STRUCT SCIFIOCTL_COPY(9)

🎀 struct scifioctl_copy 🎀

okay so this page lives in the Kernel API Manual, and it’s all about struct scifioctl_copy — used for SCIF DMA copy IOCTLs. bestie, it’s giving “kernel struct with a very specific job” and honestly we respect it 💅

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✨ NAME ✨

struct scifioctl_copy — used for SCIF DMA copy IOCTLs.

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🌸 SYNOPSIS 🌸

struct scifioctl_copy {
    __s64 loffset;
    __u64 len;
    __s64 roffset;
    __u64 addr;
    __s32 flags;
 };

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👑 Members 👑

• loffset — offset in local registered address space to/from which to copy.
• len — length of range to copy.
• roffset — offset in remote registered address space to/from which to copy.
• addr — user virtual address to/from which to copy.
• flags — flags.

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💖 Description 💖

This structure is used for SCIF_READFROM, SCIF_WRITETO, SCIF_VREADFROM and SCIF_VREADFROM IOCTL's.

and yes bestie, SCIF_VREADFROM really does show up twice in the original — not me, that’s just the page 💀

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🦋 SEE ALSO 🦋

• Kernel file ./include/uapi/linux/scif_ioctl.h
• struct scif_port_id(9)
• struct scifioctl_connect(9)
• struct scifioctl_accept(9)
• struct scifioctl_msg(9)
• struct scifioctl_reg(9)
• struct scifioctl_unreg(9)
• struct scifioctl_fence_mark(9)
• struct scifioctl_fence_signal(9)
• struct scifioctl_node_ids(9)

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source: ./include/uapi/linux • October 2026 • struct scifioctl_copy(9) — bye bestie, go copy something safely 💖✨