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/* -*- Mode: C ; c-basic-offset: 2 -*- */
/*
* LADI Session Handler (ladish)
*
* Copyright (C) 2008, 2009, 2010 Nedko Arnaudov <nedko@arnaudov.name>
* Copyright (C) 2008 Marc-Olivier Barre
*
**************************************************************************
* This file contains code that implements logging functionality
**************************************************************************
*
* LADI Session Handler 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.
*
* LADI Session Handler 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 LADI Session Handler. If not, see <http://www.gnu.org/licenses/>
* or write to the Free Software Foundation, Inc.,
* 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "../common.h"
#include <errno.h>
#include <time.h>
#include <stdarg.h>
#include <sys/stat.h>
#include "../common/catdup.h"
#include "../common/dirhelpers.h"
#define DEFAULT_XDG_LOG "/.log"
#define LADISH_XDG_SUBDIR "/" BASE_NAME
#define LADISH_XDG_LOG "/" BASE_NAME ".log"
static ino_t g_log_file_ino;
static FILE * g_logfile;
static char * g_log_filename;
static bool ladish_log_open(void)
{
struct stat st;
int ret;
int retry;
if (g_logfile != NULL)
{
ret = stat(g_log_filename, &st);
if (ret != 0 || g_log_file_ino != st.st_ino)
{
fclose(g_logfile);
}
else
{
return true;
}
}
for (retry = 0; retry < 10; retry++)
{
g_logfile = fopen(g_log_filename, "a");
if (g_logfile == NULL)
{
fprintf(stderr, "Cannot open ladishd log file \"%s\": %d (%s)\n", g_log_filename, errno, strerror(errno));
return false;
}
ret = stat(g_log_filename, &st);
if (ret == 0)
{
g_log_file_ino = st.st_ino;
return true;
}
fclose(g_logfile);
g_logfile = NULL;
}
fprintf(stderr, "Cannot stat just opened ladishd log file \"%s\": %d (%s). %d retries\n", g_log_filename, errno, strerror(errno), retry);
return false;
}
void ladish_log_init() __attribute__ ((constructor));
void ladish_log_init()
{
char * ladish_log_dir;
const char * home_dir;
char * xdg_log_home;
home_dir = getenv("HOME");
if (home_dir == NULL)
{
log_error("Environment variable HOME not set");
goto exit;
}
xdg_log_home = catdup(home_dir, DEFAULT_XDG_LOG);
if (xdg_log_home == NULL)
{
log_error("catdup failed for '%s' and '%s'", home_dir, DEFAULT_XDG_LOG);
goto exit;
}
ladish_log_dir = catdup(xdg_log_home, LADISH_XDG_SUBDIR);
if (ladish_log_dir == NULL)
{
log_error("catdup failed for '%s' and '%s'", home_dir, LADISH_XDG_SUBDIR);
goto free_log_home;
}
if (!ensure_dir_exist(xdg_log_home, 0700))
{
goto free_log_dir;
}
if (!ensure_dir_exist(ladish_log_dir, 0700))
{
goto free_log_dir;
}
g_log_filename = catdup(ladish_log_dir, LADISH_XDG_LOG);
if (g_log_filename == NULL)
{
log_error("Out of memory");
goto free_log_dir;
}
ladish_log_open();
free_log_dir:
free(ladish_log_dir);
free_log_home:
free(xdg_log_home);
exit:
return;
}
void ladish_log_uninit() __attribute__ ((destructor));
void ladish_log_uninit()
{
if (g_logfile != NULL)
{
fclose(g_logfile);
}
free(g_log_filename);
}
void
ladish_log(
unsigned int level,
const char * format,
...)
{
va_list ap;
FILE * stream;
time_t timestamp;
char timestamp_str[26];
if (g_logfile != NULL && ladish_log_open())
{
stream = g_logfile;
}
else
{
switch (level)
{
case LADISH_LOG_LEVEL_DEBUG:
case LADISH_LOG_LEVEL_INFO:
stream = stdout;
break;
case LADISH_LOG_LEVEL_WARN:
case LADISH_LOG_LEVEL_ERROR:
case LADISH_LOG_LEVEL_ERROR_PLAIN:
default:
stream = stderr;
}
}
time(×tamp);
ctime_r(×tamp, timestamp_str);
timestamp_str[24] = 0;
fprintf(stream, "%s: ", timestamp_str);
va_start(ap, format);
vfprintf(stream, format, ap);
fflush(stream);
va_end(ap);
}
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