I'm trying to read and write to a proc file through kernel module But when I run this command : echo "hello" >> /proc/hello && cat /proc/hello It doesn't print anything and when i open the file through text editor. I found mysterious symbols like this ^@^@^@^@^@^@^@^@^@^@ Any help will be appreciated thanks in advance #include <linux/module.h> #in
我试图通过内核模块读取和写入proc文件 但是当我运行这个命令时： echo "hello" >> /proc/hello && cat /proc/hello 它不打印任何东西，当我通过文本编辑器打开文件。 我发现了这样的神秘符号 ^@^@^@^@^@^@^@^@^@^@ 任何帮助，将不胜感激提前 #include <linux/module.h> #include <linux/kernel.h> #include <linux/proc_fs.h> #include<linux/sched.h> #include &l
Is a switch statement actually faster than an if statement? I ran the code below on Visual Studio 2010's x64 C++ compiler with the /Ox flag: #include <stdlib.h> #include <stdio.h> #include <time.h> #define MAX_COUNT (1 << 29) size_t counter = 0; size_t testSwitch() { clock_t start = clock(); size_t i; for (i = 0; i < MAX_COUNT; i++) { sw
switch语句实际上比if语句快吗？ 我使用/Ox标志在Visual Studio 2010的x64 C ++编译器上运行以下代码： #include <stdlib.h> #include <stdio.h> #include <time.h> #define MAX_COUNT (1 << 29) size_t counter = 0; size_t testSwitch() { clock_t start = clock(); size_t i; for (i = 0; i < MAX_COUNT; i++) { switch (counter % 4 + 1) { cas
Sometimes when using the miniprofiler, there's just some requests that you doesn't care about. In my case I don't care much about signalr, umbraco pings, and some requests made when I wanna know if the user is idle or not. To avoid the miniprofiler using energy on (and providing results for) these types of requests, I have added the following code to my global.asax.cs file: protec
有时使用miniprofiler时，只有一些你不关心的请求。 在我的情况下，我并不在乎signalr，umbraco ping和一些要求，当我想知道用户是否闲置。 为避免miniprofiler使用这些类型的请求（并提供结果），我已将以下代码添加到我的global.asax.cs文件中： protected void Application_BeginRequest() { if ( (Request.IsLocal || Request.UserHostAddress == "37.49.143.197") && !(Request.RawUrl.Cont
I have asked How can I get the number of enums as a constant?, and I found out that I cannot get the count of enums during compile time, because C# uses reflection to do so. I read What is reflection and why is it useful?, so I have a very basic understanding of reflection. To get the count of enums, I can use Enum.GetNames(typeof(Item.Type)).Length; , and this happens during runtime using r
我曾问过如何将枚举数作为一个常量？并且我发现在编译时我无法获得枚举数，因为C＃使用反射来完成。 我读了什么是反思，为什么它有用？所以我对反思有一个非常基本的理解。 为了得到枚举数，我可以使用Enum.GetNames(typeof(Item.Type)).Length; ，并且这在运行时使用反射发生。 我没有看到任何需要获取枚举数的运行时知识，因为据我所知，枚举数在运行时不能改变。 为什么C＃必须使用反射来获取枚举数？ 为什么在编译
I have a C# application that does a few bits and pieces, but the main task it performs is done by a Delphi DLL which it calls. This Delphi DLL is a total memory hog, which needs to cache a lot of DB-information locally for speed. I'm happy that it's not leaky, as FastMM4 isn't reporting any memory leaks when the code is run within Delphi. I am starting to run into problems, howev
我有一个C＃应用程序，它可以完成一些小部件，但它执行的主要任务是通过它调用的Delphi DLL完成的。 这个Delphi DLL是一个完整的内存管理器，为了提高速度，它需要在本地缓存大量的数据库信息。 我很高兴它不会泄漏，因为FastMM4在Delphi中运行代码时没有报告任何内存泄漏。 但是，当控件返回到C＃时，我开始遇到问题。 C＃代码尝试对Delphi应用程序的结果进行一些计算（所有结果都通过DB进行编组）。 这些计算通常涉及一
