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/* wmem_user_cb.c
* Wireshark Memory Manager User Callbacks
* Copyright 2012, Evan Huus <eapache@gmail.com>
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.org>
* Copyright 1998 Gerald Combs
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#include "wmem_core.h"
#include "wmem_allocator.h"
#include "wmem_user_cb.h"
#include "wmem_user_cb_int.h"
typedef struct _wmem_user_cb_container_t {
wmem_user_cb_t cb;
void *user_data;
struct _wmem_user_cb_container_t *next;
unsigned id;
} wmem_user_cb_container_t;
void
wmem_call_callbacks(wmem_allocator_t *allocator, wmem_cb_event_t event)
{
wmem_user_cb_container_t **prev, *cur;
bool again;
prev = &(allocator->callbacks);
cur = allocator->callbacks;
while (cur) {
/* call it */
again = cur->cb(allocator, event, cur->user_data);
/* if the callback requested deregistration, or this is being triggered
* by the final destruction of the allocator, remove the callback */
if (! again || event == WMEM_CB_DESTROY_EVENT) {
*prev = cur->next;
wmem_free(NULL, cur);
cur = *prev;
}
else {
prev = &(cur->next);
cur = cur->next;
}
}
}
unsigned
wmem_register_callback(wmem_allocator_t *allocator,
wmem_user_cb_t callback, void *user_data)
{
wmem_user_cb_container_t *container;
static unsigned next_id = 1;
container = wmem_new(NULL, wmem_user_cb_container_t);
container->cb = callback;
container->user_data = user_data;
container->next = allocator->callbacks;
container->id = next_id++;
allocator->callbacks = container;
return container->id;
}
void
wmem_unregister_callback(wmem_allocator_t *allocator, unsigned id)
{
wmem_user_cb_container_t **prev, *cur;
prev = &(allocator->callbacks);
cur = allocator->callbacks;
while (cur) {
if (cur->id == id) {
*prev = cur->next;
wmem_free(NULL, cur);
return;
}
prev = &(cur->next);
cur = cur->next;
}
}
/*
* Editor modelines - https://www.wireshark.org/tools/modelines.html
*
* Local variables:
* c-basic-offset: 4
* tab-width: 8
* indent-tabs-mode: nil
* End:
*
* vi: set shiftwidth=4 tabstop=8 expandtab:
* :indentSize=4:tabSize=8:noTabs=true:
*/
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