[privoxy.git] / errlog.c

const char errlog_rcs[] = "$Id: errlog.c,v 1.90 2009/03/18 20:43:19 fabiankeil Exp $";
/*********************************************************************
 *
 * File        :  $Source: /cvsroot/ijbswa/current/errlog.c,v $
 *
 * Purpose     :  Log errors to a designated destination in an elegant,
 *                printf-like fashion.
 *
 * Copyright   :  Written by and Copyright (C) 2001-2009 the SourceForge
 *                Privoxy team. http://www.privoxy.org/
 *
 *                Based on the Internet Junkbuster originally written
 *                by and Copyright (C) 1997 Anonymous Coders and 
 *                Junkbusters Corporation.  http://www.junkbusters.com
 *
 *                This program 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.
 *
 *                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 GNU General Public
 *                License for more details.
 *
 *                The GNU General Public License should be included with
 *                this file.  If not, you can view it at
 *                http://www.gnu.org/copyleft/gpl.html
 *                or write to the Free Software Foundation, Inc., 59
 *                Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 *
 * Revisions   :
 *    $Log: errlog.c,v $
 *    Revision 1.90  2009/03/18 20:43:19  fabiankeil
 *    Don't enable LOG_LEVEL_INFO by default and don't apply the user's
 *    debug settings until the logfile has been opened (if there is one).
 *    Patch submitted by Roland in #2624120.
 *
 *    Revision 1.89  2009/03/07 12:56:12  fabiankeil
 *    Add log_error() support for unsigned long long (%lld).
 *
 *    Revision 1.88  2009/03/07 11:34:36  fabiankeil
 *    Omit timestamp and thread id in the mingw32 message box.
 *
 *    Revision 1.87  2009/03/01 18:28:24  fabiankeil
 *    Help clang understand that we aren't dereferencing
 *    NULL pointers here.
 *
 *    Revision 1.86  2009/02/09 21:21:15  fabiankeil
 *    Now that init_log_module() is called earlier, call show_version()
 *    later on from main() directly so it doesn't get called for --help
 *    or --version.
 *
 *    Revision 1.85  2009/02/06 17:51:38  fabiankeil
 *    Be prepared if I break the log module initialization again.
 *
 *    Revision 1.84  2008/12/14 15:46:22  fabiankeil
 *    Give crunched requests their own log level.
 *
 *    Revision 1.83  2008/12/04 18:14:32  fabiankeil
 *    Fix some cparser warnings.
 *
 *    Revision 1.82  2008/11/23 16:06:58  fabiankeil
 *    Update a log message I missed in 1.80.
 *
 *    Revision 1.81  2008/11/23 15:59:27  fabiankeil
 *    - Update copyright range.
 *    - Remove stray line breaks in a log message
 *      nobody is supposed to see anyway.
 *
 *    Revision 1.80  2008/11/23 15:49:49  fabiankeil
 *    In log_error(), don't surround the thread id with "Privoxy(" and ")".
 *
 *    Revision 1.79  2008/10/20 17:09:25  fabiankeil
 *    Update init_error_log() description to match reality.
 *
 *    Revision 1.78  2008/09/07 16:59:31  fabiankeil
 *    Update a comment to reflect that we
 *    have mutex support on mingw32 now.
 *
 *    Revision 1.77  2008/09/07 12:43:44  fabiankeil
 *    Move the LogPutString() call in log_error() into the locked
 *    region so the Windows GUI log is consistent with the logfile.
 *
 *    Revision 1.76  2008/09/07 12:35:05  fabiankeil
 *    Add mutex lock support for _WIN32.
 *
 *    Revision 1.75  2008/09/04 08:13:58  fabiankeil
 *    Prepare for critical sections on Windows by adding a
 *    layer of indirection before the pthread mutex functions.
 *
 *    Revision 1.74  2008/08/06 18:33:36  fabiankeil
 *    If the "close fd first" workaround doesn't work,
 *    the fatal error message will be lost, so we better
 *    explain the consequences while we still can.
 *
 *    Revision 1.73  2008/08/04 19:06:55  fabiankeil
 *    Add a lame workaround for the "can't open an already open
 *    logfile on OS/2" problem reported by Maynard in #2028842
 *    and describe what a real solution would look like.
 *
 *    Revision 1.72  2008/07/27 12:04:28  fabiankeil
 *    Fix a comment typo.
 *
 *    Revision 1.71  2008/06/28 17:17:15  fabiankeil
 *    Remove another stray semicolon.
 *
 *    Revision 1.70  2008/06/28 17:10:29  fabiankeil
 *    Remove stray semicolon in get_log_timestamp().
 *    Reported by Jochen Voss in #2005221.
 *
 *    Revision 1.69  2008/05/30 15:55:25  fabiankeil
 *    Declare variable "debug" static and complain about its name.
 *
 *    Revision 1.68  2008/04/27 16:50:46  fabiankeil
 *    Remove an incorrect assertion. The value of debug may change if
 *    the configuration is reloaded in another thread. While we could
 *    cache the initial value, the assertion doesn't seem worth it.
 *
 *    Revision 1.67  2008/03/27 18:27:23  fabiankeil
 *    Remove kill-popups action.
 *
 *    Revision 1.66  2008/01/31 15:38:14  fabiankeil
 *    - Make the logfp assertion more strict. As of 1.63, the "||" could
 *      have been an "&&", which means we can use two separate assertions
 *      and skip on of them on Windows.
 *    - Break a long commit message line in two.
 *
 *    Revision 1.65  2008/01/31 14:44:33  fabiankeil
 *    Use (a != b) instead of !(a == b) so the sanity check looks less insane.
 *
 *    Revision 1.64  2008/01/21 18:56:46  david__schmidt
 *    Swap #def from negative to positive, re-joined it so it didn't
 *    span an assertion (compilation failure on OS/2)
 *
 *    Revision 1.63  2007/12/15 19:49:32  fabiankeil
 *    Stop overloading logfile to control the mingw32 log window as well.
 *    It's no longer necessary now that we disable all debug lines by default
 *    and at least one user perceived it as a regression (added in 1.55).
 *
 *    Revision 1.62  2007/11/30 15:33:46  fabiankeil
 *    Unbreak LOG_LEVEL_FATAL. It wasn't fatal with logging disabled
 *    and on mingw32 fatal log messages didn't end up in the log file.
 *
 *    Revision 1.61  2007/11/04 19:03:01  fabiankeil
 *    Fix another deadlock Hal spotted and that mysteriously didn't affect FreeBSD.
 *
 *    Revision 1.60  2007/11/03 19:03:31  fabiankeil
 *    - Prevent the Windows GUI from showing the version two times in a row.
 *    - Stop using the imperative in the "(Re-)Open logfile" message.
 *    - Ditch the "Switching to daemon mode" message as the detection
 *      whether or not we're already in daemon mode doesn't actually work.
 *
 *    Revision 1.59  2007/11/01 12:50:56  fabiankeil
 *    Here's looking at you, deadlock.
 *
 *    Revision 1.58  2007/10/28 19:04:21  fabiankeil
 *    Don't mention daemon mode in "Logging disabled" message. Some
 *    platforms call it differently and it's not really relevant anyway.
 *
 *    Revision 1.57  2007/10/27 13:02:26  fabiankeil
 *    Relocate daemon-mode-related log messages to make sure
 *    they aren't shown again in case of configuration reloads.
 *
 *    Revision 1.56  2007/10/14 14:26:56  fabiankeil
 *    Remove the old log_error() version.
 *
 *    Revision 1.55  2007/10/14 14:12:41  fabiankeil
 *    When in daemon mode, close stderr after the configuration file has been
 *    parsed the first time. If logfile isn't set, stop logging. Fixes BR#897436.
 *
 *    Revision 1.54  2007/09/22 16:15:34  fabiankeil
 *    - Let it compile with pcc.
 *    - Move our includes below system includes to prevent macro conflicts.
 *
 *    Revision 1.53  2007/08/05 13:53:14  fabiankeil
 *    #1763173 from Stefan Huehner: declare some more functions
 *    static and use void instead of empty parameter lists.
 *
 *    Revision 1.52  2007/07/14 07:28:47  fabiankeil
 *    Add translation function for JB_ERR_FOO codes.
 *
 *    Revision 1.51  2007/05/11 11:51:34  fabiankeil
 *    Fix a type mismatch warning.
 *
 *    Revision 1.50  2007/04/11 10:55:44  fabiankeil
 *    Enforce some assertions that could be triggered
 *    on mingw32 and other systems where we use threads
 *    but no locks.
 *
 *    Revision 1.49  2007/04/08 16:44:15  fabiankeil
 *    We need <sys/time.h> for gettimeofday(), not <time.h>.
 *
 *    Revision 1.48  2007/03/31 13:33:28  fabiankeil
 *    Add alternative log_error() with timestamps
 *    that contain milliseconds and without using
 *    strcpy(), strcat() or sprintf().
 *
 *    Revision 1.47  2006/11/28 15:25:15  fabiankeil
 *    Only unlink the pidfile if it's actually used.
 *
 *    Revision 1.46  2006/11/13 19:05:51  fabiankeil
 *    Make pthread mutex locking more generic. Instead of
