Jan Stancek | a0e618c | 2013-06-07 11:09:26 +0200 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2013 Linux Test Project |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or |
| 5 | * modify it under the terms of version 2 of the GNU General Public |
| 6 | * License as published by the Free Software Foundation. |
| 7 | * |
| 8 | * This program is distributed in the hope that it would be useful, |
| 9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. |
| 11 | * |
| 12 | * Further, this software is distributed without any warranty that it |
| 13 | * is free of the rightful claim of any third person regarding |
| 14 | * infringement or the like. Any license provided herein, whether |
| 15 | * implied or otherwise, applies only to this software file. Patent |
| 16 | * licenses, if any, provided herein do not apply to combinations of |
| 17 | * this program with other software, or any other product whatsoever. |
| 18 | * |
| 19 | * You should have received a copy of the GNU General Public License |
| 20 | * along with this program; if not, write the Free Software |
| 21 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
| 22 | * 02110-1301, USA. |
| 23 | */ |
| 24 | /* |
| 25 | * Test /dev/kmsg based on kernel doc: Documentation/ABI/testing/dev-kmsg |
| 26 | * - read() blocks |
| 27 | * - non-blocking read() fails with EAGAIN |
| 28 | * - partial read fails (buffer smaller than message) |
| 29 | * - can write to /dev/kmsg and message seqno grows |
| 30 | * - first read() after open() returns same message |
| 31 | * - if messages get overwritten, read() returns -EPIPE |
| 32 | * - device supports SEEK_SET, SEEK_END, SEEK_DATA |
| 33 | */ |
| 34 | #define _GNU_SOURCE |
| 35 | #include <sys/types.h> |
| 36 | #include <sys/stat.h> |
| 37 | #include <sys/syscall.h> |
| 38 | #include <sys/wait.h> |
| 39 | #include <errno.h> |
| 40 | #include <fcntl.h> |
| 41 | #include <stdio.h> |
| 42 | #include <stdlib.h> |
| 43 | #include <string.h> |
| 44 | #include <unistd.h> |
| 45 | #include "config.h" |
| 46 | #include "test.h" |
Jan Stancek | a0e618c | 2013-06-07 11:09:26 +0200 | [diff] [blame] | 47 | #include "safe_macros.h" |
| 48 | #include "linux_syscall_numbers.h" |
| 49 | |
| 50 | #define MSG_PREFIX "LTP kmsg01 " |
| 51 | #define MAX_MSGSIZE 4096 |
| 52 | #define NUM_READ_MSGS 3 |
| 53 | #define NUM_READ_RETRY 10 |
| 54 | #define NUM_OVERWRITE_MSGS 1024 |
| 55 | #define READ_TIMEOUT 5 |
| 56 | |
| 57 | char *TCID = "kmsg01"; |
| 58 | static void setup(void); |
| 59 | static void cleanup(void); |
| 60 | |
| 61 | /* |
| 62 | * inject_msg - write message to /dev/kmsg |
| 63 | * @msg: null-terminated message to inject, should end with \n |
| 64 | * |
| 65 | * RETURNS: |
| 66 | * 0 on success |
| 67 | * -1 on failure, errno reflects write() errno |
| 68 | */ |
| 69 | static int inject_msg(const char *msg) |
| 70 | { |
| 71 | int f; |
| 72 | f = open("/dev/kmsg", O_WRONLY); |
