Path: utzoo!utgpu!news-server.csri.toronto.edu!mailrus!uwm.edu!zaphod.mps.ohio-state.edu!ncar!jsloan@ncar.ucar.edu
From: jsloan@ncar.ucar.edu (John Sloan,8292,X1243,ML44E)
Newsgroups: comp.unix.wizards
Subject: Re: sockets
Message-ID: <7566@ncar.ucar.edu>
Date: 6 Jun 90 19:01:35 GMT
References: <4529@castle.ed.ac.uk>
Sender: news@ncar.ucar.edu
Lines: 27

From article <4529@castle.ed.ac.uk>, by elev26@castle.ed.ac.uk (Gerard A. Allan):
> In article <4421@infmx.UUCP> kevinf@infmx.UUCP (Kevin Franden) writes:
	:
>>Doesn't there exist a function to determin a preexisiting (I've 
>>heard some call this a "wellknown") service's socket number?
	:
> sounds like you want, 
>                     struct servent *getservbyname(name, proto)
>                     char *name, *proto;

This is probably what he _needs_, although I'll probably be the
Nth among M to point out that it's not what he asked for.

getservbyname() returns the _port_ number for a "well known" service
(i.e. defined in /etc/services, or if you have Yellow Pages, in the YP
services file). A service's "socket" has no meaning outside the context
of a particular process since a socket is merely a file descriptor
(integer) that is specific to a paticular process. You must create your
own socket (via socket()).  Once you have the host address (e.g. via
gethostbyname()) and port number (e.g. via getservbyname()) you can
bind or connect your socket to that address and port.

--
John Sloan              +1 303 497 1243                   ...!ncar!jsloan
NCAR/SCD, POB 3000      AMA#515306, DoD#0011         jsloan@ncar.ucar.edu
Boulder CO 80307        1990 BMW K75S Pilot     jsloan%ncar@ncario.BITNET
Logical Disclaimer:  belong(opinions,jsloan). belong(opinions,_):-!,fail.