jdns_callbacks Struct Reference

Public Attributes
void *	app
	user-supplied context
int(*	time_now )(jdns_session_t *s, void *app)
int(*	rand_int )(jdns_session_t *s, void *app)
void(*	debug_line )(jdns_session_t *s, void *app, const char *str)
int(*	udp_bind )(jdns_session_t *s, void *app, const jdns_address_t *addr, int port, const jdns_address_t *maddr)
void(*	udp_unbind )(jdns_session_t *s, void *app, int handle)
int(*	udp_read )(jdns_session_t *s, void *app, int handle, jdns_address_t *addr, int *port, unsigned char *buf, int *bufsize)
int(*	udp_write )(jdns_session_t *s, void *app, int handle, const jdns_address_t *addr, int port, unsigned char *buf, int bufsize)

Member Data Documentation

debug_line

void(* jdns_callbacks::debug_line) (jdns_session_t *s, void *app, const char *str)

Parameters

s	session
app	user-supplied context
str	a line of debug text

rand_int

int(* jdns_callbacks::rand_int) (jdns_session_t *s, void *app)

Parameters

s	session
app	user-supplied context

Returns

random integer between 0-65535

time_now

int(* jdns_callbacks::time_now) (jdns_session_t *s, void *app)

Parameters

s	session
app	user-supplied context

Returns

milliseconds since session started

udp_bind

int(* jdns_callbacks::udp_bind) (jdns_session_t *s, void *app, const jdns_address_t *addr, int port, const jdns_address_t *maddr)

Note

For multicast, the following must be done:

• use SO_REUSEPORT to share with other mdns programs
• use IP_ADD_MEMBERSHIP to associate addr and maddr
• set IP_MULTICAST_TTL to 255

Parameters

s	session
app	user-supplied context
addr	ip address of interface to bind to. 0 for all
port	port of interface to bind to. 0 for any
maddr	multicast address. 0 if not using multicast

Returns

handle (>0) of bound socket, or 0 on error

udp_read

int(* jdns_callbacks::udp_read) (jdns_session_t *s, void *app, int handle, jdns_address_t *addr, int *port, unsigned char *buf, int *bufsize)

Parameters

s	session
app	user-supplied context
handle	handle of socket obtained with udp_bind
addr	store ip address of sender
port	store port of sender
buf	store packet content
bufsize	value contains max size, to be changed to real size

Returns

1 if packet read, 0 if none available

udp_unbind

void(* jdns_callbacks::udp_unbind) (jdns_session_t *s, void *app, int handle)

Parameters

s	session
app	user-supplied context
handle	handle of socket obtained with udp_bind

udp_write

int(* jdns_callbacks::udp_write) (jdns_session_t *s, void *app, int handle, const jdns_address_t *addr, int port, unsigned char *buf, int bufsize)

Parameters

s	session
app	user-supplied context
handle	handle of socket obtained with udp_bind
addr	ip address of recipient
port	port of recipient
buf	packet content
bufsize	size of packet

Returns

1 if packet taken for writing, 0 if this is a bad time

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The documentation for this struct was generated from the following file:

• jdns/jdns.h