File Descriptor

file descriptor (fd)

An integer value that distinguishes open files.

• Managed by the kernel for each process.
• Default file descriptors
  • 0: stdin (standard input)
  • 1: stdout (standard output)
  • 2: stderr (standard error)

file table

A table that manages various information about open files.

• access mode: Indicates the mode in which the file was opened.
• file offset: An offset indicating the current read or write position in the file.
• pointer: A pointer to the actual inode.

inode

A structure containing metadata about a file.

• Manages pointers to actual data blocks.
• Accessed and managed via the inode number.
  • Mapped with the file name.

Reference

• https://youtu.be/4e907CIg088?list=PLBrGAFAIyf5pIIFQv_U1dG36L5rylTvbx&t=830