| /* |
| * Copyright (C) 2015 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| // Functionality for launching and managing shell subprocesses. |
| // |
| // There are two types of subprocesses, PTY or raw. PTY is typically used for |
| // an interactive session, raw for non-interactive. There are also two methods |
| // of communication with the subprocess, passing raw data or using a simple |
| // protocol to wrap packets. The protocol allows separating stdout/stderr and |
| // passing the exit code back, but is not backwards compatible. |
| // ----------------+-------------------------------------- |
| // Type Protocol | Exit code? Separate stdout/stderr? |
| // ----------------+-------------------------------------- |
| // PTY No | No No |
| // Raw No | No No |
| // PTY Yes | Yes No |
| // Raw Yes | Yes Yes |
| // ----------------+-------------------------------------- |
| // |
| // Non-protocol subprocesses work by passing subprocess stdin/out/err through |
| // a single pipe which is registered with a local socket in adbd. The local |
| // socket uses the fdevent loop to pass raw data between this pipe and the |
| // transport, which then passes data back to the adb client. Cleanup is done by |
| // waiting in a separate thread for the subprocesses to exit and then signaling |
| // a separate fdevent to close out the local socket from the main loop. |
| // |
| // ------------------+-------------------------+------------------------------ |
| // Subprocess | adbd subprocess thread | adbd main fdevent loop |
| // ------------------+-------------------------+------------------------------ |
| // | | |
| // stdin/out/err <-----------------------------> LocalSocket |
| // | | | |
| // | | Block on exit | |
| // | | * | |
| // v | * | |
| // Exit ---> Unblock | |
| // | | | |
| // | v | |
| // | Notify shell exit FD ---> Close LocalSocket |
| // ------------------+-------------------------+------------------------------ |
| // |
| // The protocol requires the thread to intercept stdin/out/err in order to |
| // wrap/unwrap data with shell protocol packets. |
| // |
| // ------------------+-------------------------+------------------------------ |
| // Subprocess | adbd subprocess thread | adbd main fdevent loop |
| // ------------------+-------------------------+------------------------------ |
| // | | |
| // stdin/out <---> Protocol <---> LocalSocket |
| // stderr ---> Protocol ---> LocalSocket |
| // | | | |
| // v | | |
| // Exit ---> Exit code protocol ---> LocalSocket |
| // | | | |
| // | v | |
| // | Notify shell exit FD ---> Close LocalSocket |
| // ------------------+-------------------------+------------------------------ |
| // |
| // An alternate approach is to put the protocol wrapping/unwrapping in the main |
| // fdevent loop, which has the advantage of being able to re-use the existing |
| // select() code for handling data streams. However, implementation turned out |
| // to be more complex due to partial reads and non-blocking I/O so this model |
| // was chosen instead. |
| |
| #define TRACE_TAG SHELL |
| |
| #include "sysdeps.h" |
| |
| #include "shell_service.h" |
| |
| #include <errno.h> |
| #include <pty.h> |
| #include <pwd.h> |
| #include <sys/select.h> |
| #include <termios.h> |
| |
| #include <memory> |
| #include <string> |
| #include <unordered_map> |
| #include <vector> |
| |
| #include <android-base/logging.h> |
| #include <android-base/stringprintf.h> |
| #include <paths.h> |
| |
| #include "adb.h" |
| #include "adb_io.h" |
| #include "adb_trace.h" |
| #include "adb_utils.h" |
| |
| namespace { |
| |
| void init_subproc_child() |
