malloc.h

malloc (size_t size)

void * 

Dynamically allocates a block of uninitialized memory with the specified size.

calloc (size_t nmemb, size_t size)

void * 

Dynamically allocates multiple blocks of memory with the specified size.

realloc (void *ptr, size_t size)

void * 

Changes the size of a previously allocated memory block pointed to by ptr to the specified size.

free (void *ptr)

void 

Frees the memory space pointed to by ptr.

memalign (size_t alignment, size_t size)

void * 

Allocates a block of memory with the specified size based on the given alignment mode.

malloc_usable_size (void *ptr)

size_t 

Obtains the size of the memory block pointed to by ptr.