feat: add tabbed interface with 5 dedicated views

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feat: implement auto-rotate tabs at configurable interval
feat: add pause mode for copy/paste operations
feat: update memory and swap usage statistics with task summary
feat: update network interface statistics with rx/tx rates and ip addresses
feat: update disk i/o statistics with iops
feat: change color-coded output to color-coded progress bars
feat: add -r option for auto-rotate tabs
feat: update options section in readme
feat: update tabs section in readme
feat: update key bindings section in readme
feat: update data sources section in readme
docs: update readme with new features and options
feat: implement tab navigation with arrow keys
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retoor 2025-12-13 05:50:33 +01:00
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CHANGELOG.md
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## Version 0.3.0 - 2025-12-13
The interface now uses tabs to organize information into five different views. You can now automatically rotate between these tabs and pause copy/paste operations.
**Changes:** 2 files, 261 lines
**Languages:** Markdown (261 lines)
## Version 0.2.0 - 2025-12-13
The rtop tool now includes updated C source code. This improves the tool's functionality and performance.

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README.md
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**Author:** retoor <retoor@molodetz.nl>
A terminal-based system monitoring tool written in C that displays comprehensive system statistics in a dynamic, auto-refreshing interface. rtop is designed as a lightweight alternative to htop with no external dependencies beyond the standard C library.
A terminal-based system monitoring tool written in C that displays comprehensive system statistics in a tabbed, auto-refreshing interface. rtop is designed as a lightweight alternative to htop with no external dependencies beyond the standard C library.
## Features
- Tabbed interface with 5 dedicated views (CPU, Memory, Network, Disk, Process)
- Real-time system monitoring with configurable refresh interval
- Auto-rotate tabs at configurable interval
- Pause mode for copy/paste operations
- Per-core CPU utilization with temperature and frequency display
- Memory and swap usage statistics
- Memory and swap usage statistics with task summary
- Process listing sorted by CPU or memory usage
- Network interface statistics with RX/TX rates
- Disk I/O statistics
- Network interface statistics with RX/TX rates and IP addresses
- Disk I/O statistics with IOPS
- Filesystem usage information
- Color-coded output for utilization levels
- Color-coded progress bars for utilization levels
- Terminal resize handling
- Keyboard controls (q to quit)
## Requirements
@ -46,6 +48,7 @@ make install # Install to /usr/local/bin (requires root)
Options:
-d, --delay SECS Update interval in seconds (default: 1.0)
-r, --rotate SECS Auto-rotate tabs every SECS seconds (0=off, default: 0)
-s, --sort MODE Sort by: cpu (default), mem
-h, --help Show help message
-v, --version Show version
@ -56,24 +59,30 @@ Options:
```bash
./rtop # Run with default settings
./rtop -d 2 # Update every 2 seconds
./rtop -r 5 # Auto-rotate tabs every 5 seconds
./rtop -s mem # Sort processes by memory usage
./rtop -d 0.5 -r 3 # Fast refresh with 3-second tab rotation
```
## Display Sections
## Tabs
- **Header**: Hostname, OS version, kernel, uptime, load averages
- **CPU**: Per-core utilization, total usage, temperature, frequency
- **Memory**: RAM and swap usage with buffer/cache information
- **Processes**: Summary counts (running, sleeping, stopped, zombie)
- **Network**: Interface statistics with IP addresses and transfer rates
- **Disk I/O**: Read/write rates and IOPS per device
- **Filesystems**: Mount points with usage percentages
- **Process List**: Detailed per-process information
| Tab | Content |
|-----|---------|
| CPU | Per-core utilization bars, temperature, frequency, total usage |
| Memory | RAM/Swap usage, buffers/cache, task summary (running, sleeping, stopped, zombie) |
| Network | Interface list with IP addresses, RX/TX rates, total bytes transferred |
| Disk | Per-device I/O rates, IOPS, filesystem mount points with usage |
| Process | Detailed process list with PID, user, CPU%, MEM%, command |
## Controls
- `q` or `Q`: Quit the application
- `Ctrl+C`: Terminate
| Key | Action |
|-----|--------|
| Left/Right arrows | Switch between tabs |
| 1-5 | Jump directly to tab |
| ESC | Pause refresh (for copy/paste) |
| q / Q | Quit the application |
| Ctrl+C | Terminate |
## Technical Details
@ -81,19 +90,21 @@ Options:
All system information is read from the Linux `/proc` and `/sys` filesystems:
- `/proc/stat` - CPU statistics
- `/proc/meminfo` - Memory information
- `/proc/[pid]/stat` - Process information
- `/proc/net/dev` - Network statistics
- `/proc/diskstats` - Disk I/O statistics
- `/sys/class/thermal/` - Temperature sensors
| Source | Information |
|--------|-------------|
| `/proc/stat` | CPU statistics |
| `/proc/meminfo` | Memory information |
| `/proc/[pid]/stat` | Process information |
| `/proc/net/dev` | Network statistics |
| `/proc/diskstats` | Disk I/O statistics |
| `/sys/class/thermal/` | Temperature sensors |
| `/sys/devices/system/cpu/` | CPU frequency |
### Performance
- Target CPU usage: <5%
- Startup time: <100ms
- Memory footprint: <10MB RSS
- Binary size: ~1.2MB
## Project Structure

