c-systems-programming

Installation
SKILL.md

C Systems Programming

Master C systems programming including file I/O, process management, inter-process communication, signals, and system calls for writing robust low-level system software.

File I/O Operations

File Descriptors

File descriptors are integers that represent open files in Unix-like systems. Standard file descriptors:

  • 0 - Standard input (STDIN_FILENO)
  • 1 - Standard output (STDOUT_FILENO)
  • 2 - Standard error (STDERR_FILENO)

Basic File Operations

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Jan 22, 2026