| { |
| setsid(); |
| |
| // Set OOM score adjustment to prevent killing |
| int fd = adb_open("/proc/self/oom_score_adj", O_WRONLY | O_CLOEXEC); |
| if (fd >= 0) { |
| adb_write(fd, "0", 1); |
| adb_close(fd); |
| } else { |
| D("adb: unable to update oom_score_adj"); |
| } |
| } |
| |
| // Reads from |fd| until close or failure. |
| std::string ReadAll(int fd) { |
| char buffer[512]; |
| std::string received; |
| |
| while (1) { |
| int bytes = adb_read(fd, buffer, sizeof(buffer)); |
| if (bytes <= 0) { |
| break; |
| } |
| received.append(buffer, bytes); |
| } |
| |
| return received; |
| } |
| |
| // Helper to automatically close an FD when it goes out of scope. |
| class ScopedFd { |
| public: |
| ScopedFd() {} |
| ~ScopedFd() { Reset(); } |
| |
| void Reset(int fd=-1) { |
| if (fd != fd_) { |
| if (valid()) { |
| adb_close(fd_); |
| } |
| fd_ = fd; |
| } |
| } |
| |
| int Release() { |
| int temp = fd_; |
| fd_ = -1; |
| return temp; |
| } |
| |
| bool valid() const { return fd_ >= 0; } |
| |
| int fd() const { return fd_; } |
| |
| private: |
| int fd_ = -1; |
| |
| DISALLOW_COPY_AND_ASSIGN(ScopedFd); |
| }; |
| |
| // Creates a socketpair and saves the endpoints to |fd1| and |fd2|. |
| bool CreateSocketpair(ScopedFd* fd1, ScopedFd* fd2) { |
| int sockets[2]; |
| if (adb_socketpair(sockets) < 0) { |
| PLOG(ERROR) << "cannot create socket pair"; |
| return false; |
| } |
| fd1->Reset(sockets[0]); |
| fd2->Reset(sockets[1]); |
| return true; |
| } |
| |
| class Subprocess { |
| public: |
| Subprocess(const std::string& command, const char* terminal_type, |
| SubprocessType type, SubprocessProtocol protocol); |
| ~Subprocess(); |
| |
| const std::string& command() const { return command_; } |
| |
| int local_socket_fd() const { return local_socket_sfd_.fd(); } |
| |
| pid_t pid() const { return pid_; } |
| |
| // Sets up FDs, forks a subprocess, starts the subprocess manager thread, |
| // and exec's the child. Returns false on failure. |
| bool ForkAndExec(); |
| |
| private: |
| // Opens the file at |pts_name|. |
| int OpenPtyChildFd(const char* pts_name, ScopedFd* error_sfd); |
| |
| static void* ThreadHandler(void* userdata); |
| void PassDataStreams(); |
| void WaitForExit(); |
| |
| ScopedFd* SelectLoop(fd_set* master_read_set_ptr, |
| fd_set* master_write_set_ptr); |
| |
| // Input/output stream handlers. Success returns nullptr, failure returns |
| // a pointer to the failed FD. |
| ScopedFd* PassInput(); |
| ScopedFd* PassOutput(ScopedFd* sfd, ShellProtocol::Id id); |
| |
| const std::string command_; |
| const std::string terminal_type_; |
| SubprocessType type_; |
| SubprocessProtocol protocol_; |
| pid_t pid_ = -1; |
| ScopedFd local_socket_sfd_; |
| |
| // Shell protocol variables. |
| ScopedFd stdinout_sfd_, stderr_sfd_, protocol_sfd_; |
| std::unique_ptr<ShellProtocol> input_, output_; |
| size_t input_bytes_left_ = 0; |
| |
| DISALLOW_COPY_AND_ASSIGN(Subprocess); |
| }; |
| |
| Subprocess::Subprocess(const std::string& command, const char* terminal_type, |
| SubprocessType type, SubprocessProtocol protocol) |
| : command_(command), |
| terminal_type_(terminal_type ? terminal_type : ""), |
| type_(type), |
| protocol_(protocol) { |
| } |
| |
| Subprocess::~Subprocess() { |
| WaitForExit(); |
| } |
| |
| bool Subprocess::ForkAndExec() { |
| ScopedFd child_stdinout_sfd, child_stderr_sfd; |
| ScopedFd parent_error_sfd, child_error_sfd; |
| char pts_name[PATH_MAX]; |
| |
| // Create a socketpair for the fork() child to report any errors back to the parent. Since we |
| // use threads, logging directly from the child might deadlock due to locks held in another |
