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Transferred from: Micro reading   https://www.weidianyuedu.com There are many popular programming languages on the market, such as Python , JAVA, Go, etc. you may think C language is very old and backward. If you have this idea, you may just be a beginner. Before I shared with you the definition and usage of several special standards in C la ...

linux allocate physical memory page 1, Physical memory allocation overview In the linux kernel, the page allocator can allocate one or more consecutive physical pages. The number of allocated pages can only be an integer power of 2; Allocating continuous physical pages is more beneficial to alleviate the memory fragmentation of the system ...

Sliding windows are divided into two types: unfixed window size and fixed window size: (commonly used when looking for substrings that meet certain requirements) 1) Unfixed window size: the window size will change. When the current window does not meet the requirements, it will move backward as a whole. 2) Fixed window size: the window size i ...

More exchanges, welcome tiktok, 81849645041 objective Understand internal memory and external memory, and realize the dynamic management of memory. principle Memory management refers to the technology of allocating and using computer memory resources when software is running. Its main purpose is how to allocate efficiently and quickly, and ...

1. Signal Signals are software interrupts that provide a way to handle asynchronous events The simplest interface of unix signaling mechanism is the signal function /* * sign Signal integer * func Function pointer * return : Function pointer (a function address, function has an integer parameter, no return value) */ void (* signal(int ...

More exchanges, welcome tiktok, 81849645041 objective Familiar with the working principle of SD card and SDIO. Master the reading and writing of SD card. principle Most single chip microcomputer systems need large capacity storage devices to store data. At present, U disk, FLASH chip, SD card and so on are commonly used. They have their own ...

catalogue Program translation environment and execution environment Compilation and linking Pretreatment Program translation environment and execution environment In any implementation of ANSI C, there are two different environments. Translation environment and execution environment. Translation environment: in this environment, the ...

Catalogue Introduction to dynamic memory function Common mistakes Flexible array Introduction to dynamic memory function malloc: apply for a continuous space like memory void* malloc(size_t size); If the development is successful, return a pointer to the developed space. If the development fails, a NULL is returned The return t ...

catalogue Function introduction Simulation Implementation of library function Function introduction strlen: The string ends with '\ 0'. The strlen function returns the number of characters (excluding '\ 0') that appear before '\ 0' in the string. The string pointed to by the parameter must end with '\ 0'. Note that the return value o ...

Implementation of FTP cloud disk for linux small project preface In the past two days, I have reviewed the basic knowledge of linux (file IO operation, process, thread, network programming, interprocess communication) I learned before. Well, on the whole, I have a deeper understanding of the knowledge points than I learned for the first ...