lwIP 2.2.1 Lightweight IP stack

Macros | Functions
OS mode (TCPIP thread)
lwIP

## Macros
#define | tcpip_callback_with_block(function, ctx, block) ((block != 0)? tcpip_callback(function, ctx) : tcpip_try_callback(function, ctx))

## Functions
err_t | tcpip_input (struct pbuf *p, struct netif *inp)
err_t | tcpip_callback (tcpip_callback_fn function, void *ctx)
err_t | tcpip_try_callback (tcpip_callback_fn function, void *ctx)
struct tcpip_callback_msg * | tcpip_callbackmsg_new (tcpip_callback_fn function, void *ctx)
void | tcpip_callbackmsg_delete (struct tcpip_callback_msg *msg)
err_t | tcpip_callbackmsg_trycallback (struct tcpip_callback_msg *msg)
err_t | tcpip_callbackmsg_trycallback_fromisr (struct tcpip_callback_msg *msg)
void | tcpip_init (tcpip_init_done_fn initfunc, void *arg)

## Detailed Description

Use this mode if you run an OS on your system. It is recommended to use an RTOS that correctly handles priority inversion and to use LWIP_TCPIP_CORE_LOCKING.
Porting: implement all functions in Porting (system abstraction layer).
You can use "raw" APIs together with tcpip_callback, and all Sequential-style APIs.

## Macro Definition Documentation

## ◆ tcpip_callback_with_block

#define tcpip_callback_with_block | ( |  | function,
|  |  | ctx,
|  |  | block
| ) |  | ((block != 0)? tcpip_callback(function, ctx) : tcpip_try_callback(function, ctx))

Deprecated:
  use tcpip_try_callback() or tcpip_callback() instead

## Function Documentation

## ◆ tcpip_callback()

err_t tcpip_callback | ( | tcpip_callback_fn | function,
|  | void * | ctx
| ) |  |

Call a specific function in the thread context of tcpip_thread for easy access synchronization. A function called in that way may access lwIP core code without fearing concurrent access. Blocks until the request is posted. Must not be called from interrupt context!

Parameters

  function | the function to call
  ctx | parameter passed to f

Returns
  ERR_OK if the function was called, another err_t if not

See also
  tcpip_try_callback

## ◆ tcpip_callbackmsg_delete()

void tcpip_callbackmsg_delete | ( | struct tcpip_callback_msg * | msg | ) |

Free a callback message allocated by tcpip_callbackmsg_new().

Parameters

  msg | the message to free

See also
  tcpip_callbackmsg_new()

## ◆ tcpip_callbackmsg_new()

struct tcpip_callback_msg* tcpip_callbackmsg_new | ( | tcpip_callback_fn | function,
|  | void * | ctx
| ) |  |

Allocate a structure for a static callback message and initialize it. The message has a special type such that lwIP never frees it. This is intended to be used to send "static" messages from interrupt context, e.g. the message is allocated once and posted several times from an IRQ using tcpip_callbackmsg_trycallback(). Example usage: Trigger execution of an ethernet IRQ DPC routine in lwIP thread context.

Parameters

  function | the function to call
  ctx | parameter passed to function

Returns
  a struct pointer to pass to tcpip_callbackmsg_trycallback().

See also
  tcpip_callbackmsg_trycallback()
  tcpip_callbackmsg_delete()

## ◆ tcpip_callbackmsg_trycallback()

err_t tcpip_callbackmsg_trycallback | ( | struct tcpip_callback_msg * | msg | ) |

Try to post a callback-message to the tcpip_thread tcpip_mbox.

Parameters

  msg | pointer to the message to post

Returns
  sys_mbox_trypost() return code

See also
  tcpip_callbackmsg_new()

## ◆ tcpip_callbackmsg_trycallback_fromisr()

err_t tcpip_callbackmsg_trycallback_fromisr | ( | struct tcpip_callback_msg * | msg | ) |

Try to post a callback-message to the tcpip_thread mbox. Same as tcpip_callbackmsg_trycallback but calls sys_mbox_trypost_fromisr(), mainly to help FreeRTOS, where calls differ between task level and ISR level.

Parameters

  msg | pointer to the message to post

Returns
  sys_mbox_trypost_fromisr() return code (without change, so this knowledge can be used to e.g. propagate "bool needs_scheduling")

See also
  tcpip_callbackmsg_new()

## ◆ tcpip_init()

void tcpip_init | ( | tcpip_init_done_fn | initfunc,
|  | void * | arg
| ) |  |

Initialize this module:

- initialize all sub modules
- start the tcpip_thread

Parameters

  initfunc | a function to call when tcpip_thread is running and finished initializing
  arg | argument to pass to initfunc

## ◆ tcpip_input()

err_t tcpip_input | ( | struct pbuf * | p,
|  | struct netif * | inp
| ) |  |

Pass a received packet to tcpip_thread for input processing with ethernet_input or ip_input. Don't call directly, pass to netif_add() and call netif->input().

Parameters

  p | the received packet, p->payload pointing to the Ethernet header or to an IP header (if inp doesn't have NETIF_FLAG_ETHARP or NETIF_FLAG_ETHERNET flags)
  inp | the network interface on which the packet was received

## ◆ tcpip_try_callback()

err_t tcpip_try_callback | ( | tcpip_callback_fn | function,
|  | void * | ctx
| ) |  |

Call a specific function in the thread context of tcpip_thread for easy access synchronization. A function called in that way may access lwIP core code without fearing concurrent access. Does NOT block when the request cannot be posted because the tcpip_mbox is full, but returns ERR_MEM instead. Can be called from interrupt context.

Parameters

  function | the function to call
  ctx | parameter passed to f

Returns
  ERR_OK if the function was called, another err_t if not

See also
  tcpip_callback