curl tests: updated select() error handling, file doxy

Tests reports now about unexpected errors from select() and
source code line number to simplify problematic position
locating.
Used much smaller timeout on W32 if system is doing some
sockets data processing in other threads.

1 files changed, 21 insertions, 6 deletions

diff --git a/src/testcurl/test_post_loop.c b/src/testcurl/test_post_loop.c
index 0c8bf202..927c867b 100644
--- a/src/testcurl/test_post_loop.c
+++ b/src/testcurl/test_post_loop.c
@@ -1,6 +1,7 @@
 /*
      This file is part of libmicrohttpd
      Copyright (C) 2007 Christian Grothoff
+     Copyright (C) 2014-2021 Evgeny Grin (Karlson2k)
 
      libmicrohttpd is free software; you can redistribute it and/or modify
      it under the terms of the GNU General Public License as published
@@ -22,6 +23,7 @@
  * @file daemontest_post_loop.c
  * @brief  Testcase for libmicrohttpd POST operations using URL-encoding
  * @author Christian Grothoff (inspired by bug report #1296)
+ * @author Karlson2k (Evgeny Grin)
  */
 
 #include "MHD_config.h"
@@ -525,12 +527,25 @@ testExternalPost ()
       tv.tv_usec = (timeout % 1000) * 1000;
       if (-1 == select (maxposixs + 1, &rs, &ws, &es, &tv))
       {
-        if (EINTR == errno)
-          continue;
-        fprintf (stderr,
-                 "select failed: %s\n",
-                 strerror (errno));
-        break;
+#ifdef MHD_POSIX_SOCKETS
+        if (EINTR != errno)
+        {
+          fprintf (stderr, "Unexpected select() error: %d. Line: %d\n",
+                   (int) errno, __LINE__);
+          fflush (stderr);
+          exit (99);
+        }
+#else
+        if ((WSAEINVAL != WSAGetLastError ()) ||
+            (0 != rs.fd_count) || (0 != ws.fd_count) || (0 != es.fd_count) )
+        {
+          fprintf (stderr, "Unexpected select() error: %d. Line: %d\n",
+                   (int) WSAGetLastError (), __LINE__);
+          fflush (stderr);
+          exit (99);
+        }
+        Sleep (1);
+#endif
       }
       while (CURLM_CALL_MULTI_PERFORM ==
              curl_multi_perform (multi, &running))