tests/lib/libc/gen/t_randomid.c

   1 /* $NetBSD: t_randomid.c,v 1.5 2015/03/07 09:59:15 isaki Exp $ */
   2
   3 /*-
   4  * Copyright (c) 2010 The NetBSD Foundation, Inc.
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
  17  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
  18  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  19  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
  20  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  21  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  22  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  23  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  24  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  25  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  26  * POSSIBILITY OF SUCH DAMAGE.
  27  */
  28
  29 #include <atf-c.h>
  30
  31 #include <sys/types.h>
  32
  33 #include <assert.h>
  34 #include <inttypes.h>
  35 #include <randomid.h>
  36 #include <stdio.h>
  37 #include <string.h>
  38
  39 #define PERIOD          30000
  40
  41 uint32_t last[65536];
  42
  43 ATF_TC(randomid_basic);
  44 ATF_TC_HEAD(randomid_basic, tc)
  45 {
  46
  47         atf_tc_set_md_var(tc, "descr", "Check randomid(3)");
  48 }
  49
  50 ATF_TC_BODY(randomid_basic, tc)
  51 {
  52         static randomid_t ctx = NULL;
  53         uint32_t lowest, n, diff;
  54         uint16_t id;
  55
  56         memset(last, 0, sizeof(last));
  57         ctx = randomid_new(16, (long)3600);
  58
  59         lowest = UINT32_MAX;
  60
  61         for (n = 0; n < 100000; n++) {
  62                 id = randomid(ctx);
  63
  64                 if (last[id] > 0) {
  65                         diff = n - last[id];
  66
  67                         if (diff <= lowest) {
  68                                 if (lowest != UINT32_MAX)
  69                                         printf("id %5d: last call at %9"PRIu32
  70                                             ", current call %9"PRIu32
  71                                             " (diff %5"PRIu32"), "
  72                                             "lowest %"PRIu32"\n",
  73                                             id, last[id], n, diff, lowest);
  74
  75                                 ATF_REQUIRE_MSG(diff >= PERIOD,
  76                                     "diff (%"PRIu32") less than minimum "
  77                                     "period (%d)", diff, PERIOD);
  78
  79                                 lowest = diff;
  80                         }
  81                 }
  82
  83                 last[id] = n;
  84         }
  85 }
  86
  87 ATF_TP_ADD_TCS(tp)
  88 {
  89
  90         ATF_TP_ADD_TC(tp, randomid_basic);
  91
  92         return atf_no_error();
  93 }