HostProcess ProcessLauncherAndroid::LaunchProcess(const ProcessLaunchInfo &launch_info, Error &error) { // TODO: Handle other launch parameters specified in launc_info char exe_path[PATH_MAX]; launch_info.GetExecutableFile().GetPath(exe_path, sizeof(exe_path)); lldb::pid_t pid = ::fork(); if (pid == static_cast<lldb::pid_t>(-1)) { // Fork failed error.SetErrorStringWithFormat("Fork failed with error message: %s", strerror(errno)); return HostProcess(LLDB_INVALID_PROCESS_ID); } else if (pid == 0) { if (const lldb_private::FileAction *file_action = launch_info.GetFileActionForFD(STDIN_FILENO)) { const char* path = file_action->GetPath(); if (path && ::strlen(path)) if (!DupDescriptor(path, STDIN_FILENO, O_RDONLY)) exit(-1); } if (const lldb_private::FileAction *file_action = launch_info.GetFileActionForFD(STDOUT_FILENO)) { const char* path = file_action->GetPath(); if (path && ::strlen(path)) if (!DupDescriptor(path, STDOUT_FILENO, O_WRONLY | O_CREAT | O_TRUNC)) exit(-1); } if (const lldb_private::FileAction *file_action = launch_info.GetFileActionForFD(STDERR_FILENO)) { const char* path = file_action->GetPath(); if (path && ::strlen(path)) if (!DupDescriptor(path, STDERR_FILENO, O_WRONLY | O_CREAT | O_TRUNC)) exit(-1); } // Child process const char **argv = launch_info.GetArguments().GetConstArgumentVector(); Args env = launch_info.GetEnvironmentEntries(); FixupEnvironment(env); const char **envp = env.GetConstArgumentVector(); const char *working_dir = launch_info.GetWorkingDirectory(); if (working_dir != nullptr && working_dir[0]) { if (::chdir(working_dir) != 0) exit(-1); } execve(argv[0], const_cast<char *const *>(argv), const_cast<char *const *>(envp)); exit(-1); } return HostProcess(pid); }
Error PlatformRemoteGDBServer::LaunchProcess (ProcessLaunchInfo &launch_info) { Error error; lldb::pid_t pid = LLDB_INVALID_PROCESS_ID; m_gdb_client.SetSTDIN ("/dev/null"); m_gdb_client.SetSTDOUT ("/dev/null"); m_gdb_client.SetSTDERR ("/dev/null"); m_gdb_client.SetDisableASLR (launch_info.GetFlags().Test (eLaunchFlagDisableASLR)); m_gdb_client.SetDetachOnError (launch_info.GetFlags().Test (eLaunchFlagDetachOnError)); const char *working_dir = launch_info.GetWorkingDirectory(); if (working_dir && working_dir[0]) { m_gdb_client.SetWorkingDir (working_dir); } // Send the environment and the program + arguments after we connect const char **envp = launch_info.GetEnvironmentEntries().GetConstArgumentVector(); if (envp) { const char *env_entry; for (int i=0; (env_entry = envp[i]); ++i) { if (m_gdb_client.SendEnvironmentPacket(env_entry) != 0) break; } } ArchSpec arch_spec = launch_info.GetArchitecture(); const char *arch_triple = arch_spec.GetTriple().str().c_str(); m_gdb_client.SendLaunchArchPacket(arch_triple); const uint32_t old_packet_timeout = m_gdb_client.SetPacketTimeout (5); int arg_packet_err = m_gdb_client.SendArgumentsPacket (launch_info); m_gdb_client.SetPacketTimeout (old_packet_timeout); if (arg_packet_err == 0) { std::string error_str; if (m_gdb_client.GetLaunchSuccess (error_str)) { pid = m_gdb_client.GetCurrentProcessID (); if (pid != LLDB_INVALID_PROCESS_ID) launch_info.SetProcessID (pid); } else { error.SetErrorString (error_str.c_str()); } } else { error.SetErrorStringWithFormat("'A' packet returned an error: %i", arg_packet_err); } return error; }