 *    checking for OSX and OpenBSD, check for FEATURE_PTHREAD
 *    and use mutex locking unless there is an _r function
 *    available. Better safe than sorry.
 *
 *    Fixes "./configure --disable-pthread" and should result
 *    in less threading-related problems on pthread-using platforms,
 *    but it still doesn't fix BR#1122404.
 *
 *    Revision 1.45  2006/08/21 11:15:54  david__schmidt
 *    MS Visual C++ build updates
 *
 *    Revision 1.44  2006/08/18 16:03:16  david__schmidt
 *    Tweak for OS/2 build happiness.
 *
 *    Revision 1.43  2006/08/03 02:46:41  david__schmidt
 *    Incorporate Fabian Keil's patch work:
 *    http://www.fabiankeil.de/sourcecode/privoxy/
 *
 *    Revision 1.42  2006/07/18 14:48:46  david__schmidt
 *    Reorganizing the repository: swapping out what was HEAD (the old 3.1 branch)
 *    with what was really the latest development (the v_3_0_branch branch)
 *
 *    Revision 1.40.2.4  2005/04/03 20:10:50  david__schmidt
 *    Thanks to Jindrich Makovicka for a race condition fix for the log
 *    file.  The race condition remains for non-pthread implementations.
 *    Reference patch #1175720.
 *
 *    Revision 1.40.2.3  2003/03/07 03:41:04  david__schmidt
 *    Wrapping all *_r functions (the non-_r versions of them) with mutex 
 *    semaphores for OSX.  Hopefully this will take care of all of those pesky
 *    crash reports.
 *
 *    Revision 1.40.2.2  2002/09/28 00:30:57  david__schmidt
 *    Update error logging to give sane values for thread IDs on Mach kernels.
 *    It's still a hack, but at least it looks farily normal.  We print the
 *    absolute value of the first 4 bytes of the pthread_t modded with 1000.
 *
 *    Revision 1.40.2.1  2002/09/25 12:47:42  oes
 *    Make log_error safe against NULL string arguments
 *
 *    Revision 1.40  2002/05/22 01:27:27  david__schmidt
 *
 *    Add os2_socket_strerr mirroring w32_socket_strerr.
 *
 *    Revision 1.39  2002/04/03 17:15:27  gliptak
 *    zero padding thread ids in log
 *
 *    Revision 1.38  2002/03/31 17:18:59  jongfoster
 *    Win32 only: Enabling STRICT to fix a VC++ compile warning.
 *
 *    Revision 1.37  2002/03/27 14:32:43  david__schmidt
 *    More compiler warning message maintenance
 *
 *    Revision 1.36  2002/03/26 22:29:54  swa
 *    we have a new homepage!
 *
 *    Revision 1.35  2002/03/24 15:23:33  jongfoster
 *    Name changes
 *
 *    Revision 1.34  2002/03/24 13:25:43  swa
 *    name change related issues
 *
 *    Revision 1.33  2002/03/13 00:27:04  jongfoster
 *    Killing warnings
 *
 *    Revision 1.32  2002/03/07 03:46:17  oes
 *    Fixed compiler warnings
 *
 *    Revision 1.31  2002/03/06 23:02:57  jongfoster
 *    Removing tabs
 *
 *    Revision 1.30  2002/03/05 22:43:45  david__schmidt
 *    - Better error reporting on OS/2
 *    - Fix double-slash comment (oops)
 *
 *    Revision 1.29  2002/03/04 23:45:13  jongfoster
 *    Printing thread ID if using Win32 native threads
 *
 *    Revision 1.28  2002/03/04 17:59:59  oes
 *    Deleted deletePidFile(), cosmetics
 *
 *    Revision 1.27  2002/03/04 02:08:01  david__schmidt
 *    Enable web editing of actions file on OS/2 (it had been broken all this time!)
 *
 *    Revision 1.26  2002/01/09 19:05:45  steudten
 *    Fix big memory leak.
 *
 *    Revision 1.25  2002/01/09 14:32:08  oes
 *    Added support for gmtime_r and localtime_r.
 *
 *    Revision 1.24  2001/12/30 14:07:32  steudten
 *    - Add signal handling (unix)
 *    - Add SIGHUP handler (unix)
 *    - Add creation of pidfile (unix)
 *    - Add action 'top' in rc file (RH)
 *    - Add entry 'SIGNALS' to manpage
 *    - Add exit message to logfile (unix)
 *
 *    Revision 1.23  2001/11/07 00:02:13  steudten
 *    Add line number in error output for lineparsing for
 *    actionsfile and configfile.
 *    Special handling for CLF added.
 *
 *    Revision 1.22  2001/11/05 23:43:05  steudten
 *    Add time+date to log files.
 *
 *    Revision 1.21  2001/10/25 03:40:47  david__schmidt
 *    Change in porting tactics: OS/2's EMX porting layer doesn't allow multiple
 *    threads to call select() simultaneously.  So, it's time to do a real, live,
 *    native OS/2 port.  See defines for __EMX__ (the porting layer) vs. __OS2__
 *    (native). Both versions will work, but using __OS2__ offers multi-threading.
 *
 *    Revision 1.20  2001/09/16 23:04:34  jongfoster
 *    Fixing a warning
 *
 *    Revision 1.19  2001/09/13 20:08:06  jongfoster
 *    Adding support for LOG_LEVEL_CGI
 *
 *    Revision 1.18  2001/09/10 11:27:24  oes
 *    Declaration of w32_socket_strerr now conditional
 *
 *    Revision 1.17  2001/09/10 10:17:13  oes
 *    Removed unused variable; Fixed sprintf format
 *
 *    Revision 1.16  2001/07/30 22:08:36  jongfoster
 *    Tidying up #defines:
 *    - All feature #defines are now of the form FEATURE_xxx
 *    - Permanently turned off WIN_GUI_EDIT
 *    - Permanently turned on WEBDAV and SPLIT_PROXY_ARGS
 *
 *    Revision 1.15  2001/07/29 17:41:10  jongfoster
 *    Now prints thread ID for each message (pthreads only)
 *
 *    Revision 1.14  2001/07/19 19:03:48  haroon
 *    - Added case for LOG_LEVEL_POPUPS
 *
 *    Revision 1.13  2001/07/13 13:58:58  oes
 *     - Added case for LOG_LEVEL_DEANIMATE
 *     - Removed all #ifdef PCRS
 *
 *    Revision 1.12  2001/06/09 10:55:28  jongfoster
 *    Changing BUFSIZ ==> BUFFER_SIZE
 *
 *    Revision 1.11  2001/06/01 18:14:49  jongfoster
 *    Changing the calls to strerr() to check HAVE_STRERR (which is defined
 *    in config.h if appropriate) rather than the NO_STRERR macro.
 *
 *    Revision 1.10  2001/05/29 11:52:21  oes
 *    Conditional compilation of w32_socket_error
 *
 *    Revision 1.9  2001/05/28 16:15:17  jongfoster
 *    Improved reporting of errors under Win32.
 *
 *    Revision 1.8  2001/05/26 17:25:14  jongfoster
 *    Added support for CLF (Common Log Format) and fixed LOG_LEVEL_LOG
 *
 *    Revision 1.7  2001/05/26 15:21:28  jongfoster
 *    Activity animation in Win32 GUI now works even if debug==0
 *
 *    Revision 1.6  2001/05/25 21:55:08  jongfoster
 *    Now cleans up properly on FATAL (removes taskbar icon etc)
 *
 *    Revision 1.5  2001/05/22 18:46:04  oes
 *
 *    - Enabled filtering banners by size rather than URL
 *      by adding patterns that replace all standard banner
 *      sizes with the "Junkbuster" gif to the re_filterfile
 *
 *    - Enabled filtering WebBugs by providing a pattern
 *      which kills all 1x1 images
 *
 *    - Added support for PCRE_UNGREEDY behaviour to pcrs,
 *      which is selected by the (nonstandard and therefore
 *      capital) letter 'U' in the option string.
 *      It causes the quantifiers to be ungreedy by default.
 *      Appending a ? turns back to greedy (!).
 *
 *    - Added a new interceptor ijb-send-banner, which
 *      sends back the "Junkbuster" gif. Without imagelist or
 *      MSIE detection support, or if tinygif = 1, or the
 *      URL isn't recognized as an imageurl, a lame HTML
 *      explanation is sent instead.
 *
 *    - Added new feature, which permits blocking remote
 *      script redirects and firing back a local redirect
 *      to the browser.
 *      The feature is conditionally compiled, i.e. it
 *      can be disabled with --disable-fast-redirects,
 *      plus it must be activated by a "fast-redirects"
 *      line in the config file, has its own log level
 *      and of course wants to be displayed by show-proxy-args
 *      Note: Boy, all the #ifdefs in 1001 locations and
 *      all the fumbling with configure.in and acconfig.h
 *      were *way* more work than the feature itself :-(
 *
 *    - Because a generic redirect template was needed for
 *      this, tinygif = 3 now uses the same.
 *
 *    - Moved GIFs, and other static HTTP response templates
 *      to project.h
 *
 *    - Some minor fixes
 *
 *    - Removed some >400 CRs again (Jon, you really worked
 *      a lot! ;-)
 *
 *    Revision 1.4  2001/05/21 19:32:54  jongfoster
 *    Added another #ifdef _WIN_CONSOLE
 *
 *    Revision 1.3  2001/05/20 01:11:40  jongfoster
 *    Added support for LOG_LEVEL_FATAL
 *    Renamed LOG_LEVEL_FRC to LOG_LEVEL_FORCE,
 *    and LOG_LEVEL_REF to LOG_LEVEL_RE_FILTER
 *
 *    Revision 1.2  2001/05/17 22:42:01  oes
 *     - Cleaned CRLF's from the sources and related files
 *     - Repaired logging for REF and FRC
 *
 *    Revision 1.1.1.1  2001/05/15 13:58:51  oes
 *    Initial import of version 2.9.3 source tree
 *
 *
 *********************************************************************/
\f

