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308c243db5
curl/tests/server/util.c
Marc Hoersken 7dc8a981fa
tests/server/util.[ch]: add exit event to stop waiting on Windows 
This commit adds a global exit event to the test servers that
Windows-specific wait routines can use to get triggered if the
program was signaled to be terminated, eg. select_ws in sockfilt.c

The exit event will be managed by the signal handling code and is
set to not reset automatically to support multiple wait routines.

Reviewed-by: Jay Satiro
Closes #5260
2020-05-02 17:29:52 +02:00

837 lines
22 KiB
C
Raw Blame History

/***************************************************************************
* _ _ ____ _
* Project ___| | | | _ \| |
* / __| | | | |_) | |
* | (__| |_| | _ <| |___
* \___|\___/|_| \_\_____|
*
* Copyright (C) 1998 - 2020, Daniel Stenberg, <daniel@haxx.se>, et al.
*
* This software is licensed as described in the file COPYING, which
* you should have received as part of this distribution. The terms
* are also available at https://curl.haxx.se/docs/copyright.html.
*
* You may opt to use, copy, modify, merge, publish, distribute and/or sell
* copies of the Software, and permit persons to whom the Software is
* furnished to do so, under the terms of the COPYING file.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
***************************************************************************/
#include "server_setup.h"
#ifdef HAVE_SIGNAL_H
#include <signal.h>
#endif
#ifdef HAVE_NETINET_IN_H
#include <netinet/in.h>
#endif
#ifdef _XOPEN_SOURCE_EXTENDED
/* This define is "almost" required to build on HPUX 11 */
#include <arpa/inet.h>
#endif
#ifdef HAVE_NETDB_H
#include <netdb.h>
#endif
#ifdef HAVE_POLL_H
#include <poll.h>
#elif defined(HAVE_SYS_POLL_H)
#include <sys/poll.h>
#endif
#ifdef __MINGW32__
#include <w32api.h>
#endif
#define ENABLE_CURLX_PRINTF
/* make the curlx header define all printf() functions to use the curlx_*
versions instead */
#include "curlx.h" /* from the private lib dir */
#include "getpart.h"
#include "util.h"
#include "timeval.h"
#ifdef USE_WINSOCK
#undef EINTR
#define EINTR 4 /* errno.h value */
#undef EINVAL
#define EINVAL 22 /* errno.h value */
#endif
/* MinGW with w32api version < 3.6 declared in6addr_any as extern,
but lacked the definition */
#if defined(ENABLE_IPV6) && defined(__MINGW32__)
#if (__W32API_MAJOR_VERSION < 3) || \
((__W32API_MAJOR_VERSION == 3) && (__W32API_MINOR_VERSION < 6))
const struct in6_addr in6addr_any = {{ IN6ADDR_ANY_INIT }};
#endif /* w32api < 3.6 */
#endif /* ENABLE_IPV6 && __MINGW32__*/
static struct timeval tvnow(void);
/* This function returns a pointer to STATIC memory. It converts the given
* binary lump to a hex formatted string usable for output in logs or
* whatever.
*/
char *data_to_hex(char *data, size_t len)
{
static char buf[256*3];
size_t i;
char *optr = buf;
char *iptr = data;
if(len > 255)
len = 255;
for(i = 0; i < len; i++) {
if((data[i] >= 0x20) && (data[i] < 0x7f))
*optr++ = *iptr++;
else {
msnprintf(optr, 4, "%%%02x", *iptr++);
optr += 3;
}
}
*optr = 0; /* in case no sprintf was used */
return buf;
}
void logmsg(const char *msg, ...)
