dlopen-test.c

/* vim: set expandtab tabstop=4 softtabstop=4 shiftwidth=4: */
/*
 * Copyright © 2016 Intel Corporation
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice (including the next
 * paragraph) shall be included in all copies or substantial portions of the
 * Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
 * IN THE SOFTWARE.
 */

#include <stdio.h>
#include <stdlib.h>

#include "build-id.h"

int
main(int argc, char *argv[])
{
    const struct build_id_note *
        (*build_id_find_nhdr_by_name)(const char *name);
    const struct build_id_note *
        (*build_id_find_nhdr_by_symbol)(const void *symbol);
    ElfW(Word)
        (*build_id_length)(const struct build_id_note *note);
    const uint8_t *
        (*build_id_data)(const struct build_id_note *note);

    void *handle = dlopen("./libbuild-id.so", RTLD_LAZY);
    if (!handle)
        return -1;

    build_id_find_nhdr_by_name = dlsym(handle, "build_id_find_nhdr_by_name");
    build_id_find_nhdr_by_symbol = dlsym(handle, "build_id_find_nhdr_by_symbol");
    build_id_length = dlsym(handle, "build_id_length");
    build_id_data = dlsym(handle, "build_id_data");

    if (dlerror())
        return -1;

    const struct build_id_note *note =
        build_id_find_nhdr_by_name("./libbuild-id.so");
    if (!note)
        return -1;

    const struct build_id_note *note_by_symbol =
        build_id_find_nhdr_by_symbol(build_id_length);
    if (note != note_by_symbol)
        return -1;

    ElfW(Word) len = build_id_length(note);

    const uint8_t *build_id = build_id_data(note);

    printf("Build ID: ");
    for (ElfW(Word) i = 0; i < len; i++) {
        printf("%02x", build_id[i]);
    }
    printf("\n");
    dlclose(handle);
    return 0;
}