| 73 | if (f < 0) |
| 74 | tst_brkm(TBROK | TERRNO, cleanup, "failed to open /dev/kmsg"); |
| 75 | TEST(write(f, msg, strlen(msg))); |
| 76 | SAFE_CLOSE(cleanup, f); |
| 77 | errno = TEST_ERRNO; |
| 78 | return TEST_RETURN; |
| 79 | } |
| 80 | |
| 81 | /* |
| 82 | * find_msg - find message in kernel ring buffer |
| 83 | * @fd: fd to use, if < 0 function opens /dev/kmsg itself |
| 84 | * @text_to_find: substring to look for in messages |
| 85 | * @buf: buf to store found message |
| 86 | * @bufsize: size of 'buf' |
| 87 | * @first: 1 - return first matching message |
| 88 | * 0 - return last matching message |
| 89 | * RETURNS: |
| 90 | * 0 on success |
| 91 | * -1 on failure |
| 92 | */ |
| 93 | static int find_msg(int fd, const char *text_to_find, char *buf, int bufsize, |
| 94 | int first) |
| 95 | { |
| 96 | int f, msg_found = 0; |
| 97 | char msg[MAX_MSGSIZE + 1]; |
| 98 | |
| 99 | if (fd < 0) { |
| 100 | f = open("/dev/kmsg", O_RDONLY | O_NONBLOCK); |
| 101 | if (f < 0) |
| 102 | tst_brkm(TBROK, cleanup, "failed to open /dev/kmsg"); |
| 103 | } else { |
| 104 | f = fd; |
| 105 | } |
| 106 | |
| 107 | while (1) { |
| 108 | TEST(read(f, msg, sizeof(msg))); |
| 109 | if (TEST_RETURN < 0) { |
| 110 | if (TEST_ERRNO == EAGAIN) |
| 111 | /* there are no more messages */ |
| 112 | break; |
| 113 | else if (TEST_ERRNO == EPIPE) |
| 114 | /* current message was overwritten */ |
| 115 | continue; |
| 116 | else |
| 117 | tst_brkm(TBROK|TTERRNO, cleanup, |
| 118 | "failed to read /dev/kmsg"); |
| 119 | } else if (TEST_RETURN < bufsize) { |
| 120 | /* lines from kmsg are not NULL terminated */ |
| 121 | msg[TEST_RETURN] = '\0'; |
| 122 | if (strstr(msg, text_to_find) != NULL) { |
| 123 | strncpy(buf, msg, bufsize); |
| 124 | msg_found = 1; |
| 125 | if (first) |
| 126 | break; |
| 127 | } |
| 128 | } |
| 129 | } |
| 130 | if (fd < 0) |
| 131 | SAFE_CLOSE(cleanup, f); |
| 132 | |
| 133 | if (msg_found) |
| 134 | return 0; |
| 135 | else |
| 136 | return -1; |
| 137 | } |
| 138 | |
| 139 | static int get_msg_fields(const char *msg, unsigned long *prio, |
| 140 | unsigned long *seqno) |
| 141 | { |
| 142 | unsigned long s, p; |
| 143 | if (sscanf(msg, "%lu,%lu,", &p, &s) == 2) { |
| 144 | if (prio) |
| 145 | *prio = p; |
| 146 | if (seqno) |
| 147 | *seqno = s; |
| 148 | return 0; |
| 149 | } else { |
| 150 | return 1; |
| 151 | } |
| 152 | } |
| 153 | |
| 154 | /* |
| 155 | * timed_read - if possible reads from fd or times out |
| 156 | * @fd: fd to read from |
| 157 | * @timeout_sec: timeout in seconds |
| 158 | * |
| 159 | * RETURNS: |
| 160 | * read bytes on successful read |
| 161 | * -1 on read() error, errno reflects read() errno |
| 162 | * -2 on timeout |
| 163 | */ |
| 164 | static int timed_read(int fd, int timeout_sec) |
| 165 | { |
| 166 | int ret, tmp; |
| 167 | struct timeval timeout; |
| 168 | fd_set read_fds; |
| 169 | |
| 170 | FD_ZERO(&read_fds); |
