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+.\"     $OpenBSD: getservent.3,v 1.12 2003/06/02 20:18:35 millert Exp $
+.\"
+.\" Copyright (c) 1983, 1991, 1993
+.\"     The Regents of the University of California.  All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\" 3. 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 BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.Dd January 12, 1994
+.Dt GETSERVENT 3
+.Os
+.Sh NAME
+.Nm getservent ,
+.Nm getservbyport ,
+.Nm getservbyname ,
+.Nm setservent ,
+.Nm endservent
+.Nd get service entry
+.Sh SYNOPSIS
+.Fd #include <netdb.h>
+.Ft struct servent *
+.Fn getservent "void"
+.Ft struct servent *
+.Fn getservbyname "char *name" "char *proto"
+.Ft struct servent *
+.Fn getservbyport "int port" "char *proto"
+.Ft void
+.Fn setservent "int stayopen"
+.Ft void
+.Fn endservent "void"
+.Sh DESCRIPTION
+The
+.Fn getservent ,
+.Fn getservbyname ,
+and
+.Fn getservbyport
+functions each return a pointer to an object with the following structure
+containing the broken-out fields of a line in the network services database,
+.Pa /etc/services .
+.Bd -literal -offset indent
+struct  servent {
+        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 */
+};
+.Ed
+.Pp
+The members of this structure are:
+.Bl -tag -width s_aliases
+.It Fa s_name
+The official name of the service.
+.It Fa s_aliases
+A zero-terminated list of alternate names for the service.
+.It Fa s_port
+The port number at which the service resides.
+Port numbers are returned in network byte order.
+.It Fa s_proto
+The name of the protocol to use when contacting the service.
+.El
+.Pp
+The
+.Fn getservent
+function reads the next line of the file, opening the file if necessary.
+.Pp
+The
+.Fn setservent
+function opens and rewinds the file.
+If the
+.Fa stayopen
+flag is non-zero,
+the net database will not be closed after each call to
+.Fn getservbyname
+or
+.Fn getservbyport .
+.Pp
+The
+.Fn endservent
+function closes the file.
+.Pp
+The
+.Fn getservbyname
+and
+.Fn getservbyport
+functions sequentially search from the beginning of the file until a
+matching protocol name or port number (specified in network byte order)
+is found, or until
+.Dv EOF
+is encountered.
+If a protocol name is also supplied (non-null),
+searches must also match the protocol.
+.Sh FILES
+.Bl -tag -width /etc/services -compact
+.It Pa /etc/services
+.El
+.Sh DIAGNOSTICS
+Null pointer (0) returned on
+.Dv EOF
+or error.
+.Sh SEE ALSO
+.Xr getprotoent 3 ,
+.Xr services 5
+.Sh HISTORY
+The
+.Fn getservent ,
+.Fn getservbyport ,
+.Fn getservbyname ,
+.Fn setservent ,
+and
+.Fn endservent
+functions appeared in
+.Bx 4.2 .
+.Sh BUGS
+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.