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libdrm is a userspace library for interacting with the Direct Rendering Manager (DRM) Linux subsystem in the Linux kernel. The DRM subsystem is responsible for managing graphics hardware, including GPUs and display controllers. libdrm provides an API for applications to access and control this hardware.

“LIBDRM is the cross-driver middleware which allows user-space applications (such as Mesa and 2D drivers) to communicate with the Kernel by the means of the DRI protocol.”

libdrm provides a wide range of features, including:

• **Mode setting:** Allows applications to change the display resolution, refresh rate, and other parameters.
• **Buffer management:** Provides mechanisms for allocating and managing buffers for rendering.
• **Memory management:** Allows applications to access and control the graphics hardware's memory.
• **Synchronization:** Provides primitives for synchronizing access to graphics hardware resources.
• **Hardware-specific features:** Provides access to hardware-specific features, such as video decoding and encoding.

• **Freedesktop GitLab:** s://gitlab.freedesktop.org/mesa/drm(https://gitlab.freedesktop.org/mesa/drm)
• **Linux From Scratch!:** s://www.linuxfromscratch.org/blfs/view/systemd/x/libdrm.html(https://www.linuxfromscratch.org/blfs/view/systemd/x/libdrm.html)
• **GitHub:** s://github.com/aleksander0m/libdrm(https://github.com/aleksander0m/libdrm)
• **The Linux Kernel documentation:** s://dri.freedesktop.org/docs/drm/gpu/drm-uapi.html(https://dri.freedesktop.org/docs/drm/gpu/drm-uapi.html)
• **Debian Manpages:** s://manpages.debian.org/unstable/libdrm-dev/drm.7.en.html(https://manpages.debian.org/unstable/libdrm-dev/drm.7.en.html)

libdrm is a low-level library typically used by graphics drivers and other system-level software. Direct code examples are complex and beyond the scope of this summary. However, the provided resources offer in-depth documentation and examples for developers.