| /* |
| * Copyright (C) 2012 The Android Open Source Project |
| * |
| * 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. |
| */ |
| |
| #include <gtest/gtest.h> |
| |
| #include <dlfcn.h> |
| #include <libgen.h> |
| #include <limits.h> |
| #include <stdio.h> |
| #include <stdint.h> |
| |
| #include <string> |
| |
| static bool gCalled = false; |
| extern "C" void DlSymTestFunction() { |
| gCalled = true; |
| } |
| |
| TEST(dlopen, dlsym_in_self) { |
| void* self = dlopen(NULL, RTLD_NOW); |
| ASSERT_TRUE(self != NULL); |
| |
| void* sym = dlsym(self, "DlSymTestFunction"); |
| ASSERT_TRUE(sym != NULL); |
| |
| void (*function)() = reinterpret_cast<void(*)()>(sym); |
| |
| gCalled = false; |
| function(); |
| ASSERT_TRUE(gCalled); |
| } |
| |
| TEST(dlopen, dladdr) { |
| void* self = dlopen(NULL, RTLD_NOW); |
| ASSERT_TRUE(self != NULL); |
| |
| void* sym = dlsym(self, "DlSymTestFunction"); |
| ASSERT_TRUE(sym != NULL); |
| |
| // Deliberately ask dladdr for an address inside a symbol, rather than the symbol base address. |
| void* addr = reinterpret_cast<void*>(reinterpret_cast<uintptr_t>(sym) + 2); |
| |
| Dl_info info; |
| int rc = dladdr(addr, &info); |
| ASSERT_NE(rc, 0); // Zero on error, non-zero on success. |
| |
| // Get the name of this executable. |
| char executable_path[PATH_MAX]; |
| rc = readlink("/proc/self/exe", executable_path, sizeof(executable_path)); |
| ASSERT_NE(rc, -1); |
| executable_path[rc] = '\0'; |
| std::string executable_name(basename(executable_path)); |
| |
| // The filename should be that of this executable. |
| // Note that we don't know whether or not we have the full path, so we want an "ends_with" test. |
| std::string dli_fname(info.dli_fname); |
| dli_fname = basename(&dli_fname[0]); |
| ASSERT_EQ(dli_fname, executable_name); |
| |
| // The symbol name should be the symbol we looked up. |
| ASSERT_STREQ(info.dli_sname, "DlSymTestFunction"); |
| |
| // The address should be the exact address of the symbol. |
| ASSERT_EQ(info.dli_saddr, sym); |
| |
| // Look in /proc/pid/maps to find out what address we were loaded at. |
| // TODO: factor /proc/pid/maps parsing out into a class and reuse all over bionic. |
| void* base_address = NULL; |
| char path[PATH_MAX]; |
| snprintf(path, sizeof(path), "/proc/%d/maps", getpid()); |
| char line[BUFSIZ]; |
| FILE* fp = fopen(path, "r"); |
| ASSERT_TRUE(fp != NULL); |
| while (fgets(line, sizeof(line), fp) != NULL) { |
| uintptr_t start = strtoul(line, 0, 16); |
| line[strlen(line) - 1] = '\0'; // Chomp the '\n'. |
| char* path = strchr(line, '/'); |
| if (path != NULL && strcmp(executable_path, path) == 0) { |
| base_address = reinterpret_cast<void*>(start); |
| break; |
| } |
| } |
| fclose(fp); |
| |
| // The base address should be the address we were loaded at. |
| ASSERT_EQ(info.dli_fbase, base_address); |
| } |
| |
| TEST(dlopen, dladdr_invalid) { |
| Dl_info info; |
| |
| // No symbol corresponding to NULL. |
| ASSERT_EQ(dladdr(NULL, &info), 0); // Zero on error, non-zero on success. |
| |
| // No symbol corresponding to a stack address. |
| ASSERT_EQ(dladdr(&info, &info), 0); // Zero on error, non-zero on success. |
| } |