xdasd_log.c

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/*----------------------------------------------------------------------------
 * Copyright (c) 2006, Novell, Inc.
 * All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without 
 * modification, are permitted provided that the following conditions are 
 * met:
 * 
 *     * Redistributions of source code must retain the above copyright 
 *       notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above copyright 
 *       notice, this list of conditions and the following disclaimer in the 
 *       documentation and/or other materials provided with the distribution.
 *     * Neither the name of the Novell nor the names of its contributors 
 *       may be used to endorse or promote products derived from this 
 *       software without specific prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 
 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR 
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF 
 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING 
 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *--------------------------------------------------------------------------*/

#include "xdasd_log.h"

#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
#include <time.h>

#ifndef _WIN32
# include <sys/types.h>
# include <sys/stat.h>
#endif

static FILE * g_xdasd_logfile = 0;

static int g_xdasd_loglevel = 0;

static void log_time(void)
{
   time_t curtime = time(0);
   fprintf(g_xdasd_logfile, "[%.*s] ", 24, ctime(&curtime)); 
}

/*--------------------------------------------------------------------------*/

int xdasd_log_open(const char * path, int append, int level)
{
   g_xdasd_loglevel = level;

   if (g_xdasd_logfile)
      fclose(g_xdasd_logfile);

   if (*path == 0)
      g_xdasd_logfile = stdout; /* Log to console. */
   else
   {
#ifndef _WIN32
      umask(0077); /* only owner can read/write */
#endif        
      if (append)
         g_xdasd_logfile = fopen(path, "a");
      else
         g_xdasd_logfile = fopen(path, "w");

      if (g_xdasd_logfile == 0)
         return -1;  /* could not open the log file */
   }
   return 0;
}

void xdasd_log_close(void)
{
   fclose(g_xdasd_logfile);
   g_xdasd_logfile = 0;
}

int xdasd_log_level(void)
{
   static int checked = 0;

   if (!checked)
   {
      char * llenvstr = getenv("XDASD_LOG_LEVEL");
      int loglevel = llenvstr? atoi(llenvstr): 0;
      if (loglevel > g_xdasd_loglevel)
         g_xdasd_loglevel = loglevel;
      checked = 1;
   }
   return g_xdasd_loglevel;
}

void xdasd_log(int level, const char * msg, ... )
{
   if (g_xdasd_logfile && level <= xdasd_log_level())
   {
      va_list ap;

      log_time();

      va_start(ap, msg);
      vfprintf(g_xdasd_logfile, msg, ap); 
      va_end(ap);
      fflush(g_xdasd_logfile);
   }
}

void xdasd_fatal(const char * msg, ... )
{
   FILE * f = g_xdasd_logfile? g_xdasd_logfile: stderr;
   va_list ap;

   log_time();

   fprintf(f, "FATAL: ");
   va_start(ap, msg);
   vfprintf(f, msg, ap);
   va_end(ap);
   exit(1);
}