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tests/server: add CTRL event handler for Win32 consoles

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Forward CTRL events as signals to existing signal event handler.
This commit is contained in:
Marc Hoersken 2020-04-11 23:31:55 +02:00
parent 9869f6dc5a
commit 30c8ef7d63
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GPG Key ID: 61E03CBED7BC859E
1 changed files with 48 additions and 0 deletions
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48
tests/server/util.c
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@ -567,6 +567,47 @@ static RETSIGTYPE exit_signal_handler(int signum)
errno = old_errno; 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);
exit_signal_handler(signum);
}
return TRUE;
}
#endif
void install_signal_handlers(bool keep_sigalrm) void install_signal_handlers(bool keep_sigalrm)
{ {
#ifdef SIGHUP #ifdef SIGHUP
@ -615,6 +656,10 @@ void install_signal_handlers(bool keep_sigalrm)
else else
siginterrupt(SIGBREAK, 1); siginterrupt(SIGBREAK, 1);
#endif #endif
#ifdef WIN32
if(!SetConsoleCtrlHandler(ctrl_event_handler, TRUE))
logmsg("cannot install CTRL event handler");
#endif
} }
void restore_signal_handlers(bool keep_sigalrm) void restore_signal_handlers(bool keep_sigalrm)
@ -647,4 +692,7 @@ void restore_signal_handlers(bool keep_sigalrm)
if(SIG_ERR != old_sigbreak_handler) if(SIG_ERR != old_sigbreak_handler)
(void)signal(SIGBREAK, old_sigbreak_handler); (void)signal(SIGBREAK, old_sigbreak_handler);
#endif #endif
#ifdef WIN32
(void)SetConsoleCtrlHandler(ctrl_event_handler, FALSE);
#endif
} }