mirror of
https://github.com/RGBCube/serenity
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02018af0cc
This is a test program anyway, so let's double check that the auxv is done properly here.
123 lines
No EOL
4.2 KiB
C++
123 lines
No EOL
4.2 KiB
C++
/*
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* Copyright (c) 2019-2020, Andrew Kaster <andrewdkaster@gmail.com>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <AK/String.h>
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#include <LibELF/AuxiliaryVector.h>
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#include <dlfcn.h>
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#include <stdio.h>
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int main(int argc, char** argv, char** envp)
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{
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for (int i = 0; i < argc; ++i) {
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printf("argv[%d]: %s\n", i, argv[i]);
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}
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char** env;
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for (env = envp; *env; ++env) {
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printf("env: %s\n", *env);
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}
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for (auxv_t* auxvp = (auxv_t*)++env; auxvp->a_type != AT_NULL; ++auxvp) {
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printf("AuxVal: Type=%ld, Val/Ptr=%p\n", auxvp->a_type, auxvp->a_un.a_ptr);
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if (auxvp->a_type == AT_PLATFORM) {
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printf(" Platform: %s\n", (char*)auxvp->a_un.a_ptr);
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} else if (auxvp->a_type == AT_EXECFN) {
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printf(" Filename: %s\n", (char*)auxvp->a_un.a_ptr);
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} else if (auxvp->a_type == AT_RANDOM) {
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auto byte_ptr = (uint8_t*)auxvp->a_un.a_ptr;
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printf(" My Random bytes are: ");
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for (size_t i = 0; i < 16; ++i) {
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printf("0x%2x ", byte_ptr[i]);
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}
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printf("\n");
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}
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}
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void* handle = dlopen("/usr/lib/libDynamicLib.so", RTLD_LAZY | RTLD_GLOBAL);
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if (!handle) {
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printf("Failed to dlopen! %s\n", dlerror());
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return 1;
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}
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// Test getting an external variable from the library and read it out
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int* ptr_global = (int*)dlsym(handle, "global_lib_variable");
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if (!ptr_global) {
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printf("Failed to dlsym for \"global_lib_variable\"! %s\n", dlerror());
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return 2;
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}
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printf("Found global lib variable address: %p\n", ptr_global);
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printf("Global lib variable is %d\n", *ptr_global);
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// Test getting a method from the library and calling it
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void (*lib_func)(void) = (void (*)(void))dlsym(handle, "global_lib_function");
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printf("Found global lib function address: %p\n", lib_func);
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if (!lib_func) {
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printf("Failed to dlsym for \"global_lib_function\"! %s\n", dlerror());
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return 2;
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}
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lib_func();
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printf("I think I called my lib function!\n");
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// Test getting a method that takes and returns arugments now
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const char* (*other_func)(int) = (const char* (*)(int))dlsym(handle, "other_lib_function");
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printf("Found other lib function address %p\n", other_func);
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if (!other_func) {
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printf("Failed to dlsym for \"other_lib_function\"! %s\n", dlerror());
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return 2;
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}
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// Call it twice with different arguments
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String formatted_result = other_func(10);
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printf("(%d + %d = %d) %s\n", *ptr_global, 10, *ptr_global + 10, formatted_result.characters());
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*ptr_global = 17;
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formatted_result = other_func(5);
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printf("(%d + %d = %d) %s\n", *ptr_global, 5, *ptr_global + 5, formatted_result.characters());
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int ret = dlclose(handle);
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if (ret < 0) {
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printf("Failed to dlclose! %s\n", dlerror());
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return 3;
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}
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printf("Bye for now!\n");
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return 0;
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} |