(gdb) f 2
#2  0x0000000100010584 in sendfile_cb (req=0x1000ab920) at test-fs.c:433
433       ASSERT(req->result == 65546);
(gdb) p *req
$1 = {
  data = 0x0,
  active_queue = {
    prev = 0x10010aee8,
    next = 0x10010aee8
  },
  type = UV_UDP_SEND,
  fs_type = UV_FS_SENDFILE,
  loop = 0x10010aec0,
  cb = 0x100010480 <sendfile_cb>,
  result = -1,
  ptr = 0x0,
  path = 0x0,
  errorno = UV_ENOTSOCK,
  new_path = 0x0,
  file = 9,
  flags = 8,
  mode = 0,
  buf = 0x0,
  len = 131072,
  off = 0,
  uid = 0,
  gid = 0,
  atime = 0,
  mtime = 0,
  work_req = {
    work = 0x10004bef0 <uv__fs_work>,
    done = 0x10004c3d0 <uv__fs_done>,
    loop = 0x10010aec0,
    wq = {
      prev = 0x7fff5fbfe918,
      next = 0x7fff5fbfe918
    }
  },
  statbuf = {
    st_dev = 0,
    st_mode = 0,
    st_nlink = 0,
    st_ino = 0,
    st_uid = 0,
    st_gid = 0,
    st_rdev = 0,
    st_atimespec = {
      tv_sec = 0,
      tv_nsec = 0
    },
    st_mtimespec = {
      tv_sec = 0,
      tv_nsec = 0
    },
    st_ctimespec = {
      tv_sec = 0,
      tv_nsec = 0
    },
    st_birthtimespec = {
      tv_sec = 0,
      tv_nsec = 0
    },
    st_size = 0,
    st_blocks = 0,
    st_blksize = 0,
    st_flags = 0,
    st_gen = 0,
    st_lspare = 0,
    st_qspare = {0, 0}
  }
}
(gdb)