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

#include "config.h"
#include "miscutil.h"

/* For gettimeofday() */
#include <sys/time.h>

#if !defined(_WIN32) && !defined(__OS2__)
#include <unistd.h>
#endif /* !defined(_WIN32) && !defined(__OS2__) */

#include <errno.h>
#include <assert.h>

#ifdef _WIN32
#ifndef STRICT
#define STRICT
#endif
#include <windows.h>
#ifndef _WIN_CONSOLE
#include "w32log.h"
#endif /* ndef _WIN_CONSOLE */
#endif /* def _WIN32 */
#ifdef _MSC_VER
#define inline __inline
#endif /* def _MSC_VER */

#ifdef __OS2__
#include <sys/socket.h> /* For sock_errno */
#define INCL_DOS
#include <os2.h>
#endif

#include "errlog.h"
#include "project.h"
#include "jcc.h"

const char errlog_h_rcs[] = ERRLOG_H_VERSION;


/*
 * LOG_LEVEL_FATAL cannot be turned off.  (There are
 * some exceptional situations where we need to get a
 * message to the user).
 */
#define LOG_LEVEL_MINIMUM  LOG_LEVEL_FATAL

/* where to log (default: stderr) */
static FILE *logfp = NULL;

/* logging detail level. XXX: stupid name. */
static int debug = (LOG_LEVEL_FATAL | LOG_LEVEL_ERROR);

/* static functions */
static void fatal_error(const char * error_message);
#ifdef _WIN32
static char *w32_socket_strerr(int errcode, char *tmp_buf);
#endif
#ifdef __OS2__
static char *os2_socket_strerr(int errcode, char *tmp_buf);
#endif

