mirror of https://github.com/Icinga/icinga2.git
364 lines
8.4 KiB
C++
364 lines
8.4 KiB
C++
/******************************************************************************
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* Icinga 2 *
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* Copyright (C) 2012 Icinga Development Team (http://www.icinga.org/) *
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* *
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* This program is free software; you can redistribute it and/or *
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* modify it under the terms of the GNU General Public License *
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* as published by the Free Software Foundation; either version 2 *
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* of the License, or (at your option) any later version. *
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* *
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* This program is distributed in the hope that it will be useful, *
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* but WITHOUT ANY WARRANTY; without even the implied warranty of *
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
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* GNU General Public License for more details. *
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* *
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* You should have received a copy of the GNU General Public License *
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* along with this program; if not, write to the Free Software Foundation *
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA. *
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******************************************************************************/
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#include "i2-base.h"
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#ifndef _WIN32
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#include <execvpe.h>
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using namespace icinga;
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condition_variable Process::m_CV;
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int Process::m_TaskFd;
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Timer::Ptr Process::m_StatusTimer;
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extern char **environ;
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void Process::Initialize(void)
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{
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int fds[2];
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#if HAVE_PIPE2
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if (pipe2(fds, O_CLOEXEC) < 0)
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BOOST_THROW_EXCEPTION(PosixException("pipe2() failed.", errno));
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#else /* HAVE_PIPE2 */
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if (pipe(fds) < 0)
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BOOST_THROW_EXCEPTION(PosixException("pipe() failed.", errno));
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/* Don't bother setting fds[0] to clo-exec as we'll only
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* use it in the following dup() call. */
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Utility::SetCloExec(fds[1]);
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#endif /* HAVE_PIPE2 */
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m_TaskFd = fds[1];
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unsigned int threads = thread::hardware_concurrency();
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if (threads == 0)
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threads = 2;
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for (unsigned int i = 0; i < threads; i++) {
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int childTaskFd = dup(fds[0]);
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if (childTaskFd < 0)
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BOOST_THROW_EXCEPTION(PosixException("dup() failed.", errno));
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Utility::SetNonBlocking(childTaskFd);
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Utility::SetCloExec(childTaskFd);
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thread t(&Process::WorkerThreadProc, childTaskFd);
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t.detach();
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}
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(void) close(fds[0]);
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m_StatusTimer = boost::make_shared<Timer>();
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m_StatusTimer->OnTimerExpired.connect(boost::bind(&Process::StatusTimerHandler));
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m_StatusTimer->SetInterval(5);
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m_StatusTimer->Start();
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}
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void Process::WorkerThreadProc(int taskFd)
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{
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map<int, Process::Ptr> tasks;
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pollfd *pfds = NULL;
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for (;;) {
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map<int, Process::Ptr>::iterator it, prev;
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pfds = (pollfd *)realloc(pfds, (1 + tasks.size()) * sizeof(pollfd));
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if (pfds == NULL)
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BOOST_THROW_EXCEPTION(PosixException("realloc() failed.", errno));
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int idx = 0;
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int fd;
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BOOST_FOREACH(tie(fd, tuples::ignore), tasks) {
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pfds[idx].fd = fd;
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pfds[idx].events = POLLIN | POLLHUP;
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idx++;
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}
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if (tasks.size() < MaxTasksPerThread) {
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pfds[idx].fd = taskFd;
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pfds[idx].events = POLLIN;
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idx++;
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}
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int rc = poll(pfds, idx, -1);
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if (rc < 0 && errno != EINTR)
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BOOST_THROW_EXCEPTION(PosixException("poll() failed.", errno));
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if (rc == 0)
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continue;
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for (int i = 0; i < idx; i++) {
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if ((pfds[i].revents & (POLLIN|POLLHUP)) == 0)
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continue;
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if (pfds[i].fd == taskFd) {
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vector<Process::Ptr> new_tasks;
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unsigned int want = MaxTasksPerThread - tasks.size();
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if (want > 0) {
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boost::mutex::scoped_lock lock(m_Mutex);
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/* Read one byte for every task we take from the pending tasks list. */
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char buffer[MaxTasksPerThread];
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ASSERT(want <= sizeof(buffer));
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int have = read(taskFd, &buffer, want);
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if (have < 0) {
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if (errno == EAGAIN)
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break; /* Someone else was faster and took our task. */
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BOOST_THROW_EXCEPTION(PosixException("read() failed.", errno));
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}
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while (have > 0) {
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ASSERT(!m_Tasks.empty());
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Process::Ptr task = m_Tasks.front();
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m_Tasks.pop_front();
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new_tasks.push_back(task);
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have--;
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}
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m_CV.notify_all();
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}
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BOOST_FOREACH(const Process::Ptr& task, new_tasks) {
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try {
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task->InitTask();
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int fd = task->m_FD;
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if (fd >= 0)
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tasks[fd] = task;
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} catch (...) {
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task->FinishException(boost::current_exception());
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}
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}
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continue;
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}
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it = tasks.find(pfds[i].fd);
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if (it == tasks.end())
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continue;
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Process::Ptr task = it->second;
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if (!task->RunTask()) {
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prev = it;
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tasks.erase(prev);
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task->FinishResult(task->m_Result);
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}
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}
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}
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}
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void Process::QueueTask(void)
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{
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{
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boost::mutex::scoped_lock lock(m_Mutex);
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while (m_Tasks.size() >= PIPE_BUF)
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m_CV.wait(lock);
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m_Tasks.push_back(GetSelf());
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/**
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* This little gem which is commonly known as the "self-pipe trick"
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* takes care of waking up the select() call in the worker thread.