| 171 | FD_SET(fd, &read_fds); |
| 172 | timeout.tv_sec = timeout_sec; |
| 173 | timeout.tv_usec = 0; |
| 174 | |
| 175 | ret = select(fd + 1, &read_fds, 0, 0, &timeout); |
| 176 | switch (ret) { |
| 177 | case -1: |
| 178 | tst_brkm(TBROK|TERRNO, cleanup, "select failed"); |
| 179 | case 0: |
| 180 | /* select timed out */ |
| 181 | return -2; |
| 182 | } |
| 183 | |
| 184 | return read(fd, &tmp, 1); |
| 185 | } |
| 186 | |
| 187 | /* |
| 188 | * timed_read_kmsg - reads file until it reaches end of file, |
| 189 | * read fails or times out. This ignores any |
| 190 | * EPIPE errors. |
| 191 | * @fd: fd to read from |
| 192 | * @timeout_sec: timeout in seconds for every read attempt |
| 193 | * |
| 194 | * RETURNS: |
| 195 | * 0 on read reaching eof |
| 196 | * -1 on read error, errno reflects read() errno |
| 197 | * -2 on timeout |
| 198 | */ |
| 199 | static int timed_read_kmsg(int fd, int timeout_sec) |
| 200 | { |
| 201 | int child, status, ret = 0; |
| 202 | int pipefd[2]; |
| 203 | char msg[MAX_MSGSIZE]; |
| 204 | |
| 205 | if (pipe(pipefd) != 0) |
| 206 | tst_brkm(TBROK|TERRNO, cleanup, "pipe failed"); |
| 207 | |
| 208 | child = fork(); |
| 209 | switch (child) { |
| 210 | case -1: |
| 211 | tst_brkm(TBROK|TERRNO, cleanup, "failed to fork"); |
| 212 | case 0: |
| 213 | /* child does all the reading and keeps writing to |
| 214 | * pipe to let parent know that it didn't block */ |
| 215 | close(pipefd[0]); |
| 216 | while (1) { |
| 217 | write(pipefd[1], "", 1); |
| 218 | TEST(read(fd, msg, MAX_MSGSIZE)); |
| 219 | if (TEST_RETURN == 0) |
| 220 | break; |
| 221 | if (TEST_RETURN == -1 && TEST_ERRNO != EPIPE) { |
| 222 | ret = TEST_ERRNO; |
| 223 | break; |
| 224 | } |
| 225 | } |
| 226 | |
| 227 | close(pipefd[1]); |
| 228 | exit(ret); |
| 229 | } |
| 230 | SAFE_CLOSE(cleanup, pipefd[1]); |
| 231 | |
| 232 | /* parent reads pipe until it reaches eof or until read times out */ |
| 233 | do { |
| 234 | TEST(timed_read(pipefd[0], timeout_sec)); |
| 235 | } while (TEST_RETURN > 0); |
| 236 | SAFE_CLOSE(cleanup, pipefd[0]); |
| 237 | |
| 238 | /* child is blocked, kill it */ |
| 239 | if (TEST_RETURN == -2) |
| 240 | kill(child, SIGTERM); |
| 241 | if (waitpid(child, &status, 0) == -1) |
| 242 | tst_brkm(TBROK | TERRNO, cleanup, "waitpid"); |
| 243 | if (WIFEXITED(status)) { |
| 244 | if (WEXITSTATUS(status) == 0) { |
| 245 | return 0; |
| 246 | } else { |
| 247 | errno = WEXITSTATUS(status); |
| 248 | return -1; |
| 249 | } |
| 250 | } |
| 251 | return -2; |
| 252 | } |
| 253 | |
| 254 | static void test_read_nonblock(void) |
| 255 | { |
| 256 | int fd; |
| 257 | |
| 258 | tst_resm(TINFO, "TEST: nonblock read"); |
| 259 | fd = open("/dev/kmsg", O_RDONLY | O_NONBLOCK); |
| 260 | if (fd < 0) |
| 261 | tst_brkm(TBROK|TERRNO, cleanup, "failed to open /dev/kmsg"); |
| 262 | |
| 263 | TEST(timed_read_kmsg(fd, READ_TIMEOUT)); |
| 264 | if (TEST_RETURN == -1 && TEST_ERRNO == EAGAIN) |
