text: /*
   * Copyright (c) 2013-2016 Dmitry V. Levin <ldv@altlinux.org>
   * 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. The name of the author may not be used to endorse or promote products
   *    derived from this software without specific prior written permission.
   *
   * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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 "tests.h"
  #include <assert.h>
  #include <stddef.h>
  #include <string.h>
  #include <signal.h>
  #include <unistd.h>
  #include <sys/wait.h>
  #include <sys/socket.h>
  #include <sys/un.h>
  
  static void
  handler(int sig)
  {
  	assert(close(1) == 0);
  	_exit(0);
  }
  
  int
  main(int ac, const char **av)
  {
  	struct sockaddr_un addr = {
  		.sun_family = AF_UNIX,
  	};
  	socklen_t len;
  
  	assert(ac == 2);
  	assert(strlen(av[1]) > 0);
  
  	strncpy(addr.sun_path, av[1], sizeof(addr.sun_path));
  	len = offsetof(struct sockaddr_un, sun_path) + strlen(av[1]) + 1;
  	if (len > sizeof(addr))
  		len = sizeof(addr);
  
  	unlink(av[1]);
  	close(0);
  	close(1);
  
  	if (socket(AF_LOCAL, SOCK_STREAM, 0))
  		perror_msg_and_skip("socket");
  	if (bind(0, (struct sockaddr *) &addr, len))
  		perror_msg_and_skip("bind");
  	if (listen(0, 5))
  		perror_msg_and_skip("listen");
  
  	memset(&addr, 0, sizeof addr);
  	assert(getsockname(0, (struct sockaddr *) &addr, &len) == 0);
  	if (len > sizeof(addr))
  		len = sizeof(addr);
  
  	pid_t pid = fork();
  	if (pid < 0)
  		perror_msg_and_fail("fork");
  
  	if (pid) {
  		assert(accept(0, (struct sockaddr *) &addr, &len) == 1);
  		assert(close(0) == 0);
  		assert(kill(pid, SIGUSR1) == 0);
  		int status;
  		assert(waitpid(pid, &status, 0) == pid);
  		assert(status == 0);
  		assert(close(1) == 0);
  	} else {
  		sigset_t set;
  		sigemptyset(&set);
  		sigaddset(&set, SIGUSR1);
  
  		assert(sigprocmask(SIG_BLOCK, &set, NULL) == 0);
  		assert(signal(SIGUSR1, handler) != SIG_ERR);
  		assert(socket(AF_LOCAL, SOCK_STREAM, 0) == 1);
  		assert(close(0) == 0);
  		assert(connect(1, (struct sockaddr *) &addr, len) == 0);
  		assert(sigprocmask(SIG_UNBLOCK, &set, NULL) == 0);
  		assert(pause() == 99);
  		return 1;
  	}
  
  	unlink(av[1]);
  	return 0;
  }
  