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/*

 * 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.

 */

#define __FORCE_GLIBC

#include <features.h>

#include <errno.h>

#include <unistd.h>

#include <string.h>

#include <sys/types.h>

#include <sys/socket.h>

#include <netinet/in.h>

/*

 * Bind a socket to a privileged IP port

 */

int

bindresvport (int sd, struct sockaddr_in *sin)

{

  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 (sin == (struct sockaddr_in *) 0)

    {

      sin = &myaddr;

      bzero (sin, sizeof (*sin));

      sin->sin_family = AF_INET;

    }

  else if (sin->sin_family != AF_INET)

    {

      __set_errno (EPFNOSUPPORT);

      return -1;

    }

  if (port == 0)

    {

      port = (getpid () % NPORTS) + STARTPORT;

    }

  res = -1;

  __set_errno (EADDRINUSE);

  for (i = 0; i < NPORTS && res < 0 && errno == EADDRINUSE; ++i)

    {

      sin->sin_port = htons (port);

      if (++port > ENDPORT)

        {

          port = STARTPORT;

        }

      res = bind(sd, (struct sockaddr *)sin, sizeof(struct sockaddr_in));

    }

  return res;

}