daemon/log.c

   1 /* -*- Mode: C ; c-basic-offset: 2 -*- */
   2 /*
   3  * LADI Session Handler (ladish)
   4  *
   5  * Copyright (C) 2008, 2009 Nedko Arnaudov <nedko@arnaudov.name>
   6  * Copyright (C) 2008 Marc-Olivier Barre
   7  *
   8  **************************************************************************
   9  * This file contains code that implements logging functionality
  10  **************************************************************************
  11  *
  12  * LADI Session Handler is free software; you can redistribute it and/or modify
  13  * it under the terms of the GNU General Public License as published by
  14  * the Free Software Foundation; either version 2 of the License, or
  15  * (at your option) any later version.
  16  *
  17  * LADI Session Handler is distributed in the hope that it will be useful,
  18  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  19  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20  * GNU General Public License for more details.
  21  *
  22  * You should have received a copy of the GNU General Public License
  23  * along with LADI Session Handler. If not, see <http://www.gnu.org/licenses/>
  24  * or write to the Free Software Foundation, Inc.,
  25  * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  26  */
  27
  28 #include "../common.h"
  29
  30 #include <errno.h>
  31 #include <time.h>
  32 #include <stdarg.h>
  33
  34 #include "../catdup.h"
  35 #include "dirhelpers.h"
  36
  37 #define DEFAULT_XDG_LOG "/.log"
  38 #define LASH_XDG_SUBDIR "/" BASE_NAME
  39 #define LASH_XDG_LOG "/" BASE_NAME ".log"
  40
  41 FILE * g_logfile;
  42
  43 void lash_log_init() __attribute__ ((constructor));
  44 void lash_log_init()
  45 {
  46   char * log_filename;
  47   size_t log_len;
  48   char * lash_log_dir;
  49   size_t lash_log_dir_len; /* without terminating '\0' char */
  50   const char * home_dir;
  51   char * xdg_log_home;
  52
  53   home_dir = getenv("HOME");
  54   if (home_dir == NULL)
  55   {
  56     lash_error("Environment variable HOME not set");
  57     goto exit;
  58   }
  59
  60   xdg_log_home = catdup(home_dir, DEFAULT_XDG_LOG);
  61   if (xdg_log_home == NULL)
  62   {
  63     lash_error("catdup failed for '%s' and '%s'", home_dir, DEFAULT_XDG_LOG);
  64     goto exit;
  65   }
  66
  67   lash_log_dir = catdup(xdg_log_home, LASH_XDG_SUBDIR);
  68   if (lash_log_dir == NULL)
  69   {
  70     lash_error("catdup failed for '%s' and '%s'", home_dir, LASH_XDG_SUBDIR);
  71     goto free_log_home;
  72   }
  73
  74   if (!ensure_dir_exist(xdg_log_home, 0700))
  75   {
  76     goto free_log_dir;
  77   }
  78
  79   if (!ensure_dir_exist(lash_log_dir, 0700))
  80   {
  81     goto free_log_dir;
  82   }
  83
  84   lash_log_dir_len = strlen(lash_log_dir);
  85
  86   log_len = strlen(LASH_XDG_LOG);
  87
  88   log_filename = malloc(lash_log_dir_len + log_len + 1);
  89   if (log_filename == NULL)
  90   {
  91     lash_error("Out of memory");
  92     goto free_log_dir;
  93   }
  94
  95   memcpy(log_filename, lash_log_dir, lash_log_dir_len);
  96   memcpy(log_filename + lash_log_dir_len, LASH_XDG_LOG, log_len);
  97   log_filename[lash_log_dir_len + log_len] = 0;
  98
  99   g_logfile = fopen(log_filename, "a");
 100   if (g_logfile == NULL)
 101   {
 102     lash_error("Cannot open jackdbus log file \"%s\": %d (%s)\n", log_filename, errno, strerror(errno));
 103   }
 104
 105   free(log_filename);
 106
 107 free_log_dir:
 108   free(lash_log_dir);
 109
 110 free_log_home:
 111   free(xdg_log_home);
 112
 113 exit:
 114   return;
 115 }
 116
 117 void lash_log_uninit()  __attribute__ ((destructor));
 118 void lash_log_uninit()
 119 {
 120   if (g_logfile != NULL)
 121   {
 122     fclose(g_logfile);
 123   }
 124 }
 125
 126 void
 127 lash_log(
 128   unsigned int level,
 129   const char * format,
 130   ...)
 131 {
 132   va_list ap;
 133   FILE * stream;
 134   time_t timestamp;
 135   char timestamp_str[26];
 136
 137   if (g_logfile != NULL)
 138   {
 139     stream = g_logfile;
 140   }
 141   else
 142   {
 143     switch (level)
 144     {
 145     case LASH_LOG_LEVEL_DEBUG:
 146     case LASH_LOG_LEVEL_INFO:
 147       stream = stdout;
 148       break;
 149     case LASH_LOG_LEVEL_WARN:
 150     case LASH_LOG_LEVEL_ERROR:
 151     case LASH_LOG_LEVEL_ERROR_PLAIN:
 152     default:
 153       stream = stderr;
 154     }
 155   }
 156
 157   time(&timestamp);
 158   ctime_r(&timestamp, timestamp_str);
 159   timestamp_str[24] = 0;
 160
 161   fprintf(stream, "%s: ", timestamp_str);
 162
 163   va_start(ap, format);
 164   vfprintf(stream, format, ap);
 165   fflush(stream);
 166   va_end(ap);
 167 }