[gnurl] 169/264: tests/server: add CTRL event handler for Win32 consoles

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nikita pushed a commit to branch master
in repository gnurl.

commit 30c8ef7d636ea060e690b4959280d05f2587d882
Author: Marc Hoersken <address@hidden>
AuthorDate: Sat Apr 11 23:31:55 2020 +0200

    tests/server: add CTRL event handler for Win32 consoles
    
    Forward CTRL events as signals to existing signal event handler.
---
 tests/server/util.c | 48 ++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 48 insertions(+)

diff --git a/tests/server/util.c b/tests/server/util.c
index 5dd4e0a7f..c8bc32945 100644
--- a/tests/server/util.c
+++ b/tests/server/util.c
@@ -567,6 +567,47 @@ static RETSIGTYPE exit_signal_handler(int signum)
   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)
 {
 #ifdef SIGHUP
@@ -615,6 +656,10 @@ void install_signal_handlers(bool keep_sigalrm)
   else
     siginterrupt(SIGBREAK, 1);
 #endif
+#ifdef WIN32
+  if(!SetConsoleCtrlHandler(ctrl_event_handler, TRUE))
+    logmsg("cannot install CTRL event handler");
+#endif
 }
 
 void restore_signal_handlers(bool keep_sigalrm)
@@ -647,4 +692,7 @@ void restore_signal_handlers(bool keep_sigalrm)
   if(SIG_ERR != old_sigbreak_handler)
     (void)signal(SIGBREAK, old_sigbreak_handler);
 #endif
+#ifdef WIN32
+  (void)SetConsoleCtrlHandler(ctrl_event_handler, FALSE);
+#endif
 }

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