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+.\" $NetBSD: bluetooth.3,v 1.10 2022/12/04 01:29:31 uwe Exp $
+.\"
+.\" Copyright (c) 2003 Maksim Yevmenkin <m_evmenkin@yahoo.com>
+.\" 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.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
+.\"
+.\" $FreeBSD: src/lib/libbluetooth/bluetooth.3,v 1.7 2005/01/21 10:26:11 ru Exp $
+.\"
+.Dd October 25, 2011
+.Dt BLUETOOTH 3
+.Os
+.Sh NAME
+.Nm bt_gethostbyname ,
+.Nm bt_gethostbyaddr ,
+.Nm bt_gethostent ,
+.Nm bt_sethostent ,
+.Nm bt_endhostent ,
+.Nm bt_getprotobyname ,
+.Nm bt_getprotobynumber ,
+.Nm bt_getprotoent ,
+.Nm bt_setprotoent ,
+.Nm bt_endprotoent ,
+.Nm bt_aton ,
+.Nm bt_ntoa
+.Nd Bluetooth host lookup routines
+.Sh LIBRARY
+.Lb libbluetooth
+.Sh SYNOPSIS
+.In bluetooth.h
+.Ft struct hostent *
+.Fn bt_gethostbyname "const char *name"
+.Ft struct hostent *
+.Fn bt_gethostbyaddr "const char *addr" "int len" "int type"
+.Ft struct hostent *
+.Fn bt_gethostent void
+.Ft void
+.Fn bt_sethostent "int stayopen"
+.Ft void
+.Fn bt_endhostent void
+.Ft struct protoent *
+.Fn bt_getprotobyname "const char *name"
+.Ft struct protoent *
+.Fn bt_getprotobynumber "int proto"
+.Ft struct protoent *
+.Fn bt_getprotoent void
+.Ft void
+.Fn bt_setprotoent "int stayopen"
+.Ft void
+.Fn bt_endprotoent void
+.Ft int
+.Fn bt_aton "const char *str" "bdaddr_t *ba"
+.Ft const char *
+.Fn bt_ntoa "const bdaddr_t *ba" "char *str"
+.Sh DESCRIPTION
+The
+.Fn bt_gethostent ,
+.Fn bt_gethostbyname ,
+and
+.Fn bt_gethostbyaddr
+functions each return a pointer to an object with the
+.Vt hostent
+structure describing a Bluetooth host
+referenced by name or by address, respectively.
+.Pp
+The
+.Fa name
+argument passed to
+.Fn bt_gethostbyname
+should point to a
+.Dv NUL Ns -terminated
+hostname.
+The
+.Fa addr
+argument passed to
+.Fn bt_gethostbyaddr
+should point to an address which is
+.Fa len
+bytes long,
+in binary form
+(i.e., not a Bluetooth BD_ADDR in human readable
+.Tn ASCII
+form).
+The
+.Fa type
+argument specifies the address family of this address and must be set to
+.Dv AF_BLUETOOTH .
+.Pp
+The structure returned contains the information obtained from a line in
+.Pa /etc/bluetooth/hosts
+file.
+.Pp
+The
+.Fn bt_sethostent
+function controls whether
+.Pa /etc/bluetooth/hosts
+file should stay open after each call to
+.Fn bt_gethostbyname
+or
+.Fn bt_gethostbyaddr .
+If the
+.Fa stayopen
+flag is non-zero, the file will not be closed.
+.Pp
+The
+.Fn bt_endhostent
+function closes the
+.Pa /etc/bluetooth/hosts
+file.
+.Pp
+The
+.Fn bt_getprotoent ,
+.Fn bt_getprotobyname ,
+and
+.Fn bt_getprotobynumber
+functions each return a pointer to an object with the
+.Vt protoent
+structure describing a Bluetooth Protocol Service Multiplexer referenced
+by name or number, respectively.
+.Pp
+The
+.Fa name
+argument passed to
+.Fn bt_getprotobyname
+should point to a
+.Dv NUL Ns -terminated
+Bluetooth Protocol Service Multiplexer name.
+The
+.Fa proto
+argument passed to
+.Fn bt_getprotobynumber
+should have numeric value of the desired Bluetooth Protocol Service
+Multiplexer.
+.Pp
+The structure returned contains the information obtained from a line in
+.Pa /etc/bluetooth/protocols
+file.