| 265 | tst_resm(TPASS, "non-block read returned EAGAIN"); |
| 266 | else |
| 267 | tst_resm(TFAIL|TTERRNO, "non-block read returned: %ld", |
| 268 | TEST_RETURN); |
| 269 | SAFE_CLOSE(cleanup, fd); |
| 270 | } |
| 271 | |
| 272 | static void test_read_block(void) |
| 273 | { |
| 274 | int fd; |
| 275 | |
| 276 | tst_resm(TINFO, "TEST: blocking read"); |
| 277 | fd = open("/dev/kmsg", O_RDONLY); |
| 278 | if (fd < 0) |
| 279 | tst_brkm(TBROK|TERRNO, cleanup, "failed to open /dev/kmsg"); |
| 280 | |
| 281 | TEST(timed_read_kmsg(fd, READ_TIMEOUT)); |
| 282 | if (TEST_RETURN == -2) |
| 283 | tst_resm(TPASS, "read blocked"); |
| 284 | else |
| 285 | tst_resm(TFAIL|TTERRNO, "read returned: %ld", TEST_RETURN); |
| 286 | SAFE_CLOSE(cleanup, fd); |
| 287 | } |
| 288 | |
| 289 | static void test_partial_read(void) |
| 290 | { |
| 291 | char msg[MAX_MSGSIZE]; |
| 292 | int fd; |
| 293 | |
| 294 | tst_resm(TINFO, "TEST: partial read"); |
| 295 | fd = open("/dev/kmsg", O_RDONLY | O_NONBLOCK); |
| 296 | if (fd < 0) |
| 297 | tst_brkm(TBROK|TERRNO, cleanup, "failed to open /dev/kmsg"); |
| 298 | |
| 299 | TEST(read(fd, msg, 1)); |
| 300 | if (TEST_RETURN < 0) |
| 301 | tst_resm(TPASS|TTERRNO, "read failed as expected"); |
| 302 | else |
| 303 | tst_resm(TFAIL, "read returned: %ld", TEST_RETURN); |
| 304 | SAFE_CLOSE(cleanup, fd); |
| 305 | } |
| 306 | |
| 307 | static void test_inject(void) |
| 308 | { |
| 309 | char imsg[MAX_MSGSIZE], imsg_prefixed[MAX_MSGSIZE]; |
| 310 | char tmp[MAX_MSGSIZE]; |
| 311 | unsigned long prefix, seqno, seqno_last = 0; |
| 312 | int i, facility, prio; |
| 313 | |
| 314 | tst_resm(TINFO, "TEST: injected messages appear in /dev/kmsg"); |
| 315 | |
| 316 | /* test all combinations of prio 0-7, facility 0-15 */ |
| 317 | for (i = 0; i < 127; i++) { |
| 318 | prio = (i & 7); |
| 319 | facility = (i >> 3); |
| 320 | sprintf(imsg, MSG_PREFIX"TEST MESSAGE %ld prio: %d, " |
| 321 | "facility: %d\n", random(), prio, facility); |
| 322 | sprintf(imsg_prefixed, "<%d>%s", i, imsg); |
| 323 | |
| 324 | if (inject_msg(imsg_prefixed) == -1) { |
| 325 | tst_resm(TFAIL|TERRNO, "inject failed"); |
| 326 | return; |
| 327 | } |
| 328 | |
| 329 | /* check that message appears in log */ |
| 330 | if (find_msg(-1, imsg, tmp, sizeof(tmp), 0) == -1) { |
| 331 | tst_resm(TFAIL, "failed to find: %s", imsg); |
| 332 | return; |
| 333 | } |
| 334 | |
| 335 | /* check that facility is not 0 (LOG_KERN). */ |
| 336 | if (get_msg_fields(tmp, &prefix, &seqno) != 0) { |
| 337 | tst_resm(TFAIL, "failed to parse seqid: %s", tmp); |
| 338 | return; |
| 339 | } |
| 340 | if (prefix >> 3 == 0) { |
| 341 | tst_resm(TFAIL, "facility 0 found: %s", tmp); |
| 342 | return; |
| 343 | } |
| 344 | |
| 345 | /* check that seq. number grows */ |
| 346 | if (seqno > seqno_last) { |
| 347 | seqno_last = seqno; |
| 348 | } else { |
| 349 | tst_resm(TFAIL, "seqno doesn't grow: %lu, " |
| 350 | "last: %lu", seqno, seqno_last); |
