xnu kernel

Deep understanding of the PHP kernel (1) and deep understanding of the php kernel. In-depth understanding of the PHP kernel (1), in-depth understanding of the php kernel as a simple and powerful language, PHP can provide a lot of language features applicable to the Web. Starting from practice, I deeply understand the p

Heavy-duty focus, in fact, is to implement a cottage version of Windows Peloader, overloading is actually a module to re-load a copy of the other memory, run it.The so-called kernel overload, is the kernel file that is: Ntkrnlpa.exe to load a copy to the memory, and run it, such a benefit can avoid all hooks, such as SSDT, Inlinehook, etc., the principle is the hook continueHook the main original

The Android kernel has the same functions as the standard Linux kernel, which mainly implements the functions of memory management, process scheduling, interprocess communication and so on. However, there are differences in file system, interprocess communication, memory management and so on.1, file system . Most mobile devices are not hard drives but flash as storage media, so the Android

The kernel version after the installation of Fedora 8 is 2.6.23.1-42. fc8-i686, want to build a kernel tree, in fact, there are several reasons, I heard that many of the release version of the kernel has been specially configured, so some aspects are not suitable for writing Linux modules, etc, it is also good to have more hands-on operations. The selected

The Linux Kernel provides the copy_from_user ()/copy_to_user () function to copy the kernel state and user State data. However, these two functions cause blocking and cannot be used in hard or soft interruptions. These two special copy functions are generally used in functions similar to system calls. In the following code, the kernel module registers a set of f

Nginx 0.1 million concurrent Kernel Parameter Optimization, nginx10 thousand kernel parametersKernel Parameter Optimization:Net. ipv4.tcp _ max_tw_buckets = 6000The number of timewait instances. The default value is 180000.Net. ipv4.ip _ local_port_range = 1024 65000Port range that can be opened by the system.Net. ipv4.tcp _ tw_recycle = 1Enable timewait quick recovery.Net. ipv4.tcp _ tw_reuse = 1Enable reu

Test kernel version: Linux kernel 2.6.35 ---- Linux kernel 3.2.1 Original works, reprint please mark http://blog.csdn.net/yming0221/article/details/7572382 For more information, see column http://blog.csdn.net/column/details/linux-kernel-net.html Author: Yan Ming Knowledge Base: this firewall is developed based on a g

---restore content starts---20135125 Chen ZhiweiOriginal works reproduced please indicate the source"Linux kernel Analysis" MOOC course http://mooc.study.163.com/course/USTC-1000029000 "Experimental requirements:Mykernel Experimental Guidance (how the operating system works)Run and analyze a streamlined operating system kernel to understand how the operating system worksOpen the shell with a virtual machine

when the Linux kernel is programmed, kernel code execution can only directly access the data in memory, and the file system on the hard disk must be indirectly read and written by the kernel. General kernel operation file read and write in three ways: 1. Through the/proc/file as a bridge to complete the hard disk file

One, user space and kernel space:Users interact with the operating system through user space, and applications developed or used by programmers are located in user space. The user space does not have direct access to the kernel and thus cannot access hardware resources, but it can be accessed through the kernel-defined outermost routines-system transfer.Kernel sp

Linux Components :Core/boot/vmlinuz-versionKernel module:/lib/modules/versionKernel design:Single CoreModular designMicro-coreLoad Module Command :InsmodModprobePseudo File System:/proc/proc/sys: Many of the files in this directory are readable and writable/sysSome files can be writtenTo set kernel parameter values:1. Echo VALUE >/proc/sys/to/somefile (restart will fail)2, sysctl-w Kernel.hostname= "hostname" (restart will expire)3,/etc/sysctl.conf (p

After the BIOS triggers a 0x19 interrupt to load the first sector (512B) of the disk into memory, the computer actually starts executing the program on the disk. And this 512B program Bootsect.s in the first batch of code, at this time the processor is still in real mode memory addressing the maximum range is 1M (0X0000-0XFFFF), next we look at Bootsect.s in the first batch of code to do?Syssize = size of 0x3000//kernel programS

Linux0.11 Start ModeBIOS bootWhen the PC power is turned on, the CPU of the 80X86 structure will automatically enter the real mode and automatically execute the program from 0XFFFF0.This is usually the address in Rom-bios. The BIOS of the PC will perform some system detection and start at Physical address 0 at the beginningInitializes the interrupt vector. The first sector of the bootable device is then read into the memory absolute address 0x7c00, and jumps to thisA place. Bootsect.s/setup.sBoo

how the job of a computer works http://www.cnblogs.com/zhengwei0712/p/5207299.htmljob Two how the operating system works http://www.cnblogs.com/zhengwei0712/p/5234622.htmljob three Linux kernel boot process http://www.cnblogs.com/zhengwei0712/p/5253703.html　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　Chapter I.:Linux Development and UNIXChapter II: Kernel Source code acquisition, decom

Description of the processThe three main management functions of the operating system: process management, memory management, file systemTo manage the process, the kernel must have a clear description of each process, and the process descriptor provides the process information that the kernel needs to understand.Process Control block PCB task_struct: Process status, Process-open files, process priority info

20135311 Fu DongAnalyzing the process of creating a new process in the Linux kernel learning contentProcess Control block--PCB TASK_STRUCT data structureThe PCB task_struct contains:进程状态、进程打开的文件、进程优先级信息操作系统管理的三个功能：1.进程管理 2.内存管理 3.文件系统Status of the Linux process:Process State Analysis:The long state is the running status of the process, 1 is not executed, 0 is in execution, and greater than 0 is the pause;*stack is to build a

Liu Chang Original works reproduced please indicate the source "Linux kernel Analysis" MOOC course http://mooc.study.163.com/course/USTC-1000029000write in frontThis experiment focuses on the process of loading and starting an executable program in the Linux kernel, including the analysis of executables, the loading and linking of executable files, and the process of using GDB to track the EXECVE system to

Because the Linux kernel changes very quickly, each iteration between the data structure, the interface is likely to change, so for our write kernel module compatibility brings some problems, often in a version of the module can be compiled normally, the other module on the compilation failed, this time we need to do the kernel version compatible, Here's how to f

KernelPage Global Directory (PGD)of User process createdIn earlier versions:When you fork a process, you must establish the process's own kernel page directory entry (the kernel page directory entry to the user spacePage directory is placed on a contiguous page of the same physical address, so it cannot be shared, but the kernel page table of all processesProcess

Update kernel : yum-y update View the name of the old kernel : Rpm-qa|grep kernelDelete old kernel : yum-y Remove * * * * * * the kernel nameFor example:Kernel-3.6.7-4.fc16.x86_64Kernel-headers-3.6.7-4.fc16.x86_64Kernel-3.4.9-2.fc16.x86_64Libreport-plugin-kerneloops-2.0.10-3.fc16.x86_64Kernel-3.6.6-1.fc16.x86_64Abrt