Squashed 'third_party/protobuf/' content from commit e35e248
Change-Id: I6cbe123d09fe50fdcad0e51466665daeee7433c7
git-subtree-dir: third_party/protobuf
git-subtree-split: e35e24800fb8d694bdeea5fd63dc7d1b14d68723
diff --git a/src/google/protobuf/compiler/subprocess.cc b/src/google/protobuf/compiler/subprocess.cc
new file mode 100644
index 0000000..a30ac30
--- /dev/null
+++ b/src/google/protobuf/compiler/subprocess.cc
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+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc. All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+// * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+// * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+// * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+// Author: kenton@google.com (Kenton Varda)
+
+#include <google/protobuf/compiler/subprocess.h>
+
+#include <algorithm>
+#include <iostream>
+
+#ifndef _WIN32
+#include <errno.h>
+#include <sys/select.h>
+#include <sys/wait.h>
+#include <signal.h>
+#endif
+
+#include <google/protobuf/stubs/logging.h>
+#include <google/protobuf/stubs/common.h>
+#include <google/protobuf/message.h>
+#include <google/protobuf/stubs/substitute.h>
+
+
+namespace google {
+namespace protobuf {
+namespace compiler {
+
+#ifdef _WIN32
+
+static void CloseHandleOrDie(HANDLE handle) {
+ if (!CloseHandle(handle)) {
+ GOOGLE_LOG(FATAL) << "CloseHandle: "
+ << Subprocess::Win32ErrorMessage(GetLastError());
+ }
+}
+
+Subprocess::Subprocess()
+ : process_start_error_(ERROR_SUCCESS),
+ child_handle_(NULL), child_stdin_(NULL), child_stdout_(NULL) {}
+
+Subprocess::~Subprocess() {
+ if (child_stdin_ != NULL) {
+ CloseHandleOrDie(child_stdin_);
+ }
+ if (child_stdout_ != NULL) {
+ CloseHandleOrDie(child_stdout_);
+ }
+}
+
+void Subprocess::Start(const string& program, SearchMode search_mode) {
+ // Create the pipes.
+ HANDLE stdin_pipe_read;
+ HANDLE stdin_pipe_write;
+ HANDLE stdout_pipe_read;
+ HANDLE stdout_pipe_write;
+
+ if (!CreatePipe(&stdin_pipe_read, &stdin_pipe_write, NULL, 0)) {
+ GOOGLE_LOG(FATAL) << "CreatePipe: " << Win32ErrorMessage(GetLastError());
+ }
+ if (!CreatePipe(&stdout_pipe_read, &stdout_pipe_write, NULL, 0)) {
+ GOOGLE_LOG(FATAL) << "CreatePipe: " << Win32ErrorMessage(GetLastError());
+ }
+
+ // Make child side of the pipes inheritable.
+ if (!SetHandleInformation(stdin_pipe_read,
+ HANDLE_FLAG_INHERIT, HANDLE_FLAG_INHERIT)) {
+ GOOGLE_LOG(FATAL) << "SetHandleInformation: "
+ << Win32ErrorMessage(GetLastError());
+ }
+ if (!SetHandleInformation(stdout_pipe_write,
+ HANDLE_FLAG_INHERIT, HANDLE_FLAG_INHERIT)) {
+ GOOGLE_LOG(FATAL) << "SetHandleInformation: "
+ << Win32ErrorMessage(GetLastError());
+ }
+
+ // Setup STARTUPINFO to redirect handles.
+ STARTUPINFOA startup_info;
+ ZeroMemory(&startup_info, sizeof(startup_info));
+ startup_info.cb = sizeof(startup_info);
+ startup_info.dwFlags = STARTF_USESTDHANDLES;
+ startup_info.hStdInput = stdin_pipe_read;
+ startup_info.hStdOutput = stdout_pipe_write;
+ startup_info.hStdError = GetStdHandle(STD_ERROR_HANDLE);
+
+ if (startup_info.hStdError == INVALID_HANDLE_VALUE) {
+ GOOGLE_LOG(FATAL) << "GetStdHandle: "
+ << Win32ErrorMessage(GetLastError());
+ }
+
+ // CreateProcess() mutates its second parameter. WTF?
