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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
using Microsoft.Win32.SafeHandles;
namespace System.Diagnostics
{
public static partial class Debug
{
private static readonly bool s_shouldWriteToStdErr = Environment.GetEnvironmentVariable("COMPlus_DebugWriteToStdErr") == "1";
private static void ShowAssertDialog(string stackTrace, string message, string detailMessage)
{
if (Debugger.IsAttached)
{
Debugger.Break();
}
else
{
// In Core, we do not show a dialog.
// Fail in order to avoid anyone catching an exception and masking
// an assert failure.
var ex = new DebugAssertException(message, detailMessage, stackTrace);
Environment.FailFast(ex.Message, ex);
}
}
private static void WriteCore(string message)
{
WriteToDebugger(message);
if (s_shouldWriteToStdErr)
{
WriteToStderr(message);
}
}
private static void WriteToDebugger(string message)
{
if (Debugger.IsLogging())
{
Debugger.Log(0, null, message);
}
else
{
Interop.Sys.SysLog(Interop.Sys.SysLogPriority.LOG_USER | Interop.Sys.SysLogPriority.LOG_DEBUG, "%s", message);
}
}
private static void WriteToStderr(string message)
{
// We don't want to write UTF-16 to a file like standard error. Ideally we would transcode this
// to UTF8, but the downside of that is it pulls in a bunch of stuff into what is ideally
// a path with minimal dependencies (as to prevent re-entrency), so we'll take the strategy
// of just throwing away any non ASCII characters from the message and writing the rest
const int BufferLength = 256;
unsafe
{
byte* buf = stackalloc byte[BufferLength];
int bufCount;
int i = 0;
while (i < message.Length)
{
for (bufCount = 0; bufCount < BufferLength && i < message.Length; i++)
{
if (message[i] <= 0x7F)
{
buf[bufCount] = (byte)message[i];
bufCount++;
}
}
int totalBytesWritten = 0;
while (bufCount > 0)
{
int bytesWritten = Interop.Sys.Write(2 /* stderr */, buf + totalBytesWritten, bufCount);
if (bytesWritten < 0)
{
// On error, simply stop writing the debug output. This could commonly happen if stderr
// was piped to a program that ended before this program did, resulting in EPIPE errors.
return;
}
bufCount -= bytesWritten;
totalBytesWritten += bytesWritten;
}
}
}
}
}
}
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