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rf_debugprint.c revision 1.3 
      1 /*	$NetBSD: rf_debugprint.c,v 1.3 1999/02/05 00:06:08 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 /* space for 1k lines */
     49 #define BUFSHIFT 10
     50 #define BUFSIZE  (1<<BUFSHIFT)
     51 #define BUFMASK  (BUFSIZE-1)
     52 
     53 static struct RF_Entry_s rf_debugprint_buf[BUFSIZE];
     54 static int rf_debugprint_index = 0;
     55 RF_DECLARE_STATIC_MUTEX(rf_debug_print_mutex)
     56 	int     rf_ConfigureDebugPrint(listp)
     57 	RF_ShutdownList_t **listp;
     58 {
     59 	int     rc;
     60 
     61 	rc = rf_create_managed_mutex(listp, &rf_debug_print_mutex);
     62 	if (rc) {
     63 		RF_ERRORMSG3("Unable to init mutex file %s line %d rc=%d\n", __FILE__,
     64 		    __LINE__, rc);
     65 		return (rc);
     66 	}
     67 	rf_clear_debug_print_buffer();
     68 	return (0);
     69 }
     70 
     71 void
     72 rf_clear_debug_print_buffer()
     73 {
     74 	int     i;
     75 
     76 	for (i = 0; i < BUFSIZE; i++)
     77 		rf_debugprint_buf[i].cstring = NULL;
     78 	rf_debugprint_index = 0;
     79 }
     80 
     81 void
     82 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 	} else {
    105 		printf(s, a1, a2, a3, a4, a5, a6, a7, a8);
    106 	}
    107 }
    108 
    109 void
    110 rf_print_debug_buffer()
    111 {
    112 	rf_spill_debug_buffer(NULL);
    113 }
    114 
    115 void
    116 rf_spill_debug_buffer(fname)
    117 	char   *fname;
    118 {
    119 	int     i;
    120 
    121 	if (!rf_debugPrintUseBuffer)
    122 		return;
    123 
    124 	RF_LOCK_MUTEX(rf_debug_print_mutex);
    125 
    126 	for (i = rf_debugprint_index + 1; i != rf_debugprint_index; i = (i + 1) & BUFMASK)
    127 		if (rf_debugprint_buf[i].cstring)
    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 	printf(rf_debugprint_buf[i].cstring, rf_debugprint_buf[i].a1, rf_debugprint_buf[i].a2, rf_debugprint_buf[i].a3,
    131 	    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);
    132 	RF_UNLOCK_MUTEX(rf_debug_print_mutex);
    133 }
    134