realloc() fails


 
Thread Tools Search this Thread
Top Forums Programming realloc() fails
# 15  
Old 08-19-2011
re

The realloc() function changes the size of the memory object pointed to by ptr to the size specified by size. The contents of the object will remain unchanged up to the lesser of the new and old sizes. If the new size of the memory object would require movement of the object, the space for the previous instantiation of the object is freed. If the new size is larger, the contents of the newly allocated portion of the object are unspecified. If size is 0 and ptr is not a null pointer, the object pointed to is freed. If the space cannot be allocated, the object remains unchanged.
Login or Register to Ask a Question

Previous Thread | Next Thread

10 More Discussions You Might Find Interesting

1. Programming

problem with realloc( i think is gcc :/ )

Hi everyone, i made this program. is a simple one for practising malloc, realloc and structs. I have a struct named shop as global variable in which i take the size of the matrix from the keyboard and after i malloc it. I insert the values with the fullarray() and after i print the matrix with... (7 Replies)
Discussion started by: giampoul
7 Replies

2. UNIX for Dummies Questions & Answers

about realloc routing

#include <malloc.h> #include <stdio.h> #include <stdlib.h> #include <unistd.h> int* allocat_array(void) { int *array; int tmp; int n_values = 0 ; array = malloc(sizeof(int)); if(array == NULL) return NULL; while(scanf("%d",&tmp) != EOF) { ... (1 Reply)
Discussion started by: vincent__tse
1 Replies

3. Programming

Realloc() question

b = realloc(a, 1000); if realloc succeeds and b!=a (not in-place replacement), does realloc automatically free a or I should free both a and b afterwards? thank you! (5 Replies)
Discussion started by: bashuser2
5 Replies

4. Programming

realloc fails in C : what next ?

Hi all I'm trying to use someone else's software, which has a realloc that fails in it. This is probably due to memory limitations, as it only happens when I use this software on huge datasets. First question : how to diagnose if it's a soft or hard limitation? I mean, if it's due to my... (10 Replies)
Discussion started by: jossojjos
10 Replies

5. Programming

What happens when realloc() fails?

Hi, I am seeing varying results about, when realloc() fails in reallocation. Which one is correct out of the below? a) realloc() maintains the original pointer (i.e) the original pointer is left unaltered/untouched but relloc() returns the NULL value. b) original buffer pointer is lost... (3 Replies)
Discussion started by: royalibrahim
3 Replies

6. Programming

malloc vs realloc

Why when using realloc, john is reversed 3 times but not the other 2 names ? But if I use malloc, then the 3 names are reversed correctly ? (but then there is a memory leak) How can I reverse all 3 names without a memory leak ? char *BUFFER = NULL; char *STRREVERSE(const char *STRING) {... (5 Replies)
Discussion started by: cyler
5 Replies

7. Programming

tolower (static pointer + malloc + realloc)

N00B here. This function would be easier using a char pointer along with free. But I wish to learn how to use char static pointers (they do not require free, right ?). How do I erase the content of a static pointer ? Terminating the string works but the static pointer's content is not being... (4 Replies)
Discussion started by: limmer
4 Replies

8. Programming

help with realloc() on Linux

hi, I'm using gcc version 3.4.6 on a Red Hat system... (not sure how to determine version of glibc) when i run the following, i get: glibc detected *** realloc(): invalid next size: 0x0804a170 I'm not sure what is wrong. The error happens on the second iteration of the while loop.... (3 Replies)
Discussion started by: Andrewkl
3 Replies

9. Programming

Does realloc free fairly?

Hello, my program works properly but valgrind tells me I am not freeing allocated memory. I think the problem is in realloc. I am pretty sure I do something wrong with realloc, because I changed it a bit and valgrind noticed less errors (that the program wasn't working properly with less errors... (3 Replies)
Discussion started by: samciz
3 Replies

10. Programming

Realloc

Can Any body give me a exampla which has the usage of realloc i want a function which uses realloc & increases /decreases the size of a pointer (0 Replies)
Discussion started by: wojtyla
0 Replies
Login or Register to Ask a Question
explain_realloc_or_die(3)				     Library Functions Manual					 explain_realloc_or_die(3)

NAME
explain_realloc_or_die - Allocate and free dynamic memory and report errors SYNOPSIS
#include <libexplain/realloc.h> void explain_realloc_or_die(void *ptr, size_t size); DESCRIPTION
The explain_realloc_or_die function is used to call the realloc(3) system call. On failure an explanation will be printed to stderr, obtained from explain_realloc(3), and then the process terminates by calling exit(EXIT_FAILURE). This function is intended to be used in a fashion similar to the following example: void *new_ptr = explain_realloc_or_die(ptr, size); ptr The ptr, exactly as to be passed to the realloc(3) system call. size The size, exactly as to be passed to the realloc(3) system call. Returns: This function only returns on success. On failure, prints an explanation and exits. SEE ALSO
realloc(3) Allocate and free dynamic memory explain_realloc(3) explain realloc(3) errors exit(2) terminate the calling process COPYRIGHT
libexplain version 0.52 Copyright (C) 2009 Peter Miller explain_realloc_or_die(3)