+ char* name_copy = strdup(program.c_str());
+
+ // Create the process.
+ PROCESS_INFORMATION process_info;
+
+ if (CreateProcessA((search_mode == SEARCH_PATH) ? NULL : program.c_str(),
+ (search_mode == SEARCH_PATH) ? name_copy : NULL,
+ NULL, // process security attributes
+ NULL, // thread security attributes
+ TRUE, // inherit handles?
+ 0, // obscure creation flags
+ NULL, // environment (inherit from parent)
+ NULL, // current directory (inherit from parent)
+ &startup_info,
+ &process_info)) {
+ child_handle_ = process_info.hProcess;
+ CloseHandleOrDie(process_info.hThread);
+ child_stdin_ = stdin_pipe_write;
+ child_stdout_ = stdout_pipe_read;
+ } else {
+ process_start_error_ = GetLastError();
+ CloseHandleOrDie(stdin_pipe_write);
+ CloseHandleOrDie(stdout_pipe_read);
+ }
+
+ CloseHandleOrDie(stdin_pipe_read);
+ CloseHandleOrDie(stdout_pipe_write);
+ free(name_copy);
+}
+
+bool Subprocess::Communicate(const Message& input, Message* output,
+ string* error) {
+ if (process_start_error_ != ERROR_SUCCESS) {
+ *error = Win32ErrorMessage(process_start_error_);
+ return false;
+ }
+
+ GOOGLE_CHECK(child_handle_ != NULL) << "Must call Start() first.";
+
+ string input_data = input.SerializeAsString();
+ string output_data;
+
+ int input_pos = 0;
+
+ while (child_stdout_ != NULL) {
+ HANDLE handles[2];
+ int handle_count = 0;
+
+ if (child_stdin_ != NULL) {
+ handles[handle_count++] = child_stdin_;
+ }
+ if (child_stdout_ != NULL) {
+ handles[handle_count++] = child_stdout_;
+ }
+
+ DWORD wait_result =
+ WaitForMultipleObjects(handle_count, handles, FALSE, INFINITE);
+
+ HANDLE signaled_handle = NULL;
+ if (wait_result >= WAIT_OBJECT_0 &&
+ wait_result < WAIT_OBJECT_0 + handle_count) {
+ signaled_handle = handles[wait_result - WAIT_OBJECT_0];
+ } else if (wait_result == WAIT_FAILED) {
+ GOOGLE_LOG(FATAL) << "WaitForMultipleObjects: "
+ << Win32ErrorMessage(GetLastError());
+ } else {
+ GOOGLE_LOG(FATAL) << "WaitForMultipleObjects: Unexpected return code: "
+ << wait_result;
+ }
+
+ if (signaled_handle == child_stdin_) {
+ DWORD n;
+ if (!WriteFile(child_stdin_,
+ input_data.data() + input_pos,
+ input_data.size() - input_pos,
+ &n, NULL)) {
+ // Child closed pipe. Presumably it will report an error later.
+ // Pretend we're done for now.
+ input_pos = input_data.size();
+ } else {
+ input_pos += n;
+ }
+
+ if (input_pos == input_data.size()) {
+ // We're done writing. Close.
+ CloseHandleOrDie(child_stdin_);
+ child_stdin_ = NULL;
+ }
+ } else if (signaled_handle == child_stdout_) {
+ char buffer[4096];
+ DWORD n;
+
+ if (!ReadFile(child_stdout_, buffer, sizeof(buffer), &n, NULL)) {
+ // We're done reading. Close.
+ CloseHandleOrDie(child_stdout_);
+ child_stdout_ = NULL;
+ } else {
+ output_data.append(buffer, n);
+ }
+ }
+ }
+
+ if (child_stdin_ != NULL) {
+ // Child did not finish reading input before it closed the output.
+ // Presumably it exited with an error.
