getproto.c

操作系统源代码

/*
 * Copyright (c) 1983 Regents of the University of California.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms are permitted
 * provided that: (1) source distributions retain this entire copyright
 * notice and comment, and (2) distributions including binaries display
 * the following acknowledgement:  ``This product includes software
 * developed by the University of California, Berkeley and its contributors''
 * in the documentation or other materials provided with the distribution
 * and in all advertising materials mentioning features or use of this
 * software. 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 ``AS IS'' AND WITHOUT ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 */

#if defined(LIBC_SCCS) && !defined(lint)
static char sccsid[] = "@(#)getproto.c	5.6 (Berkeley) 6/1/90";
#endif /* LIBC_SCCS and not lint */

#include <stddef.h>

#ifdef _MINIX
#include <ansi.h>
#include <net/gen/netdb.h>
#endif

extern int _proto_stayopen;

struct protoent *
getprotobynumber(proto)
	register int proto;
{
	register struct protoent *p;

	setprotoent(_proto_stayopen);
	while (p = getprotoent())
		if (p->p_proto == proto)
			break;
	if (!_proto_stayopen)
		endprotoent();
	return (p);
}