mdw@git.distorted.org.uk Git - jog/blob - err.c

   1 /* -*-c-*-
   2  *
   3  * $Id: err.c,v 1.2 2002/02/02 19:16:46 mdw Exp $
   4  *
   5  * Error reporting
   6  *
   7  * (c) 2001 Mark Wooding
   8  */
   9
  10 /*----- Licensing notice --------------------------------------------------*
  11  *
  12  * This file is part of Jog: Programming for a jogging machine.
  13  *
  14  * Jog is free software; you can redistribute it and/or modify
  15  * it under the terms of the GNU General Public License as published by
  16  * the Free Software Foundation; either version 2 of the License, or
  17  * (at your option) any later version.
  18  *
  19  * Jog is distributed in the hope that it will be useful,
  20  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  21  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  22  * GNU General Public License for more details.
  23  *
  24  * You should have received a copy of the GNU General Public License
  25  * along with Jog; if not, write to the Free Software Foundation,
  26  * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  27  */
  28
  29 /*----- Header files ------------------------------------------------------*/
  30
  31 #ifdef HAVE_CONFIG_H
  32 #  include "config.h"
  33 #endif
  34
  35 #include <errno.h>
  36 #include <stdarg.h>
  37 #include <stdio.h>
  38 #include <stdlib.h>
  39 #include <string.h>
  40 #include <time.h>
  41
  42 #include <mLib/exc.h>
  43 #include <mLib/quis.h>
  44
  45 #include "auerr.h"
  46 #include "err.h"
  47
  48 /*----- Static variables --------------------------------------------------*/
  49
  50 static FILE *logfp = 0;
  51 static unsigned flags = 0;
  52
  53 #define f_thread 1u
  54
  55 /*----- Main code ---------------------------------------------------------*/
  56
  57 /* --- @err_abort@ --- *
  58  *
  59  * Arguments:   @int reason@ = abort reason code
  60  *              @unsigned long err@ = abort error code
  61  *              @const char *msg@ = error message
  62  *
  63  * Returns:     Doesn't.
  64  *
  65  * Use:         Reports a fatal error.
  66  */
  67
  68 void err_abortv(int reason, unsigned long err, const char *msg, va_list *ap)
  69 {
  70   fprintf(stderr, "%s: fatal error (code %d-%lu): ", QUIS, reason, err);
  71   vfprintf(stderr, msg, *ap);
  72   putc('\n', stderr);
  73   auerr_abort(reason, err);
  74   abort();
  75 }
  76
  77 void err_abort(int reason, unsigned long err, const char *msg, ...)
  78 {
  79   va_list ap;
  80
  81   va_start(ap, msg);
  82   err_abortv(reason, err, msg, &ap);
  83   va_end(ap);
  84 }
  85
  86 /* --- @err_init@ --- *
  87  *
  88  * Arguments:   ---
  89  *
  90  * Returns:     ---
  91  *
  92  * Use:         Attempts to initialize the logging system.  It is a
  93  *              catastrophic failure if logging can't start up.
  94  */
  95
  96 static void err_exc(exc_extype ex, exc_exval v)
  97 {
  98   switch (ex) {
  99     case EXC_NOMEM:
 100       err_report(ERR_EXC, 0, ex, "out of memory");
 101       break;
 102     default:
 103       err_report(ERR_EXC, 0, ex, "uncaught mLib exception");
 104       break;
 105   }
 106   exit(EXIT_FAILURE);
 107 }
 108
 109 void err_init(void)
 110 {
 111   const char *lf;
 112
 113   lf = getenv("JOG_LOGFILE");
 114   if (!lf)
 115     logfp = stderr;
 116   else if ((logfp = fopen(lf, "w")) == 0) {
 117     err_abort(ERRABORT_LOGOPEN, errno,
 118               "couldn't open logfile `%s': %s", lf, strerror(errno));
 119   }
 120   exc_uncaught(err_exc);
 121 }
 122
 123 /* --- @err_report@ --- *
 124  *
 125  * Arguments:   @int ctx@ = context code
 126  *              @int reason@ = reason code
 127  *              @unsigned long err@ = system error code
 128  *              @const char *msg@ = textual message to log
 129  *
 130  * Returns:     ---
 131  *
 132  * Use:         Reports an error.  Doesn't abort anything unless something
 133  *              really serious happens.
 134  */
 135
 136 void err_reportv(int ctx, int reason, unsigned long err,
 137                  const char *msg, va_list *ap)
 138 {
 139   char buf[256];
 140   time_t t;
 141   struct tm *tm;
 142
 143   if (ctx && !(flags & f_thread)) {
 144     unsigned f = flags;
 145     flags |= f_thread;
 146     auerr(ctx, reason, err);
 147     flags = f;
 148   }
 149   t = time(0);
 150   tm = localtime(&t);
 151   strftime(buf, sizeof(buf), "%Y-%m-%d %H:%M:%S", tm);
 152   if (fputs(buf, logfp) == EOF ||
 153       fprintf(stderr, " %s: ", QUIS) == EOF ||
 154       vfprintf(logfp, msg, *ap) == EOF ||
 155       (ctx && (fprintf(logfp, " (error %d", ctx) == EOF ||
 156                (reason && fprintf(logfp, "-%d", reason) == EOF) ||
 157                (err && fprintf(logfp, ":%lu", err) == EOF) ||
 158                putc(')', logfp) == EOF)) ||
 159       putc('\n', logfp) == EOF ||
 160       fflush(logfp) == EOF) {
 161     err_abort(ERRABORT_LOGWRITE, errno,
 162               "error writing logfile: %s", strerror(errno));
 163   }
 164 }
 165
 166 void err_report(int ctx, int reason, unsigned long err, const char *msg, ...)
 167 {
 168   va_list ap;
 169
 170   va_start(ap, msg);
 171   err_reportv(ctx, reason, err, msg, &ap);
 172   va_end(ap);
 173 }
 174
 175 /* --- @err_log@ --- *
 176  *
 177  * Arguments:    @const char *msg@ = textual message to log
 178  *
 179  * Returns:     ---
 180  *
 181  * Use:         Logs a message.
 182  */
 183
 184 void err_logv(const char *msg, va_list *ap)
 185 {
 186   err_reportv(0, 0, 0, msg, ap);
 187 }
 188
 189 void err_log(const char *msg, ...)
 190 {
 191   va_list ap;
 192
 193   va_start(ap, msg);
 194   err_reportv(0, 0, 0, msg, &ap);
 195   va_end(ap);
 196 }
 197
 198 /*----- That's all, folks -------------------------------------------------*/