xf.li | bdd93d5 | 2023-05-12 07:10:14 -0700 | [diff] [blame] | 1 | /* Tests for waitid. |
| 2 | Copyright (C) 2004-2016 Free Software Foundation, Inc. |
| 3 | This file is part of the GNU C Library. |
| 4 | |
| 5 | The GNU C Library is free software; you can redistribute it and/or |
| 6 | modify it under the terms of the GNU Lesser General Public |
| 7 | License as published by the Free Software Foundation; either |
| 8 | version 2.1 of the License, or (at your option) any later version. |
| 9 | |
| 10 | The GNU C Library is distributed in the hope that it will be useful, |
| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 13 | Lesser General Public License for more details. |
| 14 | |
| 15 | You should have received a copy of the GNU Lesser General Public |
| 16 | License along with the GNU C Library; if not, see |
| 17 | <http://www.gnu.org/licenses/>. */ |
| 18 | |
| 19 | #include <errno.h> |
| 20 | #include <stdio.h> |
| 21 | #include <stdlib.h> |
| 22 | #include <unistd.h> |
| 23 | #include <sys/wait.h> |
| 24 | #include <signal.h> |
| 25 | |
| 26 | #define TIMEOUT 15 |
| 27 | |
| 28 | static void |
| 29 | test_child (void) |
| 30 | { |
| 31 | /* Wait a second to be sure the parent set his variables before we |
| 32 | produce a SIGCHLD. */ |
| 33 | sleep (1); |
| 34 | |
| 35 | /* First thing, we stop ourselves. */ |
| 36 | raise (SIGSTOP); |
| 37 | |
| 38 | /* Hey, we got continued! */ |
| 39 | while (1) |
| 40 | pause (); |
| 41 | } |
| 42 | |
| 43 | #ifndef WEXITED |
| 44 | # define WEXITED 0 |
| 45 | # define WCONTINUED 0 |
| 46 | # define WSTOPPED WUNTRACED |
| 47 | #endif |
| 48 | |
| 49 | static sig_atomic_t expecting_sigchld, spurious_sigchld; |
| 50 | #ifdef SA_SIGINFO |
| 51 | static siginfo_t sigchld_info; |
| 52 | |
| 53 | static void |
| 54 | sigchld (int signo, siginfo_t *info, void *ctx) |
| 55 | { |
| 56 | if (signo != SIGCHLD) |
| 57 | { |
| 58 | printf ("SIGCHLD handler got signal %d instead!\n", signo); |
| 59 | _exit (EXIT_FAILURE); |
| 60 | } |
| 61 | |
| 62 | if (! expecting_sigchld) |
| 63 | { |
| 64 | spurious_sigchld = 1; |
| 65 | printf ("spurious SIGCHLD: signo %d code %d status %d pid %d\n", |
| 66 | info->si_signo, info->si_code, info->si_status, info->si_pid); |
| 67 | } |
| 68 | else |
| 69 | { |
| 70 | sigchld_info = *info; |
| 71 | expecting_sigchld = 0; |
| 72 | } |
| 73 | } |
| 74 | |
| 75 | static void |
| 76 | check_sigchld (const char *phase, int *ok, int code, int status, pid_t pid) |
| 77 | { |
| 78 | if (expecting_sigchld) |
| 79 | { |
| 80 | printf ("missing SIGCHLD on %s\n", phase); |
| 81 | *ok = EXIT_FAILURE; |
| 82 | expecting_sigchld = 0; |
| 83 | return; |
| 84 | } |
| 85 | |
| 86 | if (sigchld_info.si_signo != SIGCHLD) |
| 87 | { |
| 88 | printf ("SIGCHLD for %s signal %d\n", phase, sigchld_info.si_signo); |
| 89 | *ok = EXIT_FAILURE; |
| 90 | } |
| 91 | if (sigchld_info.si_code != code) |
