# vkImportFenceFdKHR(3) Manual Page

## Name

vkImportFenceFdKHR - Import a fence from a POSIX file descriptor

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## C Specification

To import a fence payload from a POSIX file descriptor, call:

    // Provided by VK_KHR_external_fence_fd
    VkResult vkImportFenceFdKHR(
        VkDevice                                    device,
        const VkImportFenceFdInfoKHR*               pImportFenceFdInfo);

## Parameters

- `device` is the logical device that created the fence.

- `pImportFenceFdInfo` is a pointer to a VkImportFenceFdInfoKHR structure specifying the fence and import parameters.

## Description

Importing a fence payload from a file descriptor transfers ownership of the file descriptor from the application to the Vulkan implementation. The application must not perform any operations on the file descriptor after a successful import.

Applications can import the same fence payload into multiple instances of Vulkan, into the same instance from which it was exported, and multiple times into a given Vulkan instance.

Valid Usage

- VUID-vkImportFenceFdKHR-fence-01463
  `fence` must not be associated with any queue command that has not yet completed execution on that queue

Valid Usage (Implicit)

- VUID-vkImportFenceFdKHR-device-parameter
  `device` must be a valid VkDevice handle

- VUID-vkImportFenceFdKHR-pImportFenceFdInfo-parameter
  `pImportFenceFdInfo` must be a valid pointer to a valid VkImportFenceFdInfoKHR structure

Return Codes

On success, this command returns

  - `VK_SUCCESS`

On failure, this command returns

  - `VK_ERROR_OUT_OF_HOST_MEMORY`

  - `VK_ERROR_INVALID_EXTERNAL_HANDLE`

## See Also

VK_KHR_external_fence_fd, VkDevice, VkImportFenceFdInfoKHR

## Document Notes

For more information, see the Vulkan Specification

This page is extracted from the Vulkan Specification. Fixes and changes should be made to the Specification, not directly.

## Copyright

Copyright 2014-2025 The Khronos Group Inc.

SPDX-License-Identifier: CC-BY-4.0