Shared Memory
Learn about mmap, shmget/shmat, memory-mapped I/O, and the cache coherence challenges that come with zero-copy inter-process communication.
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Signals
Learn about signal handling, signal masks, sigaction, and async notifications between processes in Unix/Linux systems.
Sockets & Network IPC
Learn how Unix domain, TCP, and UDP sockets handle local IPC and network communication, including socket pairs, multiplexing, options, and failure handling.
System Call Security
Syscall filtering, seccomp, capability-based security, and least privilege in Linux
The Concurrency Problem
Race conditions, shared mutable state, and why simultaneous access breaks things
Threads & Lightweight Processes
Understanding user threads vs kernel threads, thread pools, and thread models for concurrent programming in modern operating systems.
User & Group Management
UID/GID, privilege escalation, setuid binaries, and PAM authentication in Linux
Virtual File Systems (VFS)
Understanding how Linux abstracts multiple file systems through a common interface, enabling transparent access to ext4, NTFS, FAT, and network file systems.
Virtual Memory
How operating systems use disk to extend RAM through demand paging, and how LRU, Clock, and Working Set algorithms choose which pages to evict.
Virtualization Basics
Explore hypervisors, virtual machines, containers, and OS-level virtualization — understanding the technologies powering cloud computing.