t_mincore.c revision 1.2
1/* $NetBSD: t_mincore.c,v 1.2 2011/07/14 08:09:48 jruoho 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 32/*- 33 * Copyright (c) 1999 The NetBSD Foundation, Inc. 34 * All rights reserved. 35 * 36 * This code is derived from software contributed to The NetBSD Foundation 37 * by Jason R. Thorpe of the Numerical Aerospace Simulation Facility, 38 * NASA Ames Research Center. 39 * 40 * Redistribution and use in source and binary forms, with or without 41 * modification, are permitted provided that the following conditions 42 * are met: 43 * 1. Redistributions of source code must retain the above copyright 44 * notice, this list of conditions and the following disclaimer. 45 * 2. Redistributions in binary form must reproduce the above copyright 46 * notice, this list of conditions and the following disclaimer in the 47 * documentation and/or other materials provided with the distribution. 48 * 49 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 50 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 51 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 52 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 53 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 54 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 55 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 56 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 57 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 58 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 59 * POSSIBILITY OF SUCH DAMAGE. 60 */ 61#include <sys/cdefs.h> 62__RCSID("$NetBSD: t_mincore.c,v 1.2 2011/07/14 08:09:48 jruoho Exp $"); 63 64#include <sys/mman.h> 65#include <sys/shm.h> 66 67#include <atf-c.h> 68#include <errno.h> 69#include <fcntl.h> 70#include <stdio.h> 71#include <stdlib.h> 72#include <string.h> 73#include <unistd.h> 74 75static long page = 0; 76static const char path[] = "mincore"; 77static size_t check_residency(void *, size_t); 78 79static size_t 80check_residency(void *addr, size_t npgs) 81{ 82 size_t i, resident; 83 char *vec; 84 85 vec = malloc(npgs); 86 87 ATF_REQUIRE(vec != NULL); 88 ATF_REQUIRE(mincore(addr, npgs * page, vec) == 0); 89 90 for (i = resident = 0; i < npgs; i++) { 91 92 if (vec[i] != 0) 93 resident++; 94 95 (void)fprintf(stderr, "page 0x%p is %sresident\n", 96 (char *)addr + (i * page), vec[i] ? "" : "not "); 97 } 98 99 free(vec); 100 101 return resident; 102} 103 104ATF_TC(mincore_err); 105ATF_TC_HEAD(mincore_err, tc) 106{ 107 atf_tc_set_md_var(tc, "descr", "Test errors from mincore(2)"); 108} 109 110ATF_TC_BODY(mincore_err, tc) 111{ 112 char *map, *vec; 113 114 map = mmap(NULL, page, PROT_WRITE, MAP_ANON | MAP_PRIVATE, -1, 0); 115 vec = malloc(page); 116 117 ATF_REQUIRE(vec != NULL); 118 ATF_REQUIRE(map != MAP_FAILED); 119 120 errno = 0; 121 ATF_REQUIRE_ERRNO(EINVAL, mincore(map, 0, vec) == -1); 122 123 errno = 0; 124 ATF_REQUIRE_ERRNO(ENOMEM, mincore(0, page, vec) == -1); 125 126 errno = 0; 127 ATF_REQUIRE_ERRNO(EFAULT, mincore(map, page, (void *)-1) == -1); 128 129 free(vec); 130 ATF_REQUIRE(munmap(map, page) == 0); 131} 132 133ATF_TC_WITH_CLEANUP(mincore_incore); 134ATF_TC_HEAD(mincore_incore, tc) 