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*/
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if (write(m_TaskFd, "T", 1) < 0)
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BOOST_THROW_EXCEPTION(PosixException("write() failed.", errno));
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}
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}
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void Process::InitTask(void)
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{
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m_Result.ExecutionStart = Utility::GetTime();
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ASSERT(m_FD == -1);
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int fds[2];
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#if HAVE_PIPE2
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if (pipe2(fds, O_NONBLOCK | O_CLOEXEC) < 0)
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BOOST_THROW_EXCEPTION(PosixException("pipe2() failed.", errno));
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#else /* HAVE_PIPE2 */
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if (pipe(fds) < 0)
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BOOST_THROW_EXCEPTION(PosixException("pipe() failed.", errno));
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Utility::SetNonBlocking(fds[0]);
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Utility::SetCloExec(fds[0]);
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Utility::SetNonBlocking(fds[1]);
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Utility::SetCloExec(fds[1]);
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#endif /* HAVE_PIPE2 */
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// build argv
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char **argv = new char *[m_Arguments.size() + 1];
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for (unsigned int i = 0; i < m_Arguments.size(); i++)
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argv[i] = strdup(m_Arguments[i].CStr());
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argv[m_Arguments.size()] = NULL;
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m_Arguments.clear();
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// build envp
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int envc = 0;
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/* count existing environment variables */
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while (environ[envc] != NULL)
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envc++;
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char **envp = new char *[envc + (m_ExtraEnvironment ? m_ExtraEnvironment->GetLength() : 0) + 1];
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for (int i = 0; i < envc; i++)
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envp[i] = strdup(environ[i]);
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if (m_ExtraEnvironment) {
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ObjectLock olock(m_ExtraEnvironment);
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String key;
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Value value;
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int index = envc;
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BOOST_FOREACH(tie(key, value), m_ExtraEnvironment) {
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String kv = key + "=" + Convert::ToString(value);
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envp[index] = strdup(kv.CStr());
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index++;
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}
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}
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envp[envc + (m_ExtraEnvironment ? m_ExtraEnvironment->GetLength() : 0)] = NULL;
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m_ExtraEnvironment.reset();
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#if HAVE_WORKING_VFORK
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m_Pid = vfork();
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#else /* HAVE_WORKING_VFORK */
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m_Pid = fork();
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#endif /* HAVE_WORKING_VFORK */
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if (m_Pid < 0)
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BOOST_THROW_EXCEPTION(PosixException("fork() failed.", errno));
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if (m_Pid == 0) {
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// child process
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if (dup2(fds[1], STDOUT_FILENO) < 0 || dup2(fds[1], STDERR_FILENO) < 0) {
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perror("dup2() failed.");
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_exit(128);
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}
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(void) close(fds[0]);
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(void) close(fds[1]);
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if (execvpe(argv[0], argv, envp) < 0) {
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perror("execvpe() failed.");
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_exit(128);
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}
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_exit(128);
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}
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// parent process
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// free arguments
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for (int i = 0; argv[i] != NULL; i++)
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free(argv[i]);
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delete [] argv;
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// free environment
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for (int i = 0; envp[i] != NULL; i++)
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free(envp[i]);
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delete [] envp;
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m_FD = fds[0];
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(void) close(fds[1]);
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}
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bool Process::RunTask(void)
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{
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char buffer[512];
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int rc;
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do {
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rc = read(m_FD, buffer, sizeof(buffer));
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if (rc > 0) {
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m_OutputStream.write(buffer, rc);
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}
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} while (rc > 0);
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if (rc < 0 && errno == EAGAIN)
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return true;
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String output = m_OutputStream.str();
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int status, exitcode;
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(void) close(m_FD);
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if (waitpid(m_Pid, &status, 0) != m_Pid)
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BOOST_THROW_EXCEPTION(PosixException("waitpid() failed.", errno));
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if (WIFEXITED(status)) {
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exitcode = WEXITSTATUS(status);
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} else if (WIFSIGNALED(status)) {
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stringstream outputbuf;
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outputbuf << "Process was terminated by signal " << WTERMSIG(status);
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output = outputbuf.str();
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exitcode = 128;
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} else {
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exitcode = 128;
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}
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m_Result.ExecutionEnd = Utility::GetTime();
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m_Result.ExitStatus = exitcode;
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m_Result.Output = output;
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return false;
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}
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void Process::StatusTimerHandler(void)
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{
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boost::mutex::scoped_lock lock(m_Mutex);
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if (m_Tasks.size() > 50)
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Logger::Write(LogCritical, "base", "More than 50 waiting Process tasks: " +
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Convert::ToString(m_Tasks.size()));
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}
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#endif /* _WIN32 */
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