thrieg/ft_malloc
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added support for MALLOC_PERTURB_ environment variable

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Thomas Rieg 2025-12-08 15:48:24 +01:00
parent 0fd85cf568
commit 6d84b2f72a
17 changed files with 453 additions and 404 deletions
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13
srcs/ft_free.c
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@ -6,7 +6,7 @@
/* By: thrieg < thrieg@student.42mulhouse.fr> +#+ +:+ +#+ */
/* +#+#+#+#+#+ +#+ */
/* Created: 2025/11/19 15:44:05 by thrieg #+# #+# */
/* Updated: 2025/11/25 16:21:10 by thrieg ### ########.fr */
/* Updated: 2025/12/08 15:34:11 by thrieg ### ########.fr */
/* */
/* ************************************************************************** */
@ -65,6 +65,8 @@ int defrag_zone(t_zone *zone)
void free(void *ptr)
{
pthread_mutex_lock(&g_mut);
if (!g_state.is_init)
init_env_variables(); // shouldn't ever happen because free can't be called first, but it protects the program
if (!ptr)
return ((void)pthread_mutex_unlock(&g_mut));
t_header *header = ((t_header *)ptr) - 1;
@ -84,6 +86,8 @@ void free(void *ptr)
void *ptr = header->zone;
size_t len = header->zone->size;
munmap(ptr, len);
pthread_mutex_unlock(&g_mut);
return;
}
else if (header->zone->type == E_SMALL)
{
@ -95,5 +99,12 @@ void free(void *ptr)
header->occupied = false;
defrag_zone(header->zone);
}
else
{
pthread_mutex_unlock(&g_mut);
return; // we didn't allocate this ptr
}
if (g_state.patern)
ft_memset(ptr, g_state.patern ^ 0xFF, header->size); // doesn't need to lock because we only modify the user pointer and the user doesn't have accces to it yet
pthread_mutex_unlock(&g_mut);
}