| // thread during the fork. |
| if (!CreateSocketpair(&parent_error_sfd, &child_error_sfd)) { |
| LOG(ERROR) << "failed to create pipe for subprocess error reporting"; |
| } |
| |
| // Construct the environment for the child before we fork. |
| passwd* pw = getpwuid(getuid()); |
| std::unordered_map<std::string, std::string> env; |
| if (environ) { |
| char** current = environ; |
| while (char* env_cstr = *current++) { |
| std::string env_string = env_cstr; |
| char* delimiter = strchr(env_string.c_str(), '='); |
| |
| // Drop any values that don't contain '='. |
| if (delimiter) { |
| *delimiter++ = '\0'; |
| env[env_string.c_str()] = delimiter; |
| } |
| } |
| } |
| |
| if (pw != nullptr) { |
| // TODO: $HOSTNAME? Normally bash automatically sets that, but mksh doesn't. |
| env["HOME"] = pw->pw_dir; |
| env["LOGNAME"] = pw->pw_name; |
| env["USER"] = pw->pw_name; |
| env["SHELL"] = pw->pw_shell; |
| } |
| |
| if (!terminal_type_.empty()) { |
| env["TERM"] = terminal_type_; |
| } |
| |
| std::vector<std::string> joined_env; |
| for (auto it : env) { |
| const char* key = it.first.c_str(); |
| const char* value = it.second.c_str(); |
| joined_env.push_back(android::base::StringPrintf("%s=%s", key, value)); |
| } |
| |
| std::vector<const char*> cenv; |
| for (const std::string& str : joined_env) { |
| cenv.push_back(str.c_str()); |
| } |
| cenv.push_back(nullptr); |
| |
| if (type_ == SubprocessType::kPty) { |
| int fd; |
| pid_ = forkpty(&fd, pts_name, nullptr, nullptr); |
| stdinout_sfd_.Reset(fd); |
| } else { |
| if (!CreateSocketpair(&stdinout_sfd_, &child_stdinout_sfd)) { |
| return false; |
| } |
| // Raw subprocess + shell protocol allows for splitting stderr. |
| if (protocol_ == SubprocessProtocol::kShell && |
| !CreateSocketpair(&stderr_sfd_, &child_stderr_sfd)) { |
| return false; |
| } |
| pid_ = fork(); |
| } |
| |
| if (pid_ == -1) { |
| PLOG(ERROR) << "fork failed"; |
| return false; |
| } |
| |
| if (pid_ == 0) { |
| // Subprocess child. |
| init_subproc_child(); |
| |
| if (type_ == SubprocessType::kPty) { |
| child_stdinout_sfd.Reset(OpenPtyChildFd(pts_name, &child_error_sfd)); |
| } |
| |
| dup2(child_stdinout_sfd.fd(), STDIN_FILENO); |
| dup2(child_stdinout_sfd.fd(), STDOUT_FILENO); |
| dup2(child_stderr_sfd.valid() ? child_stderr_sfd.fd() : child_stdinout_sfd.fd(), |
| STDERR_FILENO); |
| |
| // exec doesn't trigger destructors, close the FDs manually. |
| stdinout_sfd_.Reset(); |
| stderr_sfd_.Reset(); |
| child_stdinout_sfd.Reset(); |
| child_stderr_sfd.Reset(); |
| parent_error_sfd.Reset(); |
| close_on_exec(child_error_sfd.fd()); |
| |
| if (command_.empty()) { |
| execle(_PATH_BSHELL, _PATH_BSHELL, "-", nullptr, cenv.data()); |
| } else { |
| execle(_PATH_BSHELL, _PATH_BSHELL, "-c", command_.c_str(), nullptr, cenv.data()); |
| } |
| WriteFdExactly(child_error_sfd.fd(), "exec '" _PATH_BSHELL "' failed"); |
| child_error_sfd.Reset(); |
| _Exit(1); |
| } |
| |
| // Subprocess parent. |
| D("subprocess parent: stdin/stdout FD = %d, stderr FD = %d", |
| stdinout_sfd_.fd(), stderr_sfd_.fd()); |
| |
| // Wait to make sure the subprocess exec'd without error. |
| child_error_sfd.Reset(); |
| std::string error_message = ReadAll(parent_error_sfd.fd()); |
| if (!error_message.empty()) { |
| LOG(ERROR) << error_message; |
| return false; |
| } |
| |
| D("subprocess parent: exec completed"); |
| if (protocol_ == SubprocessProtocol::kNone) { |
| // No protocol: all streams pass through the stdinout FD and hook |
| // directly into the local socket for raw data transfer. |
| local_socket_sfd_.Reset(stdinout_sfd_.Release()); |
| } else { |