#ifdef MUTEX_LOCKS_AVAILABLE
static inline void lock_logfile(void)
{
   privoxy_mutex_lock(&log_mutex);
}
static inline void unlock_logfile(void)
{
   privoxy_mutex_unlock(&log_mutex);
}
static inline void lock_loginit(void)
{
   privoxy_mutex_lock(&log_init_mutex);
}
static inline void unlock_loginit(void)
{
   privoxy_mutex_unlock(&log_init_mutex);
}
#else /* ! MUTEX_LOCKS_AVAILABLE */
/*
 * FIXME we need a cross-platform locking mechanism.
 * The locking/unlocking functions below should be 
 * fleshed out for non-pthread implementations.
 */ 
static inline void lock_logfile() {}
static inline void unlock_logfile() {}
static inline void lock_loginit() {}
static inline void unlock_loginit() {}
#endif

/*********************************************************************
 *
 * Function    :  fatal_error
 *
 * Description :  Displays a fatal error to standard error (or, on 
 *                a WIN32 GUI, to a dialog box), and exits Privoxy
 *                with status code 1.
 *
 * Parameters  :
 *          1  :  error_message = The error message to display.
 *
 * Returns     :  Does not return.
 *
 *********************************************************************/
static void fatal_error(const char *error_message)
{
#if defined(_WIN32) && !defined(_WIN_CONSOLE)
   /* Skip timestamp and thread id for the message box. */
   const char *box_message = strstr(error_message, "Fatal error");
   if (NULL == box_message)
   {
      /* Shouldn't happen but ... */
      box_message = error_message;
   }
   MessageBox(g_hwndLogFrame, box_message, "Privoxy Error", 
      MB_OK | MB_ICONERROR | MB_TASKMODAL | MB_SETFOREGROUND | MB_TOPMOST);  

   /* Cleanup - remove taskbar icon etc. */
   TermLogWindow();
#endif /* defined(_WIN32) && !defined(_WIN_CONSOLE) */

   if (logfp != NULL)
   {
      fputs(error_message, logfp);
   }

#if defined(unix)
   if (pidfile)
   {
      unlink(pidfile);
   }
#endif /* unix */

   exit(1);
}


/*********************************************************************
 *
 * Function    :  show_version
 *
 * Description :  Logs the Privoxy version and the program name.
 *
 * Parameters  :
 *          1  :  prog_name = The program name.
 *
 * Returns     :  Nothing.
 *
 *********************************************************************/
void show_version(const char *prog_name)
{
   log_error(LOG_LEVEL_INFO, "Privoxy version " VERSION);
   if (prog_name != NULL)
   {
      log_error(LOG_LEVEL_INFO, "Program name: %s", prog_name);
   }
}


/*********************************************************************
 *
 * Function    :  init_log_module
 *
 * Description :  Initializes the logging module to log to stderr.
 *                Can only be called while stderr hasn't been closed
 *                yet and is only supposed to be called once.
 *
 * Parameters  :
 *          1  :  prog_name = The program name.
 *
 * Returns     :  Nothing.
 *
 *********************************************************************/
void init_log_module(void)
{
   lock_logfile();
   logfp = stderr;
   unlock_logfile();
   set_debug_level(debug);
}


/*********************************************************************
 *
 * Function    :  set_debug_level
 *
 * Description :  Sets the debug level to the provided value
 *                plus LOG_LEVEL_MINIMUM.
 *
 *                XXX: we should only use the LOG_LEVEL_MINIMUM
 *                until the first time the configuration file has
 *                been parsed.
 *                
 * Parameters  :  1: debug_level = The debug level to set.
 *
 * Returns     :  Nothing.
 *
 *********************************************************************/
void set_debug_level(int debug_level)
{
   debug = debug_level | LOG_LEVEL_MINIMUM;
}


/*********************************************************************
 *
 * Function    :  disable_logging
 *
 * Description :  Disables logging.
 *                
 * Parameters  :  None.
 *
 * Returns     :  Nothing.
 *
 *********************************************************************/
void disable_logging(void)
{
   if (logfp != NULL)
   {
      log_error(LOG_LEVEL_INFO,
         "No logfile configured. Please enable it before reporting any problems.");
      lock_logfile();
      fclose(logfp);
      logfp = NULL;
      unlock_logfile();
   }
}


/*********************************************************************
 *
 * Function    :  init_error_log
 *
 * Description :  Initializes the logging module to log to a file.
 *
 *                XXX: should be renamed.
 *
 * Parameters  :
 *          1  :  prog_name  = The program name.
 *          2  :  logfname   = The logfile to (re)open.
 *
 * Returns     :  N/A
 *
 *********************************************************************/
void init_error_log(const char *prog_name, const char *logfname)
{
   FILE *fp;

   assert(NULL != logfname);

   lock_loginit();

   if ((logfp != NULL) && (logfp != stderr))
   {
      log_error(LOG_LEVEL_INFO, "(Re-)Opening logfile \'%s\'", logfname);
   }

   /* set the designated log file */
   fp = fopen(logfname, "a");
   if ((NULL == fp) && (logfp != NULL))
   {
      /*
       * Some platforms (like OS/2) don't allow us to open
       * the same file twice, therefore we give it another
       * shot after closing the old file descriptor first.
       *
       * We don't do it right away because it prevents us
       * from logging the "can't open logfile" message to
       * the old logfile.
       *
       * XXX: this is a lame workaround and once the next
       * release is out we should stop bothering reopening
       * the logfile unless we have to.
       *
       * Currently we reopen it every time the config file
       * has been reloaded, but actually we only have to
       * reopen it if the file name changed or if the
       * configuration reloas was caused by a SIGHUP.
       */
      log_error(LOG_LEVEL_INFO, "Failed to reopen logfile: \'%s\'. "
         "Retrying after closing the old file descriptor first. If that "
         "doesn't work, Privoxy will exit without being able to log a message.",
         logfname);
      lock_logfile();
      fclose(logfp);
      logfp = NULL;
      unlock_logfile();
      fp = fopen(logfname, "a");
   }

   if (NULL == fp)
   {
      log_error(LOG_LEVEL_FATAL, "init_error_log(): can't open logfile: \'%s\'", logfname);
   }

   /* set logging to be completely unbuffered */
   setbuf(fp, NULL);

   lock_logfile();
   if (logfp != NULL)
   {
      fclose(logfp);
   }
   logfp = fp;
   unlock_logfile();

#if !defined(_WIN32)
   /*
    * Prevent the Windows GUI from showing the version two
    * times in a row on startup. It already displayed the show_version()
    * call from main() that other systems write to stderr.
    *
    * This means mingw32 users will never see the version in their
    * log file, but I assume they wouldn't look for it there anyway
    * and simply use the "Help/About Privoxy" menu.
    */
   show_version(prog_name);
#endif /* def unix */

   unlock_loginit();

} /* init_error_log */


/*********************************************************************
 *
 * Function    :  get_thread_id
 *
 * Description :  Returns a number that is different for each thread.
 *
 *                XXX: Should be moved elsewhere (miscutil.c?)
 *                
 * Parameters  :  None
 *
 * Returns     :  thread_id
 *
 *********************************************************************/
static long get_thread_id(void)
{
   long this_thread = 1;  /* was: pthread_t this_thread;*/

#ifdef __OS2__
   PTIB     ptib;
   APIRET   ulrc; /* XXX: I have no clue what this does */
#endif /* __OS2__ */

