NVIDIA DMA-BUF Export/Import Proof-of-Concept

This directory contains a minimal proof-of-concept (POC) demonstrating:

1. Allocation of a NVIDIA buffer object using the NVIDIA kernel driver.
2. Export of that buffer object as a file descriptor (fd).
3. Import of the fd into the NVIDIA DRM driver as a GEM object.
4. Export of the GEM object as a DMA-BUF fd.
5. Inter-process sharing: one process allocates and exports, another imports and reads.

Structure

• exporter.c: Allocates and exports the buffer, sends the DMA-BUF fd to another process.
• importer.c: Receives the DMA-BUF fd, maps and reads the buffer.
• fd-passing.h/c: Helper for passing fds over UNIX domain sockets.
• Makefile: Build instructions.

Requirements

• NVIDIA proprietary driver and access to /dev/nvidia* and /dev/dri/renderD*.
• Root or appropriate permissions.

Usage

1. Build: make
2. Run exporter in one terminal: ./exporter
3. Run importer in another terminal: ./importer