| 92 | { |
| 93 | printf ("SIGCHLD for %s code %d\n", phase, sigchld_info.si_code); |
| 94 | *ok = EXIT_FAILURE; |
| 95 | } |
| 96 | if (sigchld_info.si_status != status) |
| 97 | { |
| 98 | printf ("SIGCHLD for %s status %d\n", phase, sigchld_info.si_status); |
| 99 | *ok = EXIT_FAILURE; |
| 100 | } |
| 101 | if (sigchld_info.si_pid != pid) |
| 102 | { |
| 103 | printf ("SIGCHLD for %s pid %d\n", phase, sigchld_info.si_pid); |
| 104 | *ok = EXIT_FAILURE; |
| 105 | } |
| 106 | } |
| 107 | # define CHECK_SIGCHLD(phase, code_check, status_check) \ |
| 108 | check_sigchld ((phase), &status, (code_check), (status_check), pid) |
| 109 | #else |
| 110 | # define CHECK_SIGCHLD(phase, code, status) ((void) 0) |
| 111 | #endif |
| 112 | |
| 113 | static int |
| 114 | do_test (int argc, char *argv[]) |
| 115 | { |
| 116 | #ifdef SA_SIGINFO |
| 117 | struct sigaction sa; |
| 118 | sa.sa_flags = SA_SIGINFO|SA_RESTART; |
| 119 | sa.sa_sigaction = &sigchld; |
| 120 | if (sigemptyset (&sa.sa_mask) < 0 || sigaction (SIGCHLD, &sa, NULL) < 0) |
| 121 | { |
| 122 | printf ("setting SIGCHLD handler: %m\n"); |
| 123 | return EXIT_FAILURE; |
| 124 | } |
| 125 | #endif |
| 126 | |
| 127 | expecting_sigchld = 1; |
| 128 | |
| 129 | pid_t pid = fork (); |
| 130 | if (pid < 0) |
| 131 | { |
| 132 | printf ("fork: %m\n"); |
| 133 | return EXIT_FAILURE; |
| 134 | } |
| 135 | else if (pid == 0) |
| 136 | { |
| 137 | test_child (); |
| 138 | _exit (127); |
| 139 | } |
| 140 | |
| 141 | int status = EXIT_SUCCESS; |
| 142 | #define RETURN(ok) \ |
| 143 | do { if (status == EXIT_SUCCESS) status = (ok); goto out; } while (0) |
| 144 | |
| 145 | /* Give the child a chance to stop. */ |
| 146 | sleep (3); |
| 147 | |
| 148 | CHECK_SIGCHLD ("stopped (before waitid)", CLD_STOPPED, SIGSTOP); |
| 149 | |
| 150 | /* Now try a wait that should not succeed. */ |
| 151 | siginfo_t info; |
| 152 | info.si_signo = 0; /* A successful call sets it to SIGCHLD. */ |
| 153 | int fail = waitid (P_PID, pid, &info, WEXITED|WCONTINUED|WNOHANG); |
| 154 | switch (fail) |
| 155 | { |
| 156 | default: |
| 157 | printf ("waitid returned bogus value %d\n", fail); |
| 158 | RETURN (EXIT_FAILURE); |
| 159 | case -1: |
| 160 | printf ("waitid WNOHANG on stopped: %m\n"); |
| 161 | RETURN (errno == ENOTSUP ? EXIT_SUCCESS : EXIT_FAILURE); |
| 162 | case 0: |
| 163 | if (info.si_signo == 0) |
| 164 | break; |
| 165 | if (info.si_signo == SIGCHLD) |
| 166 | printf ("waitid WNOHANG on stopped status %d\n", info.si_status); |
| 167 | else |
| 168 | printf ("waitid WNOHANG on stopped signal %d\n", info.si_signo); |
| 169 | RETURN (EXIT_FAILURE); |
| 170 | } |
| 171 | |
| 172 | /* Next the wait that should succeed right away. */ |
| 173 | info.si_signo = 0; /* A successful call sets it to SIGCHLD. */ |
| 174 | info.si_pid = -1; |
| 175 | info.si_status = -1; |
| 176 | fail = waitid (P_PID, pid, &info, WSTOPPED|WNOHANG); |