| // Shell protocol: create another socketpair to intercept data. |
| if (!CreateSocketpair(&protocol_sfd_, &local_socket_sfd_)) { |
| return false; |
| } |
| D("protocol FD = %d", protocol_sfd_.fd()); |
| |
| input_.reset(new ShellProtocol(protocol_sfd_.fd())); |
| output_.reset(new ShellProtocol(protocol_sfd_.fd())); |
| if (!input_ || !output_) { |
| LOG(ERROR) << "failed to allocate shell protocol objects"; |
| return false; |
| } |
| |
| // Don't let reads/writes to the subprocess block our thread. This isn't |
| // likely but could happen under unusual circumstances, such as if we |
| // write a ton of data to stdin but the subprocess never reads it and |
| // the pipe fills up. |
| for (int fd : {stdinout_sfd_.fd(), stderr_sfd_.fd()}) { |
| if (fd >= 0) { |
| if (!set_file_block_mode(fd, false)) { |
| LOG(ERROR) << "failed to set non-blocking mode for fd " << fd; |
| return false; |
| } |
| } |
| } |
| } |
| |
| if (!adb_thread_create(ThreadHandler, this)) { |
| PLOG(ERROR) << "failed to create subprocess thread"; |
| return false; |
| } |
| |
| D("subprocess parent: completed"); |
| return true; |
| } |
| |
| int Subprocess::OpenPtyChildFd(const char* pts_name, ScopedFd* error_sfd) { |
| int child_fd = adb_open(pts_name, O_RDWR | O_CLOEXEC); |
| if (child_fd == -1) { |
| // Don't use WriteFdFmt; since we're in the fork() child we don't want |
| // to allocate any heap memory to avoid race conditions. |
| const char* messages[] = {"child failed to open pseudo-term slave ", |
| pts_name, ": ", strerror(errno)}; |
| for (const char* message : messages) { |
| WriteFdExactly(error_sfd->fd(), message); |
| } |
| exit(-1); |
| } |
| |
| return child_fd; |
| } |
| |
| void* Subprocess::ThreadHandler(void* userdata) { |
| Subprocess* subprocess = reinterpret_cast<Subprocess*>(userdata); |
| |
| adb_thread_setname(android::base::StringPrintf( |
| "shell srvc %d", subprocess->local_socket_fd())); |
| |
| subprocess->PassDataStreams(); |
| |
| D("deleting Subprocess for PID %d", subprocess->pid()); |
| delete subprocess; |
| |
| return nullptr; |
| } |
| |
| void Subprocess::PassDataStreams() { |
| if (!protocol_sfd_.valid()) { |
| return; |
| } |
| |
| // Start by trying to read from the protocol FD, stdout, and stderr. |
| fd_set master_read_set, master_write_set; |
| FD_ZERO(&master_read_set); |
| FD_ZERO(&master_write_set); |
| for (ScopedFd* sfd : {&protocol_sfd_, &stdinout_sfd_, &stderr_sfd_}) { |
| if (sfd->valid()) { |
| FD_SET(sfd->fd(), &master_read_set); |
| } |
| } |
| |
| // Pass data until the protocol FD or both the subprocess pipes die, at |
| // which point we can't pass any more data. |
| while (protocol_sfd_.valid() && |
| (stdinout_sfd_.valid() || stderr_sfd_.valid())) { |
| ScopedFd* dead_sfd = SelectLoop(&master_read_set, &master_write_set); |
| if (dead_sfd) { |
| D("closing FD %d", dead_sfd->fd()); |
| FD_CLR(dead_sfd->fd(), &master_read_set); |
| FD_CLR(dead_sfd->fd(), &master_write_set); |
| if (dead_sfd == &protocol_sfd_) { |
| // Using SIGHUP is a decent general way to indicate that the |
| // controlling process is going away. If specific signals are |
| // needed (e.g. SIGINT), pass those through the shell protocol |
| // and only fall back on this for unexpected closures. |
| D("protocol FD died, sending SIGHUP to pid %d", pid_); |
| kill(pid_, SIGHUP); |
| } |
| dead_sfd->Reset(); |
| } |
| } |
| } |
| |
| namespace { |
| |
| inline bool ValidAndInSet(const ScopedFd& sfd, fd_set* set) { |
| return sfd.valid() && FD_ISSET(sfd.fd(), set); |
| } |
| |
| } // namespace |
| |
| ScopedFd* Subprocess::SelectLoop(fd_set* master_read_set_ptr, |
