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/*
* Ouroboros - Copyright (C) 2016 - 2024
*
* The IPC Resource Manager - Registry - Flows
*
* Dimitri Staessens <dimitri@ouroboros.rocks>
* Sander Vrijders <sander@ouroboros.rocks>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., http://www.fsf.org/about/contact/.
*/
#define _POSIX_C_SOURCE 200809L
#define OUROBOROS_PREFIX "reg/flow"
#include <ouroboros/logs.h>
#include "flow.h"
#include <assert.h>
#include <errno.h>
#include <stdbool.h>
#include <stdlib.h>
struct reg_flow * reg_flow_create(const struct flow_info * info)
{
struct reg_flow * flow;
assert(info != NULL);
assert(info->id > 0);
assert(info->n_pid != 0);
assert(info->n_1_pid == 0);
assert(info->mpl == 0);
assert(info->state == FLOW_INIT);
flow = malloc(sizeof(*flow));
if (flow == NULL) {
log_err("Failed to malloc flow.");
goto fail_malloc;
}
memset(flow, 0, sizeof(*flow));
clock_gettime(PTHREAD_COND_CLOCK, &flow->t0);
list_head_init(&flow->next);
flow->info = *info;
return flow;
fail_malloc:
return NULL;
}
static void destroy_rbuffs(struct reg_flow * flow)
{
if (flow->n_rb != NULL)
shm_rbuff_destroy(flow->n_rb);
flow->n_rb = NULL;
if (flow->n_1_rb != NULL)
shm_rbuff_destroy(flow->n_1_rb);
flow->n_1_rb = NULL;
}
void reg_flow_destroy(struct reg_flow * flow)
{
assert(flow != NULL);
switch(flow->info.state) {
case FLOW_ACCEPT_PENDING:
clrbuf(flow->data);
/* FALLTHRU */
default:
destroy_rbuffs(flow);
break;
}
assert(flow->n_rb == NULL);
assert(flow->n_1_rb == NULL);
assert(flow->data.data == NULL);
assert(flow->data.len == 0);
assert(list_is_empty(&flow->next));
free(flow);
}
static int create_rbuffs(struct reg_flow * flow,
struct flow_info * info)
{
assert(flow != NULL);
assert(info != NULL);
flow->n_rb = shm_rbuff_create(info->n_pid, info->id);
if (flow->n_rb == NULL)
goto fail_n_rb;
assert(flow->info.n_1_pid == 0);
assert(flow->n_1_rb == NULL);
flow->info.n_1_pid = info->n_1_pid;
flow->n_1_rb = shm_rbuff_create(info->n_1_pid, info->id);
if (flow->n_1_rb == NULL)
goto fail_n_1_rb;
return 0;
fail_n_1_rb:
shm_rbuff_destroy(flow->n_rb);
fail_n_rb:
return -ENOMEM;
}
int reg_flow_update(struct reg_flow * flow,
struct flow_info * info)
{
assert(flow != NULL);
assert(info != NULL);
assert(flow->info.id == info->id);
switch(info->state) {
case FLOW_ACCEPT_PENDING:
assert(flow->info.state == FLOW_INIT);
flow->info.n_pid = info->n_pid;
break;
case FLOW_ALLOC_PENDING:
assert(flow->info.state == FLOW_INIT);
assert(info->n_1_pid != 0);
if (create_rbuffs(flow, info) < 0)
goto fail;
break;
case FLOW_ALLOCATED:
assert(info->n_1_pid != 0);
assert(flow->info.state > FLOW_INIT);
assert(flow->info.state < FLOW_ALLOCATED);
assert(flow->info.n_pid != 0);
assert(info->mpl != 0);
flow->info.mpl = info->mpl;
if (flow->info.state == FLOW_ALLOC_PENDING)
break;
flow->info.qs = info->qs;
if (create_rbuffs(flow, info) < 0)
goto fail;
break;
case FLOW_DEALLOCATED:
destroy_rbuffs(flow);
break;
case FLOW_DEALLOC_PENDING:
break;
default:
assert(false);
return -EPERM;
}
flow->info.state = info->state;
*info = flow->info;
return 0;
fail:
return -ENOMEM;
}
void reg_flow_set_data(struct reg_flow * flow,
const buffer_t * buf)
{
assert(flow != NULL);
assert(buf != NULL);
assert(flow->data.data == NULL);
assert(flow->data.len == 0);
flow->data = *buf;
}
void reg_flow_get_data(struct reg_flow * flow,
buffer_t * buf)
{
assert(flow != NULL);
assert(buf != NULL);
*buf = flow->data;
clrbuf(flow->data);
}
void reg_flow_free_data(struct reg_flow * flow)
{
freebuf(flow->data);
}
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