granicus.if.org Git - strace/blob - count.c

   1 /*
   2  * Copyright (c) 1991, 1992 Paul Kranenburg <pk@cs.few.eur.nl>
   3  * Copyright (c) 1993 Branko Lankester <branko@hacktic.nl>
   4  * Copyright (c) 1993, 1994, 1995, 1996 Rick Sladkey <jrs@world.std.com>
   5  * Copyright (c) 1996-1999 Wichert Akkerman <wichert@cistron.nl>
   6  * Copyright (c) 1999 IBM Deutschland Entwicklung GmbH, IBM Corporation
   7  *                     Linux for s390 port by D.J. Barrow
   8  *                    <barrow_dj@mail.yahoo.com,djbarrow@de.ibm.com>
   9  * Copyright (c) 2004 Roland McGrath <roland@redhat.com>
  10  * Copyright (c) 2006 Dmitry V. Levin <ldv@altlinux.org>
  11  * All rights reserved.
  12  *
  13  * Redistribution and use in source and binary forms, with or without
  14  * modification, are permitted provided that the following conditions
  15  * are met:
  16  * 1. Redistributions of source code must retain the above copyright
  17  *    notice, this list of conditions and the following disclaimer.
  18  * 2. Redistributions in binary form must reproduce the above copyright
  19  *    notice, this list of conditions and the following disclaimer in the
  20  *    documentation and/or other materials provided with the distribution.
  21  * 3. The name of the author may not be used to endorse or promote products
  22  *    derived from this software without specific prior written permission.
  23  *
  24  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  25  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  26  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  27  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  28  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  29  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  30  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  31  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  32  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  33  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  34  *
  35  *      $Id$
  36  */
  37
  38 #include "defs.h"
  39
  40 struct call_counts {
  41         struct timeval time;
  42         int calls, errors;
  43 };
  44
  45 static struct call_counts *countv[SUPPORTED_PERSONALITIES];
  46 #define counts (countv[current_personality])
  47
  48 static struct timeval shortest = { 1000000, 0 };
  49
  50 int
  51 count_syscall(struct tcb *tcp, struct timeval *tv)
  52 {
  53         if (tcp->scno < 0 || tcp->scno >= nsyscalls)
  54                 return 0;
  55
  56         if (!counts) {
  57                 counts = calloc(nsyscalls, sizeof(*counts));
  58                 if (!counts) {
  59                         fprintf(stderr,
  60                                 "strace: out of memory for call counts\n");
  61                         exit(1);
  62                 }
  63         }
  64
  65         counts[tcp->scno].calls++;
  66         if (tcp->u_error)
  67                 counts[tcp->scno].errors++;
  68
  69         tv_sub(tv, tv, &tcp->etime);
  70 #ifdef LINUX
  71         if (tv_cmp(tv, &tcp->dtime) > 0) {
  72                 static struct timeval one_tick;
  73
  74                 if (one_tick.tv_usec == 0) {
  75                         /* Initialize it.  */
  76                         struct itimerval it;
  77
  78                         memset(&it, 0, sizeof it);
  79                         it.it_interval.tv_usec = 1;
  80                         setitimer(ITIMER_REAL, &it, NULL);
  81                         getitimer(ITIMER_REAL, &it);
  82                         one_tick = it.it_interval;
  83                 }
  84
  85                 if (tv_nz(&tcp->dtime))
  86                         *tv = tcp->dtime;
  87                 else if (tv_cmp(tv, &one_tick) > 0) {
  88                         if (tv_cmp(&shortest, &one_tick) < 0)
  89                                 *tv = shortest;
  90                         else
  91                                 *tv = one_tick;
  92                 }
  93         }
  94 #endif /* LINUX */
  95         if (tv_cmp(tv, &shortest) < 0)
  96                 shortest = *tv;
  97         tv_add(&counts[tcp->scno].time, &counts[tcp->scno].time, tv);
  98
  99         return 0;
 100 }
 101
 102 static int
 103 time_cmp(void *a, void *b)
 104 {
 105         return -tv_cmp(&counts[*((int *) a)].time,
 106                        &counts[*((int *) b)].time);
 107 }
 108
 109 static int
 110 syscall_cmp(void *a, void *b)
 111 {
 112         return strcmp(sysent[*((int *) a)].sys_name,
 113                       sysent[*((int *) b)].sys_name);
 114 }
 115
 116 static int
 117 count_cmp(void *a, void *b)
 118 {
 119         int     m = counts[*((int *) a)].calls;
 120         int     n = counts[*((int *) b)].calls;
 121
 122         return (m < n) ? 1 : (m > n) ? -1 : 0;
 123 }
 124
