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/* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* Fluent Bit
* ==========
* Copyright (C) 2019-2020 The Fluent Bit Authors
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <Windows.h>
#include <Shlwapi.h>
struct flb_config;
extern struct flb_config *config;
extern int flb_engine_exit(struct flb_config*);
extern int flb_main(int, char**);
/* Windows Service utils */
#define svc_name "fluent-bit"
static SERVICE_STATUS_HANDLE hstatus;
static int win32_argc;
static char **win32_argv;
/*
* A Windows Service uses 'C:\Windows\System32' as working directory
* by default. Here we use a more intuitive default path (where
* fluent-bit.exe exists).
*/
static int update_default_workdir(void)
{
char path[MAX_PATH];
if (win32_argc < 1) {
return -1;
}
if (strcpy_s(path, MAX_PATH, win32_argv[0])) {
return -1;
}
if (!PathRemoveFileSpecA(path)) {
return -1;
}
if (!SetCurrentDirectoryA(path)) {
return -1;
}
return 0;
}
static void svc_notify(DWORD status)
{
SERVICE_STATUS ss;
ss.dwServiceType = SERVICE_WIN32_OWN_PROCESS;
ss.dwCurrentState = status;
ss.dwWin32ExitCode = NO_ERROR;
ss.dwServiceSpecificExitCode = NO_ERROR;
ss.dwControlsAccepted = SERVICE_ACCEPT_STOP;
ss.dwWaitHint = 30000;
ss.dwCheckPoint = 0;
/*
* According to MSDN (SetServiceStatus), accepting control on
* SERVICE_START_PENDING can crash the service.
*/
if (status == SERVICE_START_PENDING) {
ss.dwControlsAccepted = 0;
}
SetServiceStatus(hstatus, &ss);
}
static void WINAPI svc_handler(DWORD ctrl)
{
switch (ctrl)
{
case SERVICE_CONTROL_STOP:
svc_notify(SERVICE_STOP_PENDING);
flb_engine_exit(config);
return;
default:
break;
}
}
static void WINAPI svc_main(DWORD svc_argc, LPTSTR *svc_argv)
{
hstatus = RegisterServiceCtrlHandler(svc_name, svc_handler);
if (!hstatus) {
return;
}
update_default_workdir();
svc_notify(SERVICE_START_PENDING);
flb_main(win32_argc, win32_argv);
svc_notify(SERVICE_STOPPED);
}
/*
* Notify SCM that Fluent Bit is running.
*
* Note: Call this function in the main execution flow (immediately
* before the engine is starting).
*/
void win32_started(void)
{
if (hstatus) {
svc_notify(SERVICE_RUNNING);
}
}
static const SERVICE_TABLE_ENTRY svc_table[] = {
{svc_name, svc_main},
{NULL, NULL}
};
int win32_main(int argc, char **argv)
{
win32_argc = argc;
win32_argv = argv;
if (StartServiceCtrlDispatcher(svc_table)) {
return 0;
}
if (GetLastError() != ERROR_FAILED_SERVICE_CONTROLLER_CONNECT) {
return -1;
}
/*
* If we cannot connect to SCM, we assume that "fluent-bit.exe"
* was invoked from the command line.
*/
return flb_main(argc, argv);
}
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