| fd_set* master_write_set_ptr) { |
| fd_set read_set, write_set; |
| int select_n = std::max(std::max(protocol_sfd_.fd(), stdinout_sfd_.fd()), |
| stderr_sfd_.fd()) + 1; |
| ScopedFd* dead_sfd = nullptr; |
| |
| // Keep calling select() and passing data until an FD closes/errors. |
| while (!dead_sfd) { |
| memcpy(&read_set, master_read_set_ptr, sizeof(read_set)); |
| memcpy(&write_set, master_write_set_ptr, sizeof(write_set)); |
| if (select(select_n, &read_set, &write_set, nullptr, nullptr) < 0) { |
| if (errno == EINTR) { |
| continue; |
| } else { |
| PLOG(ERROR) << "select failed, closing subprocess pipes"; |
| stdinout_sfd_.Reset(); |
| stderr_sfd_.Reset(); |
| return nullptr; |
| } |
| } |
| |
| // Read stdout, write to protocol FD. |
| if (ValidAndInSet(stdinout_sfd_, &read_set)) { |
| dead_sfd = PassOutput(&stdinout_sfd_, ShellProtocol::kIdStdout); |
| } |
| |
| // Read stderr, write to protocol FD. |
| if (!dead_sfd && ValidAndInSet(stderr_sfd_, &read_set)) { |
| dead_sfd = PassOutput(&stderr_sfd_, ShellProtocol::kIdStderr); |
| } |
| |
| // Read protocol FD, write to stdin. |
| if (!dead_sfd && ValidAndInSet(protocol_sfd_, &read_set)) { |
| dead_sfd = PassInput(); |
| // If we didn't finish writing, block on stdin write. |
| if (input_bytes_left_) { |
| FD_CLR(protocol_sfd_.fd(), master_read_set_ptr); |
| FD_SET(stdinout_sfd_.fd(), master_write_set_ptr); |
| } |
| } |
| |
| // Continue writing to stdin; only happens if a previous write blocked. |
| if (!dead_sfd && ValidAndInSet(stdinout_sfd_, &write_set)) { |
| dead_sfd = PassInput(); |
| // If we finished writing, go back to blocking on protocol read. |
| if (!input_bytes_left_) { |
| FD_SET(protocol_sfd_.fd(), master_read_set_ptr); |
| FD_CLR(stdinout_sfd_.fd(), master_write_set_ptr); |
| } |
| } |
| } // while (!dead_sfd) |
| |
| return dead_sfd; |
| } |
| |
| ScopedFd* Subprocess::PassInput() { |
| // Only read a new packet if we've finished writing the last one. |
| if (!input_bytes_left_) { |
| if (!input_->Read()) { |
| // Read() uses ReadFdExactly() which sets errno to 0 on EOF. |
| if (errno != 0) { |
| PLOG(ERROR) << "error reading protocol FD " |
| << protocol_sfd_.fd(); |
| } |
| return &protocol_sfd_; |
| } |
| |
| if (stdinout_sfd_.valid()) { |
| switch (input_->id()) { |
| case ShellProtocol::kIdWindowSizeChange: |
| int rows, cols, x_pixels, y_pixels; |
| if (sscanf(input_->data(), "%dx%d,%dx%d", |
| &rows, &cols, &x_pixels, &y_pixels) == 4) { |
| winsize ws; |
| ws.ws_row = rows; |
| ws.ws_col = cols; |
| ws.ws_xpixel = x_pixels; |
| ws.ws_ypixel = y_pixels; |
| ioctl(stdinout_sfd_.fd(), TIOCSWINSZ, &ws); |
| } |
| break; |
| case ShellProtocol::kIdStdin: |
| input_bytes_left_ = input_->data_length(); |
| break; |
| case ShellProtocol::kIdCloseStdin: |
| if (type_ == SubprocessType::kRaw) { |
| if (adb_shutdown(stdinout_sfd_.fd(), SHUT_WR) == 0) { |
| return nullptr; |
| } |
| PLOG(ERROR) << "failed to shutdown writes to FD " |
| << stdinout_sfd_.fd(); |
| return &stdinout_sfd_; |
| } else { |
| // PTYs can't close just input, so rather than close the |
| // FD and risk losing subprocess output, leave it open. |
| // This only happens if the client starts a PTY shell |
| // non-interactively which is rare and unsupported. |
| // If necessary, the client can manually close the shell |
| // with `exit` or by killing the adb client process. |
| D("can't close input for PTY FD %d", stdinout_sfd_.fd()); |
| } |
| break; |
| } |
| } |
| } |
| |
| if (input_bytes_left_ > 0) { |
| int index = input_->data_length() - input_bytes_left_; |
| int bytes = adb_write(stdinout_sfd_.fd(), input_->data() + index, |
