Linux

1. who printed the segmentation fault string in shell?This string is actually printed by bash (or another shell), rather than the current error process or kernel. For more information, see Bash Source code Waitpid (-1, & status, 0) statement.

TCP is a reliable connection protocol, but don't count on the implementation of its theory. It is a practice. Nothing is a theory behind any practice, but a lot of theory, TCP is a combination of single stop, GBN (back n) and Sr (select

Ip_conntrack is built into the netfilter framework of the Linux protocol stack. Its implementation is complicated, but its logic is quite simple. Ip_conntrack tracks every stream. A stream is defined by a quintuple. The basic term of the quintuple

I. Can Vim Enable Automatic completion of words when editing files?For the vim auto-completion function, Try Ctrl-n.2. Can the vim editor open multiple windows?Vim is executed on the terminal and exclusive to the entire terminal during execution,

1,> redirect output symbolUsage: Command> file nameFeature: overwrite (when the input and output files are the same fileParts are cleared; continuous redirection is not suitable)Typical applications: Merge files (Cat a B> C); clear files

For JDK installation, see: Http://blog.csdn.net/supercrsky/article/details/8283200 For Apache installation, see: Http://blog.csdn.net/supercrsky/article/details/8308055 The mod_jk.so version used in this article is 1.2.30 general version, this

There is no need to use white memory. Why should we limit the size of the stack at the beginning? The Linux mechanism is to use virtual memory as compact as much as possible. The principle is that you can use it without me now, there is no concept

Null pointers are generally used for validity detection. In fact, there is a conventional rule, that is, invalid pointers are not necessarily null, just for the sake of simplicity, as long as the pointer is invalid, the rule sets it to null. The

POSIX's shared memory is implemented through the tmpfs file system attached to the user space, while the shared memory of System V is implemented by the tmpfs of the kernel itself, the two are actually implemented using the same mechanism. The

Many Protocol control information is included in the application layer data, which directly affects the establishment of The Link. For example, the FTP protocol is like this. FTP is divided into port mode, pass mode, and port mode, at first, the

I was not going to start my computer today. I was too sleepy and wanted to go to bed. However, a buddy sent me a text message and asked me a question. So I turned on my computer, I did not expect it to be a very representative problem. By the way,

Prio_tree is used in the Linux kernel for reverse memory ing. prio-tree is a search tree that looks for a range. Why is it a mathematical problem to organize it into a tree, simply put, the root node contains all the intervals, and the parent node

Reprinted please indicate Author: alanx Email: zhangsuozhu@tom.com QQ: 8540426Http://hi.baidu.com/alanx/ When the kernel is ready for sending packets, the following function will be called. The most important structure is struct sk_buff. Please

7.3. delayed executionA device driver often needs to wait for a while to execute code for a specific segment, and often allows the hardware to complete a task. in this section, we involve many different technologies for delay. the environment in

Linux supports QoS from kernel 2.1.105. However, you need to recompile the kernel. When running 'make config', set experimental _ options to 'y' and set class based Queueing (CBQ), token bucket flow, and traffic shapers to 'y ', run 'make Dep & #59;

Copyleft of this document belongs to yfydz and can be freely copied and reproduced when published using GPL. It is strictly prohibited to be used for any commercial purposes. MSN: yfydz_no1@hotmail.com This article introduces some common data

Recently, my colleagues used the Linux signal mechanism in programming, which caused me to think about the signal mechanism in Linux. The signal mechanism is a very common inter-process communication mechanism in Linux. Many people do not consider

1. First download "qt sdk for Linux" from http://qt.nokia.com/downloads, including qt4.6 and QT creator1.3. Download qt sdk for Linux/X11 32-bit ** (353 MB) 2. Modify the properties of the file qt-sdk-linux-x86-opensource-2009.05.bin to make it

There are many software packages in Linux to implement standard mail services. The Unix/Linux email system model can be divided into three modules: the mail delivery proxy MTA, the mail storage and obtaining proxy MSA, and the mail customer proxy

1. motherboard Information. View the serial number of the motherboard--------------------------------------------------# Use commandsDmidecode | grep-I 'serial number'# View Board informationCAT/proc/PCI-----------------------------------------------