io_uring_prep_madvise(3)        liburing Manual       io_uring_prep_madvise(3)

NAME
       io_uring_prep_madvise - prepare a madvise request

SYNOPSIS
       #include <sys/mman.h>
       #include <liburing.h>

       void io_uring_prep_madvise(struct io_uring_sqe *sqe,
                                  void *addr,
                                  __u32 len,
                                  int advice);
       void io_uring_prep_madvise64(struct io_uring_sqe *sqe,
                                    void *addr,
                                    __u64 len,
                                    int advice);

DESCRIPTION
       The io_uring_prep_madvise(3) function prepares an madvise request. The
       submission queue entry sqe is setup to start an madvise operation at
       the virtual address of addr and of len length in bytes, giving it the
       advise located in advice.

       The io_uring_prep_madvise64(3) function works like
       io_uring_prep_madvise(3) except that it takes a 64-bit length rather
       than just a 32-bit one. Older kernels may not support the 64-bit length
       variant. If this variant is attempted used on a kernel that doesn't
       support 64-bit lengths, then the request will get errored with -EINVAL
       in the results field of the CQE.

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


RETURN VALUE
       None

ERRORS
       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.

SEE ALSO
       io_uring_get_sqe(3), io_uring_submit(3), io_uring_register(2),
       madvise(2)

liburing-2.2                    March 13, 2022        io_uring_prep_madvise(3)