135{ 136 atf_tc_set_md_var(tc, "descr", "Test that mincore(2) works"); 137} 138 139ATF_TC_BODY(mincore_incore, tc) 140{ 141 char *buf, *vec, *map = MAP_FAILED; 142 const char *str = NULL; 143 const size_t n = 3; 144 ssize_t tot; 145 int fd, rv; 146 size_t i, j; 147 148 /* 149 * Create a temporary file, write 150 * few pages to it, and map the file. 151 */ 152 buf = calloc(n, page); 153 vec = calloc(n, page); 154 155 if (buf == NULL || vec == NULL) 156 return; 157 158 for (i = 0; i < (size_t)page * n; i++) 159 buf[i] = 'x'; 160 161 fd = open(path, O_RDWR | O_CREAT, 0600); 162 163 if (fd < 0) { 164 str = "failed to open"; 165 goto out; 166 } 167 168 tot = 0; 169 170 while (tot < page * (long)n) { 171 172 rv = write(fd, buf, sizeof(buf)); 173 174 if (rv < 0) { 175 str = "failed to write"; 176 goto out; 177 } 178 179 tot += rv; 180 } 181 182 map = mmap(NULL, page * n, PROT_READ | PROT_WRITE, 183 MAP_FILE | MAP_PRIVATE, fd, 0); 184 185 if (map == MAP_FAILED) { 186 str = "failed to map"; 187 goto out; 188 } 189 190 /* 191 * Lock the mapping such that only 192 * in-core page status is returned. 193 */ 194 if (mlock(map, page * n) != 0) { 195 str = "failed to lock"; 196 goto out; 197 } 198 199 if (mincore(map, page * n, vec) != 0) { 200 str = "mincore failed"; 201 goto out; 202 } 203 204 /* 205 * Check that the in-core pages 206 * match the locked pages. 207 */ 208 for (i = j = 0; i < (size_t)page * n; i++) { 209 210 if (vec[i] != 0) 211 j++; 212 } 213 214 if (j != n) 215 str = "mismatch of in-core pages"; 216 217out: 218 free(buf); 219 free(vec); 220 221 (void)close(fd); 222 (void)unlink(path); 223 224 if (map != MAP_FAILED) { 225 (void)munlock(map, page); 226 (void)munmap(map, page); 227 } 228 229 if (str != NULL) 230 atf_tc_fail("%s", str); 231} 232 233ATF_TC_CLEANUP(mincore_incore, tc) 234{ 235 (void)unlink(path); 236} 237 238ATF_TC_WITH_CLEANUP(mincore_residency); 239ATF_TC_HEAD(mincore_residency, tc) 240{ 241 atf_tc_set_md_var(tc, "descr", "mmap(2) residency with mincore(2)"); 242} 243 244ATF_TC_BODY(mincore_residency, tc) 245{ 246 void *addr, *addr2, *addr3, *buf; 247 size_t npgs = 0; 248 struct stat st; 249 ssize_t tot; 250 int fd, rv; 251 252 (void)memset(&st, 0, sizeof(struct stat)); 253 254 fd = open(path, O_RDWR | O_CREAT, 0700); 255 buf = malloc(page * 5); 256 257 ATF_REQUIRE(fd >= 0); 258 ATF_REQUIRE(buf != NULL); 259 260 tot = 0; 261 262 while (tot < page) { 263 264 rv = write(fd, buf, sizeof(buf)); 265 ATF_REQUIRE(rv >= 0); 266 267 tot += rv; 268 } 269 270 ATF_REQUIRE(fd >= 0); 271 ATF_REQUIRE(fstat(fd, &st) == 0); 272 273 addr = mmap(NULL, (size_t)st.st_size, PROT_READ, 274 MAP_FILE | MAP_SHARED, fd, (off_t) 0); 275 276 ATF_REQUIRE(addr != MAP_FAILED); 277 278 (void)close(fd); 279 280 npgs = st.st_size / page; 281 282 if (st.st_size % page != 0) 283 npgs++; 284 285 (void)check_residency(addr, npgs); 286 287 ATF_REQUIRE(mlock(addr, npgs * page) == 0); 288 ATF_REQUIRE(munmap(addr, st.st_size) == 0); 289 290 npgs = 128; 291 292 addr = mmap(NULL, npgs * page, PROT_READ | PROT_WRITE, 293 MAP_ANON | MAP_PRIVATE | MAP_WIRED, -1, (off_t)0); 294 295 if (addr == MAP_FAILED) 296 return; 297 298 