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# TODO - I/O Riot NG Development Tasks
## High Priority (Core functionality)
### 1. Add unit test for FcntlEvent handling
- Test F_SETFL flag modification
- Test F_DUPFD file descriptor duplication
- Test F_DUPFD_CLOEXEC with O_CLOEXEC flag
- Location: internal/eventloop.go:305
### 2. Implement byte count tracking for read/write syscalls
- Track number of bytes read/written in each I/O operation
- Add to flamegraph statistics
- Location: internal/flamegraph/counter.go:11
## Medium Priority (Additional syscalls)
### 3. Implement copy_file_range syscall
- Capture source and destination file descriptors
- Track byte count copied
- Location: internal/eventloop.go:353
### 4. Implement mmap/msync syscalls
- Track memory-mapped file operations
- Capture file descriptor and memory addresses
- Location: internal/eventloop.go:356
### 5. Implement sync_file_range syscall
- Capture file descriptor and range parameters
- Track selective file synchronization
- Location: internal/eventloop.go:358
## Low Priority (Less common syscalls)
### 6. Implement open_by_handle_at syscall
- Handle file access by handle
- Location: internal/eventloop.go:354
### 7. Implement name_to_handle_at syscall
- Convert pathname to handle
- Location: internal/eventloop.go:355
### 8. Implement getcwd syscall
- Track current working directory queries
- Location: internal/eventloop.go:357
### 9. Add sys_enter_open_by_handle_at to BPF
- Update BPF tracepoint generation
- Location: internal/c/generate_tracepoints_c.raku:5
### 10. Enhance io_uring_enter capture with FD tracking
- Currently captured but without file descriptor context
- Location: internal/eventloop.go:359
## General Improvements
### 11. Write comprehensive unit tests
- Increase overall test coverage
- Location: internal/ior.go:21
### 12. Write integration tests
- Use C/Cgo to simulate real I/O operations
- Test end-to-end functionality
- Location: internal/ior.go:22
## Completed Tasks ✓
All previously listed test cases have been implemented:
- Helper functions for all event types
- Test cases for all basic syscalls
- File descriptor lifecycle tests
- Edge case handling tests
- Filtering and comm tracking tests
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