{
va_list ap;
char buffer[2048 + 1];
FILE *logfp;
struct timeval tv;
time_t sec;
struct tm *now;
char timebuf[20];
static time_t epoch_offset;
static int known_offset;
if(!serverlogfile) {
fprintf(stderr, "Error: serverlogfile not set\n");
return;
}
tv = tvnow();
if(!known_offset) {
epoch_offset = time(NULL) - tv.tv_sec;
known_offset = 1;
}
sec = epoch_offset + tv.tv_sec;
now = localtime(&sec); /* not thread safe but we don't care */
msnprintf(timebuf, sizeof(timebuf), "%02d:%02d:%02d.%06ld",
(int)now->tm_hour, (int)now->tm_min, (int)now->tm_sec,
(long)tv.tv_usec);
va_start(ap, msg);
mvsnprintf(buffer, sizeof(buffer), msg, ap);
va_end(ap);
logfp = fopen(serverlogfile, "ab");
if(logfp) {
fprintf(logfp, "%s %s\n", timebuf, buffer);
fclose(logfp);
}
else {
int error = errno;
fprintf(stderr, "fopen() failed with error: %d %s\n",
error, strerror(error));
fprintf(stderr, "Error opening file: %s\n", serverlogfile);
fprintf(stderr, "Msg not logged: %s %s\n", timebuf, buffer);
}
}
#ifdef WIN32
/* use instead of perror() on generic windows */
void win32_perror(const char *msg)
{
char buf[512];
DWORD err = SOCKERRNO;
if(!FormatMessageA((FORMAT_MESSAGE_FROM_SYSTEM |
FORMAT_MESSAGE_IGNORE_INSERTS), NULL, err,
LANG_NEUTRAL, buf, sizeof(buf), NULL))
msnprintf(buf, sizeof(buf), "Unknown error %lu (%#lx)", err, err);
if(msg)
fprintf(stderr, "%s: ", msg);
fprintf(stderr, "%s\n", buf);
}
#endif /* WIN32 */
#ifdef USE_WINSOCK
void win32_init(void)
{
WORD wVersionRequested;
WSADATA wsaData;
int err;
wVersionRequested = MAKEWORD(USE_WINSOCK, USE_WINSOCK);
err = WSAStartup(wVersionRequested, &wsaData);
if(err != 0) {
perror("Winsock init failed");
logmsg("Error initialising winsock -- aborting");
exit(1);
}
if(LOBYTE(wsaData.wVersion) != USE_WINSOCK ||
HIBYTE(wsaData.wVersion) != USE_WINSOCK) {
WSACleanup();
perror("Winsock init failed");
logmsg("No suitable winsock.dll found -- aborting");
exit(1);
}
}
void win32_cleanup(void)
{
WSACleanup();
}
#endif /* USE_WINSOCK */
/* set by the main code to point to where the test dir is */
const char *path = ".";
FILE *test2fopen(long testno)
{
FILE *stream;
char filename[256];
/* first try the alternative, preprocessed, file */
msnprintf(filename, sizeof(filename), ALTTEST_DATA_PATH, ".", testno);
stream = fopen(filename, "rb");
if(stream)
return stream;
/* then try the source version */
msnprintf(filename, sizeof(filename), TEST_DATA_PATH, path, testno);
stream = fopen(filename, "rb");
return stream;
}
/*
* Portable function used for waiting a specific amount of ms.
* Waiting indefinitely with this function is not allowed, a
* zero or negative timeout value will return immediately.
*
* Return values:
* -1 = system call error, or invalid timeout value
* 0 = specified timeout has elapsed
*/
int wait_ms(int timeout_ms)
{
#if !defined(MSDOS) && !defined(USE_WINSOCK)
#ifndef HAVE_POLL_FINE
struct timeval pending_tv;
#endif
struct timeval initial_tv;
int pending_ms;
#endif
int r = 0;
if(!timeout_ms)
return 0;
if(timeout_ms < 0) {
errno = EINVAL;
return -1;
}
#if defined(MSDOS)
delay(timeout_ms);
#elif defined(USE_WINSOCK)
Sleep(timeout_ms);
#else
pending_ms = timeout_ms;
initial_tv = tvnow();
do {
int error;
#if defined(HAVE_POLL_FINE)
r = poll(NULL, 0, pending_ms);
#else
pending_tv.tv_sec = pending_ms / 1000;
pending_tv.tv_usec = (pending_ms % 1000) * 1000;
r = select(0, NULL, NULL, NULL, &pending_tv);
#endif /* HAVE_POLL_FINE */
if(r != -1)
break;
error = errno;
