text: #if !defined(lint) && defined(SCCSIDS)
  static  char sccsid[] = "@(#)bindresvport.c	2.2 88/07/29 4.0 RPCSRC 1.8 88/02/08 SMI";
  #endif
  /*
   * Sun RPC is a product of Sun Microsystems, Inc. and is provided for
   * unrestricted use provided that this legend is included on all tape
   * media and as a part of the software program in whole or part.  Users
   * may copy or modify Sun RPC without charge, but are not authorized
   * to license or distribute it to anyone else except as part of a product or
   * program developed by the user.
   * 
   * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
   * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
   * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
   * 
   * Sun RPC is provided with no support and without any obligation on the
   * part of Sun Microsystems, Inc. to assist in its use, correction,
   * modification or enhancement.
   * 
   * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
   * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
   * OR ANY PART THEREOF.
   * 
   * In no event will Sun Microsystems, Inc. be liable for any lost revenue
   * or profits or other special, indirect and consequential damages, even if
   * Sun has been advised of the possibility of such damages.
   * 
   * Sun Microsystems, Inc.
   * 2550 Garcia Avenue
   * Mountain View, California  94043
   */
  
  /*
   * Copyright (c) 1987 by Sun Microsystems, Inc.
   */
  
  #include <string.h>
  #include <unistd.h>
  #include <sys/types.h>
  #include <sys/errno.h>
  #include <sys/socket.h>
  #include <netinet/in.h>
  #include <gssrpc/rpc.h>
  #include <errno.h>
  
  /*
   * Bind a socket to a privileged IP port
   */
  int
  bindresvport(int sd, struct sockaddr_in *sockin)
  {
  	int res;
  	static short port;
  	struct sockaddr_in myaddr;
  	int i;
  
  #define STARTPORT 600
  #define ENDPORT (IPPORT_RESERVED - 1)
  #define NPORTS	(ENDPORT - STARTPORT + 1)
  
  	if (sockin == (struct sockaddr_in *)0) {
  		sockin = &myaddr;
  		memset(sockin, 0, sizeof (*sockin));
  		sockin->sin_family = AF_INET;
  	} else if (sockin->sin_family != AF_INET) {
  		errno = EPFNOSUPPORT;
  		return (-1);
  	}
  	if (port == 0) {
  		port = (getpid() % NPORTS) + STARTPORT;
  	}
  	res = -1;
  	errno = EADDRINUSE;
  	for (i = 0; i < NPORTS && res < 0 && errno == EADDRINUSE; i++) {
  		sockin->sin_port = htons(port++);
  		if (port > ENDPORT) {
  			port = STARTPORT;
  		}
  		res = bind(sd, (struct sockaddr *) sockin,
  			   sizeof(struct sockaddr_in));
  	}
  	return (res);
  }
  