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Links and differences between hard links and soft links We know that files have filenames and data, which are divided into two parts on Linux:metadata (metadata) is an attached property of a file, such as file size, creation time, owner, and so on.User Data is the file data block, the data block is the place to record the real content of the file; The metadata is in Linux, the inode number in the metadata (the Inode is part of the file metadata but it does not contain the filename, and the inode

Understand the runtime address and link address from the two-statement assembly, and the Assembly link address First, let's look at two lines of assembly code: 1: adr r0, _start 2: ldr r1, =_start Load the address value of a label. What is the difference between adr and ldr? Note that the ldr here is not a command ldr, but a pseudo command ldr. If you want to differentiate them, please refer to

In windows, the link library is divided into two types: static Link Library. lib and dynamic link library. dll. When a dynamic link library is used, a dynamic link library is usually provided. lib is called the import database. It mainly provides the function and symbol name

In Windows, there are two types of link libraries: Static link libraries. lib and dynamic link library. dll. Where a dynamic-link library is used, it usually provides a. lib, called the introduction library, which mainly provides functions and symbolic names exported by the DLL, allowing the

Uboot Link Script (why link script required) The linker has two main functions, one is to combine several input files (. o files) into an output file (such as an elf-formatted executable file) according to certain rules; One is to bind the symbol to the address (the loader also does this part of the work) The program from the source code to the binary executable file needs to go through: Preprocessing

in LearningHard Linkwith theSymbolic Linkbefore, you need to know a little bit aboutInodewith theData Block. In theLinuxfile system, a file corresponds to aInodewith a number ofData Block. Inodewith theData Blockare identified by a number, such as30333aInode, the first20334aData Block. InodeAttributes of the file, such as the owner of the file, the owning user group, the permissions on the file, and a pointer to theData Blockthe pointer. The real content of the file is stored inData Blockin the.

visually control the shared library version.The format is: lib + math +. So + major version + minor version number + production numbersuch as: libmath.so.1.1.1234.Lib is the contract prefix name of a library on a Linux system,Math is the name of the library itself,So is the suffix name of the shared library,1.1.1234 is the version number of the shared library,Format: Major version number + minor version number + make (build) number.Major version number-represents the version of the current shar

1: Static link libraryA static link library is a relatively early occurrence. The static library is actually the commercial company will own the function library source code through compiles not to connect to form. O's target file, and then use the AR tool to archive the. o File as an archive file for. A (an archive of. A is also called a static link library file

regardless of the 3 file name of any one of the access, the effect is exactly the same, but if you delete any of them, Just minus 1of the value, not delete the actual content, (any existing file itself is a hard connection) only the count value becomes 0 that is no hard link to the time will be real delete content. Hard Link Features:the file has the same inode and data block;Only files that already exist

Both static and dynamic libraries share code. Static link library (LIB ):Complete all assembly work before the program execution and generate an executable target file (exe file ). Static databases have two features: The executable file generated after the Link contains the code of all functions to be called, so it occupies a large disk space. If multiple (calling the same library function)

permission, the T permission is stic_bit, we use two ordinary users to verify his role:As shown, we first deleted the LV account under the Lv-one account in the test directory under the 1.txt file, then we give the test directory to add t permissions, and then use Lv-one Delete the test directory under the subdirectory test1, the hint is not allowed, said with the T permission to play a role.Four Soft linksFormat ln-s source File link fileThe most in

Program compilation link process, program compilation link Process Let's start with HelloWorld... #include Follow these steps to connect the source file hello.cppto hello.exe: Run the following command to generate an executable file from the source file: Linux: Gcc-lstdc ++ Hello. cpp-o Hello. out // The lstdc parameter must be included; otherwise, the undefined reference to '_ gxx_personality_v0' error w

The difference between a static link library and a dynamic link libraryOne, Static link librarycompilation, compilation, compiling, precompiled--linksLinux:To generate a target fileg++-C Source.cpp-o SOURCE.OPackage as a static link libraryAR-CRV Source.a SOURCE.OUsing the static l