   /* FIXME get current thread id */
#ifdef FEATURE_PTHREAD
   this_thread = (long)pthread_self();
#ifdef __MACH__
   /*
    * Mac OSX (and perhaps other Mach instances) doesn't have a debuggable
    * value at the first 4 bytes of pthread_self()'s return value, a pthread_t.
    * pthread_t is supposed to be opaque... but it's fairly random, though, so
    * we make it mostly presentable.
    */
   this_thread = abs(this_thread % 1000);
#endif /* def __MACH__ */
#elif defined(_WIN32)
   this_thread = GetCurrentThreadId();
#elif defined(__OS2__)
   ulrc = DosGetInfoBlocks(&ptib, NULL);
   if (ulrc == 0)
     this_thread = ptib -> tib_ptib2 -> tib2_ultid;
#endif /* def FEATURE_PTHREAD */

   return this_thread;
}


/*********************************************************************
 *
 * Function    :  get_log_timestamp
 *
 * Description :  Generates the time stamp for the log message prefix.
 *
 * Parameters  :
 *          1  :  buffer = Storage buffer
 *          2  :  buffer_size = Size of storage buffer
 *
 * Returns     :  Number of written characters or 0 for error.
 *
 *********************************************************************/
static inline size_t get_log_timestamp(char *buffer, size_t buffer_size)
{
   size_t length;
   time_t now; 
   struct tm tm_now;
   struct timeval tv_now; /* XXX: stupid name */
   long msecs;
   int msecs_length = 0;

   gettimeofday(&tv_now, NULL);
   msecs = tv_now.tv_usec / 1000;

   time(&now);

#ifdef HAVE_LOCALTIME_R
   tm_now = *localtime_r(&now, &tm_now);
#elif FEATURE_PTHREAD
   privoxy_mutex_lock(&localtime_mutex);
   tm_now = *localtime(&now); 
   privoxy_mutex_unlock(&localtime_mutex);
#else
   tm_now = *localtime(&now); 
#endif

   length = strftime(buffer, buffer_size, "%b %d %H:%M:%S", &tm_now);
   if (length > (size_t)0)
   {
      msecs_length = snprintf(buffer+length, buffer_size - length, ".%.3ld", msecs);               
   }
   if (msecs_length > 0)
   {
      length += (size_t)msecs_length;
   }
   else
   {
      length = 0;
   }

   return length;
}


/*********************************************************************
 *
 * Function    :  get_clf_timestamp
 *
 * Description :  Generates a Common Log Format time string.
 *
 * Parameters  :
 *          1  :  buffer = Storage buffer
 *          2  :  buffer_size = Size of storage buffer
 *
 * Returns     :  Number of written characters or 0 for error.
 *
 *********************************************************************/
static inline size_t get_clf_timestamp(char *buffer, size_t buffer_size)
{
   /*
    * Complex because not all OSs have tm_gmtoff or
    * the %z field in strftime()
    */
   time_t now;
   struct tm *tm_now; 
   struct tm gmt;
#ifdef HAVE_LOCALTIME_R
   struct tm dummy;
#endif
   int days, hrs, mins;
   size_t length;
   int tz_length = 0;

   time (&now); 
#ifdef HAVE_GMTIME_R
   gmt = *gmtime_r(&now, &gmt);
#elif FEATURE_PTHREAD
   privoxy_mutex_lock(&gmtime_mutex);
   gmt = *gmtime(&now);
   privoxy_mutex_unlock(&gmtime_mutex);
#else
   gmt = *gmtime(&now);
#endif
#ifdef HAVE_LOCALTIME_R
   tm_now = localtime_r(&now, &dummy);
#elif FEATURE_PTHREAD
   privoxy_mutex_lock(&localtime_mutex);
   tm_now = localtime(&now); 
   privoxy_mutex_unlock(&localtime_mutex);
#else
   tm_now = localtime(&now); 
#endif
   days = tm_now->tm_yday - gmt.tm_yday; 
   hrs = ((days < -1 ? 24 : 1 < days ? -24 : days * 24) + tm_now->tm_hour - gmt.tm_hour); 
   mins = hrs * 60 + tm_now->tm_min - gmt.tm_min; 

   length = strftime(buffer, buffer_size, "%d/%b/%Y:%H:%M:%S ", tm_now);

   if (length > (size_t)0)
   {
      tz_length = snprintf(buffer+length, buffer_size-length,
                     "%+03d%02d", mins / 60, abs(mins) % 60);
   }
   if (tz_length > 0)
   {
      length += (size_t)tz_length;
   }
   else
   {
      length = 0;
   }

   return length;
}


/*********************************************************************
 *
 * Function    :  get_log_level_string
 *
 * Description :  Translates a numerical loglevel into a string.
 *
 * Parameters  :  
 *          1  :  loglevel = LOG_LEVEL_FOO
 *
 * Returns     :  Log level string.
 *
 *********************************************************************/
static inline const char *get_log_level_string(int loglevel)
{
   char *log_level_string = NULL;

   assert(0 < loglevel);

   switch (loglevel)
   {
      case LOG_LEVEL_ERROR:
         log_level_string = "Error";
         break;
      case LOG_LEVEL_FATAL:
         log_level_string = "Fatal error";
         break;
      case LOG_LEVEL_GPC:
         log_level_string = "Request";
         break;
      case LOG_LEVEL_CONNECT:
         log_level_string = "Connect";
         break;
      case LOG_LEVEL_LOG:
         log_level_string = "Writing";
         break;
      case LOG_LEVEL_HEADER:
         log_level_string = "Header";
         break;
      case LOG_LEVEL_INFO:
         log_level_string = "Info";
         break;
      case LOG_LEVEL_RE_FILTER:
         log_level_string = "Re-Filter";
         break;
#ifdef FEATURE_FORCE_LOAD
      case LOG_LEVEL_FORCE:
         log_level_string = "Force";
         break;
#endif /* def FEATURE_FORCE_LOAD */
#ifdef FEATURE_FAST_REDIRECTS
      case LOG_LEVEL_REDIRECTS:
         log_level_string = "Redirect";
         break;
#endif /* def FEATURE_FAST_REDIRECTS */
      case LOG_LEVEL_DEANIMATE:
         log_level_string = "Gif-Deanimate";
         break;
      case LOG_LEVEL_CRUNCH:
         log_level_string = "Crunch";
         break;
      case LOG_LEVEL_CGI:
         log_level_string = "CGI";
         break;
      default:
         log_level_string = "Unknown log level";
         break;
   }
   assert(NULL != log_level_string);

   return log_level_string;
}


/*********************************************************************
 *
 * Function    :  log_error
 *
 * Description :  This is the error-reporting and logging function.
 *
 * Parameters  :
 *          1  :  loglevel  = the type of message to be logged
 *          2  :  fmt       = the main string we want logged, printf-like
 *          3  :  ...       = arguments to be inserted in fmt (printf-like).
 *
 * Returns     :  N/A
 *
 *********************************************************************/
void log_error(int loglevel, const char *fmt, ...)
{
   va_list ap;
   char *outbuf = NULL;
   static char *outbuf_save = NULL;
   char tempbuf[BUFFER_SIZE];
   size_t length = 0;
   const char * src = fmt;
   long thread_id;
   char timestamp[30];
   /*
    * XXX: Make this a config option,
    * why else do we allocate instead of using
    * an array?
    */
   size_t log_buffer_size = BUFFER_SIZE;

