trace | 易学教程

How does ltrace (library tracing tool) work?

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How ltrace works? How does it find out that program's calling library functions? Is there any common code path that all calls to library functions come through? Maybe ltrace is setting breakpoint in this common code path? Thanks! Dynamic executables have a symbol table used by the linker when resolving references that need to be connected to library functions. (You can see this yourself by running objdump -T /path/to/binary ). This symbol table is accessible by other tools -- such as ltrace -- as well, so it's trivial to determine which functions need to be hooked and walk that list

Visual Studio 2008: How to redirect Trace, Debug and Console output to the Output window?

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I have noticed recently that the Visual Studio "Output window" stopped writing out my Debug.WriteLine messages in my WinForms application. It does neither output the Trace.WriteLine messages. I have also used DebugView while running this application and it shows nothing. I am sure it worked in some VS projects some time ago - the output contained Debug messages. We also have a project that we regularly debug in production using the DebugView tool and it shows all Trace.WriteLine messages. However, I just found out that currently in my Visual Studio, Console.WriteLine now writes to the VS

How to get tracing info for binding variables passed through OracleParameter in ODP.NET?

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问题 After Googling a lot and not finding what I'm looking for I decided to ask this question. I'm using binding variables as demonstrated in this awesome article from 2005 titled The Values That Bind by Mark A. Williams, like this: OracleParameter p_APP_NAME = new OracleParameter("p_APP_NAME", OracleDbType.NVarchar2, ParameterDirection.Input); p_APP_NAME.Size = 50; p_APP_NAME.Value = log.Application.Name; cmd.Parameters.Add(p_APP_NAME); I successfully enabled ODP.NET debug tracing but one key

IIS/ASP.net error for failed request tracing: “a failed request trace for this content already exists”

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问题 I am trying to add Failed Request Tracing to my IIS 7/ASP.NET server. First, I create failed request tracing for " all content, error codes 400-999 " because want to save all errors. Then, I try to create a trace for " all content, time: 5 seconds " because I want to trace all "long" requests. However, IIS 7 gives me an error : "A failed request trace for this content already exists". How can I add this second trace for all content that takes > 5 seconds? 回答1: In your web.config the Failed

Java embedded jetty is accepting HTTP TRACE method

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问题 I'm trying to disable HTTP TRACE method in embedded Jetty. In Jetty doc's is info that HTTP trace is disabled by default, but for embedded it is still enabled. I was trying to disable trace as a security constraint as is done in jetty.xml. ServletContextHandler servletHandler = new ServletContextHandler(ServletContextHandler.SESSIONS | ServletContextHandler.SECURITY); servletHandler.setClassLoader(Server.class.getClassLoader()); servletHandler.setContextPath("/"); servletHandler

ASP.NET and System.Diagnostics tracing - have I missed something, or is this a bad idea?

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问题 For various common reasons I wanted to use tracing for my ASP.NET application. Especially since I found out about the possibility to use the Service Trace Viewer tool which allows you to examine your traces in a powerful way. Since I had never used this trace thing before, I started stuying it. After a while of Google, SO and MSDN I finally have a good idea of how things work. But I also found one very distrubing thing. When using trace in ASP.NET applications it makes a lot of sense to group

react-native profiling doesn't show JS thread

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I followed the official guide to profile my JS: https://facebook.github.io/react-native/docs/android-ui-performance.html But when I get the results, there's no js-related code I can look at: Any idea what happened ? The interface is pretty sluggish, cusuming 100% of a CPU, but I get no infos why. EDIT: looks like using the latest react-native version could solve that, I'm using 0.30.0 and looks like some related changes were introduced around 0.34.0 You can simply use the chrome profiler over debuggerWorker.js while debugging: Profiling while debugging won't give you the most accurate results

Does the .Net TraceSource/TraceListener framework have something similar to log4net's Formatters?

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问题 I've begun to the the built-in TraceSource and TraceListener classes and I would like to modify the output format of the events independently of the TraceSources and TraceListeners. It seems that the TraceListeners apply their own formatting. Is it possible to completely change the formatting without creating a new class for each and every TraceListener I use? 回答1: The Enterprise Library Logging Application Block (http://msdn.microsoft.com/en-us/library/cc309506.aspx) is built on the .Net

Does ftrace allow capture of system call arguments to the Linux kernel, or only function names?

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问题 The goal is to examine arguments passed to specific system calls (e.g. exec, open, etc.) by any process. From the official documentation, no capability to log function arguments is described (looked mostly at the "function" tracer, as I don't need the graph). I wanted to make sure I'm not overlooking something and wasting time using something more exotic if I could actually do this within the framework of ftrace. 回答1: I have limited experience with ftrace , although I have used it for for

How to save trace info into a file

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I am tracing my ASPX page by enabling tracing in web.config ( <trace enabled="true" pageOutput="true"/> ) How could i save this information (specifically the request headers) into a log file. Thanks for sharing your valuable time. Simply enabling tracing the way your have is not enough - you need to configure what to trace and what to do with the trace. See Trace Listeners and Configuring Tracing on MSDN. Check the below link which show various options of tracing http://www.codeproject.com/Articles/82290/Step-by-Step-Guide-to-Trace-the-ASP-NET-Applicatio foreach (string key in HttpContext