I am looking for a way to show/hide WebAPI routes in the Swagger documentation using SwashBuckle in a configurable way. Adding [ApiExplorerSettings(IgnoreApi = true)] will indeed hide the routes but I'd need to recompile every time I want that to change. I have looked into creating an IOperationFilter to work with a custom Attribute that I defined. That way I can decorate the routes with
我正在寻找一种使用SwashBuckle以可配置的方式在Swagger文档中显示/隐藏WebAPI路由的方法。 添加[ApiExplorerSettings(IgnoreApi = true)]确实会隐藏路线，但每次我想要改变时都需要重新编译。 我已经研究过创建一个IOperationFilter来处理我定义的一个自定义属性。 这样我就可以用[SwaggerTag("MobileOnly")]装饰路线，并检查web.config或其他东西，看看是否应该显示路线。 属性定义如下： public class Swagger
I am making a system call that loops through every process with a certain status (passed to the syscall as a parameter) and show their Name, PID, UID and the name of their children. This is what I have so far: asmlinkage int sys_procinfo(int state){ struct task_struct *task; struct task_struct *child_ptr; struct list_head *list; for_each_process(task) { if(task->sta
我正在进行一个系统调用，它循环处理每个具有特定状态的进程（作为参数传递给系统调用）并显示其名称，PID，UID和子进程的名称。 这是我到目前为止： asmlinkage int sys_procinfo(int state){ struct task_struct *task; struct task_struct *child_ptr; struct list_head *list; for_each_process(task) { if(task->state == state){ /* print info about the parent */
There are man(2) pages for the system calls, but these describe the behavior of the C library (glibc) that sits on top of the system calls. Is the raw system call API/ABI documented somewhere (other than UseTheSourceLuke)? I saw some mention of differences between kernel/libc in the man pages, but i did not get the feeling that it is a top priority to document these differences. What i really
系统调用有2个页面，但这些页面描述了位于系统调用之上的C库（glibc）的行为。 原始系统调用API / ABI记录在某处（UseTheSourceLuke除外）？ 我在man手册中看到了一些关于kernel / libc的差异，但我并没有感到这是记录这些差异的首要任务。 我真正的意思是说：C库是否被POLICY认为是稳定的/有记录的Linux API，并且内核的系统调用API / ABI被认为是不稳定的（可能会改变），因此没有记录目的或低优先级？ 那么更改系统调用
I know in Unix-like systems c librarys such as glibc acts as an intermediary between the kernel and the userland. So for example when implementing malloc() how does glibc invoke system calls of the linux kernel does it use assembly? In Linux x86 syscalls (system calls) are made by calling interrupt 0x80 . In assembly it is done with: int $0x80 The choice of syscall is done by passing inform
我知道在类Unix系统中，像glibc这样的图书馆可以作为内核和用户之间的媒介。 所以例如在实现malloc() ，glibc如何调用Linux内核的系统调用吗？ 在Linux x86中，系统调用（系统调用）通过调用中断0x80 。 在组装中，它完成了： int $0x80 系统调用的选择是通过将信息传递给CPU寄存器来完成的。 malloc本身不是一个系统调用，但malloc算法通常使用sbrk或mmap系统调用（ brk系统调用用于sbrk ）。 有关Linux x86系统调用的
i am writing a custom system call for linux kernel everything works fine with the function call and now i am trying to create a wrapper function in order to use the function normally in any program without using the syscall (call) what i have done so far is #include <stdlib.h> #include<stdio.h> #include<linux/unistd.h> #include<errno.h> #include <sys/types.h> #inc
我正在写一个自定义的系统调用linux内核一切正常的函数调用，现在我试图创建一个包装函数，以便在任何程序中正常使用函数而不使用系统调用（调用） 我到目前为止所做的是 #include <stdlib.h> #include<stdio.h> #include<linux/unistd.h> #include<errno.h> #include <sys/types.h> #include <unistd.h> #include<string.h> #include <linux/sched.h> #include <linux/ke