#if defined(_WIN32) && !defined(_WIN_CONSOLE)
   /*
    * Irrespective of debug setting, a GET/POST/CONNECT makes
    * the taskbar icon animate.  (There is an option to disable
    * this but checking that is handled inside LogShowActivity()).
    */
   if ((loglevel == LOG_LEVEL_GPC) || (loglevel == LOG_LEVEL_CRUNCH))
   {
      LogShowActivity();
   }
#endif /* defined(_WIN32) && !defined(_WIN_CONSOLE) */

   /*
    * verify that the loglevel applies to current
    * settings and that logging is enabled.
    * Bail out otherwise.
    */
   if ((0 == (loglevel & debug))
#ifndef _WIN32
      || (logfp == NULL)
#endif
      )
   {
      if (loglevel == LOG_LEVEL_FATAL)
      {
         fatal_error("Fatal error. You're not supposed to"
            "see this message. Please file a bug report.");
      }
      return;
   }

   thread_id = get_thread_id();
   get_log_timestamp(timestamp, sizeof(timestamp));

   /* protect the whole function because of the static buffer (outbuf) */
   lock_logfile();

   if (NULL == outbuf_save) 
   {
      outbuf_save = (char*)zalloc(log_buffer_size + 1); /* +1 for paranoia */
      if (NULL == outbuf_save)
      {
         snprintf(tempbuf, sizeof(tempbuf),
            "%s %08lx Fatal error: Out of memory in log_error().",
            timestamp, thread_id);
         fatal_error(tempbuf); /* Exit */
         return;
      }
   }
   outbuf = outbuf_save;

   /*
    * Memsetting the whole buffer to zero (in theory)
    * makes things easier later on.
    */
   memset(outbuf, 0, log_buffer_size);

   /* Add prefix for everything but Common Log Format messages */
   if (loglevel != LOG_LEVEL_CLF)
   {
      length = (size_t)snprintf(outbuf, log_buffer_size, "%s %08lx %s: ",
         timestamp, thread_id, get_log_level_string(loglevel));
   }

   /* get ready to scan var. args. */
   va_start(ap, fmt);

   /* build formatted message from fmt and var-args */
   while ((*src) && (length < log_buffer_size-2))
   {
      const char *sval = NULL; /* %N string  */
      int ival;                /* %N string length or an error code */
      unsigned uval;           /* %u value */
      long lval;               /* %l value */
      unsigned long ulval;     /* %ul value */
      char ch;
      const char *format_string = tempbuf;

      ch = *src++;
      if (ch != '%')
      {
         outbuf[length++] = ch;
         /*
          * XXX: Only necessary on platforms where multiple threads
          * can write to the buffer at the same time because we
          * don't support mutexes (OS/2 for example).
          */
         outbuf[length] = '\0';
         continue;
      }
      outbuf[length] = '\0';
      ch = *src++;
      switch (ch) {
         case '%':
            tempbuf[0] = '%';
            tempbuf[1] = '\0';
            break;
         case 'd':
            ival = va_arg( ap, int );
            snprintf(tempbuf, sizeof(tempbuf), "%d", ival);
            break;
         case 'u':
            uval = va_arg( ap, unsigned );
            snprintf(tempbuf, sizeof(tempbuf), "%u", uval);
            break;
         case 'l':
            /* this is a modifier that must be followed by u, lu, or d */
            ch = *src++;
            if (ch == 'd')
            {
               lval = va_arg( ap, long );
               snprintf(tempbuf, sizeof(tempbuf), "%ld", lval);
            }
            else if (ch == 'u')
            {
               ulval = va_arg( ap, unsigned long );
               snprintf(tempbuf, sizeof(tempbuf), "%lu", ulval);
            }
            else if ((ch == 'l') && (*src == 'u'))
            {
               unsigned long long lluval = va_arg(ap, unsigned long long);
               snprintf(tempbuf, sizeof(tempbuf), "%llu", lluval);
               ch = *src++;
            }
            else
            {
               snprintf(tempbuf, sizeof(tempbuf), "Bad format string: \"%s\"", fmt);
               loglevel = LOG_LEVEL_FATAL;
            }
            break;
         case 'c':
            /*
             * Note that char paramaters are converted to int, so we need to
             * pass "int" to va_arg.  (See K&R, 2nd ed, section A7.3.2, page 202)
             */
            tempbuf[0] = (char) va_arg(ap, int);
            tempbuf[1] = '\0';
            break;
         case 's':
            format_string = va_arg(ap, char *);
            if (format_string == NULL)
            {
               format_string = "[null]";
            }
            break;
         case 'N':
            /*
             * Non-standard: Print a counted unterminated string.
             * Takes 2 parameters: int length, const char * string.
             */
            ival = va_arg(ap, int);
            sval = va_arg(ap, char *);
            if (sval == NULL)
            {
               format_string = "[null]";
            }
            else if (ival <= 0)
            {
               if (0 == ival)
               {
                  /* That's ok (but stupid) */
                  tempbuf[0] = '\0';
               }
               else
               {
                  /*
                   * That's not ok (and even more stupid)
                   */
                  assert(ival >= 0);
                  format_string = "[counted string lenght < 0]";
               }
            }
            else if ((size_t)ival >= sizeof(tempbuf))
            {
               /*
                * String is too long, copy as much as possible.
                * It will be further truncated later.
                */
               memcpy(tempbuf, sval, sizeof(tempbuf)-1);
               tempbuf[sizeof(tempbuf)-1] = '\0';
            }
            else
            {
               memcpy(tempbuf, sval, (size_t) ival);
               tempbuf[ival] = '\0';
            }
            break;
         case 'E':
            /* Non-standard: Print error code from errno */
#ifdef _WIN32
            ival = WSAGetLastError();
            format_string = w32_socket_strerr(ival, tempbuf);
#elif __OS2__
            ival = sock_errno();
            if (ival != 0)
            {
               format_string = os2_socket_strerr(ival, tempbuf);
            }
            else
            {
               ival = errno;
               format_string = strerror(ival);
            }
#else /* ifndef _WIN32 */
            ival = errno; 
#ifdef HAVE_STRERROR
            format_string = strerror(ival);
#else /* ifndef HAVE_STRERROR */
            format_string = NULL;
#endif /* ndef HAVE_STRERROR */
            if (sval == NULL)
            {
               snprintf(tempbuf, sizeof(tempbuf), "(errno = %d)", ival);
            }
#endif /* ndef _WIN32 */
            break;
         case 'T':
            /* Non-standard: Print a Common Log File timestamp */
            get_clf_timestamp(tempbuf, sizeof(tempbuf));
            break;
         default:
            snprintf(tempbuf, sizeof(tempbuf), "Bad format string: \"%s\"", fmt);
            loglevel = LOG_LEVEL_FATAL;
            break;
      } /* switch( p ) */

      assert(length < log_buffer_size);
      length += strlcpy(outbuf + length, format_string, log_buffer_size - length);

      if (length >= log_buffer_size-2)
      {
         static char warning[] = "... [too long, truncated]";

         length = log_buffer_size - sizeof(warning) - 1;
         length += strlcpy(outbuf + length, warning, log_buffer_size - length);
         assert(length < log_buffer_size);

         break;
      }
   } /* for( p ... ) */

   /* done with var. args */
   va_end(ap);

   assert(length < log_buffer_size);
   length += strlcpy(outbuf + length, "\n", log_buffer_size - length);

