Code Wrangling at its Best
In Chapter 26, we added: That gave us a real background process path. But our only user program, demo, waits for terminal input: That makes it awkward for runbg, because a background process can compete with the monitor for keyboard input. This chapter adds a second embedded user program: counter does not read from stdin.
Continue Reading “Chapter 27 — A Second User Program for Safe Background Execution”
In Chapter 25, the monitor gained an embedded program registry and a foreground run command: That gave us an exec-like path, but only in foreground mode: This chapter adds the next process-management layer: After this chapter, the monitor will support: The kernel still does not have job control, signals, or a filesystem, but it now
Continue Reading “Chapter 26 — Process Table, ps, runbg, and wait PID”
In Chapter 23, we crossed another major boundary: But the user program still started like this: That is not how we want user programs to look long-term. This chapter adds a real initial user stack with: Then crt0.S will pass those arguments to: This moves us closer to a normal process startup model. ELF process
Continue Reading “Chapter 24 — User argc / argv and a Real Initial Stack”
In Chapter 22, the kernel gained a first ELF32 loader. That was a big step, but our test ELF was still built by hand inside process.c: This chapter removes that artificial piece. We will add a tiny userland build pipeline: GNU objcopy is specifically designed to copy and transform object files between formats; we will
Continue Reading “Chapter 23 — Building a Real User C Program and Embedding Its ELF”
In Chapter 21, we completed the process lifecycle: Now we can replace the temporary TOYEXE format with the first real executable-loader milestone: ELF32. ELF is the Executable and Linkable Format used by many Unix-like systems. The ELF specification defines the file header, program header table, and how loadable segments describe a process image; the generic
Continue Reading “Chapter 22 — First ELF32 Loader Milestone”
Introduction to DNS What is DNS? DNS (Domain Name System) is like the phone book of the internet. It translates human-friendly domain names like example.com into IP addresses like 192.0.2.1 that computers use to identify each other on the network. Key DNS Concepts Types of DNS Records DNS Zones A DNS zone is a segment
Continue Reading “Understanding DNS Records for Web Servers Using ISPConfig 3”
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