Error ProcessPOSIX::DoLaunch (Module *module, ProcessLaunchInfo &launch_info) { Error error; assert(m_monitor == NULL); const char* working_dir = launch_info.GetWorkingDirectory(); if (working_dir) { FileSpec WorkingDir(working_dir, true); if (!WorkingDir || WorkingDir.GetFileType() != FileSpec::eFileTypeDirectory) { error.SetErrorStringWithFormat("No such file or directory: %s", working_dir); return error; } } SetPrivateState(eStateLaunching); const lldb_private::FileAction *file_action; // Default of NULL will mean to use existing open file descriptors const char *stdin_path = NULL; const char *stdout_path = NULL; const char *stderr_path = NULL; const char * dbg_pts_path = launch_info.GetPTY().GetSlaveName(NULL,0); file_action = launch_info.GetFileActionForFD (STDIN_FILENO); stdin_path = GetFilePath(file_action, stdin_path, dbg_pts_path); file_action = launch_info.GetFileActionForFD (STDOUT_FILENO); stdout_path = GetFilePath(file_action, stdout_path, dbg_pts_path); file_action = launch_info.GetFileActionForFD (STDERR_FILENO); stderr_path = GetFilePath(file_action, stderr_path, dbg_pts_path); m_monitor = new ProcessMonitor (this, module, launch_info.GetArguments().GetConstArgumentVector(), launch_info.GetEnvironmentEntries().GetConstArgumentVector(), stdin_path, stdout_path, stderr_path, working_dir, launch_info, error); m_module = module; if (!error.Success()) return error; SetSTDIOFileDescriptor(m_monitor->GetTerminalFD()); SetID(m_monitor->GetPID()); return error; }
Error ProcessFreeBSD::DoLaunch (Module *module, ProcessLaunchInfo &launch_info) { Error error; assert(m_monitor == NULL); FileSpec working_dir = launch_info.GetWorkingDirectory(); if (working_dir && (!working_dir.ResolvePath() || working_dir.GetFileType() != FileSpec::eFileTypeDirectory)) { error.SetErrorStringWithFormat("No such file or directory: %s", working_dir.GetCString()); return error; } SetPrivateState(eStateLaunching); const lldb_private::FileAction *file_action; // Default of empty will mean to use existing open file descriptors FileSpec stdin_file_spec{}; FileSpec stdout_file_spec{}; FileSpec stderr_file_spec{}; const FileSpec dbg_pts_file_spec{launch_info.GetPTY().GetSlaveName(NULL,0), false}; file_action = launch_info.GetFileActionForFD (STDIN_FILENO); stdin_file_spec = GetFileSpec(file_action, stdin_file_spec, dbg_pts_file_spec); file_action = launch_info.GetFileActionForFD (STDOUT_FILENO); stdout_file_spec = GetFileSpec(file_action, stdout_file_spec, dbg_pts_file_spec); file_action = launch_info.GetFileActionForFD (STDERR_FILENO); stderr_file_spec = GetFileSpec(file_action, stderr_file_spec, dbg_pts_file_spec); m_monitor = new ProcessMonitor(this, module, launch_info.GetArguments().GetConstArgumentVector(), launch_info.GetEnvironmentEntries().GetConstArgumentVector(), stdin_file_spec, stdout_file_spec, stderr_file_spec, working_dir, launch_info, error); m_module = module; if (!error.Success()) return error; int terminal = m_monitor->GetTerminalFD(); if (terminal >= 0) { // The reader thread will close the file descriptor when done, so we pass it a copy. int stdio = fcntl(terminal, F_DUPFD_CLOEXEC, 0); if (stdio == -1) { error.SetErrorToErrno(); return error; } SetSTDIOFileDescriptor(stdio); } SetID(m_monitor->GetPID()); return error; }
Error Host::LaunchProcessPosixSpawn(const char *exe_path, const ProcessLaunchInfo &launch_info, lldb::pid_t &pid) { Error error; Log *log(lldb_private::GetLogIfAllCategoriesSet (LIBLLDB_LOG_HOST | LIBLLDB_LOG_PROCESS)); posix_spawnattr_t attr; error.SetError( ::posix_spawnattr_init (&attr), eErrorTypePOSIX); if (error.Fail() || log) error.PutToLog(log, "::posix_spawnattr_init ( &attr )"); if (error.Fail()) return error; // Make a quick class that will cleanup the posix spawn attributes in case // we return in the middle of this function. lldb_utility::CleanUp <posix_spawnattr_t *, int> posix_spawnattr_cleanup(&attr, posix_spawnattr_destroy); sigset_t no_signals; sigset_t all_signals; sigemptyset (&no_signals); sigfillset (&all_signals); ::posix_spawnattr_setsigmask(&attr, &no_signals); #if defined (__linux__) || defined (__FreeBSD__) ::posix_spawnattr_setsigdefault(&attr, &no_signals); #else ::posix_spawnattr_setsigdefault(&attr, &all_signals); #endif short flags = GetPosixspawnFlags(launch_info); error.SetError( ::posix_spawnattr_setflags (&attr, flags), eErrorTypePOSIX); if (error.Fail() || log) error.PutToLog(log, "::posix_spawnattr_setflags ( &attr, flags=0x%8.8x )", flags); if (error.Fail()) return error; // posix_spawnattr_setbinpref_np appears to be an Apple extension per: // http://www.unix.com/man-page/OSX/3/posix_spawnattr_setbinpref_np/ #if defined (__APPLE__) && !defined (__arm__) // Don't set the binpref if a shell was provided. After all, that's only going to affect what version of the shell // is launched, not what fork of the binary is launched. We insert "arch --arch <ARCH> as part of the shell invocation // to do that job on OSX. if (launch_info.GetShell() == nullptr) { // We don't need to do this for ARM, and we really shouldn't now that we // have multiple CPU subtypes and no posix_spawnattr call that allows us // to set which CPU subtype to launch... const ArchSpec &arch_spec = launch_info.GetArchitecture(); cpu_type_t cpu = arch_spec.GetMachOCPUType(); cpu_type_t sub = arch_spec.GetMachOCPUSubType(); if (cpu != 0 && cpu != static_cast<cpu_type_t>(UINT32_MAX) && cpu != static_cast<cpu_type_t>(LLDB_INVALID_CPUTYPE) && !(cpu == 0x01000007 && sub == 8)) // If haswell is specified, don't try to set the CPU type or we will fail { size_t ocount = 0; error.SetError( ::posix_spawnattr_setbinpref_np (&attr, 1, &cpu, &ocount), eErrorTypePOSIX); if (error.Fail() || log) error.PutToLog(log, "::posix_spawnattr_setbinpref_np ( &attr, 1, cpu_type = 0x%8.8x, count => %llu )", cpu, (uint64_t)ocount); if (error.Fail() || ocount != 1) return error; } } #endif const char *tmp_argv[2]; char * const *argv = (char * const*)launch_info.GetArguments().GetConstArgumentVector(); char * const *envp = (char * const*)launch_info.GetEnvironmentEntries().GetConstArgumentVector(); if (argv == NULL) { // posix_spawn gets very unhappy if it doesn't have at least the program // name in argv[0]. One of the side affects I have noticed is the environment // variables don't make it into the child process if "argv == NULL"!!! tmp_argv[0] = exe_path; tmp_argv[1] = NULL; argv = (char * const*)tmp_argv; } #if !defined (__APPLE__) // manage the working directory char current_dir[PATH_MAX]; current_dir[0] = '\0'; #endif FileSpec working_dir{launch_info.GetWorkingDirectory()}; if (working_dir) { #if defined (__APPLE__) // Set the working directory on this thread only if (__pthread_chdir(working_dir.GetCString()) < 0) { if (errno == ENOENT) { error.SetErrorStringWithFormat("No such file or directory: %s", working_dir.GetCString()); } else if (errno == ENOTDIR) { error.SetErrorStringWithFormat("Path doesn't name a directory: %s", working_dir.GetCString()); } else { error.SetErrorStringWithFormat("An unknown error occurred when changing directory for process execution."); } return error; } #else if (::getcwd(current_dir, sizeof(current_dir)) == NULL) { error.SetError(errno, eErrorTypePOSIX); error.LogIfError(log, "unable to save the current directory"); return error; } if (::chdir(working_dir.GetCString()) == -1) { error.SetError(errno, eErrorTypePOSIX); error.LogIfError(log, "unable to change