Linux file programming learning

General steps for file programming:

        1. Open/Create File

        2. Read/write files

        3. Close the file

Text from Advanced Programming in Unix Environment

Static files: all files stored on disk

Dynamic file: After open opens the file, the Linux kernel generates a structure.

                        Linux kernel structure: fd

                                                       information node

                                                        buf is used to store content, which is essentially memory.

                        File read and write operations actually read the dynamic file in the memory. When operating the dynamic file, it will be written to the disk only after close closes the file. Therefore, the file must be closed after opening the file.

Introduction to file descriptors

int n_read=read(0,buf,5);
int n_write=write(1,buf,5);

                0 - corresponds to standard input

                1——corresponds to standard output

                2——Corresponding standard error

Linux file management description

 To use the API related to Linux file programming, click the link below

File operation part of Linux programming_This guy’s blog-CSDN blog https://blog.csdn.net/qq_44848795/article/details/121844381

x file management brief introduction