mirror of
https://git.FreeBSD.org/src.git
synced 2024-12-18 10:35:55 +00:00
156 lines
4.1 KiB
Groff
156 lines
4.1 KiB
Groff
.\" 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.
|
|
.\" 4. 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.
|
|
.\"
|
|
.\" From: @(#)getservent.3 8.3 (Berkeley) 1/12/94
|
|
.\" $FreeBSD$
|
|
.\"
|
|
.Dd July 9, 1995
|
|
.Dt GETSERVENT 3
|
|
.Os
|
|
.Sh NAME
|
|
.Nm getservent ,
|
|
.Nm getservbyport ,
|
|
.Nm getservbyname ,
|
|
.Nm setservent ,
|
|
.Nm endservent
|
|
.Nd get service entry
|
|
.Sh LIBRARY
|
|
.Lb libc
|
|
.Sh SYNOPSIS
|
|
.In netdb.h
|
|
.Ft struct servent *
|
|
.Fn getservent
|
|
.Ft struct servent *
|
|
.Fn getservbyname "const char *name" "const char *proto"
|
|
.Ft struct servent *
|
|
.Fn getservbyport "int port" "const 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 data base,
|
|
.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 data base 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 (which must be specified in
|
|
network byte order) is found,
|
|
or until
|
|
.Dv EOF
|
|
is encountered.
|
|
If a protocol name is also supplied (non-
|
|
.Dv 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 a thread-specific 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.
|