 125 static int (*sortfun)();
 126 static struct timeval overhead = { -1, -1 };
 127
 128 void
 129 set_sortby(const char *sortby)
 130 {
 131         if (strcmp(sortby, "time") == 0)
 132                 sortfun = time_cmp;
 133         else if (strcmp(sortby, "calls") == 0)
 134                 sortfun = count_cmp;
 135         else if (strcmp(sortby, "name") == 0)
 136                 sortfun = syscall_cmp;
 137         else if (strcmp(sortby, "nothing") == 0)
 138                 sortfun = NULL;
 139         else {
 140                 fprintf(stderr, "invalid sortby: `%s'\n", sortby);
 141                 exit(1);
 142         }
 143 }
 144
 145 void set_overhead(int n)
 146 {
 147         overhead.tv_sec = n / 1000000;
 148         overhead.tv_usec = n % 1000000;
 149 }
 150
 151 static void
 152 call_summary_pers(FILE *outf)
 153 {
 154         int     i, j;
 155         int     call_cum, error_cum;
 156         struct timeval tv_cum, dtv;
 157         double  percent;
 158         const char *dashes = "-------------------------";
 159         char    error_str[16];
 160         int    *sorted_count = calloc(sizeof(int), nsyscalls);
 161
 162         if (!sorted_count) {
 163                 fprintf(stderr, "strace: out of memory for call summary\n");
 164                 return;
 165         }
 166
 167         call_cum = error_cum = tv_cum.tv_sec = tv_cum.tv_usec = 0;
 168         if (overhead.tv_sec == -1) {
 169                 tv_mul(&overhead, &shortest, 8);
 170                 tv_div(&overhead, &overhead, 10);
 171         }
 172         for (i = 0; i < nsyscalls; i++) {
 173                 sorted_count[i] = i;
 174                 if (counts == NULL || counts[i].calls == 0)
 175                         continue;
 176                 tv_mul(&dtv, &overhead, counts[i].calls);
 177                 tv_sub(&counts[i].time, &counts[i].time, &dtv);
 178                 call_cum += counts[i].calls;
 179                 error_cum += counts[i].errors;
 180                 tv_add(&tv_cum, &tv_cum, &counts[i].time);
 181         }
 182         if (counts && sortfun)
 183                 qsort((void *) sorted_count, nsyscalls, sizeof(int), sortfun);
 184         fprintf(outf, "%6.6s %11.11s %11.11s %9.9s %9.9s %s\n",
 185                 "% time", "seconds", "usecs/call",
 186                 "calls", "errors", "syscall");
 187         fprintf(outf, "%6.6s %11.11s %11.11s %9.9s %9.9s %-16.16s\n",
 188                 dashes, dashes, dashes, dashes, dashes, dashes);
 189         if (counts) {
 190                 for (i = 0; i < nsyscalls; i++) {
 191                         j = sorted_count[i];
 192                         if (counts[j].calls == 0)
 193                                 continue;
 194                         tv_div(&dtv, &counts[j].time, counts[j].calls);
 195                         if (counts[j].errors)
 196                                 sprintf(error_str, "%d", counts[j].errors);
 197                         else
 198                                 error_str[0] = '\0';
 199                         percent = (100.0 * tv_float(&counts[j].time)
 200                                    / tv_float(&tv_cum));
 201                         fprintf(outf, "%6.2f %11.6f %11ld %9d %9.9s %s\n",
 202                                 percent, tv_float(&counts[j].time),
 203                                 (long) 1000000 * dtv.tv_sec + dtv.tv_usec,
 204                                 counts[j].calls,
 205                                 error_str, sysent[j].sys_name);
 206                 }
 207         }
 208         free(sorted_count);
 209
 210         fprintf(outf, "%6.6s %11.11s %11.11s %9.9s %9.9s %-16.16s\n",
 211                 dashes, dashes, dashes, dashes, dashes, dashes);
 212         if (error_cum)
 213                 sprintf(error_str, "%d", error_cum);
 214         else
 215                 error_str[0] = '\0';
 216         fprintf(outf, "%6.6s %11.6f %11.11s %9d %9.9s %s\n",
 217                 "100.00", tv_float(&tv_cum), "",
 218                 call_cum, error_str, "total");
 219 }
 220
 221 void
 222 call_summary(FILE *outf)
 223 {
 224         int i, old_pers = current_personality;
 225
 226         for (i = 0; i < SUPPORTED_PERSONALITIES; ++i) {
 227                 if (!countv[i])
 228                         continue;
 229
 230                 if (current_personality != i)
 231                         set_personality(i);
 232                 if (i)
 233                         fprintf(outf,
 234                                 "System call usage summary for %u bit mode:\n",
 235                                 personality_wordsize[current_personality] * 8);
 236                 call_summary_pers(outf);
 237         }
 238
 239         if (old_pers != current_personality)
 240                 set_personality(old_pers);
 241 }