Linux

There is a problem in applying for large memory in the drive's read, write, and IOCTL. I don't see other people's drivers. All define a struct during probe and apply for a large enough memory, The pointer is related to the device. In this way, you

1. Install JDK Download JDK directly from Sun: The http://java.sun.com/j2se/1.4.2/download.html provides two downloads: 1. rpm in self-extracting file (j2sdk-1_4_2_04-linux-i586.bin, 32.77 MB) This is a self-extracting file, installed on Linux as

At last, I can take care of my blog. It's really annoying for Taiwanese companies ...... The previous articles briefly introduced character devices and ended with a simple character device driver. In fact, most drivers on Linux are character device

Topic that has not been completedUser address detection simple module debugging and miscellaneous detection of user space address Validity As mentioned in the previous section, when reading and writing, you need to check whether the parameter

The third time I read ldd3 (although it is now kernel3.0, but I still can learn a lot from this book dealer), I have some gains each time. Now I can finally get some code. The role of the driver: Simply put, the driver is a special code that enables

Concurrent competing states (semaphores and spin locks) Code transfer to concurrent competition control An example of competition caused by concurrent processes The character drivers mentioned above are not considering the concurrency status.

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The input device (such as buttons, keyboards, touch screens, mouse, and buzzer) is a typical character device. Its general working mechanism is that the underlying layer is the buttons, when a touch or other action occurs, an interrupt occurs (or

Compile the linux0.00 kernel (full Linux Kernel Analysis-based on the 0.12 kernel) I have bought a fully-analyzed Linux kernel written by Zhao Ke-based on the 0.12 kernel. It seems that the principles of the first four chapters have never had the

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From: http://www.ruanyifeng.com/blog/2009/10/5_ways_to_search_for_files_using_the_terminal.html Recently, I am studying Linux. Below are some notes. When using a computer, you often need to find files. In Linux, there are many ways to do this. The

Macro mark The vast majority of initialization functions and variables in the Linux Kernel use a variety of macro tags, such; Static int _ init pci_porc_init (void ){ ... } Static char version [] _ devinitdata = drv_name ".." Module_init (...) Where

Skbuff (socket buffer)It is a buffer zone used by the network protocol stack to store and transmit data. The header information of each layer of the protocol stack, user data information and other auxiliary information are stored in this

Swap is used if the system's physical memory is used up. The system will run slowly but still run. If swap space is used up, the system will have an error. Generally, the error "application is out of memory" may occur. In severe cases, the service

The driver runs in the kernel space, and the application runs in the user space. The two cannot communicate directly. However, in actual application, when the device is ready, we want to notify the user that the program device is OK, The user

Create ISO and burn ISO in Linux   1. Background:It is often used to create an ISO backup and burn it to the CD storage. It is very convenient in Windows: tool Dua! Such as ultraiso and Nero. But today weDay is about how to do this in

In Linux, fork () is implemented using copy-on-write. Copy at write time is a technology that can delay or even avoid copying data. At this time, the kernel does not copy the address space of the entire process, but shares the same address space

The project is getting bigger and bigger. It is a waste of time to re-compile the entire project every time. After research, find the following methods to help increase the speed and summarize them. Tmpfs Some people say that ramdisk is used in

I remember sorting out a list of commonly used Linux commands, but I cannot find a list of common Linux commands. I can only make one more list; As a developer, we may do some things when logging on to Linux: SVN update code, publishing applications,

Http://www.dbanotes.net/arch/unix_linux_load.html Almost every engineer who has access to Unix-like operating systems knows how to view system loads. However, the working mechanism of this item may not be clear enough. I compared some related