| 351 | return; |
| 352 | } |
| 353 | } |
| 354 | |
| 355 | tst_resm(TPASS, "injected messages found in log"); |
| 356 | tst_resm(TPASS, "sequence numbers grow as expected"); |
| 357 | } |
| 358 | |
| 359 | static void test_read_returns_first_message(void) |
| 360 | { |
| 361 | unsigned long seqno[NUM_READ_MSGS + 1]; |
| 362 | char msg[MAX_MSGSIZE]; |
| 363 | int msgs_match = 1; |
| 364 | int i, fd, j = NUM_READ_RETRY; |
| 365 | |
| 366 | /* Open extra fd, which we try to read after reading NUM_READ_MSGS. |
| 367 | * If this read fails with EPIPE, first message was overwritten and |
| 368 | * we should retry the whole test. If it still fails after |
| 369 | * NUM_READ_RETRY attempts, report TWARN */ |
| 370 | tst_resm(TINFO, "TEST: mult. readers will get same first message"); |
| 371 | while (j) { |
| 372 | fd = open("/dev/kmsg", O_RDONLY | O_NONBLOCK); |
| 373 | if (fd < 0) |
| 374 | tst_brkm(TBROK|TERRNO, cleanup, |
| 375 | "failed to open /dev/kmsg"); |
| 376 | |
| 377 | for (i = 0; i < NUM_READ_MSGS; i++) { |
| 378 | if (find_msg(-1, "", msg, sizeof(msg), 1) != 0) |
| 379 | tst_resm(TFAIL, "failed to find any message"); |
| 380 | if (get_msg_fields(msg, NULL, &seqno[i]) != 0) |
| 381 | tst_resm(TFAIL, "failed to parse seqid: %s", |
| 382 | msg); |
| 383 | } |
| 384 | |
| 385 | TEST(read(fd, msg, sizeof(msg))); |
| 386 | SAFE_CLOSE(cleanup, fd); |
| 387 | if (TEST_RETURN != -1) |
| 388 | break; |
| 389 | |
| 390 | if (TEST_ERRNO == EPIPE) |
| 391 | tst_resm(TINFO, "msg overwritten, retrying"); |
| 392 | else |
| 393 | tst_resm(TFAIL|TTERRNO, "read failed"); |
| 394 | |
| 395 | /* give a second to whoever overwrote first message to finish */ |
| 396 | sleep(1); |
| 397 | j--; |
| 398 | } |
| 399 | |
| 400 | if (!j) { |
| 401 | tst_resm(TWARN, "exceeded: %d attempts", NUM_READ_RETRY); |
| 402 | return; |
| 403 | } |
| 404 | |
| 405 | for (i = 0; i < NUM_READ_MSGS - 1; i++) |
| 406 | if (seqno[i] != seqno[i + 1]) |
| 407 | msgs_match = 0; |
| 408 | if (msgs_match) { |
| 409 | tst_resm(TPASS, "all readers got same message on first read"); |
| 410 | } else { |
| 411 | tst_resm(TFAIL, "readers got different messages"); |
| 412 | for (i = 0; i < NUM_READ_MSGS; i++) |
| 413 | tst_resm(TINFO, "msg%d: %lu\n", i, seqno[i]); |
| 414 | } |
| 415 | } |
| 416 | |
| 417 | static void test_messages_overwritten(void) |
| 418 | { |
| 419 | int i, fd; |
| 420 | char msg[MAX_MSGSIZE]; |
| 421 | unsigned long first_seqno, seqno; |
| 422 | char filler_str[] = MSG_PREFIX"FILLER MESSAGE TO OVERWRITE OTHERS\n"; |
| 423 | |
| 424 | /* Keep injecting messages until we overwrite first one. |
| 425 | * We know first message is overwritten when its seqno changes */ |
| 426 | tst_resm(TINFO, "TEST: read returns EPIPE when messages get " |
| 427 | "overwritten"); |
| 428 | fd = open("/dev/kmsg", O_RDONLY | O_NONBLOCK); |
| 429 | if (fd < 0) |
| 430 | tst_brkm(TBROK|TERRNO, cleanup, "failed to open /dev/kmsg"); |
