Language Ccpp Cref Man Realloc.htm

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<h3>MALLOC(3) Linux Programmer's Manual MALLOC(3)
</h3>
<h3>NAME
</h3> calloc, malloc, free, realloc - Allocate and free dynamic
 memory
<h3>SYNOPSIS
</h3> #include &lt;stdlib.h&gt;
 void *calloc(size_t nmemb, size_t size);
 void *malloc(size_t size);
 void free(void *ptr);
 void *realloc(void *ptr, size_t size);
<h3>DESCRIPTION
</h3> calloc() allocates memory for an array of nmemb elements
 of size bytes each and returns a pointer to the allocated
 memory. The memory is set to zero.
 malloc() allocates size bytes and returns a pointer to the
 allocated memory. The memory is not cleared.
 free() frees the memory space pointed to by ptr, which
 must have been returned by a previous call to malloc(),
 calloc() or realloc(). If ptr is NULL, no operation is
 performed.
 realloc() changes the size of the memory block pointed to
 by ptr to size bytes. The contents will be unchanged to
 the minimum of the old an new sizes; newly allocated mem-
 ory will be uninitialized. If ptr is NULL, the call is
 equivalent to malloc(size); if size is equal to zero, the
 call is equivalent to free(ptr). Unless ptr is NULL, it
 must have been returned by an earlier call to malloc(),
 calloc() or realloc().
<h3>RETURN VALUES
</h3> For calloc() and malloc(), the value returned is a pointer
 to the allocated memory, which is suitably aligned for any
 kind of variable, or NULL if the request fails.
 free() returns no value.
 realloc() returns a pointer to the newly allocated memory,
 which is suitably aligned for any kind of variable and may
 be different from ptr, or NULL if the request fails or if
 size was equal to 0. If realloc() fails the original
 block is left untouched - it is not freed or moved.
<h3>CONFORMS TO
</h3> ANSI - C
</pre>
<hr>
<h3>SEE ALSO
</h3><p>
<a href=brk.htm>brk</a>, 
<pre>
<h3>GNU April 4, 1993 1
</h3>
</pre>
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