This article is mainly about their own work in the problems encountered and how to solve, for what is NTP and how to use NTP these concepts are not involved, because these are the content of the Internet, I also refer to these content.
Download the
. DEB
In Ubuntu systems, software is typically published in a "Deb" package file, which is a precompiled package. In addition to the compiled software, the Deb package usually includes a copy path to the software, a dependency record for other
First, LAMP (PHP7) Installation Preparation work
First in my bricklayer VPS (I am using the 512MB memory scheme), then reload the system to select DEBIAN8 64-bit system environment. The same remember port, root password, so we need to use SSH link
Order to enter VI
VI FileName: Open or create a new file and place the cursor at the beginning of the first line
VI +n FileName: Open the file and place the cursor at the beginning of nth
VI + FileName: Open the file and place the cursor at the end
I. IGMP definition and classification
Igmp:internet Group Management Protocol, the biggest difference from broadcasting is that IGMP allows each network device to decide whether to participate in a particular multicast group.
The IP address of IGMP,
Kernel version: 2.6.34
NetFilter is introduced into the 2.4.x kernel, and becomes the main extension of network application under Linux platform, including not only the implementation of firewall, but also the processing of message (such as
Because the ARM development Board many peripherals are supporting serial communication, so in the QT to write a serial communication program is particularly important. The following step-by-step description of the development process:
Linux under
LinuxOn the server, there are a number of
Zombie Process, here's a quick way to find and eliminate these zombie processes
First, we can use the top command to see whether the server currently has a zombie process, in the following figure can see
Previously based on the IBM Deveplopworks Community Code, do a serial port initialization and send the program, today on this basis to add a reading serial data program. The first is the simplest loop-reading program, the second is through the soft
The principle of doing things enough, or endless, simple use of the grep command and sed command.
1, grep
Grammar:
grep pattern filename
Pattern (search for strings, numbers, etc., you can also use positive expressions, wildcard characters, and so
Yesterday, I looked at the introduction of Bluetooth protocol documents, today simply looked at the code in kernel (BlueZ), here to note, or inherited the old habits,
Only focus on the overall process and ignore the details, first understand the
This paper mainly analyzes the synchronization and mutual exclusion mechanism between multiple producers, multiple consumers and multiple resources.
In the operating system, we've learned about the synchronous mutex model between producer and
Linux Process scheduling
type of scheduling policy
The process of the Linux kernel connects the struct TASK_STRUCT structure of the process through a double linked list, and the task_struct structure contains all the information associated with
Linux memory out of bounds detection method--valgrind
A Valgrind
1. Download and install
Download Address: http://valgrind.org/downloads/current.html#current
#configure
#make
#make Install
2. Use
2.1 Inner Bounds
Write a section of code with
1, problem phenomenon
1.1 startx Command Not available
[Root@linuxtest2 ~]# StartX
1.3 Init 5 could not perform completion[Root@linuxtest2 ~] #init 5
2, the problem reason analysisLinux graphical user interface (X windows) mainly GNOME and KDE
Equipment Tree Detailed
After the linux3.x version, in Arch/arm/plat-xxx and Arch/arm/mach-xxx, code that describes board-level details (such as Platform_device, I2c_board_info, etc.) is cancelled in large numbers, replaced by a device tree, Its
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