| 431 | |
| 432 | if (find_msg(-1, "", msg, sizeof(msg), 1) == 0 |
| 433 | && get_msg_fields(msg, NULL, &first_seqno) == 0) { |
| 434 | tst_resm(TINFO, "first seqno: %lu", first_seqno); |
| 435 | } else { |
| 436 | tst_brkm(TBROK, cleanup, "failed to get first seq. number"); |
| 437 | } |
| 438 | |
| 439 | while (1) { |
| 440 | if (find_msg(-1, "", msg, sizeof(msg), 1) != 0 |
| 441 | || get_msg_fields(msg, NULL, &seqno) != 0) { |
| 442 | tst_resm(TFAIL, "failed to get first seq. number"); |
| 443 | break; |
| 444 | } |
| 445 | if (first_seqno != seqno) { |
| 446 | /* first message was overwritten */ |
| 447 | tst_resm(TINFO, "first seqno now: %lu", seqno); |
| 448 | break; |
| 449 | } |
| 450 | for (i = 0; i < NUM_OVERWRITE_MSGS; i++) { |
| 451 | if (inject_msg(filler_str) == -1) |
| 452 | tst_brkm(TBROK|TERRNO, cleanup, |
| 453 | "failed write to /dev/kmsg"); |
| 454 | } |
| 455 | } |
| 456 | |
| 457 | /* first message is overwritten, so this next read should fail */ |
| 458 | TEST(read(fd, msg, sizeof(msg))); |
| 459 | if (TEST_RETURN == -1 && TEST_ERRNO == EPIPE) |
| 460 | tst_resm(TPASS, "read failed with EPIPE as expected"); |
| 461 | else |
| 462 | tst_resm(TFAIL|TTERRNO, "read returned: %ld", TEST_RETURN); |
| 463 | |
| 464 | /* seek position is updated to the next available record */ |
| 465 | tst_resm(TINFO, "TEST: Subsequent reads() will return available " |
| 466 | "records again"); |
| 467 | if (find_msg(fd, "", msg, sizeof(msg), 1) != 0) |
| 468 | tst_resm(TFAIL|TTERRNO, "read returned: %ld", TEST_RETURN); |
| 469 | else |
| 470 | tst_resm(TPASS, "after EPIPE read returned next record"); |
| 471 | |
| 472 | SAFE_CLOSE(cleanup, fd); |
| 473 | } |
| 474 | |
| 475 | static void test_seek(void) |
| 476 | { |
| 477 | int k, j = NUM_READ_RETRY, fd; |
| 478 | char msg[MAX_MSGSIZE]; |
| 479 | unsigned long seqno[2]; |
| 480 | |
| 481 | /* 1. read() after SEEK_SET 0 returns same (first) message */ |
| 482 | tst_resm(TINFO, "TEST: seek SEEK_SET 0"); |
| 483 | |
| 484 | fd = open("/dev/kmsg", O_RDONLY | O_NONBLOCK); |
| 485 | if (fd < 0) |
| 486 | tst_brkm(TBROK|TERRNO, cleanup, "failed to open /dev/kmsg"); |
| 487 | |
| 488 | while (j) { |
| 489 | for (k = 0; k < 2; k++) { |
| 490 | TEST(read(fd, msg, sizeof(msg))); |
| 491 | if (TEST_RETURN == -1) { |
| 492 | if (errno == EPIPE) |
| 493 | break; |
| 494 | else |
| 495 | tst_brkm(TBROK|TTERRNO, cleanup, |
| 496 | "failed to read /dev/kmsg"); |
| 497 | } |
| 498 | if (get_msg_fields(msg, NULL, &seqno[k]) != 0) |
| 499 | tst_resm(TFAIL, "failed to parse seqid: %s", |
| 500 | msg); |
| 501 | if (k == 0) |
| 502 | if (lseek(fd, 0, SEEK_SET) == -1) |
| 503 | tst_resm(TFAIL|TERRNO, |
| 504 | "SEEK_SET 0 failed"); |
| 505 | } |
| 506 | |
| 507 | if (TEST_RETURN != -1) |
| 508 | break; |
| 509 | |
| 510 | /* give a second to whoever overwrote first message to finish */ |
| 511 | sleep(1); |
