lib/libc/net/getservbyport.c

/*
 * Copyright (c) 1983 Regents of the University of California.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms are permitted
 * provided that the above copyright notice and this paragraph are
 * duplicated in all such forms and that any documentation,
 * advertising materials, and other materials related to such
 * distribution and use acknowledge that the software was developed
 * by the University of California, Berkeley.  The name of the
 * University may not 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 MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 */

#if defined(LIBC_SCCS) && !defined(lint)
static char sccsid[] = "@(#)getservbyport.c     5.5 (Berkeley) 6/27/88";
#endif /* LIBC_SCCS and not lint */

#include <netdb.h>

extern int _serv_stayopen;

struct servent *
getservbyport(port, proto)
        int port;
        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);
}