(struct sock_daemon_context *sockd, int fd)
{
sockd->startup_fd = fd;
}
/*
* Run socket daemon
*/
struct sock_daemon_run_state {
struct tevent_context *ev;
struct sock_daemon_context *sockd;
pid_t pid_watch;
int fd;
int exit_code;
};
static void sock_daemon_run_started(struct tevent_req *subreq);
static void sock_daemon_run_startup_done(struct tevent_req *subreq);
static void sock_daemon_run_signal_handler(struct tevent_context *ev,
struct tevent_signal *se,
int signum, int count, void *siginfo,
void *private_data);
static void sock_daemon_run_reconfigure(struct tevent_req *req);
static void sock_daemon_run_reconfigure_done(struct tevent_req *subreq);
static void sock_daemon_run_shutdown(struct tevent_req *req);
static void sock_daemon_run_shutdown_done(struct tevent_req *subreq);
static void sock_daemon_run_exit(struct tevent_req *req);
static bool sock_daemon_run_socket_listen(struct tevent_req *req);
static void sock_daemon_run_socket_fail(struct tevent_req *subreq);
static void sock_daemon_run_watch_pid(struct tevent_req *subreq);
static void sock_daemon_run_wait(struct tevent_req *req);
static void sock_daemon_run_wait_done(struct tevent_req *subreq);
static void sock_daemon_startup_notify(struct sock_daemon_context *sockd);
struct tevent_req *sock_daemon_run_send(TALLOC_CTX *mem_ctx,
struct tevent_context *ev,
struct sock_daemon_context *sockd,
const char *pidfile,
bool do_fork, bool create_session,
pid_t pid_watch)
{
struct tevent_req *req, *subreq;
struct sock_daemon_run_state *state;
struct tevent_signal *se;
req = tevent_req_create(mem_ctx, &state,
struct sock_daemon_run_state);
if (req == NULL) {
return NULL;
}
become_daemon(do_fork, !create_session, false);
if (pidfile != NULL) {
int ret = pidfile_context_create(sockd, pidfile,
&sockd->pid_ctx);
if (ret != 0) {
tevent_req_error(req, EEXIST);
return tevent_req_post(req, ev);
}
}
state->ev = ev;
state->sockd = sockd;
state->pid_watch = pid_watch;
state->fd = -1;
subreq = tevent_wakeup_send(state, ev,
tevent_timeval_current_ofs(0, 0));
if (tevent_req_nomem(subreq, req)) {
return tevent_req_post(req, ev);
}
tevent_req_set_callback(subreq, sock_daemon_run_started, req);
se = tevent_add_signal(ev, state, SIGHUP, 0,
sock_daemon_run_signal_handler, req);
if (tevent_req_nomem(se, req)) {
return tevent_req_post(req, ev);
}
se = tevent_add_signal(ev, state, SIGUSR1, 0,
sock_daemon_run_signal_handler, req);
if (tevent_req_nomem(se, req)) {
return tevent_req_post(req, ev);
}
se = tevent_add_signal(ev, state, SIGINT, 0,
sock_daemon_run_signal_handler, req);
if (tevent_req_nomem(se, req)) {
return tevent_req_post(req, ev);
}
se = tevent_add_signal(ev, state, SIGTERM, 0,
sock_daemon_run_signal_handler, req);
if (tevent_req_nomem(se, req)) {
return tevent_req_post(req, ev);
}
if (pid_watch > 1) {
subreq = tevent_wakeup_send(state, ev,
tevent_timeval_current_ofs(1,0));
if (tevent_req_nomem(subreq, req)) {
return tevent_req_post(req, ev);
}
tevent_req_set_callback(subreq, sock_daemon_run_watch_pid,
req);
}
return req;
}
static void sock_daemon_run_started(struct tevent_req *subreq)
{
struct tevent_req *req = tevent_req_callback_data(
subreq, struct tevent_req);
struct sock_daemon_run_state *state = tevent_req_data(
req, struct sock_daemon_run_state);
struct sock_daemon_context *sockd = state->sockd;
bool status;
status = tevent_wakeup_recv(subreq);
TALLOC_FREE(subreq);
if (! status) {
tevent_req_error(req, EIO);
return;
}
D_NOTICE("daemon started, pid=%u\n", getpid());
if (sockd->funcs != NULL && sockd->funcs->startup_send != NULL &&
sockd->funcs->startup_recv != NULL) {
subreq = sockd->funcs->startup_send(state, state->ev,
sockd->private_data);
if (tevent_req_nomem(subreq, req)) {
return;
}
tevent_req_set_callback(subreq, sock_daemon_run_startup_done,
req);
return;
}
if (sockd->funcs != NULL && sockd->funcs->startup != NULL) {
int ret;
ret = sockd->funcs->startup(sockd->private_data);
if (ret != 0) {
D_ERR("startup failed, ret=%d\n", ret);
tevent_req_error(req, EIO);
return;
}
D_NOTICE("startup completed successfully\n");
}
status = sock_daemon_run_socket_listen(req);