| 177 | switch (fail) |
| 178 | { |
| 179 | default: |
| 180 | printf ("waitid WSTOPPED|WNOHANG returned bogus value %d\n", fail); |
| 181 | RETURN (EXIT_FAILURE); |
| 182 | case -1: |
| 183 | printf ("waitid WSTOPPED|WNOHANG on stopped: %m\n"); |
| 184 | RETURN (errno == ENOTSUP ? EXIT_SUCCESS : EXIT_FAILURE); |
| 185 | case 0: |
| 186 | if (info.si_signo != SIGCHLD) |
| 187 | { |
| 188 | printf ("waitid WSTOPPED|WNOHANG on stopped signal %d\n", |
| 189 | info.si_signo); |
| 190 | RETURN (EXIT_FAILURE); |
| 191 | } |
| 192 | if (info.si_code != CLD_STOPPED) |
| 193 | { |
| 194 | printf ("waitid WSTOPPED|WNOHANG on stopped code %d\n", |
| 195 | info.si_code); |
| 196 | RETURN (EXIT_FAILURE); |
| 197 | } |
| 198 | if (info.si_status != SIGSTOP) |
| 199 | { |
| 200 | printf ("waitid WSTOPPED|WNOHANG on stopped status %d\n", |
| 201 | info.si_status); |
| 202 | RETURN (EXIT_FAILURE); |
| 203 | } |
| 204 | if (info.si_pid != pid) |
| 205 | { |
| 206 | printf ("waitid WSTOPPED|WNOHANG on stopped pid %d != %d\n", |
| 207 | info.si_pid, pid); |
| 208 | RETURN (EXIT_FAILURE); |
| 209 | } |
| 210 | } |
| 211 | |
| 212 | expecting_sigchld = WCONTINUED != 0; |
| 213 | |
| 214 | if (kill (pid, SIGCONT) != 0) |
| 215 | { |
| 216 | printf ("kill (%d, SIGCONT): %m\n", pid); |
| 217 | RETURN (EXIT_FAILURE); |
| 218 | } |
| 219 | |
| 220 | /* Wait for the child to have continued. */ |
| 221 | sleep (2); |
| 222 | |
| 223 | #if WCONTINUED != 0 |
| 224 | if (expecting_sigchld) |
| 225 | { |
| 226 | printf ("no SIGCHLD seen for SIGCONT (optional)\n"); |
| 227 | expecting_sigchld = 0; |
| 228 | } |
| 229 | else |
| 230 | CHECK_SIGCHLD ("continued (before waitid)", CLD_CONTINUED, SIGCONT); |
| 231 | |
| 232 | info.si_signo = 0; /* A successful call sets it to SIGCHLD. */ |
| 233 | info.si_pid = -1; |
| 234 | info.si_status = -1; |
| 235 | fail = waitid (P_PID, pid, &info, WCONTINUED|WNOWAIT); |
| 236 | switch (fail) |
| 237 | { |
| 238 | default: |
| 239 | printf ("waitid WCONTINUED|WNOWAIT returned bogus value %d\n", fail); |
| 240 | RETURN (EXIT_FAILURE); |
| 241 | case -1: |
| 242 | printf ("waitid WCONTINUED|WNOWAIT on continued: %m\n"); |
| 243 | RETURN (errno == ENOTSUP ? EXIT_SUCCESS : EXIT_FAILURE); |
| 244 | case 0: |
| 245 | if (info.si_signo != SIGCHLD) |
| 246 | { |
| 247 | printf ("waitid WCONTINUED|WNOWAIT on continued signal %d\n", |
| 248 | info.si_signo); |
| 249 | RETURN (EXIT_FAILURE); |
| 250 | } |
| 251 | if (info.si_code != CLD_CONTINUED) |
| 252 | { |
| 253 | printf ("waitid WCONTINUED|WNOWAIT on continued code %d\n", |
| 254 | info.si_code); |
| 255 | RETURN (EXIT_FAILURE); |
| 256 | } |
| 257 | if (info.si_status != SIGCONT) |
| 258 | { |
| 259 | printf ("waitid WCONTINUED|WNOWAIT on continued status %d\n", |
| 260 | info.si_status); |
| 261 | RETURN (EXIT_FAILURE); |
| 262 | } |
| 263 | if (info.si_pid != pid) |
