1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 #include "base/test/multiprocess_test.h" 6 7 #include <unistd.h> 8 9 #include "base/containers/hash_tables.h" 10 #include "base/logging.h" 11 #include "base/posix/eintr_wrapper.h" 12 #include "testing/multiprocess_func_list.h" 13 14 namespace base { 15 16 // A very basic implementation for android. On Android tests can run in an APK 17 // and we don't have an executable to exec*. This implementation does the bare 18 // minimum to execute the method specified by procname (in the child process). 19 // - |debug_on_start| is ignored. 20 ProcessHandle MultiProcessTest::SpawnChildImpl( 21 const std::string& procname, 22 const FileHandleMappingVector& fds_to_remap, 23 bool debug_on_start) { 24 pid_t pid = fork(); 25 26 if (pid < 0) { 27 PLOG(ERROR) << "fork"; 28 return kNullProcessHandle; 29 } 30 if (pid > 0) { 31 // Parent process. 32 return pid; 33 } 34 // Child process. 35 std::hash_set<int> fds_to_keep_open; 36 for (FileHandleMappingVector::const_iterator it = fds_to_remap.begin(); 37 it != fds_to_remap.end(); ++it) { 38 fds_to_keep_open.insert(it->first); 39 } 40 // Keep stdin, stdout and stderr open since this is not meant to spawn a 41 // daemon. 42 const int kFdForAndroidLogging = 3; // FD used by __android_log_write(). 43 for (int fd = kFdForAndroidLogging + 1; fd < getdtablesize(); ++fd) { 44 if (fds_to_keep_open.find(fd) == fds_to_keep_open.end()) { 45 HANDLE_EINTR(close(fd)); 46 } 47 } 48 for (FileHandleMappingVector::const_iterator it = fds_to_remap.begin(); 49 it != fds_to_remap.end(); ++it) { 50 int old_fd = it->first; 51 int new_fd = it->second; 52 if (dup2(old_fd, new_fd) < 0) { 53 PLOG(FATAL) << "dup2"; 54 } 55 HANDLE_EINTR(close(old_fd)); 56 } 57 _exit(multi_process_function_list::InvokeChildProcessTest(procname)); 58 return 0; 59 } 60 61 } // namespace base 62
