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6 ex__network__connect__abort_8c
gullradriel edited this page 2026-10-09 00:55:18 +02:00
Table of Contents

examples/ex_network_connect_abort.c

Functions

Name
int main(void )
int abort_now(void * ctx)
Connect-abort callback that always asks to abort, counting its polls.

Attributes

Name
int g_polls
Count of times the abort callback was polled (proves it ran).

Defines

Name
LONG_CONNECT_TIMEOUT_MS
Long connect budget so an un-aborted attempt would clearly out-last an aborted one.
BLACKHOLE_PORT
Blackhole port (any).
BLACKHOLE_HOST
Blackhole target: RFC 5737 documentation range, never has a listener.
ABORT_MAX_MS
An aborted connect must return in well under the connect budget.

Functions Documentation

function main

int main(
    void 
)

function abort_now

static int abort_now(
    void * ctx
)

Connect-abort callback that always asks to abort, counting its polls.

Attributes Documentation

variable g_polls

static int g_polls = 0;

Count of times the abort callback was polled (proves it ran).

Macros Documentation

define LONG_CONNECT_TIMEOUT_MS

#define LONG_CONNECT_TIMEOUT_MS 20000

Long connect budget so an un-aborted attempt would clearly out-last an aborted one.

define BLACKHOLE_PORT

#define BLACKHOLE_PORT "80"

Blackhole port (any).

define BLACKHOLE_HOST

#define BLACKHOLE_HOST "192.0.2.1"

Blackhole target: RFC 5737 documentation range, never has a listener.

define ABORT_MAX_MS

#define ABORT_MAX_MS 3000

An aborted connect must return in well under the connect budget.

Source code

/*
 * Nilorea Library
 * Copyright (C) 2005-2026 Castagnier Mickael
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
 * implied. See the License for the specific language governing
 * permissions and limitations under the License.
 *
 * SPDX-License-Identifier: Apache-2.0
 */


#include "nilorea/n_log.h"
#include "nilorea/n_network.h"
#include "nilorea/n_time.h"

#define BLACKHOLE_HOST "192.0.2.1"
#define BLACKHOLE_PORT "80"
#define LONG_CONNECT_TIMEOUT_MS 20000
#define ABORT_MAX_MS 3000

static int g_polls = 0;

static int abort_now(void* ctx) {
    (void)ctx;
    g_polls++;
    return 1;
}

int main(void) {
    set_log_level(LOG_INFO);

    int fails = 0;

    /* 1) With an abort callback registered, a connect to an unresponsive host
       returns quickly instead of blocking for the whole connect timeout. */
    netw_set_connect_abort_cb(abort_now, NULL);

    NETWORK* netw = NULL;
    N_TIME timer;
    start_HiTimer(&timer);
    int rc = netw_connect_to(&netw, (char*)BLACKHOLE_HOST, (char*)BLACKHOLE_PORT, NETWORK_IPV4, LONG_CONNECT_TIMEOUT_MS);
    time_t elapsed_us = get_usec(&timer);
    long elapsed_ms = (long)(elapsed_us / 1000);

    n_log(LOG_INFO, "aborted connect: rc=%d elapsed=%ldms polls=%d", rc, elapsed_ms, g_polls);
    if (rc != FALSE) {
        n_log(LOG_ERR, "FAIL: connect to %s should not succeed", BLACKHOLE_HOST);
        fails++;
    }
    if (elapsed_ms >= ABORT_MAX_MS) {
        n_log(LOG_ERR, "FAIL: aborted connect took %ldms, expected < %dms", elapsed_ms, ABORT_MAX_MS);
        fails++;
    }
    if (g_polls == 0) {
        n_log(LOG_ERR, "FAIL: abort callback was never polled");
        fails++;
    }
    if (netw)
        netw_close(&netw);

    /* 2) Removing the callback restores the default: connect blocks up to its
       (here deliberately short) timeout and then fails. Kept short so the
       example stays fast; only the return value is asserted, so an environment
       that fast-fails an unroutable address does not turn this into a flake. */
    netw_set_connect_abort_cb(NULL, NULL);
    netw = NULL;
    g_polls = 0;
    start_HiTimer(&timer);
    rc = netw_connect_to(&netw, (char*)BLACKHOLE_HOST, (char*)BLACKHOLE_PORT, NETWORK_IPV4, 800);
    elapsed_ms = (long)(get_usec(&timer) / 1000);
    n_log(LOG_INFO, "no-callback connect: rc=%d elapsed=%ldms polls=%d", rc, elapsed_ms, g_polls);
    if (rc != FALSE) {
        n_log(LOG_ERR, "FAIL: connect to %s should not succeed", BLACKHOLE_HOST);
        fails++;
    }
    if (g_polls != 0) {
        n_log(LOG_ERR, "FAIL: callback polled after being removed");
        fails++;
    }
    if (netw)
        netw_close(&netw);

    if (fails == 0)
        n_log(LOG_INFO, "ex_network_connect_abort: all checks passed");
    else
        n_log(LOG_ERR, "ex_network_connect_abort: %d check(s) FAILED", fails);
    return fails ? 1 : 0;
}

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