Application I/O Handling

Internal API for Application Input / Output checking. More...

Collaboration diagram for Application I/O Handling:

Functions
unsigned int	coap_io_prepare_io (coap_context_t *ctx, coap_socket_t *sockets[], unsigned int max_sockets, unsigned int *num_sockets, coap_tick_t now)
	Iterates through all the coap_socket_t structures embedded in endpoints or sessions associated with the ctx to determine which are wanting any read, write, accept or connect I/O (COAP_SOCKET_WANT_xxx is set). More...
void	coap_io_do_io (coap_context_t *ctx, coap_tick_t now)
	Processes any outstanding read, write, accept or connect I/O as indicated in the coap_socket_t structures (COAP_SOCKET_CAN_xxx set) embedded in endpoints or sessions associated with ctx. More...
unsigned int	coap_io_prepare_epoll (coap_context_t *ctx, coap_tick_t now)
	Any now timed out delayed packet is transmitted, along with any packets associated with requested observable response. More...
void	coap_io_do_epoll (coap_context_t *ctx, struct epoll_event *events, size_t nevents)
	Process all the epoll events. More...

Detailed Description

Internal API for Application Input / Output checking.

Function Documentation

coap_io_do_epoll()

void coap_io_do_epoll	(	coap_context_t *	ctx,
		struct epoll_event *	events,
		size_t	nevents
	)

Process all the epoll events.

Note: If epoll support is compiled into libcoap, coap_io_do_epoll() must be used instead of coap_io_do_io().

Internal function

Parameters

ctx	The current CoAP context.
events	The list of events returned from an epoll_wait() call.
nevents	The number of events.

Definition at line 1935 of file net.c.

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coap_io_do_io()

void coap_io_do_io	(	coap_context_t *	ctx,
		coap_tick_t	now
	)

Processes any outstanding read, write, accept or connect I/O as indicated in the coap_socket_t structures (COAP_SOCKET_CAN_xxx set) embedded in endpoints or sessions associated with ctx.

Note: If epoll support is compiled into libcoap, coap_io_do_epoll() must be used instead of coap_io_do_io().

Internal function.

Parameters

ctx	The CoAP context
now	Current time

Definition at line 1879 of file net.c.

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coap_io_prepare_epoll()

unsigned int coap_io_prepare_epoll	(	coap_context_t *	ctx,
		coap_tick_t	now
	)

Any now timed out delayed packet is transmitted, along with any packets associated with requested observable response.

In addition, it returns when the next expected I/O is expected to take place (e.g. a packet retransmit).

Note: If epoll support is compiled into libcoap, coap_io_prepare_epoll() must be used instead of coap_io_prepare_io().

Internal function.

Parameters

ctx	The CoAP context
now	Current time.

Returns

timeout Maxmimum number of milliseconds that can be used by a epoll_wait() to wait for network events or 0 if wait should be forever.

Definition at line 1073 of file coap_io.c.

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coap_io_prepare_io()

unsigned int coap_io_prepare_io	(	coap_context_t *	ctx,
		coap_socket_t *	sockets[],
		unsigned int	max_sockets,
		unsigned int *	num_sockets,
		coap_tick_t	now
	)

Iterates through all the coap_socket_t structures embedded in endpoints or sessions associated with the ctx to determine which are wanting any read, write, accept or connect I/O (COAP_SOCKET_WANT_xxx is set).

If set, the coap_socket_t is added to the sockets.

Any now timed out delayed packet is transmitted, along with any packets associated with requested observable response.

In addition, it returns when the next expected I/O is expected to take place (e.g. a packet retransmit).

Prior to calling coap_io_do_io(), the sockets must be tested to see if any of the COAP_SOCKET_WANT_xxx have the appropriate information and if so, COAP_SOCKET_CAN_xxx is set. This typically will be done after using a select() call.

Note: If epoll support is compiled into libcoap, coap_io_prepare_epoll() must be used instead of coap_io_prepare_io().

Internal function.

Parameters

ctx	The CoAP context
sockets	Array of socket descriptors, filled on output
max_sockets	Size of socket array.
num_sockets	Pointer to the number of valid entries in the socket arrays on output.
now	Current time.

Returns

timeout Maxmimum number of milliseconds that can be used by a select() to wait for network events or 0 if wait should be forever.

Definition at line 1125 of file coap_io.c.

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