.\" Copyright (c) 1983, 1991, 1993
.\" The Regents of the University of California. All rights reserved.
.\" %sccs.include.redist.man%
.\" @(#)getservent.3 8.1 (Berkeley) %G%
.Fn getservbyname "char *name" "char *proto"
.Fn getservbyport "int port" proto
.Fn setservent "int stayopen"
each return a pointer to an object with the
containing the broken-out
fields of a line in the network services data base,
.Bd -literal -offset indent
char *s_name; /* official name of service */
char **s_aliases; /* alias list */
int s_port; /* port service resides at */
char *s_proto; /* protocol to use */
The members of this structure are:
.Bl -tag -width s_aliases
The official name of the service.
A zero terminated list of alternate names for the service.
The port number at which the service resides.
Port numbers are returned in network byte order.
The name of the protocol to use when contacting the
reads the next line of the file, opening the file if necessary.
opens and rewinds the file. If the
the net data base will not be closed after each call to
sequentially search from the beginning
of the file until a matching
If a protocol name is also supplied (non-
searches must also match the protocol.
.Bl -tag -width /etc/services -compact
These functions use static data storage;
if the data is needed for future use, it should be
copied before any subsequent calls overwrite it.
Expecting port numbers to fit in a 32 bit
quantity is probably naive.