if (! status) {
return;
}
sock_daemon_run_wait(req);
sock_daemon_startup_notify(sockd);
}
static void sock_daemon_run_startup_done(struct tevent_req *subreq)
{
struct tevent_req *req = tevent_req_callback_data(
subreq, struct tevent_req);
struct sock_daemon_run_state *state = tevent_req_data(
req, struct sock_daemon_run_state);
struct sock_daemon_context *sockd = state->sockd;
int ret;
bool status;
status = sockd->funcs->startup_recv(subreq, &ret);
TALLOC_FREE(subreq);
if (! status) {
D_ERR("startup failed, ret=%d\n", ret);
tevent_req_error(req, EIO);
return;
}
D_NOTICE("startup completed successfully\n");
status = sock_daemon_run_socket_listen(req);
if (! status) {
return;
}
sock_daemon_run_wait(req);
sock_daemon_startup_notify(sockd);
}
static void sock_daemon_run_signal_handler(struct tevent_context *ev,
struct tevent_signal *se,
int signum, int count, void *siginfo,
void *private_data)
{
struct tevent_req *req = talloc_get_type_abort(
private_data, struct tevent_req);
struct sock_daemon_run_state *state = tevent_req_data(
req, struct sock_daemon_run_state);
D_NOTICE("Received signal %d\n", signum);
if (signum == SIGHUP || signum == SIGUSR1) {
sock_daemon_run_reconfigure(req);
return;
}
if (signum == SIGINT || signum == SIGTERM) {
state->exit_code = EINTR;
sock_daemon_run_shutdown(req);
}
}
static void sock_daemon_run_reconfigure(struct tevent_req *req)
{
struct tevent_req *subreq;
struct sock_daemon_run_state *state = tevent_req_data(
req, struct sock_daemon_run_state);
struct sock_daemon_context *sockd = state->sockd;
if (sockd->funcs != NULL && sockd->funcs->reconfigure_send != NULL &&
sockd->funcs->reconfigure_recv != NULL) {
subreq = sockd->funcs->reconfigure_send(state, state->ev,
sockd->private_data);
if (tevent_req_nomem(subreq, req)) {
return;
}
tevent_req_set_callback(subreq,
sock_daemon_run_reconfigure_done, req);
return;
}
if (sockd->funcs != NULL && sockd->funcs->reconfigure != NULL) {
int ret;
ret = sockd->funcs->reconfigure(sockd->private_data);
if (ret != 0) {
D_ERR("reconfigure failed, ret=%d\n", ret);
return;
}
D_NOTICE("reconfigure completed successfully\n");
}
}
static void sock_daemon_run_reconfigure_done(struct tevent_req *subreq)
{
struct tevent_req *req = tevent_req_callback_data(
subreq, struct tevent_req);
struct sock_daemon_run_state *state = tevent_req_data(
req, struct sock_daemon_run_state);
struct sock_daemon_context *sockd = state->sockd;
int ret;
bool status;
status = sockd->funcs->reconfigure_recv(subreq, &ret);
TALLOC_FREE(subreq);
if (! status) {
D_ERR("reconfigure failed, ret=%d\n", ret);
return;
}
D_NOTICE("reconfigure completed successfully\n");
}
static void sock_daemon_run_shutdown(struct tevent_req *req)
{
struct tevent_req *subreq;
struct sock_daemon_run_state *state = tevent_req_data(
req, struct sock_daemon_run_state);
struct sock_daemon_context *sockd = state->sockd;
struct sock_socket *sock;
D_NOTICE("Shutting down\n");
while ((sock = sockd->socket_list) != NULL) {
DLIST_REMOVE(sockd->socket_list, sock);
TALLOC_FREE(sock);
}
if (sockd->funcs != NULL && sockd->funcs->shutdown_send != NULL &&
sockd->funcs->shutdown_recv != NULL) {
subreq = sockd->funcs->shutdown_send(state, state->ev,
sockd->private_data);
if (subreq == NULL) {
sock_daemon_run_exit(req);
return;
}
tevent_req_set_callback(subreq, sock_daemon_run_shutdown_done,
req);
return;
}
if (sockd->funcs != NULL && sockd->funcs->shutdown != NULL) {
sockd->funcs->shutdown(sockd->private_data);
}
sock_daemon_run_exit(req);
}
static void sock_daemon_run_shutdown_done(struct tevent_req *subreq)
{
struct tevent_req *req = tevent_req_callback_data(
subreq, struct tevent_req);
struct sock_daemon_run_state *state = tevent_req_data(
req, struct sock_daemon_run_state);
struct sock_daemon_context *sockd = state->sockd;
sockd->funcs->shutdown_recv(subreq);
TALLOC_FREE(subreq);
sock_daemon_run_exit(req);
}
static void sock_daemon_run_exit(struct tevent_req *req)
{
struct sock_daemon_run_state *state = tevent_req_data(
req, struct sock_daemon_run_state);
struct sock_daemon_context *sockd = state->sockd;