| 264 | { |
| 265 | printf ("waitid WCONTINUED|WNOWAIT on continued pid %d != %d\n", |
| 266 | info.si_pid, pid); |
| 267 | RETURN (EXIT_FAILURE); |
| 268 | } |
| 269 | } |
| 270 | |
| 271 | /* That should leave the CLD_CONTINUED state waiting to be seen again. */ |
| 272 | info.si_signo = 0; /* A successful call sets it to SIGCHLD. */ |
| 273 | info.si_pid = -1; |
| 274 | info.si_status = -1; |
| 275 | fail = waitid (P_PID, pid, &info, WCONTINUED); |
| 276 | switch (fail) |
| 277 | { |
| 278 | default: |
| 279 | printf ("waitid WCONTINUED returned bogus value %d\n", fail); |
| 280 | RETURN (EXIT_FAILURE); |
| 281 | case -1: |
| 282 | printf ("waitid WCONTINUED on continued: %m\n"); |
| 283 | RETURN (errno == ENOTSUP ? EXIT_SUCCESS : EXIT_FAILURE); |
| 284 | case 0: |
| 285 | if (info.si_signo != SIGCHLD) |
| 286 | { |
| 287 | printf ("waitid WCONTINUED on continued signal %d\n", info.si_signo); |
| 288 | RETURN (EXIT_FAILURE); |
| 289 | } |
| 290 | if (info.si_code != CLD_CONTINUED) |
| 291 | { |
| 292 | printf ("waitid WCONTINUED on continued code %d\n", info.si_code); |
| 293 | RETURN (EXIT_FAILURE); |
| 294 | } |
| 295 | if (info.si_status != SIGCONT) |
| 296 | { |
| 297 | printf ("waitid WCONTINUED on continued status %d\n", |
| 298 | info.si_status); |
| 299 | RETURN (EXIT_FAILURE); |
| 300 | } |
| 301 | if (info.si_pid != pid) |
| 302 | { |
| 303 | printf ("waitid WCONTINUED on continued pid %d != %d\n", |
| 304 | info.si_pid, pid); |
| 305 | RETURN (EXIT_FAILURE); |
| 306 | } |
| 307 | } |
| 308 | |
| 309 | /* Now try a wait that should not succeed. */ |
| 310 | info.si_signo = 0; /* A successful call sets it to SIGCHLD. */ |
| 311 | fail = waitid (P_PID, pid, &info, WCONTINUED|WNOHANG); |
| 312 | switch (fail) |
| 313 | { |
| 314 | default: |
| 315 | printf ("waitid returned bogus value %d\n", fail); |
| 316 | RETURN (EXIT_FAILURE); |
| 317 | case -1: |
| 318 | printf ("waitid WCONTINUED|WNOHANG on waited continued: %m\n"); |
| 319 | RETURN (errno == ENOTSUP ? EXIT_SUCCESS : EXIT_FAILURE); |
| 320 | case 0: |
| 321 | if (info.si_signo == 0) |
| 322 | break; |
| 323 | if (info.si_signo == SIGCHLD) |
| 324 | printf ("waitid WCONTINUED|WNOHANG on waited continued status %d\n", |
| 325 | info.si_status); |
| 326 | else |
| 327 | printf ("waitid WCONTINUED|WNOHANG on waited continued signal %d\n", |
| 328 | info.si_signo); |
| 329 | RETURN (EXIT_FAILURE); |
| 330 | } |
| 331 | |
| 332 | /* Now stop him again and test waitpid with WCONTINUED. */ |
| 333 | expecting_sigchld = 1; |
| 334 | if (kill (pid, SIGSTOP) != 0) |
| 335 | { |
| 336 | printf ("kill (%d, SIGSTOP): %m\n", pid); |
| 337 | RETURN (EXIT_FAILURE); |
| 338 | } |
| 339 | |
| 340 | /* Give the child a chance to stop. The waitpid call below will block |
| 341 | until it has stopped, but if we are real quick and enter the waitpid |
