lib/ip/getproto.c

   1 /*
   2  * Copyright (c) 1983 Regents of the University of California.
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms are permitted
   6  * provided that: (1) source distributions retain this entire copyright
   7  * notice and comment, and (2) distributions including binaries display
   8  * the following acknowledgement:  ``This product includes software
   9  * developed by the University of California, Berkeley and its contributors''
  10  * in the documentation or other materials provided with the distribution
  11  * and in all advertising materials mentioning features or use of this
  12  * software. Neither the name of the University nor the names of its
  13  * contributors may be used to endorse or promote products derived
  14  * from this software without specific prior written permission.
  15  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
  16  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
  17  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
  18  */
  19
  20 #if defined(LIBC_SCCS) && !defined(lint)
  21 static char sccsid[] = "@(#)getproto.c  5.6 (Berkeley) 6/1/90";
  22 #endif /* LIBC_SCCS and not lint */
  23
  24 #include <stddef.h>
  25
  26 #ifdef _MINIX
  27 #include <ansi.h>
  28 #include <net/gen/netdb.h>
  29 #endif
  30
  31 extern int _proto_stayopen;
  32
  33 struct protoent *
  34 getprotobynumber(proto)
  35         register int proto;
  36 {
  37         register struct protoent *p;
  38
  39         setprotoent(_proto_stayopen);
  40         while (p = getprotoent())
  41                 if (p->p_proto == proto)
  42                         break;
  43         if (!_proto_stayopen)
  44                 endprotoent();
  45         return (p);
  46 }