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      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 }
     94