+ CloseHandleOrDie(child_stdin_);
+ child_stdin_ = NULL;
+ }
+
+ DWORD wait_result = WaitForSingleObject(child_handle_, INFINITE);
+
+ if (wait_result == WAIT_FAILED) {
+ GOOGLE_LOG(FATAL) << "WaitForSingleObject: "
+ << Win32ErrorMessage(GetLastError());
+ } else if (wait_result != WAIT_OBJECT_0) {
+ GOOGLE_LOG(FATAL) << "WaitForSingleObject: Unexpected return code: "
+ << wait_result;
+ }
+
+ DWORD exit_code;
+ if (!GetExitCodeProcess(child_handle_, &exit_code)) {
+ GOOGLE_LOG(FATAL) << "GetExitCodeProcess: "
+ << Win32ErrorMessage(GetLastError());
+ }
+
+ CloseHandleOrDie(child_handle_);
+ child_handle_ = NULL;
+
+ if (exit_code != 0) {
+ *error = strings::Substitute(
+ "Plugin failed with status code $0.", exit_code);
+ return false;
+ }
+
+ if (!output->ParseFromString(output_data)) {
+ *error = "Plugin output is unparseable: " + CEscape(output_data);
+ return false;
+ }
+
+ return true;
+}
+
+string Subprocess::Win32ErrorMessage(DWORD error_code) {
+ char* message;
+
+ // WTF?
+ FormatMessage(FORMAT_MESSAGE_ALLOCATE_BUFFER |
+ FORMAT_MESSAGE_FROM_SYSTEM |
+ FORMAT_MESSAGE_IGNORE_INSERTS,
+ NULL, error_code, 0,
+ (LPTSTR)&message, // NOT A BUG!
+ 0, NULL);
+
+ string result = message;
+ LocalFree(message);
+ return result;
+}
+
+// ===================================================================
+
+#else // _WIN32
+
+Subprocess::Subprocess()
+ : child_pid_(-1), child_stdin_(-1), child_stdout_(-1) {}
+
+Subprocess::~Subprocess() {
+ if (child_stdin_ != -1) {
+ close(child_stdin_);
+ }
+ if (child_stdout_ != -1) {
+ close(child_stdout_);
+ }
+}
+
+void Subprocess::Start(const string& program, SearchMode search_mode) {
+ // Note that we assume that there are no other threads, thus we don't have to
+ // do crazy stuff like using socket pairs or avoiding libc locks.
+
+ // [0] is read end, [1] is write end.
+ int stdin_pipe[2];
+ int stdout_pipe[2];
+
+ GOOGLE_CHECK(pipe(stdin_pipe) != -1);
+ GOOGLE_CHECK(pipe(stdout_pipe) != -1);
+
+ char* argv[2] = { strdup(program.c_str()), NULL };
+
+ child_pid_ = fork();
+ if (child_pid_ == -1) {
+ GOOGLE_LOG(FATAL) << "fork: " << strerror(errno);
+ } else if (child_pid_ == 0) {
+ // We are the child.
+ dup2(stdin_pipe[0], STDIN_FILENO);
+ dup2(stdout_pipe[1], STDOUT_FILENO);
+
+ close(stdin_pipe[0]);
+ close(stdin_pipe[1]);
+ close(stdout_pipe[0]);
+ close(stdout_pipe[1]);
+
+ switch (search_mode) {
+ case SEARCH_PATH:
+ execvp(argv[0], argv);
+ break;
+ case EXACT_NAME:
+ execv(argv[0], argv);
+ break;
+ }
+
+ // Write directly to STDERR_FILENO to avoid stdio code paths that may do
+ // stuff that is unsafe here.
+ int ignored;
+ ignored = write(STDERR_FILENO, argv[0], strlen(argv[0]));
+ const char* message = ": program not found or is not executable\n";
+ ignored = write(STDERR_FILENO, message, strlen(message));
+ (void) ignored;
+
+ // Must use _exit() rather than exit() to avoid flushing output buffers
+ // that will also be flushed by the parent.
