You have to set an arbitrary limit, I chose 4096.
Best practice if you malloc:
1. check the return code from the malloc call, and handle any errors.
2. free any memory you do not need anymore.
And. You code did not work, it had undefined behavior. A successful compile in C means no warnings, no errors, no dereference of undefined or possibly NULL pointers.
This User Gave Thanks to jim mcnamara For This Post:
hello sir
since by mentioning a integer pointer and storing the integers
by incrementing the pointer value
then what is the purpose of malloc?
u can decalre it as
in t *p;
several integers can be stored by incrementing the value of p,
hence what is the diffrence between this... (2 Replies)
Hi!
I hope this is the correct forum to post the question even if I'm a newbie...
I am a C-newbie (and really on the edge to be a C-addict ;) ) and have a question.
When should I use malloc?
To state it differently, when should I NOT use malloc?
For instance, if I have an array of... (5 Replies)
Some one please explain me what is Dynamic memory allocation and the use of malloc() function.How do we allocate memory dynamically and also the other way? (3 Replies)
Hey Guys
I am trying to implement the malloc function for my OS class and I am having a little trouble with it. I would be really grateful if I could get some hints on this problem.
So I am using a doubly-linked list as my data structure and I have to allocate memory for it (duh...). The... (1 Reply)
Hey Guys
Some of my friends have got together and we are trying to write a basic kernel similar to Linux. I am trying to implement the malloc function in C and I am using a doubly linked list as the primary data structure. I need to allocate memory for this link list (duh...) and I don't feel... (2 Replies)
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)
Hi i found code in google how to malloc an 2D array and i tried that :
#include<stdio.h>
#include<stdlib.h>
int **A;
int **B;
int main(int argc,char *argv)
{
printf("name of text : %s\n",argv);
//read arrays
int i,j;
int l,m;
int M,n;
FILE *fp;
fp=fopen(argv,"r");
... (0 Replies)
Which one is faster among malloc and new?
My understanding is that since new also has to call constructors after allocating memory it must be slower than malloc.
Am I correct? (1 Reply)
Discussion started by: rupeshkp728
1 Replies
LEARN ABOUT OSX
malloc_zone_memalign
MALLOC_ZONE_MALLOC(3) BSD Library Functions Manual MALLOC_ZONE_MALLOC(3)NAME
malloc_create_zone, malloc_destroy_zone, malloc_default_zone, malloc_zone_from_ptr, malloc_zone_malloc, malloc_zone_calloc,
malloc_zone_valloc, malloc_zone_realloc, malloc_zone_memalign, malloc_zone_free -- zone-based memory allocation
SYNOPSIS
#include <malloc/malloc.h>
malloc_zone_t *
malloc_create_zone(vm_size_t start_size, unsigned flags);
void
malloc_destroy_zone(malloc_zone_t *zone);
malloc_zone_t *
malloc_default_zone(void);
malloc_zone_t *
malloc_zone_from_ptr(const void *ptr);
void *
malloc_zone_malloc(malloc_zone_t *zone, size_t size);
void *
malloc_zone_calloc(malloc_zone_t *zone, size_t num_items, size_t size);
void *
malloc_zone_valloc(malloc_zone_t *zone, size_t size);
void *
malloc_zone_realloc(malloc_zone_t *zone, void *ptr, size_t size);
void *
malloc_zone_memalign(malloc_zone_t *zone, size_t alignment, size_t size);
void
malloc_zone_free(malloc_zone_t *zone, void *ptr);
DESCRIPTION
The malloc_create_zone() function creates a malloc zone, advising an initial allocation of start_size bytes, and specifying flags that alter
the standard behavior of the zone. The returned malloc zone can be used to provide custom allocation and deallocation behavior, and to
retrieve additional information about the allocations in that zone.
The malloc_destroy_zone() function deallocates all memory associated with objects in zone as well as zone itself.
The malloc_default_zone() function returns the default system malloc zone, used by malloc(3), and free(3).
The malloc_zone_from_ptr() function returns a pointer to the malloc zone which contains ptr or NULL, if the pointer does not point to an
allocated object in any current malloc zone.
The malloc_zone_malloc(), malloc_zone_calloc(), malloc_zone_valloc(), malloc_zone_realloc(), malloc_zone_memalign(), and malloc_zone_free()
perform the same task on zone as their non-prefixed variants, malloc(3), calloc(3), valloc(3), realloc(3), posix_memalign(3), and free(3)
perform on the default system malloc zone.
RETURN VALUES
The malloc_create_zone(), malloc_default_zone(), and malloc_zone_from_ptr() functions return a pointer to a malloc_zone_t structure, or NULL
if there was an error.
The malloc_zone_malloc(), malloc_zone_calloc(), malloc_zone_valloc(), malloc_zone_realloc(), and malloc_zone_memalign() functions return a
pointer to allocated memory. If there is an error, they return a NULL pointer. They are not required to set errno.
SEE ALSO malloc(3), posix_memalign(3)BSD Aug 13, 2008 BSD