Function pwritev2

src/backend/linux_raw/io/syscalls.rs:249–270

(
    fd: BorrowedFd<'_>,
    bufs: &[IoSlice<'_>],
    pos: u64,
    flags: ReadWriteFlags,
)

#[inline]
pub(crate) fn pwritev2(
    fd: BorrowedFd<'_>,
    bufs: &[IoSlice<'_>],
    pos: u64,
    flags: ReadWriteFlags,
) -> io::Result<usize> {
    let (bufs_addr, bufs_len) = slice(&bufs[..cmp::min(bufs.len(), MAX_IOV)]);

    // Unlike the plain "p" functions, the "pv" functions pass their offset in
    // an endian-independent way, and always in two registers.
    unsafe {
        ret_usize(syscall_readonly!(
            __NR_pwritev2,
            fd,
            bufs_addr,
            bufs_len,
            pass_usize(pos as usize),
            pass_usize((pos >> 32) as usize),
            flags
        ))
    }
}

#[inline]
pub(crate) unsafe fn close(fd: RawFd) {