Linux devices often look like files: open(), read(), write(), close(). But many devices need advanced controls that don’t fit generic system calls. That’s where ioctls (Input/Output Controls) come in. ioctl is the mechanism that lets user space send device-specific commands to kernel drivers, such as configuring modes, enabling features, querying device info, or managing buffers. This is why subsystems like DRM (graphics) and video4linux (camera/video capture) rely heavily on ioctls for detailed
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