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 /*----- Revision history --------------------------------------------------*
  30  *
  31  * $Log: err.c,v $
  32  * Revision 1.2  2002/02/02 19:16:46  mdw
  33  * New audio subsystem.
  34  *
  35  * Revision 1.1  2002/01/25 19:34:45  mdw
  36  * Initial revision
  37  *
  38  */
  39
  40 /*----- Header files ------------------------------------------------------*/
  41
  42 #ifdef HAVE_CONFIG_H
  43 #  include "config.h"
  44 #endif
  45
  46 #include <errno.h>
  47 #include <stdarg.h>
  48 #include <stdio.h>
  49 #include <stdlib.h>
  50 #include <string.h>
  51 #include <time.h>
  52
  53 #include <mLib/exc.h>
  54 #include <mLib/quis.h>
  55
  56 #include "auerr.h"
  57 #include "err.h"
  58
  59 /*----- Static variables --------------------------------------------------*/
  60
  61 static FILE *logfp = 0;
  62 static unsigned flags = 0;
  63
  64 #define f_thread 1u
  65
  66 /*----- Main code ---------------------------------------------------------*/
  67
  68 /* --- @err_abort@ --- *
  69  *
  70  * Arguments:   @int reason@ = abort reason code
  71  *              @unsigned long err@ = abort error code
  72  *              @const char *msg@ = error message
  73  *
  74  * Returns:     Doesn't.
  75  *
  76  * Use:         Reports a fatal error.
  77  */
  78
  79 void err_abortv(int reason, unsigned long err, const char *msg, va_list *ap)
  80 {
  81   fprintf(stderr, "%s: fatal error (code %d-%lu): ", QUIS, reason, err);
  82   vfprintf(stderr, msg, *ap);
  83   putc('\n', stderr);
  84   auerr_abort(reason, err);
  85   abort();
  86 }
  87
  88 void err_abort(int reason, unsigned long err, const char *msg, ...)
  89 {
  90   va_list ap;
  91
  92   va_start(ap, msg);
  93   err_abortv(reason, err, msg, &ap);
  94   va_end(ap);
  95 }
  96
  97 /* --- @err_init@ --- *
  98  *
  99  * Arguments:   ---
 100  *
 101  * Returns:     ---
 102  *
 103  * Use:         Attempts to initialize the logging system.  It is a
 104  *              catastrophic failure if logging can't start up.
 105  */
 106
 107 static void err_exc(exc_extype ex, exc_exval v)
 108 {
 109   switch (ex) {
 110     case EXC_NOMEM:
 111       err_report(ERR_EXC, 0, ex, "out of memory");
 112       break;
 113     default:
 114       err_report(ERR_EXC, 0, ex, "uncaught mLib exception");
 115       break;
 116   }
 117   exit(EXIT_FAILURE);
 118 }
 119
 120 void err_init(void)
 121 {
 122   const char *lf;
 123
 124   lf = getenv("JOG_LOGFILE");
 125   if (!lf)
 126     logfp = stderr;
 127   else if ((logfp = fopen(lf, "w")) == 0) {
 128     err_abort(ERRABORT_LOGOPEN, errno,
 129               "couldn't open logfile `%s': %s", lf, strerror(errno));
 130   }
 131   exc_uncaught(err_exc);
 132 }
 133
 134 /* --- @err_report@ --- *
 135  *
 136  * Arguments:   @int ctx@ = context code
 137  *              @int reason@ = reason code
 138  *              @unsigned long err@ = system error code
 139  *              @const char *msg@ = textual message to log
 140  *
 141  * Returns:     ---
 142  *
 143  * Use:         Reports an error.  Doesn't abort anything unless something
 144  *              really serious happens.
 145  */
 146
 147 void err_reportv(int ctx, int reason, unsigned long err,
 148                  const char *msg, va_list *ap)
 149 {
 150   char buf[256];
 151   time_t t;
 152   struct tm *tm;
 153
 154   if (ctx && !(flags & f_thread)) {
 155     unsigned f = flags;
 156     flags |= f_thread;
 157     auerr(ctx, reason, err);
 158     flags = f;
 159   }
 160   t = time(0);
 161   tm = localtime(&t);
 162   strftime(buf, sizeof(buf), "%Y-%m-%d %H:%M:%S", tm);
 163   if (fputs(buf, logfp) == EOF ||
 164       fprintf(stderr, " %s: ", QUIS) == EOF ||
 165       vfprintf(logfp, msg, *ap) == EOF ||
 166       (ctx && (fprintf(logfp, " (error %d", ctx) == EOF ||
 167                (reason && fprintf(logfp, "-%d", reason) == EOF) ||
 168                (err && fprintf(logfp, ":%lu", err) == EOF) ||
 169                putc(')', logfp) == EOF)) ||
 170       putc('\n', logfp) == EOF ||
 171       fflush(logfp) == EOF) {
 172     err_abort(ERRABORT_LOGWRITE, errno,
 173               "error writing logfile: %s", strerror(errno));
 174   }
 175 }
 176
 177 void err_report(int ctx, int reason, unsigned long err, const char *msg, ...)
 178 {
 179   va_list ap;
 180
 181   va_start(ap, msg);
 182   err_reportv(ctx, reason, err, msg, &ap);
 183   va_end(ap);
 184 }
 185
 186 /* --- @err_log@ --- *
 187  *
 188  * Arguments:    @const char *msg@ = textual message to log
 189  *
 190  * Returns:     ---
 191  *
 192  * Use:         Logs a message.
 193  */
 194
 195 void err_logv(const char *msg, va_list *ap)
 196 {
 197   err_reportv(0, 0, 0, msg, ap);
 198 }
 199
 200 void err_log(const char *msg, ...)
 201 {
 202   va_list ap;
 203
 204   va_start(ap, msg);
 205   err_reportv(0, 0, 0, msg, &ap);
 206   va_end(ap);
 207 }
 208
 209 /*----- That's all, folks -------------------------------------------------*/