Lightweight HTTP monitoring server implemented in Zig, single-threaded event loop using epoll.

Version: 0.0.1

Requires Zig 0.13.0+.

zig build-exe moni.zig -O ReleaseSafe -target native-linux-gnu

./moni                  # Start on port 8080
./moni -p 9090          # Custom port
./moni -f /tmp/flag     # Set file path via CLI
MONI_PATH=/tmp/flag ./moni  # Set file path via env
./moni -v               # Enable verbose logging
./moni -h               # Show help

Path	Description	Response
/version	Server version	0.0.1
/hostname	Machine hostname	e.g. myserver
Any other	File existence check	1 (exists) / 0 (not exists) / 500 (not configured)

Flag	Description	Default
-p PORT	Listen port	8080
-f PATH	File path to check	—
-v	Verbose request/response logging	off
-h	Show help	—

File path can also be set via MONI_PATH environment variable. CLI -f takes priority.

• I/O Model: epoll with edge-triggered mode
• Concurrency: Single-threaded event loop
• Dependencies: None (Zig standard library only)
• Signals: SIGINT/SIGTERM for graceful shutdown, SIGPIPE ignored
• URL: Supports percent-encoded paths via URL decoding

# Terminal 1
MONI_PATH=/tmp/flag ./moni -v

# Terminal 2
curl http://localhost:8080/version    # 0.0.1
curl http://localhost:8080/hostname   # myserver
touch /tmp/flag
curl http://localhost:8080/check      # 1
rm /tmp/flag
curl http://localhost:8080/check      # 0