io_uring_prep_fadvise(3) liburing Manual io_uring_prep_fadvise(3)

io_uring_prep_fadvise - prepare a fadvise request

#include <fcntl.h>
#include <liburing.h>
void io_uring_prep_fadvise(struct io_uring_sqe *sqe,
                           int fd,
                           __u64 offset,
                           off_t len,
                           int advice);

The io_uring_prep_fadvise(3) function prepares an fadvise request. The submission queue entry sqe is setup to use the file descriptor pointed to by fd to start an fadvise operation at offset and of len length in bytes, giving it the advise located in advice.

This function prepares an async posix_fadvise(2) request. See that man page for details.


The CQE res field will contain the result of the operation. See the related man page for details on possible values. Note that where synchronous system calls will return -1 on failure and set errno to the actual error value, io_uring never uses errno. Instead it returns the negated errno directly in the CQE res field.

io_uring_get_sqe(3), io_uring_submit(3), io_uring_register(2), posix_fadvise(2)

March 13, 2022 liburing-2.2