/*-
 *
 * Copyright (C) 2023 NetApp, Inc.
 *
 * SPDX-License-Identifier: BSD-2-Clause
 *
 */

#include <dlfcn.h>

#include <atf-c.h>

int get_value(void);
void set_value(int);

#define APP_VALUE       5
#define LIB_VALUE       20

ATF_TC_WITHOUT_HEAD(deepbind_simple);
ATF_TC_BODY(deepbind_simple, tc)
{
        void *hdl;
        void (*proxy_set_value)(int);
        int (*proxy_get_value)(void);
        int app_value, lib_value;

        set_value(APP_VALUE);

        /*
         * libdeep has a dependency on libval2.so, which is a rebuild of
         * libval.so that provides get_value() and set_value() for both us and
         * the lib.  The lib's get_value() and set_value() should bind to the
         * versions in libval2 instead of libval with RTLD_DEEPBIND.
         */
        hdl = dlopen("$ORIGIN/libdeep.so", RTLD_LAZY | RTLD_DEEPBIND);
        ATF_REQUIRE(hdl != NULL);

        proxy_set_value = dlsym(hdl, "proxy_set_value");
        ATF_REQUIRE(proxy_set_value != NULL);

        proxy_get_value = dlsym(hdl, "proxy_get_value");
        ATF_REQUIRE(proxy_get_value != NULL);

        (*proxy_set_value)(LIB_VALUE);

        lib_value = (*proxy_get_value)();
        app_value = get_value();

        /*
         * In the initial implementation or if libdeep.so is *not* linked
         * against its own libval2, then these both return the later set
         * LIB_VALUE (20) as they bind to the symbol provided by libval and
         * use its .bss val.
         */
        ATF_REQUIRE_INTEQ(lib_value, LIB_VALUE);
        ATF_REQUIRE_INTEQ(app_value, APP_VALUE);
}

ATF_TP_ADD_TCS(tp)
{

        ATF_TP_ADD_TC(tp, deepbind_simple);

        return atf_no_error();
}