text: /*	$OpenBSD: getservbyport.c,v 1.8 2015/09/14 07:38:38 guenther Exp $ */
  /*
   * Copyright (c) 1983, 1993
   *	The Regents of the University of California.  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 University 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 REGENTS 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 REGENTS 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 <netdb.h>
  #include <stdio.h>
  #include <string.h>
  
  int
  getservbyport_r(int port, const char *proto, struct servent *se,
      struct servent_data *sd)
  {
  	int error;
  
  	setservent_r(sd->stayopen, sd);
  	while ((error = getservent_r(se, sd)) == 0) {
  		if (se->s_port != port)
  			continue;
  		if (proto == 0 || strcmp(se->s_proto, proto) == 0)
  			break;
  	}
  	if (!sd->stayopen && sd->fp != NULL) {
  		fclose(sd->fp);
  		sd->fp = NULL;
  	}
  	return (error);
  }
  DEF_WEAK(getservbyport_r);
  
  struct servent *
  getservbyport(int port, const char *proto)
  {
  	extern struct servent_data _servent_data;
  	static struct servent serv;
  
  	if (getservbyport_r(port, proto, &serv, &_servent_data) != 0)
  		return (NULL);
  	return (&serv);
  }
  