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/*********************************************************
* Copyright (C) 2010 VMware, Inc. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as published
* by the Free Software Foundation version 2.1 and no 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 Lesser GNU General Public
* License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
*********************************************************/
/**
* @file stdLogger.c
*
* A very simplified version of a file logger that uses the standard output
* streams (stdout / stderr).
*/
#include "glibUtils.h"
#include <stdio.h>
#if defined(_WIN32)
static GStaticMutex gConsoleLock = G_STATIC_MUTEX_INIT;
static gint gRefCount = 0;
#endif
typedef struct StdLogger {
GlibLogger handler;
#if defined(_WIN32)
gboolean attached;
#endif
} StdLogger;
/*
*******************************************************************************
* StdLoggerLog -- */ /**
*
* Logs a message to stdout or stderr depending on its severity.
*
* @param[in] domain Unused.
* @param[in] level Log level.
* @param[in] message Message to log.
* @param[in] data Logger data.
*
*******************************************************************************
*/
static void
StdLoggerLog(const gchar *domain,
GLogLevelFlags level,
const gchar *message,
gpointer data)
{
gchar *local;
FILE *dest = (level < G_LOG_LEVEL_MESSAGE) ? stderr : stdout;
#if defined(_WIN32)
StdLogger *sdata = data;
if (!sdata->attached) {
g_static_mutex_lock(&gConsoleLock);
if (gRefCount != 0 || GlibUtils_AttachConsole()) {
gRefCount++;
sdata->attached = TRUE;
}
g_static_mutex_unlock(&gConsoleLock);
}
if (!sdata->attached) {
return;
}
#endif
local = g_locale_from_utf8(message, -1, NULL, NULL, NULL);
if (local != NULL) {
fputs(local, dest);
g_free(local);
} else {
fputs(message, dest);
}
}
/*
*******************************************************************************
* StdLoggerDestroy -- */ /**
*
* Cleans up the internal state of the logger.
*
* @param[in] data Logger data.
*
*******************************************************************************
*/
static void
StdLoggerDestroy(gpointer data)
{
#if defined(_WIN32)
StdLogger *sdata = data;
g_static_mutex_lock(&gConsoleLock);
if (sdata->attached && --gRefCount == 0) {
FreeConsole();
}
g_static_mutex_unlock(&gConsoleLock);
#endif
g_free(data);
}
#if defined(_WIN32)
/*
*******************************************************************************
* GlibUtilsIsRedirected -- */ /**
*
* Checks whether given standard device (standard input, standard output,
* or standard error) has been redirected to an on-disk file/pipe.
* Win32-only.
*
* @param[in] nStdHandle The standard device number.
*
* @return TRUE if device redirected to a file/pipe.
*
*******************************************************************************
*/
static gboolean
GlibUtilsIsRedirected(DWORD nStdHandle)
{
HANDLE handle = GetStdHandle(nStdHandle);
DWORD type = handle ? GetFileType(handle) : FILE_TYPE_UNKNOWN;
return type == FILE_TYPE_DISK || type == FILE_TYPE_PIPE;
}
/*
*******************************************************************************
* GlibUtils_AttachConsole -- */ /**
*
* Attaches a console to the current process. If the parent process already has
* a console open, reuse it. Otherwise, create a new console for the current
* process. Win32-only.
*
* It's safe to call this function multiple times (it won't do anything if
* the process already has a console).
*
* @note Attaching to the parent process's console is only available on XP and
* later.
*
* @return Whether the process is attached to a console.
*
*******************************************************************************
*/
gboolean
GlibUtils_AttachConsole(void)
{
typedef BOOL (WINAPI *AttachConsoleFn)(DWORD);
gboolean ret = TRUE;
AttachConsoleFn _AttachConsole;
BOOL reopenStdout;
BOOL reopenStderr;
if (GetConsoleWindow() != NULL) {
goto exit;
}
reopenStdout = !GlibUtilsIsRedirected(STD_OUTPUT_HANDLE);
reopenStderr = !GlibUtilsIsRedirected(STD_ERROR_HANDLE);
if (!reopenStdout && !reopenStderr) {
goto exit;
}
_AttachConsole = (AttachConsoleFn) GetProcAddress(GetModuleHandleW(L"kernel32.dll"),
"AttachConsole");
if ((_AttachConsole != NULL && _AttachConsole(ATTACH_PARENT_PROCESS)) ||
AllocConsole()) {
FILE *fptr;
if (reopenStdout) {
fptr = _wfreopen(L"CONOUT$", L"a", stdout);
if (fptr == NULL) {
g_warning("_wfreopen failed for stdout/CONOUT$: %d (%s)",
errno, strerror(errno));
ret = FALSE;
}
}
if (reopenStderr) {
fptr = _wfreopen(L"CONOUT$", L"a", stderr);
if (fptr == NULL) {
g_warning("_wfreopen failed for stderr/CONOUT$: %d (%s)",
errno, strerror(errno));
ret = FALSE;
} else {
setvbuf(fptr, NULL, _IONBF, 0);
}
}
} else {
ret = FALSE;
}
exit:
if (!ret) {
g_warning("Console redirection unavailable.");
}
return ret;
}
#endif
/*
*******************************************************************************
* GlibUtils_CreateStdLogger -- */ /**
*
* @brief Configures a new std logger.
*
* @return A new logger instance.
*
*******************************************************************************
*/
GlibLogger *
GlibUtils_CreateStdLogger(void)
{
StdLogger *data = g_new0(StdLogger, 1);
data->handler.logfn = StdLoggerLog;
data->handler.addsTimestamp = FALSE;
data->handler.shared = FALSE;
data->handler.dtor = StdLoggerDestroy;
return &data->handler;
}
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