ATF_REQUIRE(check_residency(addr, npgs) == npgs); 299 ATF_REQUIRE(munmap(addr, npgs * page) == 0); 300 301 npgs = 128; 302 303 addr = mmap(NULL, npgs * page, PROT_READ | PROT_WRITE, 304 MAP_ANON | MAP_PRIVATE, -1, (off_t)0); 305 306 if (addr == MAP_FAILED) 307 return; 308 309 ATF_REQUIRE(check_residency(addr, npgs) == 0); 310 ATF_REQUIRE(mlockall(MCL_CURRENT|MCL_FUTURE) == 0); 311 ATF_REQUIRE(check_residency(addr, npgs) == npgs); 312 313 addr2 = mmap(NULL, npgs * page, PROT_READ, MAP_ANON, -1, (off_t)0); 314 addr3 = mmap(NULL, npgs * page, PROT_NONE, MAP_ANON, -1, (off_t)0); 315 316 if (addr2 == MAP_FAILED || addr3 == MAP_FAILED) 317 return; 318 319 ATF_REQUIRE(check_residency(addr2, npgs) == npgs); 320 ATF_REQUIRE(check_residency(addr3, npgs) == 0); 321 ATF_REQUIRE(mprotect(addr3, npgs * page, PROT_READ) == 0); 322 ATF_REQUIRE(check_residency(addr, npgs) == npgs); 323 ATF_REQUIRE(check_residency(addr2, npgs) == npgs); 324 325 (void)munlockall(); 326 327 ATF_REQUIRE(madvise(addr2, npgs * page, MADV_FREE) == 0); 328 ATF_REQUIRE(check_residency(addr2, npgs) == 0); 329 330 (void)memset(addr, 0, npgs * page); 331 332 ATF_REQUIRE(madvise(addr, npgs * page, MADV_FREE) == 0); 333 ATF_REQUIRE(check_residency(addr, npgs) == 0); 334 335 (void)munmap(addr, npgs * page); 336 (void)munmap(addr2, npgs * page); 337 (void)munmap(addr3, npgs * page); 338 (void)unlink(path); 339} 340 341ATF_TC_CLEANUP(mincore_residency, tc) 342{ 343 (void)unlink(path); 344} 345 346ATF_TC(mincore_shmseg); 347ATF_TC_HEAD(mincore_shmseg, tc) 348{ 349 atf_tc_set_md_var(tc, "descr", "residency of shared memory"); 350} 351 352ATF_TC_BODY(mincore_shmseg, tc) 353{ 354 size_t npgs = 128; 355 void *addr = NULL; 356 int shmid; 357 358 shmid = shmget(IPC_PRIVATE, npgs * page, 359 IPC_CREAT | S_IRUSR | S_IWUSR); 360 361 ATF_REQUIRE(shmid != -1); 362 363 addr = shmat(shmid, NULL, 0); 364 365 ATF_REQUIRE(addr != NULL); 366 ATF_REQUIRE(check_residency(addr, npgs) == 0); 367 368 (void)memset(addr, 0xff, npgs * page); 369 370 ATF_REQUIRE(check_residency(addr, npgs) == npgs); 371 ATF_REQUIRE(madvise(addr, npgs * page, MADV_FREE) == 0); 372 373 /* 374 * NOTE! Even though we have MADV_FREE'd the range, 375 * there is another reference (the kernel's) to the 376 * object which owns the pages. In this case, the 377 * kernel does not simply free the pages, as haphazardly 378 * freeing pages when there are still references to 379 * an object can cause data corruption (say, the other 380 * referencer doesn't expect the pages to be freed, 381 * and is surprised by the subsequent ZFOD). 382 * 383 * Because of this, we simply report the number of 384 * pages still resident, for information only. 385 */ 386 npgs = check_residency(addr, npgs); 387 388 (void)fprintf(stderr, "%zu pages still resident\n", npgs); 389 390 ATF_REQUIRE(shmdt(addr) == 0); 391 ATF_REQUIRE(shmctl(shmid, IPC_RMID, NULL) == 0); 392} 393 394ATF_TP_ADD_TCS(tp) 395{ 396 397 page = sysconf(_SC_PAGESIZE); 398 ATF_REQUIRE(page >= 0); 399 400 ATF_TP_ADD_TC(tp, mincore_err); 401 ATF_TP_ADD_TC(tp, mincore_incore); 402 ATF_TP_ADD_TC(tp, mincore_residency); 403 ATF_TP_ADD_TC(tp, mincore_shmseg); 404 405 return atf_no_error(); 406} 407