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//===-- MICmnStreamStdinLinux.cpp --------------------------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//++
// File: MIUtilStreamStdin.cpp
//
// Overview: CMICmnStreamStdinLinux implementation.
//
// Environment: Compilers: Visual C++ 12.
// gcc (Ubuntu/Linaro 4.8.1-10ubuntu9) 4.8.1
// Libraries: See MIReadmetxt.
//
// Copyright: None.
//--
// Third Party Headers:
#if defined(__APPLE__)
#include <sys/select.h>
#include <unistd.h> // For STDIN_FILENO
#endif // defined( __APPLE__ )
#include <string.h> // For std::strerror()
// In-house headers:
#include "MICmnStreamStdinLinux.h"
#include "MICmnLog.h"
#include "MICmnResources.h"
#include "MIUtilSingletonHelper.h"
//++ ------------------------------------------------------------------------------------
// Details: CMICmnStreamStdinLinux constructor.
// Type: Method.
// Args: None.
// Return: None.
// Throws: None.
//--
CMICmnStreamStdinLinux::CMICmnStreamStdinLinux(void)
: m_constBufferSize(1024)
, m_pStdin(nullptr)
, m_pCmdBuffer(nullptr)
{
}
//++ ------------------------------------------------------------------------------------
// Details: CMICmnStreamStdinLinux destructor.
// Type: Overridable.
// Args: None.
// Return: None.
// Throws: None.
//--
CMICmnStreamStdinLinux::~CMICmnStreamStdinLinux(void)
{
Shutdown();
}
//++ ------------------------------------------------------------------------------------
// Details: Initialize resources for *this Stdin stream.
// Type: Method.
// Args: None.
// Return: MIstatus::success - Functional succeeded.
// MIstatus::failure - Functional failed.
// Throws: None.
//--
bool
CMICmnStreamStdinLinux::Initialize(void)
{
if (m_bInitialized)
return MIstatus::success;
bool bOk = MIstatus::success;
CMIUtilString errMsg;
// Note initialisation order is important here as some resources depend on previous
MI::ModuleInit<CMICmnLog>(IDS_MI_INIT_ERR_LOG, bOk, errMsg);
MI::ModuleInit<CMICmnResources>(IDS_MI_INIT_ERR_RESOURCES, bOk, errMsg);
// Other resources required
if (bOk)
{
m_pCmdBuffer = new MIchar[m_constBufferSize];
m_pStdin = stdin;
}
// Clear error indicators for std input
::clearerr(stdin);
m_bInitialized = bOk;
if (!bOk)
{
CMIUtilString strInitError(CMIUtilString::Format(MIRSRC(IDS_MI_INIT_ERR_OS_STDIN_HANDLER), errMsg.c_str()));
SetErrorDescription(strInitError);
return MIstatus::failure;
}
return MIstatus::success;
}
//++ ------------------------------------------------------------------------------------
// Details: Release resources for *this Stdin stream.
// Type: Method.
// Args: None.
// Return: MIstatus::success - Functional succeeded.
// MIstatus::failure - Functional failed.
// Throws: None.
//--
bool
CMICmnStreamStdinLinux::Shutdown(void)
{
if (!m_bInitialized)
return MIstatus::success;
m_bInitialized = false;
ClrErrorDescription();
bool bOk = MIstatus::success;
CMIUtilString errMsg;
// Tidy up
if (m_pCmdBuffer != nullptr)
{
delete[] m_pCmdBuffer;
m_pCmdBuffer = nullptr;
}
m_pStdin = nullptr;
// Note shutdown order is important here
MI::ModuleShutdown<CMICmnResources>(IDS_MI_INIT_ERR_RESOURCES, bOk, errMsg);
MI::ModuleShutdown<CMICmnLog>(IDS_MI_INIT_ERR_LOG, bOk, errMsg);
if (!bOk)
{
SetErrorDescriptionn(MIRSRC(IDS_MI_SHTDWN_ERR_OS_STDIN_HANDLER), errMsg.c_str());
}
return MIstatus::success;
}
//++ ------------------------------------------------------------------------------------
// Details: Determine if stdin has any characters present in its buffer.
// Type: Method.
// Args: vwbAvail - (W) True = There is chars available, false = nothing there.
// Return: MIstatus::success - Functional succeeded.
// MIstatus::failure - Functional failed.
// Throws: None.
//--
bool
CMICmnStreamStdinLinux::InputAvailable(bool &vwbAvail)
{
#if defined(__APPLE__)
// The code below is needed on OSX where lldb-mi hangs when doing -exec-run.
// The hang seems to come from calling fgets and fileno from different thread.
// Although this problem was not observed on Linux.
// A solution based on 'ioctl' was initially committed but it seems to make
// lldb-mi takes much more processor time. The solution based on 'select' works
// well but it seems to slow the execution of lldb-mi tests a lot on Linux.
// As a result, this code is #defined to run only on OSX.
fd_set setOfStdin;
FD_ZERO(&setOfStdin);
FD_SET(STDIN_FILENO, &setOfStdin);
// Wait while input would be available
if (::select(STDIN_FILENO + 1, &setOfStdin, nullptr, nullptr, nullptr) == -1)
{
vwbAvail = false;
return MIstatus::failure;
}
#endif // defined( __APPLE__ )
vwbAvail = true;
return MIstatus::success;
}
//++ ------------------------------------------------------------------------------------
// Details: Wait on new line of data from stdin stream (completed by '\n' or '\r').
// Type: Method.
// Args: vwErrMsg - (W) Empty string ok or error description.
// Return: MIchar * - text buffer pointer or NULL on failure.
// Throws: None.
//--
const MIchar *
CMICmnStreamStdinLinux::ReadLine(CMIUtilString &vwErrMsg)
{
vwErrMsg.clear();
// Read user input
const MIchar *pText = ::fgets(&m_pCmdBuffer[0], m_constBufferSize, stdin);
if (pText == nullptr)
{
if (::ferror(m_pStdin) != 0)
vwErrMsg = ::strerror(errno);
return nullptr;
}
// Strip off new line characters
for (MIchar *pI = m_pCmdBuffer; *pI != '\0'; pI++)
{
if ((*pI == '\n') || (*pI == '\r'))
{
*pI = '\0';
break;
}
}
return pText;
}
//++ ------------------------------------------------------------------------------------
// Details: Interrupt current and prevent new ReadLine operations.
// Type: Method.
// Args: None.
// Return: None.
// Throws: None.
//--
void
CMICmnStreamStdinLinux::InterruptReadLine(void)
{
fclose(stdin);
}
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