Проект OpenNet: MAN bt_sethostent (3) Библиотечные вызовы (FreeBSD и Linux)

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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.

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.

Партнёры:

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Created 1996-2024 by Maxim Chirkov
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