getsrvbyport.c

minux的源代码,一个非常小的操作系统

/*
 * 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[] = "@(#)getservbyport.c	5.6 (Berkeley) 6/1/90";
#endif /* LIBC_SCCS and not lint */

#include <stddef.h>
#include <string.h>

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

extern int _serv_stayopen;

struct servent *
getservbyport(port, proto)
	int port;
	const char *proto;
{
	register struct servent *p;

	setservent(_serv_stayopen);
	while (p = getservent()) {
		if (p->s_port != port)
			continue;
		if (proto == 0 || strcmp(p->s_proto, proto) == 0)
			break;
	}
	if (!_serv_stayopen)
		endservent();
	return (p);
}