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rtop.md
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# Htop Clone System Monitor - C Implementation Specification - rtop
## Project Overview
Create a terminal-based system monitoring tool in C that replicates htop's visual interface and functionality. The tool displays comprehensive system statistics in a dynamic, auto-refreshing interface with no external dependencies or interactive actions. The application name will be `rtop`.
## Core Requirements
### Language & Constraints
- Implementation language: C (C99 or later)
- No external library dependencies beyond standard C library
- Single binary compilation with no runtime dependencies
- Statically linked where possible
- Cross-platform Linux support (primary focus: Linux kernel interfaces)
### Data Sources
All system information must be read directly from:
- `/proc` filesystem (process information, CPU stats, memory)
- `/sys` filesystem (system-wide metrics)
- Standard C library system calls (sysconf, getrlimit, etc.)
- `/etc` system files (hostname, OS information)
## Display Requirements
### Terminal Interface
- Auto-refreshing display (configurable interval, default 1-2 seconds)
- Full-screen terminal rendering using raw terminal control
- Handle terminal resize events gracefully
- Color support for visual differentiation
- UTF-8 character support for borders and separators
### Information Categories
#### System Overview Section
- Hostname and kernel version
- Uptime (days, hours, minutes)
- Current date and time
- Load averages (1, 5, 15 minute)
- System architecture
#### CPU Information
- Total CPU count and logical cores
- Per-core utilization percentages
- Aggregate CPU usage
- CPU frequency (current, min, max if available)
- CPU temperature (if available from thermal zones)
- Context switches per second
- Interrupts per second
#### Memory & Swap
- Total physical memory
- Used and available memory
- Memory utilization percentage
- Cached and buffered memory
- Swap total, used, free
- Swap utilization percentage
- Page faults and page in/out statistics
#### Process Statistics
- Total process count
- Running processes
- Sleeping processes
- Zombie/defunct processes
- Stopped processes
#### I/O Statistics
- Disk read/write operations per second
- Disk bytes read/written per second
- I/O wait time percentage
- Network statistics (if available): bytes in/out, packets
#### Process Table
- Scrollable list of running processes (or top N processes)
- Per-process information:
- Process ID (PID)
- Parent PID (PPID)
- User (UID or username)
- CPU usage percentage
- Memory usage percentage and absolute (RSS)
- Virtual memory size (VSZ)
- Process state (running, sleeping, zombie, etc.)
- Command name and arguments (or executable path)
- Thread count
- Priority/Nice value
#### Network Information
- Interface names and states
- IP addresses (IPv4)
- RX/TX bytes and packets
- Network errors and dropped packets
#### Filesystem Statistics
- Mount points and filesystems
- Total, used, available space per mount
- Utilization percentage
- Filesystem type
## Interface Layout
### Header Section
Display system overview with high-level metrics in a compact, scannable format.
### Metrics Panels
Organize information into logical sections:
- CPU and thermal metrics
- Memory and swap usage
- Process counts and states
- Network and I/O throughput
- Filesystem usage
### Process List
Table format showing top processes by CPU or memory usage, with sortable columns and clear visual hierarchy.
### Footer
Display refresh rate, current timestamp, and interaction hints (if applicable).
## Rendering Approach
### Terminal Control
- Use standard ANSI escape codes for cursor positioning, colors, and formatting
- Implement double-buffering to prevent flicker
- Clear and redraw entire screen on each refresh cycle
- Handle terminal capabilities detection
### Performance Considerations
- Minimize system calls per refresh cycle
- Cache system information that doesn't change frequently
- Read `/proc` efficiently (sequential parsing)
- Update only changed values in display
- Target <5% CPU usage for the monitor itself
### Color Scheme
- Define a readable color palette using standard terminal colors (16-color or 256-color)
- Use colors to highlight:
- High utilization (red threshold)
- Medium utilization (yellow threshold)
- Normal ranges (green)
- Neutral information (white/default)
## Configuration & Behavior
### Default Behavior
- Refresh interval: 1-2 seconds (user-adjustable via command-line argument or config)
- Start with full system view
- Sort processes by CPU usage by default (or memory alternative)
- Display processes in descending utilization order
### Graceful Shutdown
- Clean terminal state on exit (restore cursor visibility, reset colors)
- Handle SIGINT (Ctrl+C) for clean termination
- Restore terminal to pre-execution state
### Edge Cases
- Handle systems with unusual core counts (single-core, high-core systems)
- Support systems with limited `/proc` filesystem features
- Gracefully degrade missing data sources
- Handle rapid terminal resizing without crashing
## Data Update Strategy
### Sampling Approach
- Read all system metrics at regular intervals (matching refresh rate)
- Calculate deltas for rate-based metrics (I/O operations, network traffic)
- Maintain rolling history for trend calculation if needed
### Metric Calculation
- CPU usage: derived from `/proc/stat` (user, system, idle times)
- Memory: from `/proc/meminfo`
- Process metrics: from `/proc/[pid]/stat`, `/proc/[pid]/status`
- I/O: from `/proc/diskstats` and `/proc/net/dev`
## Compilation & Deployment
### Build Requirements
- Standard C compiler (gcc, clang)
- Produces single static binary (or minimal dynamic linking)
- No configuration files required at runtime
- No installation script needed
### Binary Size & Performance
- Target executable size: <2MB
- Startup time: <100ms
- Refresh cycle: <100ms per iteration
- Memory footprint: <10MB RSS during operation
## Documentation
The tool should be self-documenting through:
- Clear, logical screen layout
- Labeled sections and columns
- Metric units displayed inline
- Help text on startup or in footer
## Success Criteria
- Displays 20+ distinct system metrics simultaneously
- Updates smoothly at regular intervals
- Survives 1+ hour continuous operation without memory leaks
- Responsive to terminal size changes
- No dependencies beyond libc
- Compiles cleanly with `-Wall -Wextra -std=c99`
- Provides useful system overview at a glance comparable to htop