free.c

void free( void  * ptr )

Deallocates a block of memory created by malloc calloc or realloc.

void * malloc( size_t  size )

Allocates size bytes of memory

void * calloc( size_t  nmemb, size_t  size )

Allocates nmemb consecutive blocks of size bytes, and zeroes the memory

void * realloc( void  * ptr, size_t  size )

Attempts to resize the allocated block of memory given in ptr.