111 lines
3.3 KiB
C++
111 lines
3.3 KiB
C++
/*
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* Copyright (C) 2012 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <gtest/gtest.h>
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#include <dlfcn.h>
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#include <libgen.h>
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#include <limits.h>
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#include <stdio.h>
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#include <stdint.h>
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#include <string>
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static bool gCalled = false;
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extern "C" void DlSymTestFunction() {
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gCalled = true;
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}
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TEST(dlopen, dlsym_in_self) {
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void* self = dlopen(NULL, RTLD_NOW);
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ASSERT_TRUE(self != NULL);
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void* sym = dlsym(self, "DlSymTestFunction");
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ASSERT_TRUE(sym != NULL);
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void (*function)() = reinterpret_cast<void(*)()>(sym);
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gCalled = false;
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function();
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ASSERT_TRUE(gCalled);
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}
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TEST(dlopen, dladdr) {
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void* self = dlopen(NULL, RTLD_NOW);
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ASSERT_TRUE(self != NULL);
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void* sym = dlsym(self, "DlSymTestFunction");
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ASSERT_TRUE(sym != NULL);
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// Deliberately ask dladdr for an address inside a symbol, rather than the symbol base address.
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void* addr = reinterpret_cast<void*>(reinterpret_cast<uintptr_t>(sym) + 2);
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Dl_info info;
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int rc = dladdr(addr, &info);
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ASSERT_NE(rc, 0); // Zero on error, non-zero on success.
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// Get the name of this executable.
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char executable_path[PATH_MAX];
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rc = readlink("/proc/self/exe", executable_path, sizeof(executable_path));
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ASSERT_NE(rc, -1);
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executable_path[rc] = '\0';
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std::string executable_name(basename(executable_path));
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// The filename should be that of this executable.
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// Note that we don't know whether or not we have the full path, so we want an "ends_with" test.
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std::string dli_fname(info.dli_fname);
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dli_fname = basename(&dli_fname[0]);
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ASSERT_EQ(dli_fname, executable_name);
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// The symbol name should be the symbol we looked up.
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ASSERT_STREQ(info.dli_sname, "DlSymTestFunction");
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// The address should be the exact address of the symbol.
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ASSERT_EQ(info.dli_saddr, sym);
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// Look in /proc/pid/maps to find out what address we were loaded at.
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// TODO: factor /proc/pid/maps parsing out into a class and reuse all over bionic.
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void* base_address = NULL;
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char path[PATH_MAX];
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snprintf(path, sizeof(path), "/proc/%d/maps", getpid());
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char line[BUFSIZ];
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FILE* fp = fopen(path, "r");
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ASSERT_TRUE(fp != NULL);
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while (fgets(line, sizeof(line), fp) != NULL) {
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uintptr_t start = strtoul(line, 0, 16);
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line[strlen(line) - 1] = '\0'; // Chomp the '\n'.
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char* path = strchr(line, '/');
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if (strcmp(executable_path, path) == 0) {
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base_address = reinterpret_cast<void*>(start);
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break;
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}
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}
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fclose(fp);
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// The base address should be the address we were loaded at.
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ASSERT_EQ(info.dli_fbase, base_address);
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}
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TEST(dlopen, dladdr_invalid) {
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Dl_info info;
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// No symbol corresponding to NULL.
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ASSERT_EQ(dladdr(NULL, &info), 0); // Zero on error, non-zero on success.
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// No symbol corresponding to a stack address.
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ASSERT_EQ(dladdr(&info, &info), 0); // Zero on error, non-zero on success.
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}
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