[PATCH] D14583: Report Windows error code in a fatal error after a system call

[Paul Robinson via cfe-commits]

probinson created this revision.
probinson added a reviewer: aaron.ballman.
probinson added a subscriber: cfe-commits.

We've had two reports in the past year that CryptAcquireContextW failed; but without the Windows error code it's hard to know what's going on.


http://reviews.llvm.org/D14583

Files:
  lib/Support/Windows/Process.inc

Index: lib/Support/Windows/Process.inc
===================================================================
--- lib/Support/Windows/Process.inc
+++ lib/Support/Windows/Process.inc
@@ -417,16 +417,23 @@
   return 0;
 }
 
+// Include GetLastError() in a fatal error message.
+static void ReportLastErrorFatal(const char *msg) {
+  std::string ErrMsg;
+  MakeErrMsg(&ErrMsg, msg);
+  report_fatal_error(ErrMsg);
+}
+
 unsigned Process::GetRandomNumber() {
   HCRYPTPROV HCPC;
   if (!::CryptAcquireContextW(&HCPC, NULL, NULL, PROV_RSA_FULL,
                               CRYPT_VERIFYCONTEXT))
-    report_fatal_error("Could not acquire a cryptographic context");
+    ReportLastErrorFatal("Could not acquire a cryptographic context");
 
   ScopedCryptContext CryptoProvider(HCPC);
   unsigned Ret;
   if (!::CryptGenRandom(CryptoProvider, sizeof(Ret),
                         reinterpret_cast<BYTE *>(&Ret)))
-    report_fatal_error("Could not generate a random number");
+    ReportLastErrorFatal("Could not generate a random number");
   return Ret;
 }


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