text: /*
   * Copyright (c) 2018, Linaro Ltd.
   * All rights reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions are met:
   *
   * 1. Redistributions of source code must retain the above copyright notice,
   * this list of conditions and the following disclaimer.
   *
   * 2. Redistributions in binary form must reproduce the above copyright notice,
   * this list of conditions and the following disclaimer in the documentation
   * and/or other materials provided with the distribution.
   *
   * 3. Neither the name of the copyright holder nor the names of its contributors
   * may be used to endorse or promote products derived from this software without
   * specific prior written permission.
   *
   * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
   * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
   * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
   * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
   * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
   * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
   * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
   * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
   * POSSIBILITY OF SUCH DAMAGE.
   */
  
  #include <sys/socket.h>
  #include <sys/un.h>
  
  #include <fcntl.h>
  #include <stdio.h>
  
  #include "diag.h"
  #include "dm.h"
  #include "watch.h"
  
  static int unix_listen(int fd, void *data)
  {
  	struct diag_client *dm;
  	int client;
  	int ret;
  
  	client = accept(fd, NULL, NULL);
  	if (client < 0) {
  		fprintf(stderr, "failed to accept");
  		return 0;
  	}
  
  	ret = fcntl(client, F_SETFL, O_NONBLOCK);
  	if (ret < 0) {
  		fprintf(stderr, "failed to set O_NONBLOCK");
  		return 0;
  	}
  
  	dm = dm_add("UNIX", client, client, false);
  	dm_enable(dm);
  
  	return 0;
  }
  
  int diag_unix_open(void)
  {
  	struct sockaddr_un addr;
  	int ret;
  	int fd;
  
  	fd = socket(AF_UNIX, SOCK_SEQPACKET, 0);
  	if (fd < 0) {
  		fprintf(stderr, "failed to create unix socket");
  		return -1;
  	}
  
  	memset(&addr, 0, sizeof(addr));
  	addr.sun_family = AF_UNIX;
  	strncpy(addr.sun_path, "\0diag", sizeof(addr.sun_path)-1);
  	ret = bind(fd, (struct sockaddr*)&addr, sizeof(addr));
  	if (ret < 0) {
  		fprintf(stderr, "failed to bind diag socket");
  		return -1;
  	}
  
  	ret = listen(fd, 2);
  	if (ret < 0) {
  		fprintf(stderr, "failed to listen on diag socket\n");
  		return -1;
  	}
  
  	watch_add_readfd(fd, unix_listen, NULL);
  
  	return 0;
  }
  