47 lines
1.5 KiB
C
47 lines
1.5 KiB
C
/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
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/*
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* Userspace interface for /dev/liveupdate
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* Live Update Orchestrator
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*
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* Copyright (c) 2025, Google LLC.
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* Pasha Tatashin <pasha.tatashin@soleen.com>
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*/
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#ifndef _UAPI_LIVEUPDATE_H
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#define _UAPI_LIVEUPDATE_H
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#include <linux/ioctl.h>
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#include <linux/types.h>
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/**
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* DOC: General ioctl format
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*
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* The ioctl interface follows a general format to allow for extensibility. Each
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* ioctl is passed in a structure pointer as the argument providing the size of
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* the structure in the first u32. The kernel checks that any structure space
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* beyond what it understands is 0. This allows userspace to use the backward
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* compatible portion while consistently using the newer, larger, structures.
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*
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* ioctls use a standard meaning for common errnos:
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*
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* - ENOTTY: The IOCTL number itself is not supported at all
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* - E2BIG: The IOCTL number is supported, but the provided structure has
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* non-zero in a part the kernel does not understand.
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* - EOPNOTSUPP: The IOCTL number is supported, and the structure is
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* understood, however a known field has a value the kernel does not
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* understand or support.
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* - EINVAL: Everything about the IOCTL was understood, but a field is not
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* correct.
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* - ENOENT: A provided token does not exist.
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* - ENOMEM: Out of memory.
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* - EOVERFLOW: Mathematics overflowed.
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*
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* As well as additional errnos, within specific ioctls.
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*/
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/* The ioctl type, documented in ioctl-number.rst */
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#define LIVEUPDATE_IOCTL_TYPE 0xBA
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#endif /* _UAPI_LIVEUPDATE_H */
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