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bt_sethostent (3)
  • >> bt_sethostent (3) ( FreeBSD man: Библиотечные вызовы )

  • BSD mandoc
     

    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
    
     
    bdaddr_same
    
     
    bdaddr_any
    
     
    bdaddr_copy
    
     - Bluetooth routines
    
     
    

    LIBRARY

    Lb libbluetooth
    
     
    

    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);
    int bdaddr_same (const bdaddr_t *a const bdaddr_t *b);
    int bdaddr_any (const bdaddr_t *a);
    int bdaddr_copy (const bdaddr_t *dst const bdaddr_t *src);
     

    DESCRIPTION

    The bt_gethostent (,);
    bt_gethostbyname ();
    and 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.

    The Fa name argument passed to bt_gethostbyname ();
    should point to a NUL -terminated hostname. The Fa addr argument passed to 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 ASCII form). The Fa 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 Fa 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 Vt protoent structure describing a Bluetooth Protocol Service Multiplexor referenced by name or number, respectively.

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

    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 Fa 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 internal static buffer will be used.

    The bdaddr_same (,);
    bdaddr_any ();
    and bdaddr_copy ();
    are handy shorthand Bluetooth address utility functions. The bdaddr_same ();
    function will test if two provided BD_ADDRs are the same. The bdaddr_any ();
    function will test if provided BD_ADDR is ANY BD_ADDR. The bdaddr_copy ();
    function will copy provided Fa src BD_ADDR into provided Fa dst BD_ADDR.  

    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);
    
     

    DIAGNOSTICS

    Error return status from bt_gethostent (,);
    bt_gethostbyname ();
    and bt_gethostbyaddr ();
    is indicated by return of a NULL pointer. The external integer h_errno may then be checked to see whether this is a temporary 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 Fa 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_aton3, inet_ntoa3  

    CAVEAT

    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.  

    AUTHORS

    An Maksim Yevmenkin Aq m_evmenkin@yahoo.com  

    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.


     

    Index

    NAME
    LIBRARY
    SYNOPSIS
    DESCRIPTION
    FILES
    EXAMPLES
    DIAGNOSTICS
    SEE ALSO
    CAVEAT
    AUTHORS
    BUGS


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