void
fatal_signal_wait(void)
{
fatal_signal_init();
#ifdef _WIN32
poll_wevent_wait(wevent);
#else
poll_fd_wait(signal_fds[0], POLLIN);
#endif
}
/* Return 'true' if the Windows services manager has called the
* control_handler() and asked the program to terminate. */
bool
should_service_stop(void)
{
if (service_started) {
if (service_status.dwCurrentState != SERVICE_RUNNING) {
return true;
} else {
poll_wevent_wait(wevent);
}
}
return false;
}
/* Registers the call-back and configures the actions in case of a failure
* with the Windows services manager. */
void
service_start(int *argcp, char **argvp[])
{
int argc = *argcp;
char **argv = *argvp;
int i;
SERVICE_TABLE_ENTRY service_table[] = {
{(LPTSTR)program_name, (LPSERVICE_MAIN_FUNCTION)main},
{NULL, NULL}
};
/* If one of the command line option is "--detach", we create
* a new process in case of parent, wait for child to start and exit.
* In case of the child, we just return. We should not be creating a
* service in either case. */
if (detach_process(argc, argv)) {
return;
}
/* 'service_started' is 'false' when service_start() is called the first
* time. It is 'true', when it is called the second time by the Windows
* services manager. */
if (service_started) {
init_service_status();
wevent = CreateEvent(NULL, TRUE, FALSE, NULL);
if (!wevent) {
char *msg_buf = ovs_lasterror_to_string();
VLOG_FATAL("Failed to create a event (%s).", msg_buf);
}
poll_wevent_wait(wevent);
/* Register the control handler. This function is called by the service
* manager to stop the service. */
hstatus = RegisterServiceCtrlHandler(program_name,
(LPHANDLER_FUNCTION)control_handler);
if (!hstatus) {
char *msg_buf = ovs_lasterror_to_string();
VLOG_FATAL("Failed to register the service control handler (%s).",
msg_buf);
}
if (monitor) {
set_config_failure_actions();
}
/* When the service control manager does the call back, it does not
* send the same arguments as sent to the main function during the
* service start. So, use the arguments passed over during the first
* time. */
*argcp = sargc;
*argvp = *sargvp;
/* XXX: Windows implementation cannot have a unixctl commands in the
* traditional sense of unix domain sockets. If an implementation is
* done that involves 'unixctl' vlog commands the following call is
* needed to make sure that the unixctl commands for vlog get
* registered in a daemon, even before the first log message. */
vlog_init();
return;
}
assert_single_threaded();
/* A reference to arguments passed to the main function the first time.
* We need it after the call-back from service control manager. */
sargc = argc;
sargvp = argvp;
/* We are only interested in the '--service' and '--service-monitor'
* options before the call-back from the service control manager. */
for (i = 0; i < argc; i ++) {
if (!strcmp(argv[i], "--service")) {
service_create = true;
} else if (!strcmp(argv[i], "--service-monitor")) {
monitor = true;
}
}
/* If '--service' is not a command line option, run in foreground. */
if (!service_create) {
return;
}
/* If we have been configured to run as a service, then that service
* should already have been created either manually or through a start up
* script. */
check_service();
service_started = true;
/* StartServiceCtrlDispatcher blocks and returns after the service is
* stopped. */
if (!StartServiceCtrlDispatcher(service_table)) {
char *msg_buf = ovs_lasterror_to_string();
VLOG_FATAL("Failed at StartServiceCtrlDispatcher (%s)", msg_buf);
}
exit(0);
}