Hardware Low Level Interfaces
32-bit Register Bit-Range Helpers
Endianness Detection and Byte Ordering
Log Parsing Real Time Monitoring
Event-Driven tail -f With inotify
inotify Directory Monitor
Real-Time 5xx Rate Alerting
Isolation Resource Limits
Advisory File Locking With fcntl()
Cap Open File Descriptors With setrlimit
Inter Process Communication
AF_UNIX Framed Echo Sockets
FIFO Producer/Consumer Uppercase
Pass File Descriptors With SCM_RIGHTS
Shared-Memory Producer/Consumer Ring
Uppercase via pipe() and fork()
File System Io
Basic ls With opendir and lstat
File Copy With Raw Syscalls
In-Place Byte Replace via mmap()
mmap()-Based Byte Pattern Search
Recursive Directory Size Scan
Redirect stdout With dup2()
Shell Scripting File Automation
Batch-Rename .jpeg by Timestamp
Log Rotation With RLE Compression
Service Management Daemons
Graceful Shutdown Service
Prometheus /metrics Daemon From /proc
SIGHUP Config Reload Daemon
System Monitoring Proc
Disk Usage CRITICAL Alerter
Interface Bandwidth From /proc/net/dev
Parse /proc Stats for CPU and Memory Usage
Parse procfs Meminfo and Cpuinfo
Process Tree From ps Output
System Stats to JSON Aggregator
Security Firewall
Drop Setuid Privileges Before File Write
Parse Failed SSH And Emit Block Rules
Networking Sockets
Enumerate Interfaces With getifaddrs() and ioctl
Multiplex Reads With select()
Single-Thread Non-Blocking TCP Proxy
Single-Threaded epoll Echo Reactor
TCP File Transfer Over Sockets
UDP Payload Hex Dump Logger
Systems Programming Automation
Last Friday of Month Scheduler
List Process Open FDs Like lsof
Long-Running Process Reaper
Thread-Safe Circular Buffer
Thread-Safe Counter With pthreads Mutex
Processes Signals
Fork, Exec, and Capture Exit Status
Mini-Shell With fork() and execvp()
Monotonic Elapsed Time Measurement
Signal-Safe Periodic Ticker
Tiny Shell Core With Pipes