/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8                                :vi│
╞══════════════════════════════════════════════════════════════════════════════╡
│ Copyright 2020 Justine Alexandra Roberts Tunney                              │
│                                                                              │
│ Permission to use, copy, modify, and/or distribute this software for         │
│ any purpose with or without fee is hereby granted, provided that the         │
│ above copyright notice and this permission notice appear in all copies.      │
│                                                                              │
│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL                │
│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED                │
│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE             │
│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL         │
│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR        │
│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER               │
│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR             │
│ PERFORMANCE OF THIS SOFTWARE.                                                │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/calls/internal.h"
#include "libc/calls/struct/iovec.h"
#include "libc/nt/struct/overlapped.h"
#include "libc/nt/winsock.h"
#include "libc/sock/internal.h"
#include "libc/sysv/errfuns.h"

/**
 * Performs datagram socket send on the New Technology.
 *
 * @param fd must be a socket
 * @return number of bytes handed off, or -1 w/ errno
 */
textwindows ssize_t sys_sendto_nt(int fd, const struct iovec *iov,
                                  size_t iovlen, uint32_t flags,
                                  void *opt_in_addr, uint32_t in_addrsize) {
  ssize_t rc;
  uint32_t sent = 0;
  struct SockFd *sockfd;
  struct NtIovec iovnt[16];
  struct NtOverlapped overlapped = {.hEvent = WSACreateEvent()};
  if (_check_interrupts(true, g_fds.p)) return eintr();
  if (!WSASendTo(g_fds.p[fd].handle, iovnt, __iovec2nt(iovnt, iov, iovlen),
                 &sent, flags, opt_in_addr, in_addrsize, &overlapped, NULL)) {
    rc = sent;
  } else {
    sockfd = (struct SockFd *)g_fds.p[fd].extra;
    rc = __wsablock(g_fds.p[fd].handle, &overlapped, &flags, true,
                    sockfd->sndtimeo);
  }
  WSACloseEvent(overlapped.hEvent);
  return rc;
}