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