text: /*-*- 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/sig.internal.h"
  #include "libc/calls/state.internal.h"
  #include "libc/intrin/spinlock.h"
  #include "libc/mem/mem.h"
  #include "libc/nt/winsock.h"
  #include "libc/sock/internal.h"
  #include "libc/sock/syscall_fd.internal.h"
  #include "libc/sysv/consts/fio.h"
  #include "libc/sysv/consts/o.h"
  #include "libc/sysv/consts/poll.h"
  #include "libc/sysv/consts/sock.h"
  #include "libc/sysv/errfuns.h"
  
  textwindows int sys_accept_nt(struct Fd *fd, void *addr, uint32_t *addrsize,
                                int flags) {
    int64_t h;
    int client, oflags;
    struct SockFd *sockfd, *sockfd2;
    sockfd = (struct SockFd *)fd->extra;
    if (_check_interrupts(true, g_fds.p)) return eintr();
    for (;;) {
      if (!WSAPoll(&(struct sys_pollfd_nt){fd->handle, POLLIN}, 1,
                   __SIG_POLLING_INTERVAL_MS)) {
        if (_check_interrupts(true, g_fds.p)) {
          return eintr();
        }
        continue;
      }
      if ((h = WSAAccept(fd->handle, addr, (int32_t *)addrsize, 0, 0)) != -1) {
        oflags = 0;
        if (flags & SOCK_CLOEXEC) oflags |= O_CLOEXEC;
        if (flags & SOCK_NONBLOCK) oflags |= O_NONBLOCK;
        if ((!(flags & SOCK_NONBLOCK) ||
             __sys_ioctlsocket_nt(h, FIONBIO, (uint32_t[]){1}) != -1) &&
            (sockfd2 = calloc(1, sizeof(struct SockFd)))) {
          __fds_lock();
          if ((client = __reservefd_unlocked(-1)) != -1) {
            sockfd2->family = sockfd->family;
            sockfd2->type = sockfd->type;
            sockfd2->protocol = sockfd->protocol;
            g_fds.p[client].kind = kFdSocket;
            g_fds.p[client].flags = oflags;
            g_fds.p[client].mode = 0140666;
            g_fds.p[client].handle = h;
            g_fds.p[client].extra = (uintptr_t)sockfd2;
            __fds_unlock();
            return client;
          }
          __fds_unlock();
          free(sockfd2);
        }
        __sys_closesocket_nt(h);
      }
      return __winsockerr();
    }
  }
  