if(error && (error != EINTR))
break;
pending_ms = timeout_ms - (int)timediff(tvnow(), initial_tv);
if(pending_ms <= 0)
break;
} while(r == -1);
#endif /* USE_WINSOCK */
if(r)
r = -1;
return r;
}
int write_pidfile(const char *filename)
{
FILE *pidfile;
curl_off_t pid;
pid = (curl_off_t)getpid();
pidfile = fopen(filename, "wb");
if(!pidfile) {
logmsg("Couldn't write pid file: %s %s", filename, strerror(errno));
return 0; /* fail */
}
#if defined(WIN32) || defined(_WIN32)
/* store pid + 65536 to avoid conflict with Cygwin/msys PIDs, see also:
* - https://cygwin.com/git/?p=newlib-cygwin.git;a=commit; ↵
* h=b5e1003722cb14235c4f166be72c09acdffc62ea
* - https://cygwin.com/git/?p=newlib-cygwin.git;a=commit; ↵
* h=448cf5aa4b429d5a9cebf92a0da4ab4b5b6d23fe
*/
pid += 65536;
#endif
fprintf(pidfile, "%" CURL_FORMAT_CURL_OFF_T "\n", pid);
fclose(pidfile);
logmsg("Wrote pid %ld to %s", pid, filename);
return 1; /* success */
}
/* store the used port number in a file */
int write_portfile(const char *filename, int port)
{
FILE *portfile = fopen(filename, "wb");
if(!portfile) {
logmsg("Couldn't write port file: %s %s", filename, strerror(errno));
return 0; /* fail */
}
fprintf(portfile, "%d\n", port);
fclose(portfile);
logmsg("Wrote port %d to %s", port, filename);
return 1; /* success */
}
void set_advisor_read_lock(const char *filename)
{
FILE *lockfile;
int error = 0;
int res;
do {
lockfile = fopen(filename, "wb");
} while((lockfile == NULL) && ((error = errno) == EINTR));
if(lockfile == NULL) {
logmsg("Error creating lock file %s error: %d %s",
filename, error, strerror(error));
return;
}
do {
res = fclose(lockfile);
} while(res && ((error = errno) == EINTR));
if(res)
logmsg("Error closing lock file %s error: %d %s",
filename, error, strerror(error));
}
void clear_advisor_read_lock(const char *filename)
{
int error = 0;
int res;
/*
** Log all removal failures. Even those due to file not existing.
** This allows to detect if unexpectedly the file has already been
** removed by a process different than the one that should do this.
*/
do {
res = unlink(filename);
} while(res && ((error = errno) == EINTR));
if(res)
logmsg("Error removing lock file %s error: %d %s",
filename, error, strerror(error));
}
/* Portable, consistent toupper (remember EBCDIC). Do not use toupper() because
its behavior is altered by the current locale. */
static char raw_toupper(char in)
{
#if !defined(CURL_DOES_CONVERSIONS)
if(in >= 'a' && in <= 'z')
return (char)('A' + in - 'a');
#else
switch(in) {
case 'a':
return 'A';
case 'b':
return 'B';
case 'c':
return 'C';
case 'd':
return 'D';
case 'e':
return 'E';
case 'f':
return 'F';
case 'g':
return 'G';
case 'h':
return 'H';
case 'i':
return 'I';
case 'j':
return 'J';
case 'k':
return 'K';
case 'l':
return 'L';
case 'm':
return 'M';
case 'n':
return 'N';
case 'o':
return 'O';
case 'p':
return 'P';
case 'q':
return 'Q';
case 'r':
return 'R';
case 's':
return 'S';
case 't':
return 'T';
case 'u':
return 'U';
case 'v':
return 'V';
case 'w':
return 'W';
case 'x':
return 'X';
case 'y':
return 'Y';
case 'z':
return 'Z';
}
#endif
return in;
}
int strncasecompare(const char *first, const char *second, size_t max)
{
while(*first && *second && max) {
if(raw_toupper(*first) != raw_toupper(*second)) {
break;
}
max--;
first++;
second++;
}
if(0 == max)
return 1; /* they are equal this far */
return raw_toupper(*first) == raw_toupper(*second);
}
#if defined(WIN32) && !defined(MSDOS)
static struct timeval tvnow(void)