TALLOC_FREE(sockd->pid_ctx);
if (state->exit_code == 0) {
tevent_req_done(req);
} else {
tevent_req_error(req, state->exit_code);
}
}
static bool sock_daemon_run_socket_listen(struct tevent_req *req)
{
struct tevent_req *subreq;
struct sock_daemon_run_state *state = tevent_req_data(
req, struct sock_daemon_run_state);
struct sock_daemon_context *sockd = state->sockd;
struct sock_socket *sock;
bool remove_before_use = false;
if (sockd->pid_ctx != NULL) {
remove_before_use = true;
}
for (sock = sockd->socket_list; sock != NULL; sock = sock->next) {
subreq = sock_socket_start_send(state, state->ev, sock,
remove_before_use);
if (tevent_req_nomem(subreq, req)) {
return false;
}
tevent_req_set_callback(subreq, sock_daemon_run_socket_fail,
req);
}
return true;
}
static void sock_daemon_run_socket_fail(struct tevent_req *subreq)
{
struct tevent_req *req = tevent_req_callback_data(
subreq, struct tevent_req);
struct sock_daemon_run_state *state = tevent_req_data(
req, struct sock_daemon_run_state);
const char *sockpath = NULL;
int ret = 0;
bool status;
status = sock_socket_start_recv(subreq, &ret, state, &sockpath);
TALLOC_FREE(subreq);
if (! status) {
D_ERR("socket %s closed unexpectedly\n", sockpath);
state->exit_code = ret;
} else {
state->exit_code = 0;
}
sock_daemon_run_shutdown(req);
}
static void sock_daemon_run_watch_pid(struct tevent_req *subreq)
{
struct tevent_req *req = tevent_req_callback_data(
subreq, struct tevent_req);
struct sock_daemon_run_state *state = tevent_req_data(
req, struct sock_daemon_run_state);
int ret;
bool status;
status = tevent_wakeup_recv(subreq);
TALLOC_FREE(subreq);
if (! status) {
tevent_req_error(req, EIO);
return;
}
ret = kill(state->pid_watch, 0);
if (ret == -1) {
if (errno == ESRCH) {
D_ERR("PID %d gone away, exiting\n", state->pid_watch);
state->exit_code = ESRCH;
sock_daemon_run_shutdown(req);
return;
} else {
D_ERR("Failed to check PID status %d, ret=%d\n",
state->pid_watch, errno);
}
}
subreq = tevent_wakeup_send(state, state->ev,
tevent_timeval_current_ofs(5,0));
if (tevent_req_nomem(subreq, req)) {
return;
}
tevent_req_set_callback(subreq, sock_daemon_run_watch_pid, req);
}
static void sock_daemon_run_wait(struct tevent_req *req)
{
struct tevent_req *subreq;
struct sock_daemon_run_state *state = tevent_req_data(
req, struct sock_daemon_run_state);
struct sock_daemon_context *sockd = state->sockd;
if (sockd->funcs != NULL && sockd->funcs->wait_send != NULL &&
sockd->funcs->wait_recv != NULL) {
subreq = sockd->funcs->wait_send(state, state->ev,
sockd->private_data);
if (tevent_req_nomem(subreq, req)) {
return;
}
tevent_req_set_callback(subreq, sock_daemon_run_wait_done,
req);
}
}
static void sock_daemon_run_wait_done(struct tevent_req *subreq)
{
struct tevent_req *req = tevent_req_callback_data(
subreq, struct tevent_req);
struct sock_daemon_run_state *state = tevent_req_data(
req, struct sock_daemon_run_state);
struct sock_daemon_context *sockd = state->sockd;
int ret = 0;
bool status;
status = sockd->funcs->wait_recv(subreq, &ret);
TALLOC_FREE(subreq);
if (! status) {
state->exit_code = ret;
} else {
state->exit_code = 0;
}
sock_daemon_run_shutdown(req);
}
static void sock_daemon_startup_notify(struct sock_daemon_context *sockd)
{
if (sockd->startup_fd != -1) {
unsigned int zero = 0;
ssize_t num;
num = sys_write(sockd->startup_fd, &zero, sizeof(zero));
if (num != sizeof(zero)) {
D_WARNING("Failed to write zero to pipe FD\n");
}
}
}
bool sock_daemon_run_recv(struct tevent_req *req, int *perr)
{
int ret;
if (tevent_req_is_unix_error(req, &ret)) {
if (perr != NULL) {
*perr = ret;
}
return false;
}
return true;
}
int sock_daemon_run(struct tevent_context *ev,
struct sock_daemon_context *sockd,
const char *pidfile,
bool do_fork, bool create_session,
pid_t pid_watch)
{
struct tevent_req *req;
int ret;
bool status;
req = sock_daemon_run_send(ev, ev, sockd,
pidfile, do_fork, create_session, pid_watch);
if (req == NULL) {
return ENOMEM;
}
tevent_req_poll(req, ev);
status = sock_daemon_run_recv(req, &ret);
TALLOC_FREE(req);
if (! status) {
return ret;
}
return 0;
}