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This article mainly explains "what is the software format of linux". The content of the explanation is simple and clear, and it is easy to learn and understand. Please follow the editor's train of thought to study and learn "what is the software format of linux".

In linux, the format of the software is "ELF"; ELF is an executable connection file format, which is mainly used to describe the file structure and is the default object file format for Linux, SVR4 and "Solaris2.0"; ELF's definition of sections and gnu toolchain support for it makes it very flexible and supports dynamic link sharing libraries.

This article operating environment: linux7.3 system, Dell G3 computer.

What is the format of linux's software?

Under Linux, the program software does not have an extension.

But there is a format, called ELF. (mainly describes the structure of the file, ordinary people do not need to pay attention to it)

ELF (Executable and Linkable Format) executable connection file format is a relatively complex file format, but it is widely used. Compared with other executable files under linux, its definition of sections and the support of gnu toolchain make it very flexible, it saves enough system-related information to enable it to support cross-compilation and cross-linking on different platforms, and is highly portable. at the same time, it supports dynamic link sharing libraries in execution.

Introduction to ELF Fil

ELF (Executable and Linkable Format) executable connection file format is the default object file format of Linux,SVR4 and Solaris2.0. At present, the standard interface committee TIS has standardized ELF to a portable object file format, which runs on 32-bit Intel microcomputers and is compatible with a variety of operating systems. Analyzing elf files is helpful to understand some important system concepts, such as program compilation and linking, program loading and running, and so on.

(1) ELF file type:

ELF files of different types:

A) Relocatable files: users work with other target files to create executable files or share target files, such as lib*.a files.

B) executable file: used to generate process image and load memory execution, such as compiled executable file a.out.

C) shared object files: used to generate elf object files with other shared object files or relocatable files or to create process images with execution files, such as lib*.so files.

(2) the function of ELF file:

ELF files participate in the connection of programs (establishing a program) and the execution of programs (running a program), so files in elf format can be viewed from different perspectives:

A) if used for compilation and linking (relocatable files), the compiler and linker will treat the elf file as a collection of sections described in the section header table, which is optional.

B) if used for loading execution (executable), the loader will treat the elf file as a collection of segments described in the program header table, a segment may contain multiple sections, and the section header table is optional.

C) if it is a shared file, both contain.

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