{
/*
** GetTickCount() is available on _all_ Windows versions from W95 up
** to nowadays. Returns milliseconds elapsed since last system boot,
** increases monotonically and wraps once 49.7 days have elapsed.
**
** GetTickCount64() is available on Windows version from Windows Vista
** and Windows Server 2008 up to nowadays. The resolution of the
** function is limited to the resolution of the system timer, which
** is typically in the range of 10 milliseconds to 16 milliseconds.
*/
struct timeval now;
#if defined(_WIN32_WINNT) && (_WIN32_WINNT >= 0x0600) && \
(!defined(__MINGW32__) || defined(__MINGW64_VERSION_MAJOR))
ULONGLONG milliseconds = GetTickCount64();
#else
DWORD milliseconds = GetTickCount();
#endif
now.tv_sec = (long)(milliseconds / 1000);
now.tv_usec = (long)((milliseconds % 1000) * 1000);
return now;
}
#elif defined(HAVE_CLOCK_GETTIME_MONOTONIC)
static struct timeval tvnow(void)
{
/*
** clock_gettime() is granted to be increased monotonically when the
** monotonic clock is queried. Time starting point is unspecified, it
** could be the system start-up time, the Epoch, or something else,
** in any case the time starting point does not change once that the
** system has started up.
*/
struct timeval now;
struct timespec tsnow;
if(0 == clock_gettime(CLOCK_MONOTONIC, &tsnow)) {
now.tv_sec = tsnow.tv_sec;
now.tv_usec = tsnow.tv_nsec / 1000;
}
/*
** Even when the configure process has truly detected monotonic clock
** availability, it might happen that it is not actually available at
** run-time. When this occurs simply fallback to other time source.
*/
#ifdef HAVE_GETTIMEOFDAY
else
(void)gettimeofday(&now, NULL);
#else
else {
now.tv_sec = (long)time(NULL);
now.tv_usec = 0;
}
#endif
return now;
}
#elif defined(HAVE_GETTIMEOFDAY)
static struct timeval tvnow(void)
{
/*
** gettimeofday() is not granted to be increased monotonically, due to
** clock drifting and external source time synchronization it can jump
** forward or backward in time.
*/
struct timeval now;
(void)gettimeofday(&now, NULL);
return now;
}
#else
static struct timeval tvnow(void)
{
/*
** time() returns the value of time in seconds since the Epoch.
*/
struct timeval now;
now.tv_sec = (long)time(NULL);
now.tv_usec = 0;
return now;
}
#endif
long timediff(struct timeval newer, struct timeval older)
{
timediff_t diff = newer.tv_sec-older.tv_sec;
if(diff >= (LONG_MAX/1000))
return LONG_MAX;
else if(diff <= (LONG_MIN/1000))
return LONG_MIN;
return (long)(newer.tv_sec-older.tv_sec)*1000+
(long)(newer.tv_usec-older.tv_usec)/1000;
}
/* do-nothing macro replacement for systems which lack siginterrupt() */
#ifndef HAVE_SIGINTERRUPT
#define siginterrupt(x,y) do {} while(0)
#endif
/* vars used to keep around previous signal handlers */
typedef RETSIGTYPE (*SIGHANDLER_T)(int);
#ifdef SIGHUP
static SIGHANDLER_T old_sighup_handler = SIG_ERR;
#endif
#ifdef SIGPIPE
static SIGHANDLER_T old_sigpipe_handler = SIG_ERR;
#endif
#ifdef SIGALRM
static SIGHANDLER_T old_sigalrm_handler = SIG_ERR;
#endif
#ifdef SIGINT
static SIGHANDLER_T old_sigint_handler = SIG_ERR;
#endif
#ifdef SIGTERM
static SIGHANDLER_T old_sigterm_handler = SIG_ERR;
#endif
#if defined(SIGBREAK) && defined(WIN32)
static SIGHANDLER_T old_sigbreak_handler = SIG_ERR;
#endif
#ifdef WIN32
static DWORD thread_main_id = 0;
static HANDLE thread_main_window = NULL;
static HWND hidden_main_window = NULL;
#endif
/* var which if set indicates that the program should finish execution */
volatile int got_exit_signal = 0;
/* if next is set indicates the first signal handled in exit_signal_handler */
volatile int exit_signal = 0;
#ifdef WIN32
/* event which if set indicates that the program should finish */
HANDLE exit_event = NULL;
#endif
/* signal handler that will be triggered to indicate that the program
* should finish its execution in a controlled manner as soon as possible.
* The first time this is called it will set got_exit_signal to one and
* store in exit_signal the signal that triggered its execution.