| 342 | system call before the SIGCHLD has been generated, then it will be |
| 343 | discarded and never delivered. */ |
| 344 | sleep (3); |
| 345 | |
| 346 | pid_t wpid = waitpid (pid, &fail, WUNTRACED); |
| 347 | if (wpid < 0) |
| 348 | { |
| 349 | printf ("waitpid WUNTRACED on stopped: %m\n"); |
| 350 | RETURN (EXIT_FAILURE); |
| 351 | } |
| 352 | else if (wpid != pid) |
| 353 | { |
| 354 | printf ("waitpid WUNTRACED on stopped returned %d != %d (status %x)\n", |
| 355 | wpid, pid, fail); |
| 356 | RETURN (EXIT_FAILURE); |
| 357 | } |
| 358 | else if (!WIFSTOPPED (fail) || WIFSIGNALED (fail) || WIFEXITED (fail) |
| 359 | || WIFCONTINUED (fail) || WSTOPSIG (fail) != SIGSTOP) |
| 360 | { |
| 361 | printf ("waitpid WUNTRACED on stopped: status %x\n", fail); |
| 362 | RETURN (EXIT_FAILURE); |
| 363 | } |
| 364 | CHECK_SIGCHLD ("stopped (after waitpid)", CLD_STOPPED, SIGSTOP); |
| 365 | |
| 366 | expecting_sigchld = 1; |
| 367 | if (kill (pid, SIGCONT) != 0) |
| 368 | { |
| 369 | printf ("kill (%d, SIGCONT): %m\n", pid); |
| 370 | RETURN (EXIT_FAILURE); |
| 371 | } |
| 372 | |
| 373 | /* Wait for the child to have continued. */ |
| 374 | sleep (2); |
| 375 | |
| 376 | if (expecting_sigchld) |
| 377 | { |
| 378 | printf ("no SIGCHLD seen for SIGCONT (optional)\n"); |
| 379 | expecting_sigchld = 0; |
| 380 | } |
| 381 | else |
| 382 | CHECK_SIGCHLD ("continued (before waitpid)", CLD_CONTINUED, SIGCONT); |
| 383 | |
| 384 | wpid = waitpid (pid, &fail, WCONTINUED); |
| 385 | if (wpid < 0) |
| 386 | { |
| 387 | if (errno == EINVAL) |
| 388 | printf ("waitpid does not support WCONTINUED\n"); |
| 389 | else |
| 390 | { |
| 391 | printf ("waitpid WCONTINUED on continued: %m\n"); |
| 392 | RETURN (EXIT_FAILURE); |
| 393 | } |
| 394 | } |
| 395 | else if (wpid != pid) |
| 396 | { |
| 397 | printf ("\ |
| 398 | waitpid WCONTINUED on continued returned %d != %d (status %x)\n", |
| 399 | wpid, pid, fail); |
| 400 | RETURN (EXIT_FAILURE); |
| 401 | } |
| 402 | else if (WIFSTOPPED (fail) || WIFSIGNALED (fail) || WIFEXITED (fail) |
| 403 | || !WIFCONTINUED (fail)) |
| 404 | { |
| 405 | printf ("waitpid WCONTINUED on continued: status %x\n", fail); |
| 406 | RETURN (EXIT_FAILURE); |
| 407 | } |
| 408 | #endif |
| 409 | |
| 410 | expecting_sigchld = 1; |
| 411 | |
| 412 | /* Die, child, die! */ |
| 413 | if (kill (pid, SIGKILL) != 0) |
| 414 | { |
| 415 | printf ("kill (%d, SIGKILL): %m\n", pid); |
| 416 | RETURN (EXIT_FAILURE); |
| 417 | } |
| 418 | |
| 419 | #ifdef WNOWAIT |
| 420 | info.si_signo = 0; /* A successful call sets it to SIGCHLD. */ |
| 421 | info.si_pid = -1; |
| 422 | info.si_status = -1; |
| 423 | fail = waitid (P_PID, pid, &info, WEXITED|WNOWAIT); |
| 424 | switch (fail) |
| 425 | { |
| 426 | default: |
| 427 | printf ("waitid WNOWAIT returned bogus value %d\n", fail); |
| 428 | RETURN (EXIT_FAILURE); |
| 429 | case -1: |
| 430 | printf ("waitid WNOWAIT on killed: %m\n"); |
