1 // Copyright (C) 2012 The Android Open Source Project 2 // All rights reserved. 3 // 4 // Redistribution and use in source and binary forms, with or without 5 // modification, are permitted provided that the following conditions 6 // are met: 7 // 1. Redistributions of source code must retain the above copyright 8 // notice, this list of conditions and the following disclaimer. 9 // 2. Redistributions in binary form must reproduce the above copyright 10 // notice, this list of conditions and the following disclaimer in the 11 // documentation and/or other materials provided with the distribution. 12 // 3. Neither the name of the project nor the names of its contributors 13 // may be used to endorse or promote products derived from this software 14 // without specific prior written permission. 15 // 16 // THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 17 // ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 // IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 // ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 20 // FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 // DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 // OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 // HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 // LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 // OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 // SUCH DAMAGE. 27 28 #include <android/log.h> 29 #include <dlfcn.h> 30 #include <stdio.h> 31 32 #include "cxxabi_defines.h" 33 34 namespace __gabixx { 35 36 _GABIXX_NORETURN void __fatal_error(const char* message) { 37 38 // Note: Printing to stderr is only useful when running an executable 39 // from a shell, e.g. when using 'adb shell'. For regular 40 // applications, stderr is redirected to /dev/null by default. 41 fprintf(stderr, "PANIC:GAbi++:%s\n", message); 42 43 // Always print the message to the log, when possible. Use 44 // dlopen()/dlsym() to avoid adding an explicit dependency 45 // to -llog in GAbi++ for this sole feature. 46 // 47 // An explicit dependency to -ldl can be avoided because these 48 // functions are implemented directly by the dynamic linker. 49 // That is, except when this code is linked into a static 50 // executable. In this case, adding -ldl to the final link command 51 // will be necessary, but the dlopen() will always return NULL. 52 // 53 // There is unfortunately no way to detect where this code is going 54 // to be used at compile time, but static executables are strongly 55 // discouraged on the platform because they can't implement ASLR. 56 // 57 typedef void (*logfunc_t)(int, const char*, const char*); 58 logfunc_t logger = NULL; 59 60 // Note that this should always succeed in a regular application, 61 // because the library is already loaded into the process' address 62 // space by Zygote before forking the application process. 63 // This will fail in static executables, because the static 64 // version of -ldl only contains empty stubs. 65 void* liblog = dlopen("liblog.so", RTLD_NOW); 66 67 if (liblog != NULL) { 68 logger = reinterpret_cast<logfunc_t>(dlsym(liblog, "__android_log_print")); 69 if (logger != NULL) { 70 (*logger)(ANDROID_LOG_FATAL, "GAbi++", message); 71 } 72 dlclose(liblog); 73 } 74 75 std::terminate(); 76 } 77 78 } // namespace __gabixx 79