*/
static RETSIGTYPE exit_signal_handler(int signum)
{
int old_errno = errno;
logmsg("exit_signal_handler: %d", signum);
if(got_exit_signal == 0) {
got_exit_signal = 1;
exit_signal = signum;
#ifdef WIN32
if(exit_event)
(void)SetEvent(exit_event);
#endif
}
(void)signal(signum, exit_signal_handler);
errno = old_errno;
}
#ifdef WIN32
/* CTRL event handler for Windows Console applications to simulate
* SIGINT, SIGTERM and SIGBREAK on CTRL events and trigger signal handler.
*
* Background information from MSDN:
* SIGINT is not supported for any Win32 application. When a CTRL+C
* interrupt occurs, Win32 operating systems generate a new thread
* to specifically handle that interrupt. This can cause a single-thread
* application, such as one in UNIX, to become multithreaded and cause
* unexpected behavior.
* [...]
* The SIGILL and SIGTERM signals are not generated under Windows.
* They are included for ANSI compatibility. Therefore, you can set
* signal handlers for these signals by using signal, and you can also
* explicitly generate these signals by calling raise. Source:
* https://docs.microsoft.com/de-de/cpp/c-runtime-library/reference/signal
*/
static BOOL WINAPI ctrl_event_handler(DWORD dwCtrlType)
{
int signum = 0;
logmsg("ctrl_event_handler: %d", dwCtrlType);
switch(dwCtrlType) {
#ifdef SIGINT
case CTRL_C_EVENT: signum = SIGINT; break;
#endif
#ifdef SIGTERM
case CTRL_CLOSE_EVENT: signum = SIGTERM; break;
#endif
#ifdef SIGBREAK
case CTRL_BREAK_EVENT: signum = SIGBREAK; break;
#endif
default: return FALSE;
}
if(signum) {
logmsg("ctrl_event_handler: %d -> %d", dwCtrlType, signum);
raise(signum);
}
return TRUE;
}
/* Window message handler for Windows applications to add support
* for graceful process termination via taskkill (without /f) which
* sends WM_CLOSE to all Windows of a process (even hidden ones).
*
* Therefore we create and run a hidden Window in a separate thread
* to receive and handle the WM_CLOSE message as SIGTERM signal.
*/
static LRESULT CALLBACK main_window_proc(HWND hwnd, UINT uMsg,
WPARAM wParam, LPARAM lParam)
{
int signum = 0;
if(hwnd == hidden_main_window) {
switch(uMsg) {
#ifdef SIGTERM
case WM_CLOSE: signum = SIGTERM; break;
#endif
case WM_DESTROY: PostQuitMessage(0); break;
}
if(signum) {
logmsg("main_window_proc: %d -> %d", uMsg, signum);
raise(signum);
}
}
return DefWindowProc(hwnd, uMsg, wParam, lParam);
}
/* Window message queue loop for hidden main window, details see above.
*/
static DWORD WINAPI main_window_loop(LPVOID lpParameter)
{
WNDCLASS wc;
BOOL ret;
MSG msg;
ZeroMemory(&wc, sizeof(wc));
wc.lpfnWndProc = (WNDPROC)main_window_proc;
wc.hInstance = (HINSTANCE)lpParameter;
wc.lpszClassName = "MainWClass";
if(!RegisterClass(&wc)) {
perror("RegisterClass failed");
return (DWORD)-1;
}
hidden_main_window = CreateWindowEx(0, "MainWClass", "Recv WM_CLOSE msg",
WS_OVERLAPPEDWINDOW,
CW_USEDEFAULT, CW_USEDEFAULT,
CW_USEDEFAULT, CW_USEDEFAULT,
(HWND)NULL, (HMENU)NULL,
wc.hInstance, (LPVOID)NULL);
if(!hidden_main_window) {
perror("CreateWindowEx failed");
return (DWORD)-1;
}
do {
ret = GetMessage(&msg, NULL, 0, 0);
if(ret == -1) {
perror("GetMessage failed");
return (DWORD)-1;
}
else if(ret) {
if(msg.message == WM_APP) {
DestroyWindow(hidden_main_window);
}
else if(msg.hwnd && !TranslateMessage(&msg)) {
