1 files changed, 383 insertions, 0 deletions
diff --git a/src/platforms/posix/posixChildProcess.cpp b/src/platforms/posix/posixChildProcess.cpp
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+++ b/src/platforms/posix/posixChildProcess.cpp
@@ -0,0 +1,383 @@
+//
+// VMime library (http://www.vmime.org)
+// Copyright (C) 2002-2005 Vincent Richard <[email protected]>
+//
+// This program is free software; you can redistribute it and/or
+// modify it under the terms of the GNU General Public License as
+// published by the Free Software Foundation; either version 2 of
+// the License, or (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+// General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program; if not, write to the Free Software
+// Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+//
+
+#include "vmime/platforms/posix/posixChildProcess.hpp"
+#include "vmime/platforms/posix/posixFile.hpp"
+
+#include "vmime/exception.hpp"
+
+#include "vmime/utility/smartPtr.hpp"
+
+#include <unistd.h>
+#include <string.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <signal.h>
+#include <sys/wait.h>
+
+
+namespace vmime {
+namespace platforms {
+namespace posix {
+
+
+// posixChildProcessFactory
+
+utility::childProcess* posixChildProcessFactory::create(const utility::file::path& path) const
+{
+	return new posixChildProcess(path);
+}
+
+
+
+#ifndef VMIME_BUILDING_DOC
+
+
+// getPosixSignalMessage
+// Returns the name of a POSIX signal.
+
+static const string getPosixSignalMessage(const int num)
+{
+	switch (num)
+	{
+	case SIGHUP:  return "SIGHUP";
+	case SIGINT:  return "SIGINT";
+	case SIGQUIT: return "SIGQUIT";
+	case SIGILL:  return "SIGILL";
+	case SIGABRT: return "SIGABRT";
+	case SIGFPE:  return "SIGFPE";
+	case SIGKILL: return "SIGKILL";
+	case SIGSEGV: return "SIGSEGV";
+	case SIGPIPE: return "SIGPIPE";
+	case SIGALRM: return "SIGALRM";
+	case SIGTERM: return "SIGTERM";
+	case SIGUSR1: return "SIGUSR1";
+	case SIGUSR2: return "SIGUSR2";
+	case SIGCHLD: return "SIGCHLD";
+	case SIGCONT: return "SIGCONT";
+	case SIGSTOP: return "SIGSTOP";
+	case SIGTSTP: return "SIGTSTP";
+	case SIGTTIN: return "SIGTTIN";
+	case SIGTTOU: return "SIGTTOU";
+	}
+
+	return "(unknown)";
+}
+
+
+// getPosixErrorMessage
+// Returns a message corresponding to an error code.
+
+static const string getPosixErrorMessage(const int num)
+{
+#ifdef strerror_r
+	char res[256];
+	res[0] = '\0';
+
+	strerror_r(num, res, sizeof(res));
+
+	return string(res);
+#else
+	return string(strerror(num));
+#endif
+}
+
+
+// Output stream adapter for POSIX pipe
+
+class outputStreamPosixPipeAdapter : public utility::outputStream
+{
+public:
+
+	outputStreamPosixPipeAdapter(const int desc)
+		: m_desc(desc)
+	{
+	}
+
+	void write(const value_type* const data, const size_type count)
+	{
+		if (::write(m_desc, data, count) == -1)
+		{
+			const string errorMsg = getPosixErrorMessage(errno);
+			throw exceptions::system_error(errorMsg);
+		}
+	}
+
+private:
+
+	const int m_desc;
+};
+
+
+// Input stream adapter for POSIX pipe
+
+class inputStreamPosixPipeAdapter : public utility::inputStream
+{
+public:
+
+	inputStreamPosixPipeAdapter(const int desc)
+		: m_desc(desc)
+	{
+	}
+
+	const bool eof() const
+	{
+		return (m_eof);
+	}
+
+	void reset()
+	{
+		// Do nothing: unsupported
+	}
+
+	const size_type skip(const size_type count)
+	{
+		// TODO: not tested
+		value_type buffer[4096];
+
+		int bytesSkipped = 0;
+		int bytesRead = 0;
+
+		while ((bytesRead = ::read(m_desc, buffer,
+			std::min(sizeof(buffer), count - bytesSkipped))) != 0)
+		{
+			if (bytesRead == -1)
+			{
+				const string errorMsg = getPosixErrorMessage(errno);
+				throw exceptions::system_error(errorMsg);
+			}
+
+			bytesSkipped += bytesRead;
+		}
+
+		return static_cast <size_type>(bytesSkipped);
+	}
+
+	const size_type read(value_type* const data, const size_type count)
+	{
+		int bytesRead = 0;
+
+		if ((bytesRead = ::read(m_desc, data, count)) == -1)
+		{
+			const string errorMsg = getPosixErrorMessage(errno);
+			throw exceptions::system_error(errorMsg);
+		}
+
+		m_eof = (bytesRead == 0);
+
+		return static_cast <size_type>(bytesRead);
+	}
+
+private:
+
+	const int m_desc;
+
+	bool m_eof;
+};
+
+
+#endif // VMIME_BUILDING_DOC
+
+
+
+// posixChildProcess
+
+posixChildProcess::posixChildProcess(const utility::file::path& path)
+	: m_processPath(path), m_started(false),
+	  m_stdIn(NULL), m_stdOut(NULL), m_pid(0)
+{
+	m_pipe[0] = 0;
+	m_pipe[1] = 0;
+
+	sigemptyset(&m_oldProcMask);
+}
+
+
+posixChildProcess::~posixChildProcess()
+{
+	if (m_started)
+		sigprocmask(SIG_SETMASK, &m_oldProcMask, NULL);
+
+	if (m_pipe[0] != 0)
+		close(m_pipe[0]);
+
+	if (m_pipe[1] != 0)
+		close(m_pipe[1]);
+
+	delete (m_stdIn);
+	delete (m_stdOut);
+}
+
+
+// The following code is highly inspired and adapted from the 'sendmail'
+// provider module in Evolution data server code.