   /* Some sanity checks */
   if ((length >= log_buffer_size)
    || (outbuf[log_buffer_size-1] != '\0')
    || (outbuf[log_buffer_size] != '\0')
      )
   {
      /* Repeat as assertions */
      assert(length < log_buffer_size);
      assert(outbuf[log_buffer_size-1] == '\0');
      /*
       * outbuf's real size is log_buffer_size+1,
       * so while this looks like an off-by-one,
       * we're only checking our paranoia byte.
       */
      assert(outbuf[log_buffer_size] == '\0');

      snprintf(outbuf, log_buffer_size,
         "%s %08lx Fatal error: log_error()'s sanity checks failed."
         "length: %d. Exiting.",
         timestamp, thread_id, (int)length);
      loglevel = LOG_LEVEL_FATAL;
   }

#ifndef _WIN32
   /*
    * On Windows this is acceptable in case
    * we are logging to the GUI window only.
    */
   assert(NULL != logfp);
#endif

   if (loglevel == LOG_LEVEL_FATAL)
   {
      fatal_error(outbuf_save);
      /* Never get here */
   }
   if (logfp != NULL)
   {
      fputs(outbuf_save, logfp);
   }

#if defined(_WIN32) && !defined(_WIN_CONSOLE)
   /* Write to display */
   LogPutString(outbuf_save);
#endif /* defined(_WIN32) && !defined(_WIN_CONSOLE) */

   unlock_logfile();

}


/*********************************************************************
 *
 * Function    :  jb_err_to_string
 *
 * Description :  Translates JB_ERR_FOO codes into strings.
 *
 *                XXX: the type of error codes is jb_err
 *                but the typedef'inition is currently not
 *                visible to all files that include errlog.h.
 *
 * Parameters  :
 *          1  :  error = a valid jb_err code
 *
 * Returns     :  A string with the jb_err translation
 *
 *********************************************************************/
const char *jb_err_to_string(int error)
{
   switch (error)
   {
      case JB_ERR_OK:
         return "Success, no error";
      case JB_ERR_MEMORY:
         return "Out of memory";
      case JB_ERR_CGI_PARAMS:
         return "Missing or corrupt CGI parameters";
      case JB_ERR_FILE:
         return "Error opening, reading or writing a file";
      case JB_ERR_PARSE:
         return "Parse error";
      case JB_ERR_MODIFIED:
         return "File has been modified outside of the CGI actions editor.";
      case JB_ERR_COMPRESS:
         return "(De)compression failure";
      default:
         assert(0);
         return "Unknown error";
   }
   assert(0);
   return "Internal error";
}

#ifdef _WIN32
/*********************************************************************
 *
 * Function    :  w32_socket_strerr
 *
 * Description :  Translate the return value from WSAGetLastError()
 *                into a string.
 *
 * Parameters  :
 *          1  :  errcode = The return value from WSAGetLastError().
 *          2  :  tmp_buf = A temporary buffer that might be used to
 *                          store the string.
 *
 * Returns     :  String representing the error code.  This may be
 *                a global string constant or a string stored in
 *                tmp_buf.
 *
 *********************************************************************/
static char *w32_socket_strerr(int errcode, char *tmp_buf)
{
#define TEXT_FOR_ERROR(code,text) \
   if (errcode == code)           \
   {                              \
      return #code " - " text;    \
   }

   TEXT_FOR_ERROR(WSAEACCES, "Permission denied")
   TEXT_FOR_ERROR(WSAEADDRINUSE, "Address already in use.")
   TEXT_FOR_ERROR(WSAEADDRNOTAVAIL, "Cannot assign requested address.");
   TEXT_FOR_ERROR(WSAEAFNOSUPPORT, "Address family not supported by protocol family.");
   TEXT_FOR_ERROR(WSAEALREADY, "Operation already in progress.");
   TEXT_FOR_ERROR(WSAECONNABORTED, "Software caused connection abort.");
   TEXT_FOR_ERROR(WSAECONNREFUSED, "Connection refused.");
   TEXT_FOR_ERROR(WSAECONNRESET, "Connection reset by peer.");
   TEXT_FOR_ERROR(WSAEDESTADDRREQ, "Destination address required.");
   TEXT_FOR_ERROR(WSAEFAULT, "Bad address.");
   TEXT_FOR_ERROR(WSAEHOSTDOWN, "Host is down.");
   TEXT_FOR_ERROR(WSAEHOSTUNREACH, "No route to host.");
   TEXT_FOR_ERROR(WSAEINPROGRESS, "Operation now in progress.");
   TEXT_FOR_ERROR(WSAEINTR, "Interrupted function call.");
   TEXT_FOR_ERROR(WSAEINVAL, "Invalid argument.");
   TEXT_FOR_ERROR(WSAEISCONN, "Socket is already connected.");
   TEXT_FOR_ERROR(WSAEMFILE, "Too many open sockets.");
   TEXT_FOR_ERROR(WSAEMSGSIZE, "Message too long.");
   TEXT_FOR_ERROR(WSAENETDOWN, "Network is down.");
   TEXT_FOR_ERROR(WSAENETRESET, "Network dropped connection on reset.");
   TEXT_FOR_ERROR(WSAENETUNREACH, "Network is unreachable.");
   TEXT_FOR_ERROR(WSAENOBUFS, "No buffer space available.");
   TEXT_FOR_ERROR(WSAENOPROTOOPT, "Bad protocol option.");
   TEXT_FOR_ERROR(WSAENOTCONN, "Socket is not connected.");
   TEXT_FOR_ERROR(WSAENOTSOCK, "Socket operation on non-socket.");
   TEXT_FOR_ERROR(WSAEOPNOTSUPP, "Operation not supported.");
   TEXT_FOR_ERROR(WSAEPFNOSUPPORT, "Protocol family not supported.");
   TEXT_FOR_ERROR(WSAEPROCLIM, "Too many processes.");
   TEXT_FOR_ERROR(WSAEPROTONOSUPPORT, "Protocol not supported.");
   TEXT_FOR_ERROR(WSAEPROTOTYPE, "Protocol wrong type for socket.");
   TEXT_FOR_ERROR(WSAESHUTDOWN, "Cannot send after socket shutdown.");
   TEXT_FOR_ERROR(WSAESOCKTNOSUPPORT, "Socket type not supported.");
   TEXT_FOR_ERROR(WSAETIMEDOUT, "Connection timed out.");
   TEXT_FOR_ERROR(WSAEWOULDBLOCK, "Resource temporarily unavailable.");
   TEXT_FOR_ERROR(WSAHOST_NOT_FOUND, "Host not found.");
   TEXT_FOR_ERROR(WSANOTINITIALISED, "Successful WSAStartup not yet performed.");
   TEXT_FOR_ERROR(WSANO_DATA, "Valid name, no data record of requested type.");
   TEXT_FOR_ERROR(WSANO_RECOVERY, "This is a non-recoverable error.");
   TEXT_FOR_ERROR(WSASYSNOTREADY, "Network subsystem is unavailable.");
   TEXT_FOR_ERROR(WSATRY_AGAIN, "Non-authoritative host not found.");
   TEXT_FOR_ERROR(WSAVERNOTSUPPORTED, "WINSOCK.DLL version out of range.");
   TEXT_FOR_ERROR(WSAEDISCON, "Graceful shutdown in progress.");
   /*
    * The following error codes are documented in the Microsoft WinSock
    * reference guide, but don't actually exist.
    *
    * TEXT_FOR_ERROR(WSA_INVALID_HANDLE, "Specified event object handle is invalid.");
    * TEXT_FOR_ERROR(WSA_INVALID_PARAMETER, "One or more parameters are invalid.");
    * TEXT_FOR_ERROR(WSAINVALIDPROCTABLE, "Invalid procedure table from service provider.");
    * TEXT_FOR_ERROR(WSAINVALIDPROVIDER, "Invalid service provider version number.");
    * TEXT_FOR_ERROR(WSA_IO_PENDING, "Overlapped operations will complete later.");
    * TEXT_FOR_ERROR(WSA_IO_INCOMPLETE, "Overlapped I/O event object not in signaled state.");
    * TEXT_FOR_ERROR(WSA_NOT_ENOUGH_MEMORY, "Insufficient memory available.");
    * TEXT_FOR_ERROR(WSAPROVIDERFAILEDINIT, "Unable to initialize a service provider.");
    * TEXT_FOR_ERROR(WSASYSCALLFAILURE, "System call failure.");
    * TEXT_FOR_ERROR(WSA_OPERATION_ABORTED, "Overlapped operation aborted.");
    */

