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<TITLE>realloc</TITLE>
<body bgcolor="#ffffcc">
<hr>
<pre>
<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 <stdlib.h>
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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