| input_bytes_left_); |
| if (bytes == 0 || (bytes < 0 && errno != EAGAIN)) { |
| if (bytes < 0) { |
| PLOG(ERROR) << "error reading stdin FD " << stdinout_sfd_.fd(); |
| } |
| // stdin is done, mark this packet as finished and we'll just start |
| // dumping any further data received from the protocol FD. |
| input_bytes_left_ = 0; |
| return &stdinout_sfd_; |
| } else if (bytes > 0) { |
| input_bytes_left_ -= bytes; |
| } |
| } |
| |
| return nullptr; |
| } |
| |
| ScopedFd* Subprocess::PassOutput(ScopedFd* sfd, ShellProtocol::Id id) { |
| int bytes = adb_read(sfd->fd(), output_->data(), output_->data_capacity()); |
| if (bytes == 0 || (bytes < 0 && errno != EAGAIN)) { |
| // read() returns EIO if a PTY closes; don't report this as an error, |
| // it just means the subprocess completed. |
| if (bytes < 0 && !(type_ == SubprocessType::kPty && errno == EIO)) { |
| PLOG(ERROR) << "error reading output FD " << sfd->fd(); |
| } |
| return sfd; |
| } |
| |
| if (bytes > 0 && !output_->Write(id, bytes)) { |
| if (errno != 0) { |
| PLOG(ERROR) << "error reading protocol FD " << protocol_sfd_.fd(); |
| } |
| return &protocol_sfd_; |
| } |
| |
| return nullptr; |
| } |
| |
| void Subprocess::WaitForExit() { |
| int exit_code = 1; |
| |
| D("waiting for pid %d", pid_); |
| while (true) { |
| int status; |
| if (pid_ == waitpid(pid_, &status, 0)) { |
| D("post waitpid (pid=%d) status=%04x", pid_, status); |
| if (WIFSIGNALED(status)) { |
| exit_code = 0x80 | WTERMSIG(status); |
| D("subprocess killed by signal %d", WTERMSIG(status)); |
| break; |
| } else if (!WIFEXITED(status)) { |
| D("subprocess didn't exit"); |
| break; |
| } else if (WEXITSTATUS(status) >= 0) { |
| exit_code = WEXITSTATUS(status); |
| D("subprocess exit code = %d", WEXITSTATUS(status)); |
| break; |
| } |
| } |
| } |
| |
| // If we have an open protocol FD send an exit packet. |
| if (protocol_sfd_.valid()) { |
| output_->data()[0] = exit_code; |
| if (output_->Write(ShellProtocol::kIdExit, 1)) { |
| D("wrote the exit code packet: %d", exit_code); |
| } else { |
| PLOG(ERROR) << "failed to write the exit code packet"; |
| } |
| protocol_sfd_.Reset(); |
| } |
| |
| // Pass the local socket FD to the shell cleanup fdevent. |
| if (SHELL_EXIT_NOTIFY_FD >= 0) { |
| int fd = local_socket_sfd_.fd(); |
| if (WriteFdExactly(SHELL_EXIT_NOTIFY_FD, &fd, sizeof(fd))) { |
| D("passed fd %d to SHELL_EXIT_NOTIFY_FD (%d) for pid %d", |
| fd, SHELL_EXIT_NOTIFY_FD, pid_); |
| // The shell exit fdevent now owns the FD and will close it once |
| // the last bit of data flushes through. |
| local_socket_sfd_.Release(); |
| } else { |
| PLOG(ERROR) << "failed to write fd " << fd |
| << " to SHELL_EXIT_NOTIFY_FD (" << SHELL_EXIT_NOTIFY_FD |
| << ") for pid " << pid_; |
| } |
| } |
| } |
| |
| } // namespace |
| |
| int StartSubprocess(const char* name, const char* terminal_type, |
| SubprocessType type, SubprocessProtocol protocol) { |
| D("starting %s subprocess (protocol=%s, TERM=%s): '%s'", |
| type == SubprocessType::kRaw ? "raw" : "PTY", |
| protocol == SubprocessProtocol::kNone ? "none" : "shell", |
| terminal_type, name); |
| |
| Subprocess* subprocess = new Subprocess(name, terminal_type, type, protocol); |
| if (!subprocess) { |
| LOG(ERROR) << "failed to allocate new subprocess"; |
| return -1; |
| } |
| |
| if (!subprocess->ForkAndExec()) { |
| LOG(ERROR) << "failed to start subprocess"; |
| delete subprocess; |
| return -1; |
| } |
| |
| D("subprocess creation successful: local_socket_fd=%d, pid=%d", |
| subprocess->local_socket_fd(), subprocess->pid()); |
| return subprocess->local_socket_fd(); |
| } |