+//
+// Original authors: Dan Winship <[email protected]>
+// Copyright 2000 Ximian, Inc. (www.ximian.com)
+
+void posixChildProcess::start(const std::vector <string> args, const int flags)
+{
+	if (m_started)
+		return;
+
+	// Construct C-style argument array
+	const char** argv = new const char*[args.size() + 2];
+
+	argv[0] = m_processPath.getLastComponent().getBuffer().c_str();
+	argv[args.size()] = NULL;
+
+	for (unsigned int i = 0 ; i < args.size() ; ++i)
+		argv[i + 1] = args[i].c_str();
+
+	// Create a pipe to communicate with the child process
+	int fd[2];
+
+	if (pipe(fd) == -1)
+	{
+		throw exceptions::system_error(getPosixErrorMessage(errno));
+	}
+
+	m_pipe[0] = fd[0];
+	m_pipe[1] = fd[1];
+
+	// Block SIGCHLD so the calling application doesn't notice
+	// process exiting before we do
+	sigset_t mask;
+
+	sigemptyset(&mask);
+	sigaddset(&mask, SIGCHLD);
+	sigprocmask(SIG_BLOCK, &mask, &m_oldProcMask);
+
+	// Spawn process
+	const pid_t pid = fork();
+
+	if (pid == -1)  // error
+	{
+		const string errorMsg = getPosixErrorMessage(errno);
+
+		sigprocmask(SIG_SETMASK, &m_oldProcMask, NULL);
+
+		close(fd[0]);
+		close(fd[1]);
+
+		throw exceptions::system_error(errorMsg);
+	}
+	else if (pid == 0)  // child process
+	{
+		if (flags & FLAG_REDIRECT_STDIN)
+			dup2(fd[0], STDIN_FILENO);
+		else
+			close(fd[0]);
+
+		if (flags & FLAG_REDIRECT_STDOUT)
+			dup2(fd[1], STDOUT_FILENO);
+		else
+			close(fd[1]);
+
+		posixFileSystemFactory* pfsf = new posixFileSystemFactory();
+
+		const string path = pfsf->pathToString(m_processPath);
+
+		delete (pfsf);
+
+		execv(path.c_str(), const_cast <char**>(argv));
+		_exit(255);
+	}
+
+	if (flags & FLAG_REDIRECT_STDIN)
+	{
+		m_stdIn = new outputStreamPosixPipeAdapter(m_pipe[1]);
+	}
+	else
+	{
+		close(m_pipe[1]);
+		m_pipe[1] = 0;
+	}
+
+	if (flags & FLAG_REDIRECT_STDOUT)
+	{
+		m_stdOut = new inputStreamPosixPipeAdapter(m_pipe[0]);
+	}
+	else
+	{
+		close(m_pipe[0]);
+		m_pipe[0] = 0;
+	}
+
+	m_pid = pid;
+	m_started = true;
+}
+
+
+utility::outputStream* posixChildProcess::getStdIn()
+{
+	return (m_stdIn);
+}
+
+
+utility::inputStream* posixChildProcess::getStdOut()
+{
+	return (m_stdOut);
+}
+
+
+void posixChildProcess::waitForFinish()
+{
+	// Close stdin pipe
+	if (m_pipe[1] != 0)
+	{
+		close(m_pipe[1]);
+		m_pipe[1] = 0;
+	}
+
+	int wstat;
+
+	while (waitpid(m_pid, &wstat, 0) == -1 && errno == EINTR)
+		;
+
+	if (!WIFEXITED(wstat))
+	{
+		throw exceptions::system_error("Process exited with signal "
+			+ getPosixSignalMessage(WTERMSIG(wstat)));
+	}
+	else if (WEXITSTATUS(wstat) != 0)
+	{
+		if (WEXITSTATUS(wstat) == 255)
+		{
+			vmime::utility::auto_ptr <posixFileSystemFactory> pfsf
+				= new posixFileSystemFactory();
+
+			throw exceptions::system_error("Could not execute '"
+				+ pfsf->pathToString(m_processPath) + "'");
+		}
+		else
+		{
+			std::ostringstream oss;
+			oss << "Process exited with status " << WEXITSTATUS(wstat);
+
+			throw exceptions::system_error(oss.str());
+		}
+	}
+}
+
+
+} // posix
+} // platforms
+} // vmime
+