io_uring_memory_size_params3
Get memory size needed for a ring with params
Usage
#include <liburing.h>
ssize_t io_uring_memory_size_params(unsigned entries, struct io_uring_params *p);
Overview
The io_uring_memory_size_params(3) function returns the total memory size needed for an io_uring ring with entries entries and the parameters specified in p.
This is useful for applications that want to pre-allocate memory for a ring or want to know the memory footprint before creating a ring.
This function provides more control than io_uring_memory_size(3) by allowing the caller to specify full ring parameters including CQ size via p->cq_entries when IORING_SETUP_CQSIZE is set in p->flags.
Return value
Returns the required memory size in bytes on success, or a negative errno value on error.
-EINVAL-
Invalid entries value (0 or too large without IORING_SETUP_CLAMP).