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rf_debugprint.c revision 1.2 
      1 /*	$NetBSD: rf_debugprint.c,v 1.2 1999/01/26 02:33:54 oster Exp $	*/
      2 /*
      3  * Copyright (c) 1995 Carnegie-Mellon University.
      4  * All rights reserved.
      5  *
      6  * Author: Mark Holland
      7  *
      8  * Permission to use, copy, modify and distribute this software and
      9  * its documentation is hereby granted, provided that both the copyright
     10  * notice and this permission notice appear in all copies of the
     11  * software, derivative works or modified versions, and any portions
     12  * thereof, and that both notices appear in supporting documentation.
     13  *
     14  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
     15  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
     16  * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
     17  *
     18  * Carnegie Mellon requests users of this software to return to
     19  *
     20  *  Software Distribution Coordinator  or  Software.Distribution (at) CS.CMU.EDU
     21  *  School of Computer Science
     22  *  Carnegie Mellon University
     23  *  Pittsburgh PA 15213-3890
     24  *
     25  * any improvements or extensions that they make and grant Carnegie the
     26  * rights to redistribute these changes.
     27  */
     28 
     29 /*
     30  * Code to do debug printfs. Calls to rf_debug_printf cause the corresponding
     31  * information to be printed to a circular buffer rather than the screen.
     32  * The point is to try and minimize the timing variations induced by the
     33  * printfs, and to capture only the printf's immediately preceding a failure.
     34  */
     35 
     36 #include "rf_types.h"
     37 #include "rf_threadstuff.h"
     38 #include "rf_debugprint.h"
     39 #include "rf_general.h"
     40 #include "rf_options.h"
     41 
     42 #include <sys/param.h>
     43 
     44 struct RF_Entry_s {
     45    char *cstring;
     46    void *a1, *a2, *a3, *a4, *a5, *a6, *a7, *a8;
     47 };
     48 
     49 /* space for 1k lines */
     50 #define BUFSHIFT 10
     51 #define BUFSIZE  (1<<BUFSHIFT)
     52 #define BUFMASK  (BUFSIZE-1)
     53 
     54 static struct RF_Entry_s rf_debugprint_buf[BUFSIZE];
     55 static int rf_debugprint_index = 0;
     56 RF_DECLARE_STATIC_MUTEX(rf_debug_print_mutex)
     57 
     58 int rf_ConfigureDebugPrint(listp)
     59   RF_ShutdownList_t  **listp;
     60 {
     61   int rc;
     62 
     63   rc = rf_create_managed_mutex(listp, &rf_debug_print_mutex);
     64   if (rc) {
     65     RF_ERRORMSG3("Unable to init mutex file %s line %d rc=%d\n", __FILE__,
     66       __LINE__, rc);
     67     return(rc);
     68   }
     69   rf_clear_debug_print_buffer();
     70   return(0);
     71 }
     72 
     73 void rf_clear_debug_print_buffer()
     74 {
     75   int i;
     76 
     77   for (i=0; i<BUFSIZE; i++)
     78     rf_debugprint_buf[i].cstring = NULL;
     79   rf_debugprint_index = 0;
     80 }
     81 
     82 void rf_debug_printf(s,a1,a2,a3,a4,a5,a6,a7,a8)
     83 char *s;
     84 void *a1,*a2,*a3,*a4,*a5,*a6,*a7,*a8;
     85 {
     86   int idx;
     87 
     88   if (rf_debugPrintUseBuffer) {
     89 
     90     RF_LOCK_MUTEX(rf_debug_print_mutex);
     91     idx = rf_debugprint_index;
     92     rf_debugprint_index = (rf_debugprint_index+1) & BUFMASK;
     93     RF_UNLOCK_MUTEX(rf_debug_print_mutex);
     94 
     95     rf_debugprint_buf[idx].cstring = s;
     96     rf_debugprint_buf[idx].a1 = a1;
     97     rf_debugprint_buf[idx].a2 = a2;
     98     rf_debugprint_buf[idx].a3 = a3;
     99     rf_debugprint_buf[idx].a4 = a4;
    100     rf_debugprint_buf[idx].a5 = a5;
    101     rf_debugprint_buf[idx].a6 = a6;
    102     rf_debugprint_buf[idx].a7 = a7;
    103     rf_debugprint_buf[idx].a8 = a8;
    104   }
    105   else {
    106     printf(s,a1,a2,a3,a4,a5,a6,a7,a8);
    107   }
    108 }
    109 
    110 void rf_print_debug_buffer()
    111 {
    112   rf_spill_debug_buffer(NULL);
    113 }
    114 
    115 void rf_spill_debug_buffer(fname)
    116   char  *fname;
    117 {
    118   int i;
    119 
    120   if (!rf_debugPrintUseBuffer)
    121     return;
    122 
    123   RF_LOCK_MUTEX(rf_debug_print_mutex);
    124 
    125   for (i=rf_debugprint_index+1; i != rf_debugprint_index; i = (i+1)&BUFMASK) if (rf_debugprint_buf[i].cstring)
    126     printf(rf_debugprint_buf[i].cstring,rf_debugprint_buf[i].a1,rf_debugprint_buf[i].a2,rf_debugprint_buf[i].a3,
    127 	   rf_debugprint_buf[i].a4,rf_debugprint_buf[i].a5,rf_debugprint_buf[i].a6,rf_debugprint_buf[i].a7,rf_debugprint_buf[i].a8);
    128   printf(rf_debugprint_buf[i].cstring,rf_debugprint_buf[i].a1,rf_debugprint_buf[i].a2,rf_debugprint_buf[i].a3,
    129 	 rf_debugprint_buf[i].a4,rf_debugprint_buf[i].a5,rf_debugprint_buf[i].a6,rf_debugprint_buf[i].a7,rf_debugprint_buf[i].a8);
    130   RF_UNLOCK_MUTEX(rf_debug_print_mutex);
    131 }
    132