bt_gethostbyname(3) - NetBSD Manual Pages

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BLUETOOTH(3)            NetBSD Library Functions Manual           BLUETOOTH(3)


NAME

     bt_gethostbyname, bt_gethostbyaddr, bt_gethostent, bt_sethostent,
     bt_endhostent, bt_getprotobyname, bt_getprotobynumber, bt_getprotoent,
     bt_setprotoent, bt_endprotoent, bt_aton, bt_ntoa -- Bluetooth host lookup
     routines


LIBRARY

     Bluetooth Library (libbluetooth, -lbluetooth)


SYNOPSIS

     #include <bluetooth.h>

     struct hostent *
     bt_gethostbyname(const char *name);

     struct hostent *
     bt_gethostbyaddr(const char *addr, int len, int type);

     struct hostent *
     bt_gethostent(void);

     void
     bt_sethostent(int stayopen);

     void
     bt_endhostent(void);

     struct protoent *
     bt_getprotobyname(const char *name);

     struct protoent *
     bt_getprotobynumber(int proto);

     struct protoent *
     bt_getprotoent(void);

     void
     bt_setprotoent(int stayopen);

     void
     bt_endprotoent(void);

     int
     bt_aton(const char *str, bdaddr_t *ba);

     const char *
     bt_ntoa(const bdaddr_t *ba, char *str);


DESCRIPTION

     The bt_gethostent(), bt_gethostbyname(), and bt_gethostbyaddr() functions
     each return a pointer to an object with the hostent structure describing
     a Bluetooth host referenced by name or by address, respectively.

     The name argument passed to bt_gethostbyname() should point to a
     NUL-terminated hostname.  The addr argument passed to bt_gethostbyaddr()
     should point to an address which is len bytes long, in binary form (i.e.,
     not a Bluetooth BD_ADDR in human readable ASCII form).  The type argument
     specifies the address family of this address and must be set to
     AF_BLUETOOTH.

     The structure returned contains the information obtained from a line in
     /etc/bluetooth/hosts file.

     The bt_sethostent() function controls whether /etc/bluetooth/hosts file
     should stay open after each call to bt_gethostbyname() or
     bt_gethostbyaddr().  If the stayopen flag is non-zero, the file will not
     be closed.

     The bt_endhostent() function closes the /etc/bluetooth/hosts file.

     The bt_getprotoent(), bt_getprotobyname(), and bt_getprotobynumber()
     functions each return a pointer to an object with the protoent structure
     describing a Bluetooth Protocol Service Multiplexer referenced by name or
     number, respectively.

     The name argument passed to bt_getprotobyname() should point to a
     NUL-terminated Bluetooth Protocol Service Multiplexer name.  The proto
     argument passed to bt_getprotobynumber() should have numeric value of the
     desired Bluetooth Protocol Service Multiplexer.

     The structure returned contains the information obtained from a line in
     /etc/bluetooth/protocols file.

     The bt_setprotoent() function controls whether /etc/bluetooth/protocols
     file should stay open after each call to bt_getprotobyname() or
     bt_getprotobynumber().  If the stayopen flag is non-zero, the file will
     not be closed.

     The bt_endprotoent() function closes the /etc/bluetooth/protocols file.

     The 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.

     The routine bt_ntoa() takes a Bluetooth address and places an 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.


FILES

     /etc/bluetooth/hosts
     /etc/bluetooth/protocols


EXAMPLES

     Print out the hostname associated with a specific BD_ADDR:

           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\n", bdstr, hp->h_name);


RETURN VALUES

     Error return status from bt_gethostent(), bt_gethostbyname(), and
     bt_gethostbyaddr() is indicated by return of a NULL pointer.  The exter-
     nal integer h_errno may then be checked to see whether this is a tempo-
     rary failure or an invalid or unknown host.  The routine herror(3) can be
     used to print an error message describing the failure.  If its argument
     string is non-NULL, it is printed, followed by a colon and a space.  The
     error message is printed with a trailing newline.

     The variable h_errno can have the following values:

     HOST_NOT_FOUND  No such host is known.

     NO_RECOVERY     Some unexpected server failure was encountered.  This is
                     a non-recoverable error.

     The bt_getprotoent(), bt_getprotobyname(), and bt_getprotobynumber()
     return NULL on EOF or error.


SEE ALSO

     gethostbyaddr(3), gethostbyname(3), getprotobyname(3),
     getprotobynumber(3), herror(3), inet_aton(3), inet_ntoa(3)


HISTORY

     libbluetooth first appeared in FreeBSD was ported to NetBSD 4.0 and
     extended by Iain Hibbert for Itronix, Inc.


AUTHORS

     Maksim Yevmenkin <m_evmenkin@yahoo.com>
     Iain Hibbert


CAVEATS

     The bt_gethostent() function reads the next line of /etc/bluetooth/hosts,
     opening the file if necessary.

     The bt_sethostent() function opens and/or rewinds the
     /etc/bluetooth/hosts file.

     The bt_getprotoent() function reads the next line of
     /etc/bluetooth/protocols, opening the file if necessary.

     The bt_setprotoent() function opens and/or rewinds the
     /etc/bluetooth/protocols file.


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.

NetBSD 10.1                    October 25, 2011                    NetBSD 10.1