| 512 | j--; |
| 513 | |
| 514 | /* read above has returned EPIPE, reopen fd and try again */ |
| 515 | SAFE_CLOSE(cleanup, fd); |
| 516 | fd = open("/dev/kmsg", O_RDONLY | O_NONBLOCK); |
| 517 | if (fd < 0) |
| 518 | tst_brkm(TBROK|TERRNO, cleanup, |
| 519 | "failed to open /dev/kmsg"); |
| 520 | } |
| 521 | |
| 522 | if (!j) { |
| 523 | tst_resm(TWARN, "exceeded: %d attempts", NUM_READ_RETRY); |
| 524 | } else { |
| 525 | if (seqno[0] != seqno[1]) |
| 526 | tst_resm(TFAIL, "SEEK_SET 0"); |
| 527 | else |
| 528 | tst_resm(TPASS, "SEEK_SET 0"); |
| 529 | } |
| 530 | |
| 531 | /* 2. messages after SEEK_END 0 shouldn't contain MSG_PREFIX */ |
| 532 | tst_resm(TINFO, "TEST: seek SEEK_END 0"); |
| 533 | if (lseek(fd, 0, SEEK_END) == -1) |
| 534 | tst_resm(TFAIL|TERRNO, "lseek SEEK_END 0 failed"); |
| 535 | if (find_msg(fd, MSG_PREFIX, msg, sizeof(msg), 0) != 0) |
| 536 | tst_resm(TPASS, "SEEK_END 0"); |
| 537 | else |
| 538 | tst_resm(TFAIL, "SEEK_END 0 found: %s", msg); |
| 539 | |
| 540 | #ifdef SEEK_DATA |
| 541 | /* 3. messages after SEEK_DATA 0 shouldn't contain MSG_PREFIX */ |
| 542 | tst_resm(TINFO, "TEST: seek SEEK_DATA 0"); |
| 543 | |
| 544 | /* clear ring buffer */ |
| 545 | if (ltp_syscall(__NR_syslog, 5, NULL, 0) == -1) |
| 546 | tst_brkm(TBROK|TERRNO, cleanup, "syslog clear failed"); |
| 547 | if (lseek(fd, 0, SEEK_DATA) == -1) |
| 548 | tst_resm(TFAIL|TERRNO, "lseek SEEK_DATA 0 failed"); |
| 549 | if (find_msg(fd, MSG_PREFIX, msg, sizeof(msg), 0) != 0) |
| 550 | tst_resm(TPASS, "SEEK_DATA 0"); |
| 551 | else |
| 552 | tst_resm(TFAIL, "SEEK_DATA 0 found: %s", msg); |
| 553 | #endif |
| 554 | SAFE_CLOSE(cleanup, fd); |
| 555 | } |
| 556 | |
| 557 | int main(int argc, char *argv[]) |
| 558 | { |
| 559 | int lc; |
Cyril Hrubis | 0b9589f | 2014-05-27 17:40:33 +0200 | [diff] [blame] | 560 | const char *msg; |
Jan Stancek | a0e618c | 2013-06-07 11:09:26 +0200 | [diff] [blame] | 561 | |
| 562 | msg = parse_opts(argc, argv, NULL, NULL); |
| 563 | if (msg != NULL) |
| 564 | tst_brkm(TBROK, tst_exit, "OPTION PARSING ERROR - %s", msg); |
| 565 | |
| 566 | setup(); |
| 567 | for (lc = 0; TEST_LOOPING(lc); lc++) { |
| 568 | /* run test_inject first so log isn't empty for other tests */ |
| 569 | test_inject(); |
| 570 | test_read_nonblock(); |
| 571 | test_read_block(); |
| 572 | test_partial_read(); |
| 573 | test_read_returns_first_message(); |
| 574 | test_messages_overwritten(); |
| 575 | test_seek(); |
| 576 | } |
| 577 | cleanup(); |
| 578 | tst_exit(); |
| 579 | } |
| 580 | |
| 581 | static void setup(void) |
| 582 | { |
| 583 | tst_require_root(NULL); |
| 584 | if (tst_kvercmp(3, 5, 0) < 0) |
| 585 | tst_brkm(TCONF, NULL, "This test requires kernel" |
| 586 | " >= 3.5.0"); |
| 587 | srand(getpid()); |
| 588 | TEST_PAUSE; |
| 589 | } |
| 590 | |
| 591 | static void cleanup(void) |
| 592 | { |
Jan Stancek | a0e618c | 2013-06-07 11:09:26 +0200 | [diff] [blame] | 593 | } |