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Top Forums Programming malloc gives the same memory to two different nodes. How to deal with it? Post 302272945 by cdbug on Friday 2nd of January 2009 12:45:28 AM
Old 01-02-2009
malloc gives the same memory to two different nodes. How to deal with it?

When allocating memory for two different nodes, the resulting memory are the same. Clearly, this will lead to a mistake. This happened in a function. And the process must be in a function.

(gdb) p tree->list[9]
$43 = (node *) 0x8be4180
(gdb) p tree->list[10]
$44 = (node *) 0x8be4180


At the beginning, it is correct. list[0] to list[8] is allocated properly. But it can not work well in list[9]

Last edited by cdbug; 01-02-2009 at 02:37 AM..
 

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MALLOC(3)						   BSD Library Functions Manual 						 MALLOC(3)

NAME
reallocf -- general purpose memory allocation functions LIBRARY
Utility functions from BSD systems (libbsd, -lbsd) SYNOPSIS
#include <bsd/stdlib.h> void * reallocf(void *ptr, size_t size); DESCRIPTION
The reallocf() function changes the size of the previously allocated memory referenced by ptr to size bytes. The contents of the memory are unchanged up to the lesser of the new and old sizes. If the new size is larger, the contents of the newly allocated portion of the memory are undefined. Upon success, the memory referenced by ptr is freed and a pointer to the newly allocated memory is returned. Note that reallocf() may move the memory allocation, resulting in a different return value than ptr. If ptr is NULL, the reallocf() function behaves identically to malloc() for the specified size. Upon failure, when the requested memory cannot be allocated, the passed pointer is freed to ease the problems with traditional coding styles for reallocf() causing memory leaks in libraries. RETURN VALUES
The reallocf() function returns a pointer, possibly identical to ptr, to the allocated memory if successful; otherwise a NULL pointer is returned, and errno is set to ENOMEM if the error was the result of an allocation failure. The buffer is deallocated in this case. SEE ALSO
brk(2), mmap(2), alloca(3), calloc(3), free(3), malloc(3), posix_memalign(3), realloc(3), HISTORY
The reallocf() function first appeared in FreeBSD 3.0. BSD
September 26, 2009 BSD
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