| 431 | RETURN (errno == ENOTSUP ? EXIT_SUCCESS : EXIT_FAILURE); |
| 432 | case 0: |
| 433 | if (info.si_signo != SIGCHLD) |
| 434 | { |
| 435 | printf ("waitid WNOWAIT on killed signal %d\n", info.si_signo); |
| 436 | RETURN (EXIT_FAILURE); |
| 437 | } |
| 438 | if (info.si_code != CLD_KILLED) |
| 439 | { |
| 440 | printf ("waitid WNOWAIT on killed code %d\n", info.si_code); |
| 441 | RETURN (EXIT_FAILURE); |
| 442 | } |
| 443 | if (info.si_status != SIGKILL) |
| 444 | { |
| 445 | printf ("waitid WNOWAIT on killed status %d\n", info.si_status); |
| 446 | RETURN (EXIT_FAILURE); |
| 447 | } |
| 448 | if (info.si_pid != pid) |
| 449 | { |
| 450 | printf ("waitid WNOWAIT on killed pid %d != %d\n", info.si_pid, pid); |
| 451 | RETURN (EXIT_FAILURE); |
| 452 | } |
| 453 | } |
| 454 | #else |
| 455 | /* Allow enough time to be sure the child died; we didn't synchronize. */ |
| 456 | sleep (2); |
| 457 | #endif |
| 458 | |
| 459 | CHECK_SIGCHLD ("killed", CLD_KILLED, SIGKILL); |
| 460 | |
| 461 | info.si_signo = 0; /* A successful call sets it to SIGCHLD. */ |
| 462 | info.si_pid = -1; |
| 463 | info.si_status = -1; |
| 464 | fail = waitid (P_PID, pid, &info, WEXITED|WNOHANG); |
| 465 | switch (fail) |
| 466 | { |
| 467 | default: |
| 468 | printf ("waitid WNOHANG returned bogus value %d\n", fail); |
| 469 | RETURN (EXIT_FAILURE); |
| 470 | case -1: |
| 471 | printf ("waitid WNOHANG on killed: %m\n"); |
| 472 | RETURN (EXIT_FAILURE); |
| 473 | case 0: |
| 474 | if (info.si_signo != SIGCHLD) |
| 475 | { |
| 476 | printf ("waitid WNOHANG on killed signal %d\n", info.si_signo); |
| 477 | RETURN (EXIT_FAILURE); |
| 478 | } |
| 479 | if (info.si_code != CLD_KILLED) |
| 480 | { |
| 481 | printf ("waitid WNOHANG on killed code %d\n", info.si_code); |
| 482 | RETURN (EXIT_FAILURE); |
| 483 | } |
| 484 | if (info.si_status != SIGKILL) |
| 485 | { |
| 486 | printf ("waitid WNOHANG on killed status %d\n", info.si_status); |
| 487 | RETURN (EXIT_FAILURE); |
| 488 | } |
| 489 | if (info.si_pid != pid) |
| 490 | { |
| 491 | printf ("waitid WNOHANG on killed pid %d != %d\n", info.si_pid, pid); |
| 492 | RETURN (EXIT_FAILURE); |
| 493 | } |
| 494 | } |
| 495 | |
| 496 | fail = waitid (P_PID, pid, &info, WEXITED); |
| 497 | if (fail == -1) |
| 498 | { |
| 499 | if (errno != ECHILD) |
| 500 | { |
| 501 | printf ("waitid WEXITED on killed: %m\n"); |
| 502 | RETURN (EXIT_FAILURE); |
| 503 | } |
| 504 | } |
| 505 | else |
| 506 | { |
| 507 | printf ("waitid WEXITED returned bogus value %d\n", fail); |
| 508 | RETURN (EXIT_FAILURE); |
| 509 | } |
| 510 | |
| 511 | #undef RETURN |
| 512 | out: |
| 513 | if (spurious_sigchld) |
| 514 | status = EXIT_FAILURE; |
| 515 | signal (SIGCHLD, SIG_IGN); |
| 516 | kill (pid, SIGKILL); /* Make sure it's dead if we bailed early. */ |
| 517 | return status; |
| 518 | } |
| 519 | |
| 520 | #include "../test-skeleton.c" |