working directory to %s", working_dir.GetCString()); return error; } #endif } ::pid_t result_pid = LLDB_INVALID_PROCESS_ID; const size_t num_file_actions = launch_info.GetNumFileActions (); if (num_file_actions > 0) { posix_spawn_file_actions_t file_actions; error.SetError( ::posix_spawn_file_actions_init (&file_actions), eErrorTypePOSIX); if (error.Fail() || log) error.PutToLog(log, "::posix_spawn_file_actions_init ( &file_actions )"); if (error.Fail()) return error; // Make a quick class that will cleanup the posix spawn attributes in case // we return in the middle of this function. lldb_utility::CleanUp <posix_spawn_file_actions_t *, int> posix_spawn_file_actions_cleanup (&file_actions, posix_spawn_file_actions_destroy); for (size_t i=0; i<num_file_actions; ++i) { const FileAction *launch_file_action = launch_info.GetFileActionAtIndex(i); if (launch_file_action) { if (!AddPosixSpawnFileAction(&file_actions, launch_file_action, log, error)) return error; } } error.SetError(::posix_spawnp(&result_pid, exe_path, &file_actions, &attr, argv, envp), eErrorTypePOSIX); if (error.Fail() || log) { error.PutToLog(log, "::posix_spawnp ( pid => %i, path = '%s', file_actions = %p, attr = %p, argv = %p, envp = %p )", result_pid, exe_path, static_cast<void *>(&file_actions), static_cast<void *>(&attr), reinterpret_cast<const void *>(argv), reinterpret_cast<const void *>(envp)); if (log) { for (int ii=0; argv[ii]; ++ii) log->Printf("argv[%i] = '%s'", ii, argv[ii]); } } } else { error.SetError(::posix_spawnp(&result_pid, exe_path, NULL, &attr, argv, envp), eErrorTypePOSIX); if (error.Fail() || log) { error.PutToLog(log, "::posix_spawnp ( pid => %i, path = '%s', file_actions = NULL, attr = %p, argv = %p, envp = %p )", result_pid, exe_path, static_cast<void *>(&attr), reinterpret_cast<const void *>(argv), reinterpret_cast<const void *>(envp)); if (log) { for (int ii=0; argv[ii]; ++ii) log->Printf("argv[%i] = '%s'", ii, argv[ii]); } } } pid = result_pid; if (working_dir) { #if defined (__APPLE__) // No more thread specific current working directory __pthread_fchdir (-1); #else if (::chdir(current_dir) == -1 && error.Success()) { error.SetError(errno, eErrorTypePOSIX); error.LogIfError(log, "unable to change current directory back to %s", current_dir); } #endif } return error; }
Error PlatformRemoteGDBServer::LaunchProcess (ProcessLaunchInfo &launch_info) { Log *log(GetLogIfAllCategoriesSet (LIBLLDB_LOG_PLATFORM)); Error error; if (log) log->Printf ("PlatformRemoteGDBServer::%s() called", __FUNCTION__); auto num_file_actions = launch_info.GetNumFileActions (); for (decltype(num_file_actions) i = 0; i < num_file_actions; ++i) { const auto file_action = launch_info.GetFileActionAtIndex (i); if (file_action->GetAction () != FileAction::eFileActionOpen) continue; switch(file_action->GetFD()) { case STDIN_FILENO: m_gdb_client.SetSTDIN(file_action->GetFileSpec()); break; case STDOUT_FILENO: m_gdb_client.SetSTDOUT(file_action->GetFileSpec()); break; case STDERR_FILENO: m_gdb_client.SetSTDERR(file_action->GetFileSpec()); break; } } m_gdb_client.SetDisableASLR (launch_info.GetFlags().Test (eLaunchFlagDisableASLR)); m_gdb_client.SetDetachOnError (launch_info.GetFlags().Test (eLaunchFlagDetachOnError)); FileSpec working_dir = launch_info.GetWorkingDirectory(); if (working_dir) { m_gdb_client.SetWorkingDir(working_dir); } // Send the environment and the program + arguments after we connect const char **envp = launch_info.GetEnvironmentEntries().GetConstArgumentVector(); if (envp) { const char *env_entry; for (int i=0; (env_entry = envp[i]); ++i) { if (m_gdb_client.SendEnvironmentPacket(env_entry) != 0) break; } } ArchSpec arch_spec = launch_info.GetArchitecture(); const char *arch_triple = arch_spec.GetTriple().str().c_str(); m_gdb_client.SendLaunchArchPacket(arch_triple); if (log) log->Printf ("PlatformRemoteGDBServer::%s() set launch architecture triple to '%s'", __FUNCTION__, arch_triple ? arch_triple : "<NULL>"); int arg_packet_err; { // Scope for the scoped timeout object process_gdb_remote::GDBRemoteCommunication::ScopedTimeout timeout(m_gdb_client, 5); arg_packet_err = m_gdb_client.SendArgumentsPacket (launch_info); } if (arg_packet_err == 0) { std::string error_str; if (m_gdb_client.GetLaunchSuccess (error_str)) { const auto pid = m_gdb_client.GetCurrentProcessID (false); if (pid != LLDB_INVALID_PROCESS_ID) { launch_info.SetProcessID (pid); if (log) log->Printf ("PlatformRemoteGDBServer::%s() pid %" PRIu64 " launched successfully", __FUNCTION__, pid); } else { if (log) log->Printf ("PlatformRemoteGDBServer::%s() launch succeeded but we didn't get a valid process id back!", __FUNCTION__); error.SetErrorString ("failed to get PID"); } } else { error.SetErrorString (error_str.c_str()); if (log) log->Printf ("PlatformRemoteGDBServer::%s() launch failed: %s", __FUNCTION__, error.AsCString ()); } } else { error.SetErrorStringWithFormat("'A' packet returned an error: %i", arg_packet_err); } return error; }
static void LLVM_ATTRIBUTE_NORETURN ChildFunc(int error_fd, const ProcessLaunchInfo &info) { // First, make sure we disable all logging. If we are logging to stdout, our // logs can be // mistaken for inferior output. Log::DisableAllLogChannels(nullptr); // Do not inherit setgid powers. if (setgid(getgid()) != 0) ExitWithError(error_fd, "setgid"); if (info.GetFlags().Test(eLaunchFlagLaunchInSeparateProcessGroup)) { if (setpgid(0, 0) != 0) ExitWithError(error_fd, "setpgid"); } for (size_t i = 0; i < info.GetNumFileActions(); ++i) { const FileAction &action = *info.GetFileActionAtIndex(i); switch (action.GetAction()) { case FileAction::eFileActionClose: if (close(action.GetFD()) != 0) ExitWithError(error_fd, "close"); break; case FileAction::eFileActionDuplicate: if (dup2(action.GetFD(), action.GetActionArgument()) == -1) ExitWithError(error_fd, "dup2"); break; case FileAction::eFileActionOpen: DupDescriptor(error_fd, action.GetFileSpec(), action.GetFD(), action.GetActionArgument()); break; case FileAction::eFileActionNone: break; } } const char **argv = info.GetArguments().GetConstArgumentVector(); // Change working directory if (info.GetWorkingDirectory() && 0 != ::chdir(info.GetWorkingDirectory().GetCString())) ExitWithError(error_fd, "chdir"); // Disable ASLR if requested. if (info.GetFlags().Test(lldb::eLaunchFlagDisableASLR)) { const unsigned long personality_get_current = 0xffffffff; int value = personality(personality_get_current); if (value == -1) ExitWithError(error_fd, "personality get"); value = personality(ADDR_NO_RANDOMIZE | value); if (value == -1) ExitWithError(error_fd, "personality set"); } Args env = info.GetEnvironmentEntries(); FixupEnvironment(env); const char **envp = env.GetConstArgumentVector(); // Clear the signal mask to prevent the child from being affected by // any masking done by the parent. sigset_t set; if (sigemptyset(&set) != 0 || pthread_sigmask(SIG_SETMASK, &set, nullptr) != 0) ExitWithError(error_fd, "pthread_sigmask"); if (info.GetFlags().Test(eLaunchFlagDebug)) { // HACK: // Close everything besides stdin, stdout, and stderr that has no file // action to avoid leaking. Only do this when debugging, as elsewhere