+ _exit(1);
+ } else {
+ free(argv[0]);
+
+ close(stdin_pipe[0]);
+ close(stdout_pipe[1]);
+
+ child_stdin_ = stdin_pipe[1];
+ child_stdout_ = stdout_pipe[0];
+ }
+}
+
+bool Subprocess::Communicate(const Message& input, Message* output,
+ string* error) {
+
+ GOOGLE_CHECK_NE(child_stdin_, -1) << "Must call Start() first.";
+
+ // The "sighandler_t" typedef is GNU-specific, so define our own.
+ typedef void SignalHandler(int);
+
+ // Make sure SIGPIPE is disabled so that if the child dies it doesn't kill us.
+ SignalHandler* old_pipe_handler = signal(SIGPIPE, SIG_IGN);
+
+ string input_data = input.SerializeAsString();
+ string output_data;
+
+ int input_pos = 0;
+ int max_fd = max(child_stdin_, child_stdout_);
+
+ while (child_stdout_ != -1) {
+ fd_set read_fds;
+ fd_set write_fds;
+ FD_ZERO(&read_fds);
+ FD_ZERO(&write_fds);
+ if (child_stdout_ != -1) {
+ FD_SET(child_stdout_, &read_fds);
+ }
+ if (child_stdin_ != -1) {
+ FD_SET(child_stdin_, &write_fds);
+ }
+
+ if (select(max_fd + 1, &read_fds, &write_fds, NULL, NULL) < 0) {
+ if (errno == EINTR) {
+ // Interrupted by signal. Try again.
+ continue;
+ } else {
+ GOOGLE_LOG(FATAL) << "select: " << strerror(errno);
+ }
+ }
+
+ if (child_stdin_ != -1 && FD_ISSET(child_stdin_, &write_fds)) {
+ int n = write(child_stdin_, input_data.data() + input_pos,
+ input_data.size() - input_pos);
+ if (n < 0) {
+ // Child closed pipe. Presumably it will report an error later.
+ // Pretend we're done for now.
+ input_pos = input_data.size();
+ } else {
+ input_pos += n;
+ }
+
+ if (input_pos == input_data.size()) {
+ // We're done writing. Close.
+ close(child_stdin_);
+ child_stdin_ = -1;
+ }
+ }
+
+ if (child_stdout_ != -1 && FD_ISSET(child_stdout_, &read_fds)) {
+ char buffer[4096];
+ int n = read(child_stdout_, buffer, sizeof(buffer));
+
+ if (n > 0) {
+ output_data.append(buffer, n);
+ } else {
+ // We're done reading. Close.
+ close(child_stdout_);
+ child_stdout_ = -1;
+ }
+ }
+ }
+
+ if (child_stdin_ != -1) {
+ // Child did not finish reading input before it closed the output.
+ // Presumably it exited with an error.
+ close(child_stdin_);
+ child_stdin_ = -1;
+ }
+
+ int status;
+ while (waitpid(child_pid_, &status, 0) == -1) {
+ if (errno != EINTR) {
+ GOOGLE_LOG(FATAL) << "waitpid: " << strerror(errno);
+ }
+ }
+
+ // Restore SIGPIPE handling.
+ signal(SIGPIPE, old_pipe_handler);
+
+ if (WIFEXITED(status)) {
+ if (WEXITSTATUS(status) != 0) {
+ int error_code = WEXITSTATUS(status);
+ *error = strings::Substitute(
+ "Plugin failed with status code $0.", error_code);
+ return false;
+ }
+ } else if (WIFSIGNALED(status)) {
+ int signal = WTERMSIG(status);
+ *error = strings::Substitute(
+ "Plugin killed by signal $0.", signal);
+ return false;
+ } else {
+ *error = "Neither WEXITSTATUS nor WTERMSIG is true?";
+ return false;
+ }
+
+ if (!output->ParseFromString(output_data)) {
+ *error = "Plugin output is unparseable: " + CEscape(output_data);
+ return false;
+ }
+
+ return true;
+}
+
+#endif // !_WIN32
+
+} // namespace compiler
+} // namespace protobuf
+} // namespace google