tests/lib/libc/sys/t_msync.c

   1 /* $NetBSD: t_msync.c,v 1.2 2012/03/16 06:15:17 matt Exp $ */
   2
   3 /*-
   4  * Copyright (c) 2011 The NetBSD Foundation, Inc.
   5  * All rights reserved.
   6  *
   7  * This code is derived from software contributed to The NetBSD Foundation
   8  * by Jukka Ruohonen.
   9  *
  10  * Redistribution and use in source and binary forms, with or without
  11  * modification, are permitted provided that the following conditions
  12  * are met:
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in the
  17  *    documentation and/or other materials provided with the distribution.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
  20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
  21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
  23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  29  * POSSIBILITY OF SUCH DAMAGE.
  30  */
  31 #include <sys/cdefs.h>
  32 __RCSID("$NetBSD: t_msync.c,v 1.2 2012/03/16 06:15:17 matt Exp $");
  33
  34 #include <sys/mman.h>
  35
  36 #include <atf-c.h>
  37 #include <errno.h>
  38 #include <fcntl.h>
  39 #include <limits.h>
  40 #include <stdlib.h>
  41 #include <string.h>
  42 #include <unistd.h>
  43
  44 static long             page = 0;
  45 static const off_t      off = 512;
  46 static const char       path[] = "msync";
  47
  48 static const char       *msync_sync(const char *, int);
  49
  50 static const char *
  51 msync_sync(const char *garbage, int flags)
  52 {
  53         char *buf, *map = MAP_FAILED;
  54         const char *str = NULL;
  55         size_t i, len;
  56         ssize_t tot;
  57         int fd, rv;
  58
  59         /*
  60          * Create a temporary file, write
  61          * one page to it, and map the file.
  62          */
  63         buf = malloc(page);
  64
  65         if (buf == NULL)
  66                 return NULL;
  67
  68         for (i = 0; i < (size_t)page; i++)
  69                 buf[i] = 'x';
  70
  71         fd = open(path, O_RDWR | O_CREAT, 0700);
  72
  73         if (fd < 0) {
  74                 str = "failed to open";
  75                 goto out;
  76         }
  77
  78         tot = 0;
  79
  80         while (tot < page) {
  81
  82                 rv = write(fd, buf, sizeof(buf));
  83
  84                 if (rv < 0) {
  85                         str = "failed to write";
  86                         goto out;
  87                 }
  88
  89                 tot += rv;
  90         }
  91
  92         map = mmap(NULL, page, PROT_READ | PROT_WRITE, MAP_FILE|MAP_PRIVATE,
  93              fd, 0);
  94
  95         if (map == MAP_FAILED) {
  96                 str = "failed to map";
  97                 goto out;
  98         }
  99
 100         /*
 101          * Seek to an arbitrary offset and
 102          * write garbage to this position.
 103          */
 104         if (lseek(fd, off, SEEK_SET) != off) {
 105                 str = "failed to seek";
 106                 goto out;
 107         }
 108
 109         len = strlen(garbage);
 110         rv = write(fd, garbage, len);
 111
 112         if (rv != (ssize_t)len) {
 113                 str = "failed to write garbage";
 114                 goto out;
 115         }
 116
 117         /*
 118          * Synchronize the mapping and verify
 119          * that garbage is at the given offset.
 120          */
 121         if (msync(map, page, flags) != 0) {
 122                 str = "failed to msync";
 123                 goto out;
 124         }
 125
 126         if (memcmp(map + off, garbage, len) != 0) {
 127                 str = "msync did not synchronize";
 128                 goto out;
 129         }
 130
 131 out:
 132         free(buf);
 133
 134         (void)close(fd);
 135         (void)unlink(path);
 136
 137         if (map != MAP_FAILED)
 138                 (void)munmap(map, page);
 139
 140         return str;
 141 }
 142
 143 ATF_TC(msync_async);
 144 ATF_TC_HEAD(msync_async, tc)
 145 {
 146         atf_tc_set_md_var(tc, "descr", "Test of msync(2), MS_ASYNC");
 147 }
 148
 149 ATF_TC_BODY(msync_async, tc)
 150 {
 151         const char *str;
 152
 153         str = msync_sync("garbage", MS_ASYNC);
 154
 155         if (str != NULL)
 156                 atf_tc_fail("%s", str);
 157 }
 158
 159 ATF_TC(msync_err);
 160 ATF_TC_HEAD(msync_err, tc)
 161 {
 162         atf_tc_set_md_var(tc, "descr", "Test error conditions in msync(2)");
 163 }
 164
 165 ATF_TC_BODY(msync_err, tc)
 166 {
 167
 168         char *map = MAP_FAILED;
 169
 170         /*
 171          * Test that invalid flags error out.
 172          */
 173         ATF_REQUIRE(msync_sync("error", -1) != NULL);
 174         ATF_REQUIRE(msync_sync("error", INT_MAX) != NULL);
 175
 176         errno = 0;
 177
 178         /*
 179          * Map a page and then unmap to get an unmapped address.
 180          */
 181         map = mmap(NULL, page, PROT_READ | PROT_WRITE, MAP_ANON | MAP_PRIVATE,
 182             -1, 0);
 183         ATF_REQUIRE(map != MAP_FAILED);
 184
 185         (void)munmap(map, page);
 186
 187         ATF_REQUIRE(msync(map, page, MS_SYNC) != 0);
 188         ATF_REQUIRE(errno == EFAULT);
 189 }
 190
 191 ATF_TC(msync_invalidate);
 192 ATF_TC_HEAD(msync_invalidate, tc)
 193 {
 194         atf_tc_set_md_var(tc, "descr", "Test of msync(2), MS_INVALIDATE");
 195 }
 196
 197 ATF_TC_BODY(msync_invalidate, tc)
 198 {
 199         const char *str;
 200
 201         str = msync_sync("garbage", MS_INVALIDATE);
 202
 203         if (str != NULL)
 204                 atf_tc_fail("%s", str);
 205 }
 206
 207 ATF_TC(msync_sync);
 208 ATF_TC_HEAD(msync_sync, tc)
 209 {
 210         atf_tc_set_md_var(tc, "descr", "Test of msync(2), MS_SYNC");
 211 }
 212
 213 ATF_TC_BODY(msync_sync, tc)
 214 {
 215         const char *str;
 216
 217         str = msync_sync("garbage", MS_SYNC);
 218
 219         if (str != NULL)
 220                 atf_tc_fail("%s", str);
 221 }
 222
 223 ATF_TP_ADD_TCS(tp)
 224 {
 225
 226         page = sysconf(_SC_PAGESIZE);
 227
 228         ATF_REQUIRE(page >= 0);
 229         ATF_REQUIRE(page > off);
 230
 231         ATF_TP_ADD_TC(tp, msync_async);
 232         ATF_TP_ADD_TC(tp, msync_err);
 233         ATF_TP_ADD_TC(tp, msync_invalidate);
 234         ATF_TP_ADD_TC(tp, msync_sync);
 235
 236         return atf_no_error();
 237 }