/*      $NetBSD: t_dlclose_thread.c,v 1.4 2026/07/16 02:50:11 riastradh Exp $   */

/*-
 * Copyright (c) 2025 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#include <sys/cdefs.h>
__RCSID("$NetBSD: t_dlclose_thread.c,v 1.4 2026/07/16 02:50:11 riastradh Exp $");

#include <atf-c.h>
#include <dlfcn.h>
#include <pthread.h>
#include <signal.h>
#include <stdatomic.h>
#include <time.h>
#include <unistd.h>

#include "h_macros.h"

pthread_barrier_t bar;
atomic_bool stop = false;

int sleep_init;
int sleep_fini;
int dlopen_cookie;
int dlclose_cookie;

#define MAXNDSOS        5

static void *
dlclose_thread(void *cookie)
{
        const char *const path = cookie;
        void *handle;

        (void)pthread_barrier_wait(&bar);
        while (!atomic_load_explicit(&stop, memory_order_relaxed)) {
                handle = dlopen(path, RTLD_LAZY | RTLD_LOCAL);
                ATF_REQUIRE(handle != NULL);
                dlclose(handle);
        }
        return NULL;
}

static void
test_dlclose_thread(const char *const *dsos, size_t ndsos)
{
        pthread_t t[2*MAXNDSOS];
        unsigned i;

        ATF_REQUIRE_MSG(ndsos <= MAXNDSOS, "ndso=%zu", ndsos);

        RZ(pthread_barrier_init(&bar, NULL, 1 + 2*ndsos));
        for (i = 0; i < 2*ndsos; i++) {
                const char *const dso = dsos[i % ndsos];
                RZ(pthread_create(&t[i], NULL, &dlclose_thread,
                        __UNCONST(dso)));
        }
        (void)pthread_barrier_wait(&bar);
        (void)sleep(5);
        atomic_store_explicit(&stop, true, memory_order_relaxed);
        for (i = 0; i < 2*ndsos; i++)
                RZ(pthread_join(t[i], NULL));
}

ATF_TC(dlclose_thread);
ATF_TC_HEAD(dlclose_thread, tc)
{
        atf_tc_set_md_var(tc, "descr",
            "Test concurrent dlopen and dlclose with destructors");
        atf_tc_set_md_var(tc, "timeout", "20");
}
ATF_TC_BODY(dlclose_thread, tc)
{
        static const char *const dsos[] = {
                "libh_helper_dso1.so",
                "libh_helper_dso2.so",
                "libh_helper_dso3.so",
        };
        test_dlclose_thread(dsos, __arraycount(dsos));
}

ATF_TC(dlclose_thread_recursive);
ATF_TC_HEAD(dlclose_thread_recursive, tc)
{
        atf_tc_set_md_var(tc, "descr",
            "Test concurrent dlopen/dlclose with recursive dlopen/dlclose");
        atf_tc_set_md_var(tc, "timeout", "20");
}
ATF_TC_BODY(dlclose_thread_recursive, tc)
{
        static const char *const dsos[] = {
                "libh_helper_dso1.so",
                "libh_helper_dso2.so",
                "libh_helper_dso3.so",
                "libh_helper_recurdso.so",
        };

        atf_tc_expect_fail("PR lib/59751: dlclose is not MT-safe"
            " depending on the libraries unloaded");

        test_dlclose_thread(dsos, __arraycount(dsos));
}

ATF_TC(dlclose_thread_recursive2);
ATF_TC_HEAD(dlclose_thread_recursive2, tc)
{
        atf_tc_set_md_var(tc, "descr",
            "Test concurrent dlopen/dlclose with recursive^2 dlopen/dlclose");
        atf_tc_set_md_var(tc, "timeout", "20");
}
ATF_TC_BODY(dlclose_thread_recursive2, tc)
{
        static const char *const dsos[] = {
                "libh_helper_dso1.so",
                "libh_helper_dso2.so",
                "libh_helper_dso3.so",
                "libh_helper_recurdso.so",
                "libh_helper_recurdso2.so",
        };

        atf_tc_expect_fail("PR lib/59751: dlclose is not MT-safe"
            " depending on the libraries unloaded");

        test_dlclose_thread(dsos, __arraycount(dsos));
}

ATF_TC(dlclose_recursive);
ATF_TC_HEAD(dlclose_recursive, tc)
{
        atf_tc_set_md_var(tc, "descr",
            "Test dlopen/dlclose with recursive dlopen/dlclose in init/fini");
        atf_tc_set_md_var(tc, "timeout", "20");
}
ATF_TC_BODY(dlclose_recursive, tc)
{
        timer_t t;
        struct sigevent sigev = {
                .sigev_notify = SIGEV_SIGNAL,
                .sigev_signo = SIGABRT, /* yields core dump -> stack trace */
        };
        const struct itimerspec it = {
                .it_value = {5,0},
                .it_interval = {0,0},
        };
        void *handle;
        int error;

        RL(timer_create(CLOCK_MONOTONIC, &sigev, &t));
        RL(timer_settime(t, TIMER_RELTIME, &it, NULL));

        /*
         * Really, the issue is the followup to the fix for the PR
         * which is that I broke recursive dlopen/dlclose!
         */
        atf_tc_expect_signal(SIGABRT, "PR lib/59751: dlclose is not MT-safe"
            " depending on the libraries unloaded");

        handle = dlopen("libh_helper_recurdso.so", RTLD_LAZY | RTLD_LOCAL);
        ATF_REQUIRE_MSG(handle != NULL, "%s", dlerror());
        ATF_REQUIRE_MSG((error = dlclose(handle)) == 0,
            "error=%d (%s)", error, dlerror());
}

ATF_TC(dlclose_recursive2);
ATF_TC_HEAD(dlclose_recursive2, tc)
{
        atf_tc_set_md_var(tc, "descr",
            "Test recursive dlopen/dlclose in init/fini with dependencies");
        atf_tc_set_md_var(tc, "timeout", "20");
}
ATF_TC_BODY(dlclose_recursive2, tc)
{
        timer_t t;
        struct sigevent sigev = {
                .sigev_notify = SIGEV_SIGNAL,
                .sigev_signo = SIGABRT, /* yields core dump -> stack trace */
        };
        const struct itimerspec it = {
                .it_value = {5,0},
                .it_interval = {0,0},
        };
        void *handle;
        int error;

        RL(timer_create(CLOCK_MONOTONIC, &sigev, &t));
        RL(timer_settime(t, TIMER_RELTIME, &it, NULL));

        /*
         * Really, the issue is the followup to the fix for the PR
         * which is that I broke recursive dlopen/dlclose!
         */
        atf_tc_expect_signal(SIGABRT, "PR lib/59751: dlclose is not MT-safe"
            " depending on the libraries unloaded");

        handle = dlopen("libh_helper_recurdso2.so", RTLD_LAZY | RTLD_LOCAL);
        ATF_REQUIRE_MSG(handle != NULL, "%s", dlerror());
        ATF_REQUIRE_MSG((error = dlclose(handle)) == 0,
            "error=%d (%s)", error, dlerror());
}

ATF_TP_ADD_TCS(tp)
{

        ATF_TP_ADD_TC(tp, dlclose_recursive);
        ATF_TP_ADD_TC(tp, dlclose_recursive2);
        ATF_TP_ADD_TC(tp, dlclose_thread);
        ATF_TP_ADD_TC(tp, dlclose_thread_recursive);
        ATF_TP_ADD_TC(tp, dlclose_thread_recursive2);
        return atf_no_error();
}