lwIP 2.2.1 Lightweight IP stack

Functions
mem.h File Reference
`#include "lwip/opt.h"`

## Functions
void | mem_init (void)
void * | mem_trim (void *mem, mem_size_t size)
void * | mem_malloc (mem_size_t size)
void * | mem_calloc (mem_size_t count, mem_size_t size)
void | mem_free (void *mem)

## Detailed Description

Heap API

## Function Documentation

## ◆ mem_calloc()

void* mem_calloc | ( | mem_size_t | count,
|  | mem_size_t | size
| ) |  |

Contiguously allocates enough space for count objects that are size bytes of memory each and returns a pointer to the allocated memory.

The allocated memory is filled with bytes of value zero.

Parameters

  count | number of objects to allocate
  size | size of the objects to allocate

Returns
  pointer to allocated memory / NULL pointer if there is an error

## ◆ mem_free()

void mem_free | ( | void * | rmem | ) |

Put a struct mem back on the heap

Parameters

  rmem | is the data portion of a struct mem as returned by a previous call to mem_malloc()

## ◆ mem_init()

void mem_init | ( | void |  | ) |

Zero the heap and initialize start, end and lowest-free

## ◆ mem_malloc()

void* mem_malloc | ( | mem_size_t | size_in | ) |

Allocate a block of memory with a minimum of 'size' bytes.

Parameters

  size_in | is the minimum size of the requested block in bytes.

Returns
  pointer to allocated memory or NULL if no free memory was found.

Note that the returned value will always be aligned (as defined by MEM_ALIGNMENT).

## ◆ mem_trim()

void* mem_trim | ( | void * | rmem,
|  | mem_size_t | new_size
| ) |  |

Shrink memory returned by mem_malloc().

Parameters

  rmem | pointer to memory allocated by mem_malloc the is to be shrunk
  new_size | required size after shrinking (needs to be smaller than or equal to the previous size)

Returns
  for compatibility reasons: is always == rmem, at the moment or NULL if newsize is > old size, in which case rmem is NOT touched or freed!