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// Copyright 2011 Google Inc. All Rights Reserved.
//
// 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.
#include "subprocess.h"
#include <stdio.h>
#include <algorithm>
#include "util.h"
namespace {
void Win32Fatal(const char* function) {
Fatal("%s: %s", function, GetLastErrorString().c_str());
}
} // anonymous namespace
Subprocess::Subprocess() : child_(NULL) , overlapped_() {
}
Subprocess::~Subprocess() {
// Reap child if forgotten.
if (child_)
Finish();
}
HANDLE Subprocess::SetupPipe(HANDLE ioport) {
char pipe_name[100];
snprintf(pipe_name, sizeof(pipe_name),
"\\\\.\\pipe\\ninja_pid%u_sp%p", GetCurrentProcessId(), this);
pipe_ = ::CreateNamedPipeA(pipe_name,
PIPE_ACCESS_INBOUND | FILE_FLAG_OVERLAPPED,
PIPE_TYPE_BYTE,
PIPE_UNLIMITED_INSTANCES,
0, 0, INFINITE, NULL);
if (pipe_ == INVALID_HANDLE_VALUE)
Win32Fatal("CreateNamedPipe");
if (!CreateIoCompletionPort(pipe_, ioport, (ULONG_PTR)this, 0))
Win32Fatal("CreateIoCompletionPort");
memset(&overlapped_, 0, sizeof(overlapped_));
if (!ConnectNamedPipe(pipe_, &overlapped_) &&
GetLastError() != ERROR_IO_PENDING) {
Win32Fatal("ConnectNamedPipe");
}
// Get the write end of the pipe as a handle inheritable across processes.
HANDLE output_write_handle = CreateFile(pipe_name, GENERIC_WRITE, 0,
NULL, OPEN_EXISTING, 0, NULL);
HANDLE output_write_child;
if (!DuplicateHandle(GetCurrentProcess(), output_write_handle,
GetCurrentProcess(), &output_write_child,
0, TRUE, DUPLICATE_SAME_ACCESS)) {
Win32Fatal("DuplicateHandle");
}
CloseHandle(output_write_handle);
return output_write_child;
}
bool Subprocess::Start(SubprocessSet* set, const string& command) {
HANDLE child_pipe = SetupPipe(set->ioport_);
STARTUPINFOA startup_info;
memset(&startup_info, 0, sizeof(startup_info));
startup_info.cb = sizeof(STARTUPINFO);
startup_info.dwFlags = STARTF_USESTDHANDLES;
startup_info.hStdOutput = child_pipe;
// TODO: what does this hook up stdin to?
startup_info.hStdInput = NULL;
// TODO: is it ok to reuse pipe like this?
startup_info.hStdError = child_pipe;
PROCESS_INFORMATION process_info;
memset(&process_info, 0, sizeof(process_info));
// Do not prepend 'cmd /c' on Windows, this breaks command
// lines greater than 8,191 chars.
if (!CreateProcessA(NULL, (char*)command.c_str(), NULL, NULL,
/* inherit handles */ TRUE, 0,
NULL, NULL,
&startup_info, &process_info)) {
DWORD error = GetLastError();
if (error == ERROR_FILE_NOT_FOUND) { // file (program) not found error is treated as a normal build action failure
if (child_pipe)
CloseHandle(child_pipe);
CloseHandle(pipe_);
pipe_ = NULL;
// child_ is already NULL;
buf_ = "CreateProcess failed: The system cannot find the file specified.\n";
return true;
} else {
Win32Fatal("CreateProcess"); // pass all other errors to Win32Fatal
}
}
// Close pipe channel only used by the child.
if (child_pipe)
CloseHandle(child_pipe);
CloseHandle(process_info.hThread);
child_ = process_info.hProcess;
return true;
}
void Subprocess::OnPipeReady() {
DWORD bytes;
if (!GetOverlappedResult(pipe_, &overlapped_, &bytes, TRUE)) {
if (GetLastError() == ERROR_BROKEN_PIPE) {
CloseHandle(pipe_);
pipe_ = NULL;
return;
}
Win32Fatal("GetOverlappedResult");
}
if (bytes)
buf_.append(overlapped_buf_, bytes);
memset(&overlapped_, 0, sizeof(overlapped_));
if (!::ReadFile(pipe_, overlapped_buf_, sizeof(overlapped_buf_),
&bytes, &overlapped_)) {
if (GetLastError() == ERROR_BROKEN_PIPE) {
CloseHandle(pipe_);
pipe_ = NULL;
return;
}
if (GetLastError() != ERROR_IO_PENDING)
Win32Fatal("ReadFile");
}
// Even if we read any bytes in the readfile call, we'll enter this
// function again later and get them at that point.
}
bool Subprocess::Finish() {
if (! child_) {
return false;
}
// TODO: add error handling for all of these.
WaitForSingleObject(child_, INFINITE);
DWORD exit_code = 0;
GetExitCodeProcess(child_, &exit_code);
CloseHandle(child_);
child_ = NULL;
return exit_code == 0;
}
bool Subprocess::Done() const {
return pipe_ == NULL;
}
const string& Subprocess::GetOutput() const {
return buf_;
}
SubprocessSet::SubprocessSet() {
ioport_ = ::CreateIoCompletionPort(INVALID_HANDLE_VALUE, NULL, 0, 1);
if (!ioport_)
Win32Fatal("CreateIoCompletionPort");
}
SubprocessSet::~SubprocessSet() {
CloseHandle(ioport_);
}
void SubprocessSet::Add(Subprocess* subprocess) {
if (subprocess->child_)
running_.push_back(subprocess);
else
finished_.push(subprocess);
}
void SubprocessSet::DoWork() {
DWORD bytes_read;
Subprocess* subproc;
OVERLAPPED* overlapped;
if (!GetQueuedCompletionStatus(ioport_, &bytes_read, (PULONG_PTR)&subproc,
&overlapped, INFINITE)) {
if (GetLastError() != ERROR_BROKEN_PIPE)
Win32Fatal("GetQueuedCompletionStatus");
}
subproc->OnPipeReady();
if (subproc->Done()) {
vector<Subprocess*>::iterator end =
std::remove(running_.begin(), running_.end(), subproc);
if (running_.end() != end) {
finished_.push(subproc);
running_.resize(end - running_.begin());
}
}
}
Subprocess* SubprocessSet::NextFinished() {
if (finished_.empty())
return NULL;
Subprocess* subproc = finished_.front();
finished_.pop();
return subproc;
}
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