base/test/multiprocess_test_android.cc

   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/base_switches.h"
  10 #include "base/command_line.h"
  11 #include "base/containers/hash_tables.h"
  12 #include "base/logging.h"
  13 #include "base/posix/global_descriptors.h"
  14 #include "testing/multiprocess_func_list.h"
  15
  16 namespace base {
  17
  18 // A very basic implementation for Android. On Android tests can run in an APK
  19 // and we don't have an executable to exec*. This implementation does the bare
  20 // minimum to execute the method specified by procname (in the child process).
  21 //  - All options except |fds_to_remap| are ignored.
  22 Process SpawnMultiProcessTestChild(const std::string& procname,
  23                                    const CommandLine& base_command_line,
  24                                    const LaunchOptions& options) {
  25   // TODO(viettrungluu): The FD-remapping done below is wrong in the presence of
  26   // cycles (e.g., fd1 -> fd2, fd2 -> fd1). crbug.com/326576
  27   FileHandleMappingVector empty;
  28   const FileHandleMappingVector* fds_to_remap =
  29       options.fds_to_remap ? options.fds_to_remap : &empty;
  30
  31   pid_t pid = fork();
  32
  33   if (pid < 0) {
  34     PLOG(ERROR) << "fork";
  35     return Process();
  36   }
  37   if (pid > 0) {
  38     // Parent process.
  39     return Process(pid);
  40   }
  41   // Child process.
  42   base::hash_set<int> fds_to_keep_open;
  43   for (FileHandleMappingVector::const_iterator it = fds_to_remap->begin();
  44        it != fds_to_remap->end(); ++it) {
  45     fds_to_keep_open.insert(it->first);
  46   }
  47   // Keep standard FDs (stdin, stdout, stderr, etc.) open since this
  48   // is not meant to spawn a daemon.
  49   int base = GlobalDescriptors::kBaseDescriptor;
  50   for (int fd = base; fd < sysconf(_SC_OPEN_MAX); ++fd) {
  51     if (fds_to_keep_open.find(fd) == fds_to_keep_open.end()) {
  52       close(fd);
  53     }
  54   }
  55   for (FileHandleMappingVector::const_iterator it = fds_to_remap->begin();
  56        it != fds_to_remap->end(); ++it) {
  57     int old_fd = it->first;
  58     int new_fd = it->second;
  59     if (dup2(old_fd, new_fd) < 0) {
  60       PLOG(FATAL) << "dup2";
  61     }
  62     close(old_fd);
  63   }
  64   CommandLine::Reset();
  65   CommandLine::Init(0, nullptr);
  66   CommandLine* command_line = CommandLine::ForCurrentProcess();
  67   command_line->InitFromArgv(base_command_line.argv());
  68   if (!command_line->HasSwitch(switches::kTestChildProcess))
  69     command_line->AppendSwitchASCII(switches::kTestChildProcess, procname);
  70
  71   _exit(multi_process_function_list::InvokeChildProcessTest(procname));
  72   return Process();
  73 }
  74
  75 }  // namespace base