vkGetSemaphoreFdKHR
To export a POSIX file descriptor representing the payload of a semaphore, call:
VkResult vkGetSemaphoreFdKHR(
VkDevice device,
const VkSemaphoreGetFdInfoKHR* pGetFdInfo,
int* pFd);
deviceis the logical device that created the semaphore being exported.pGetFdInfois a pointer to a VkSemaphoreGetFdInfoKHR structure containing parameters of the export operation.pFdwill return the file descriptor representing the semaphore payload.
Each call to vkGetSemaphoreFdKHR must create a new file descriptor
and transfer ownership of it to the application.
To avoid leaking resources, the application must release ownership of the
file descriptor when it is no longer needed.
Ownership can be released in many ways.
For example, the application can call close() on the file descriptor,
or transfer ownership back to Vulkan by using the file descriptor to import
a semaphore payload.
Where supported by the operating system, the implementation must set the
file descriptor to be closed automatically when an execve system call
is made.
Exporting a file descriptor from a semaphore may have side effects depending on the transference of the specified handle type, as described in Importing Semaphore State.
Valid Usage (Implicit)
VUID-vkGetSemaphoreFdKHR-device-parameter
device must be a valid VkDevice handle
VUID-vkGetSemaphoreFdKHR-pGetFdInfo-parameter
pGetFdInfo must be a valid pointer to a valid VkSemaphoreGetFdInfoKHR structure
VUID-vkGetSemaphoreFdKHR-pFd-parameter
pFd must be a valid pointer to an int value