we // actually rely on // passing open descriptors to child processes. for (int fd = 3; fd < sysconf(_SC_OPEN_MAX); ++fd) if (!info.GetFileActionForFD(fd) && fd != error_fd) close(fd); // Start tracing this child that is about to exec. if (ptrace(PTRACE_TRACEME, 0, nullptr, nullptr) == -1) ExitWithError(error_fd, "ptrace"); } // Execute. We should never return... execve(argv[0], const_cast<char *const *>(argv), const_cast<char *const *>(envp)); if (errno == ETXTBSY) { // On android M and earlier we can get this error because the adb deamon can // hold a write // handle on the executable even after it has finished uploading it. This // state lasts // only a short time and happens only when there are many concurrent adb // commands being // issued, such as when running the test suite. (The file remains open when // someone does // an "adb shell" command in the fork() child before it has had a chance to // exec.) Since // this state should clear up quickly, wait a while and then give it one // more go. usleep(50000); execve(argv[0], const_cast<char *const *>(argv), const_cast<char *const *>(envp)); } // ...unless exec fails. In which case we definitely need to end the child // here. ExitWithError(error_fd, "execve"); }
Error PlatformRemoteGDBServer::LaunchProcess (ProcessLaunchInfo &launch_info) { Log *log(lldb_private::GetLogIfAllCategoriesSet (LIBLLDB_LOG_PLATFORM)); Error error; lldb::pid_t pid = LLDB_INVALID_PROCESS_ID; if (log) log->Printf ("PlatformRemoteGDBServer::%s() called", __FUNCTION__); m_gdb_client.SetSTDIN ("/dev/null"); m_gdb_client.SetSTDOUT ("/dev/null"); m_gdb_client.SetSTDERR ("/dev/null"); m_gdb_client.SetDisableASLR (launch_info.GetFlags().Test (eLaunchFlagDisableASLR)); m_gdb_client.SetDetachOnError (launch_info.GetFlags().Test (eLaunchFlagDetachOnError)); const char *working_dir = launch_info.GetWorkingDirectory(); if (working_dir && working_dir[0]) { m_gdb_client.SetWorkingDir (working_dir); } // Send the environment and the program + arguments after we connect const char **envp = launch_info.GetEnvironmentEntries().GetConstArgumentVector(); if (envp) { const char *env_entry; for (int i=0; (env_entry = envp[i]); ++i) { if (m_gdb_client.SendEnvironmentPacket(env_entry) != 0) break; } } ArchSpec arch_spec = launch_info.GetArchitecture(); const char *arch_triple = arch_spec.GetTriple().str().c_str(); m_gdb_client.SendLaunchArchPacket(arch_triple); if (log) log->Printf ("PlatformRemoteGDBServer::%s() set launch architecture triple to '%s'", __FUNCTION__, arch_triple ? arch_triple : "<NULL>"); const uint32_t old_packet_timeout = m_gdb_client.SetPacketTimeout (5); int arg_packet_err = m_gdb_client.SendArgumentsPacket (launch_info); m_gdb_client.SetPacketTimeout (old_packet_timeout); if (arg_packet_err == 0) { std::string error_str; if (m_gdb_client.GetLaunchSuccess (error_str)) { pid = m_gdb_client.GetCurrentProcessID (); if (pid != LLDB_INVALID_PROCESS_ID) { launch_info.SetProcessID (pid); if (log) log->Printf ("PlatformRemoteGDBServer::%s() pid %" PRIu64 " launched successfully", __FUNCTION__, pid); } else { if (log) log->Printf ("PlatformRemoteGDBServer::%s() launch succeeded but we didn't get a valid process id back!", __FUNCTION__); // FIXME isn't this an error condition? Do we need to set an error here? Check with Greg. } } else { error.SetErrorString (error_str.c_str()); if (log) log->Printf ("PlatformRemoteGDBServer::%s() launch failed: %s", __FUNCTION__, error.AsCString ()); } } else { error.SetErrorStringWithFormat("'A' packet returned an error: %i", arg_packet_err); } return error; }