DispatchMessage(&msg);
}
}
} while(ret);
hidden_main_window = NULL;
return (DWORD)msg.wParam;
}
#endif
void install_signal_handlers(bool keep_sigalrm)
{
#ifdef WIN32
/* setup windows exit event before any signal can trigger */
exit_event = CreateEvent(NULL, TRUE, FALSE, NULL);
if(!exit_event)
logmsg("cannot create exit event");
#endif
#ifdef SIGHUP
/* ignore SIGHUP signal */
old_sighup_handler = signal(SIGHUP, SIG_IGN);
if(old_sighup_handler == SIG_ERR)
logmsg("cannot install SIGHUP handler: %s", strerror(errno));
#endif
#ifdef SIGPIPE
/* ignore SIGPIPE signal */
old_sigpipe_handler = signal(SIGPIPE, SIG_IGN);
if(old_sigpipe_handler == SIG_ERR)
logmsg("cannot install SIGPIPE handler: %s", strerror(errno));
#endif
#ifdef SIGALRM
if(!keep_sigalrm) {
/* ignore SIGALRM signal */
old_sigalrm_handler = signal(SIGALRM, SIG_IGN);
if(old_sigalrm_handler == SIG_ERR)
logmsg("cannot install SIGALRM handler: %s", strerror(errno));
}
#else
(void)keep_sigalrm;
#endif
#ifdef SIGINT
/* handle SIGINT signal with our exit_signal_handler */
old_sigint_handler = signal(SIGINT, exit_signal_handler);
if(old_sigint_handler == SIG_ERR)
logmsg("cannot install SIGINT handler: %s", strerror(errno));
else
siginterrupt(SIGINT, 1);
#endif
#ifdef SIGTERM
/* handle SIGTERM signal with our exit_signal_handler */
old_sigterm_handler = signal(SIGTERM, exit_signal_handler);
if(old_sigterm_handler == SIG_ERR)
logmsg("cannot install SIGTERM handler: %s", strerror(errno));
else
siginterrupt(SIGTERM, 1);
#endif
#if defined(SIGBREAK) && defined(WIN32)
/* handle SIGBREAK signal with our exit_signal_handler */
old_sigbreak_handler = signal(SIGBREAK, exit_signal_handler);
if(old_sigbreak_handler == SIG_ERR)
logmsg("cannot install SIGBREAK handler: %s", strerror(errno));
else
siginterrupt(SIGBREAK, 1);
#endif
#ifdef WIN32
if(!SetConsoleCtrlHandler(ctrl_event_handler, TRUE))
logmsg("cannot install CTRL event handler");
thread_main_window = CreateThread(NULL, 0,
&main_window_loop,
(LPVOID)GetModuleHandle(NULL),
0, &thread_main_id);
if(!thread_main_window || !thread_main_id)
logmsg("cannot start main window loop");
#endif
}
void restore_signal_handlers(bool keep_sigalrm)
{
#ifdef SIGHUP
if(SIG_ERR != old_sighup_handler)
(void)signal(SIGHUP, old_sighup_handler);
#endif
#ifdef SIGPIPE
if(SIG_ERR != old_sigpipe_handler)
(void)signal(SIGPIPE, old_sigpipe_handler);
#endif
#ifdef SIGALRM
if(!keep_sigalrm) {
if(SIG_ERR != old_sigalrm_handler)
(void)signal(SIGALRM, old_sigalrm_handler);
}
#else
(void)keep_sigalrm;
#endif
#ifdef SIGINT
if(SIG_ERR != old_sigint_handler)
(void)signal(SIGINT, old_sigint_handler);
#endif
#ifdef SIGTERM
if(SIG_ERR != old_sigterm_handler)
(void)signal(SIGTERM, old_sigterm_handler);
#endif
#if defined(SIGBREAK) && defined(WIN32)
if(SIG_ERR != old_sigbreak_handler)
(void)signal(SIGBREAK, old_sigbreak_handler);
#endif
#ifdef WIN32
(void)SetConsoleCtrlHandler(ctrl_event_handler, FALSE);
if(thread_main_window && thread_main_id) {
if(PostThreadMessage(thread_main_id, WM_APP, 0, 0)) {
if(WaitForSingleObjectEx(thread_main_window, INFINITE, TRUE)) {
if(CloseHandle(thread_main_window)) {
thread_main_window = NULL;
thread_main_id = 0;
}
}
}
}
if(exit_event) {
if(CloseHandle(exit_event)) {
exit_event = NULL;
}
}
#endif
}
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