+.Pp
+The
+.Fn bt_setprotoent
+function controls whether
+.Pa /etc/bluetooth/protocols
+file should stay open after each call to
+.Fn bt_getprotobyname
+or
+.Fn bt_getprotobynumber .
+If the
+.Fa stayopen
+flag is non-zero, the file will not be closed.
+.Pp
+The
+.Fn bt_endprotoent
+function closes the
+.Pa /etc/bluetooth/protocols
+file.
+.Pp
+The
+.Fn bt_aton
+routine interprets the specified character string as a Bluetooth address,
+placing the address into the structure provided.
+It returns 1 if the string was successfully interpreted,
+or 0 if the string is invalid.
+.Pp
+The routine
+.Fn bt_ntoa
+takes a Bluetooth address and places an
+.Tn ASCII
+string representing the address into the buffer provided.
+It is up to the caller to ensure that provided buffer has enough space.
+If no buffer was provided then an internal static buffer will be used.
+.Sh FILES
+.Bl -tag -width ".Pa /etc/bluetooth/hosts" -compact
+.It Pa /etc/bluetooth/hosts
+.It Pa /etc/bluetooth/protocols
+.El
+.Sh EXAMPLES
+Print out the hostname associated with a specific BD_ADDR:
+.Bd -literal -offset indent
+const char *bdstr = "00:01:02:03:04:05";
+bdaddr_t bd;
+struct hostent *hp;
+
+if (!bt_aton(bdstr, &bd))
+	errx(1, "can't parse BD_ADDR %s", bdstr);
+
+if ((hp = bt_gethostbyaddr((const char *)&bd,
+    sizeof(bd), AF_BLUETOOTH)) == NULL)
+	errx(1, "no name associated with %s", bdstr);
+
+printf("name associated with %s is %s\en", bdstr, hp->h_name);
+.Ed
+.Sh RETURN VALUES
+Error return status from
+.Fn bt_gethostent ,
+.Fn bt_gethostbyname ,
+and
+.Fn bt_gethostbyaddr
+is indicated by return of a
+.Dv NULL
+pointer.
+The external integer
+.Va h_errno
+may then be checked to see whether this is a temporary failure
+or an invalid or unknown host.
+The routine
+.Xr herror 3
+can be used to print an error message describing the failure.
+If its argument
+.Fa string
+is
+.Pf non- Dv NULL ,
+it is printed, followed by a colon and a space.
+The error message is printed with a trailing newline.
+.Pp
+The variable
+.Va h_errno
+can have the following values:
+.Bl -tag -width ".Dv HOST_NOT_FOUND"
+.It Dv HOST_NOT_FOUND
+No such host is known.
+.It Dv NO_RECOVERY
+Some unexpected server failure was encountered.
+This is a non-recoverable error.
+.El
+.Pp
+The
+.Fn bt_getprotoent ,
+.Fn bt_getprotobyname ,
+and
+.Fn bt_getprotobynumber
+return
+.Dv NULL
+on EOF or error.
+.Sh SEE ALSO
+.Xr gethostbyaddr 3 ,
+.Xr gethostbyname 3 ,
+.Xr getprotobyname 3 ,
+.Xr getprotobynumber 3 ,
+.Xr herror 3 ,
+.Xr inet_aton 3 ,
+.Xr inet_ntoa 3
+.Sh HISTORY
+.Nm libbluetooth
+first appeared in
+.Fx
+was ported to
+.Nx 4.0
+and extended by
+.An Iain Hibbert
+for Itronix, Inc.
+.Sh AUTHORS
+.An Maksim Yevmenkin Aq Mt m_evmenkin@yahoo.com
+.An Iain Hibbert
+.Sh CAVEATS
+The
+.Fn bt_gethostent
+function reads the next line of
+.Pa /etc/bluetooth/hosts ,
+opening the file if necessary.
+.Pp
+The
+.Fn bt_sethostent
+function opens and/or rewinds the
+.Pa /etc/bluetooth/hosts
+file.
+.Pp
+The
+.Fn bt_getprotoent
+function reads the next line of
+.Pa /etc/bluetooth/protocols ,
+opening the file if necessary.
+.Pp
+The
+.Fn bt_setprotoent
+function opens and/or rewinds the
+.Pa /etc/bluetooth/protocols
+file.
+.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.