   sprintf(tmp_buf, "(error number %d)", errcode);
   return tmp_buf;
}
#endif /* def _WIN32 */


#ifdef __OS2__
/*********************************************************************
 *
 * Function    :  os2_socket_strerr
 *
 * Description :  Translate the return value from sock_errno()
 *                into a string.
 *
 * Parameters  :
 *          1  :  errcode = The return value from sock_errno().
 *          2  :  tmp_buf = A temporary buffer that might be used to
 *                          store the string.
 *
 * Returns     :  String representing the error code.  This may be
 *                a global string constant or a string stored in
 *                tmp_buf.
 *
 *********************************************************************/
static char *os2_socket_strerr(int errcode, char *tmp_buf)
{
#define TEXT_FOR_ERROR(code,text) \
   if (errcode == code)           \
   {                              \
      return #code " - " text;    \
   }

   TEXT_FOR_ERROR(SOCEPERM          , "Not owner.")
   TEXT_FOR_ERROR(SOCESRCH          , "No such process.")
   TEXT_FOR_ERROR(SOCEINTR          , "Interrupted system call.")
   TEXT_FOR_ERROR(SOCENXIO          , "No such device or address.")
   TEXT_FOR_ERROR(SOCEBADF          , "Bad file number.")
   TEXT_FOR_ERROR(SOCEACCES         , "Permission denied.")
   TEXT_FOR_ERROR(SOCEFAULT         , "Bad address.")
   TEXT_FOR_ERROR(SOCEINVAL         , "Invalid argument.")
   TEXT_FOR_ERROR(SOCEMFILE         , "Too many open files.")
   TEXT_FOR_ERROR(SOCEPIPE          , "Broken pipe.")
   TEXT_FOR_ERROR(SOCEWOULDBLOCK    , "Operation would block.")
   TEXT_FOR_ERROR(SOCEINPROGRESS    , "Operation now in progress.")
   TEXT_FOR_ERROR(SOCEALREADY       , "Operation already in progress.")
   TEXT_FOR_ERROR(SOCENOTSOCK       , "Socket operation on non-socket.")
   TEXT_FOR_ERROR(SOCEDESTADDRREQ   , "Destination address required.")
   TEXT_FOR_ERROR(SOCEMSGSIZE       , "Message too long.")
   TEXT_FOR_ERROR(SOCEPROTOTYPE     , "Protocol wrong type for socket.")
   TEXT_FOR_ERROR(SOCENOPROTOOPT    , "Protocol not available.")
   TEXT_FOR_ERROR(SOCEPROTONOSUPPORT, "Protocol not supported.")
   TEXT_FOR_ERROR(SOCESOCKTNOSUPPORT, "Socket type not supported.")
   TEXT_FOR_ERROR(SOCEOPNOTSUPP     , "Operation not supported.")
   TEXT_FOR_ERROR(SOCEPFNOSUPPORT   , "Protocol family not supported.")
   TEXT_FOR_ERROR(SOCEAFNOSUPPORT   , "Address family not supported by protocol family.")
   TEXT_FOR_ERROR(SOCEADDRINUSE     , "Address already in use.")
   TEXT_FOR_ERROR(SOCEADDRNOTAVAIL  , "Can't assign requested address.")
   TEXT_FOR_ERROR(SOCENETDOWN       , "Network is down.")
   TEXT_FOR_ERROR(SOCENETUNREACH    , "Network is unreachable.")
   TEXT_FOR_ERROR(SOCENETRESET      , "Network dropped connection on reset.")
   TEXT_FOR_ERROR(SOCECONNABORTED   , "Software caused connection abort.")
   TEXT_FOR_ERROR(SOCECONNRESET     , "Connection reset by peer.")
   TEXT_FOR_ERROR(SOCENOBUFS        , "No buffer space available.")
   TEXT_FOR_ERROR(SOCEISCONN        , "Socket is already connected.")
   TEXT_FOR_ERROR(SOCENOTCONN       , "Socket is not connected.")
   TEXT_FOR_ERROR(SOCESHUTDOWN      , "Can't send after socket shutdown.")
   TEXT_FOR_ERROR(SOCETOOMANYREFS   , "Too many references: can't splice.")
   TEXT_FOR_ERROR(SOCETIMEDOUT      , "Operation timed out.")
   TEXT_FOR_ERROR(SOCECONNREFUSED   , "Connection refused.")
   TEXT_FOR_ERROR(SOCELOOP          , "Too many levels of symbolic links.")
   TEXT_FOR_ERROR(SOCENAMETOOLONG   , "File name too long.")
   TEXT_FOR_ERROR(SOCEHOSTDOWN      , "Host is down.")
   TEXT_FOR_ERROR(SOCEHOSTUNREACH   , "No route to host.")
   TEXT_FOR_ERROR(SOCENOTEMPTY      , "Directory not empty.")
   TEXT_FOR_ERROR(SOCEOS2ERR        , "OS/2 Error.")

   sprintf(tmp_buf, "(error number %d)", errcode);
   return tmp_buf;
}
#endif /* def __OS2__ */


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