1 /*- 2 * SPDX-License-Identifier: BSD-4-Clause 3 * 4 * Copyright 1997 Sean Eric Fagan 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 3. All advertising materials mentioning features or use of this software 15 * must display the following acknowledgement: 16 * This product includes software developed by Sean Eric Fagan 17 * 4. Neither the name of the author may be used to endorse or promote 18 * products derived from this software without specific prior written 19 * permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34 #include <sys/cdefs.h> 35 __FBSDID("$FreeBSD$"); 36 37 /* 38 * Various setup functions for truss. Not the cleanest-written code, 39 * I'm afraid. 40 */ 41 42 #include <sys/ptrace.h> 43 #include <sys/sysctl.h> 44 #include <sys/time.h> 45 #include <sys/wait.h> 46 47 #include <assert.h> 48 #include <err.h> 49 #include <errno.h> 50 #include <signal.h> 51 #include <stdbool.h> 52 #include <stdint.h> 53 #include <stdio.h> 54 #include <stdlib.h> 55 #include <string.h> 56 #include <sysdecode.h> 57 #include <time.h> 58 #include <unistd.h> 59 60 #include "truss.h" 61 #include "syscall.h" 62 #include "extern.h" 63 64 struct procabi_table { 65 const char *name; 66 struct procabi *abi; 67 }; 68 69 static sig_atomic_t detaching; 70 71 static void enter_syscall(struct trussinfo *, struct threadinfo *, 72 struct ptrace_lwpinfo *); 73 static void new_proc(struct trussinfo *, pid_t, lwpid_t); 74 75 76 static struct procabi cloudabi32 = { 77 "CloudABI32", 78 SYSDECODE_ABI_CLOUDABI32, 79 STAILQ_HEAD_INITIALIZER(cloudabi32.extra_syscalls), 80 { NULL } 81 }; 82 83 static struct procabi cloudabi64 = { 84 "CloudABI64", 85 SYSDECODE_ABI_CLOUDABI64, 86 STAILQ_HEAD_INITIALIZER(cloudabi64.extra_syscalls), 87 { NULL } 88 }; 89 90 static struct procabi freebsd = { 91 "FreeBSD", 92 SYSDECODE_ABI_FREEBSD, 93 STAILQ_HEAD_INITIALIZER(freebsd.extra_syscalls), 94 { NULL } 95 }; 96 97 #ifdef __LP64__ 98 static struct procabi freebsd32 = { 99 "FreeBSD32", 100 SYSDECODE_ABI_FREEBSD32, 101 STAILQ_HEAD_INITIALIZER(freebsd32.extra_syscalls), 102 { NULL } 103 }; 104 #endif 105 106 static struct procabi linux = { 107 "Linux", 108 SYSDECODE_ABI_LINUX, 109 STAILQ_HEAD_INITIALIZER(linux.extra_syscalls), 110 { NULL } 111 }; 112 113 #ifdef __LP64__ 114 static struct procabi linux32 = { 115 "Linux32", 116 SYSDECODE_ABI_LINUX32, 117 STAILQ_HEAD_INITIALIZER(linux32.extra_syscalls), 118 { NULL } 119 }; 120 #endif 121 122 static struct procabi_table abis[] = { 123 { "CloudABI ELF32", &cloudabi32 }, 124 { "CloudABI ELF64", &cloudabi64 }, 125 #ifdef __LP64__ 126 { "FreeBSD ELF64", &freebsd }, 127 { "FreeBSD ELF32", &freebsd32 }, 128 #else 129 { "FreeBSD ELF32", &freebsd }, 130 #endif 131 #if defined(__powerpc64__) 132 { "FreeBSD ELF64 V2", &freebsd }, 133 #endif 134 #if defined(__amd64__) 135 { "FreeBSD a.out", &freebsd32 }, 136 #endif 137 #if defined(__i386__) 138 { "FreeBSD a.out", &freebsd }, 139 #endif 140 #ifdef __LP64__ 141 { "Linux ELF64", &linux }, 142 { "Linux ELF32", &linux32 }, 143 #else 144 { "Linux ELF", &linux }, 145 #endif 146 }; 147 148 /* 149 * setup_and_wait() is called to start a process. All it really does 150 * is fork(), enable tracing in the child, and then exec the given 151 * command. At that point, the child process stops, and the parent 152 * can wake up and deal with it. 153 */ 154 void 155 setup_and_wait(struct trussinfo *info, char *command[]) 156 { 157 pid_t pid; 158 159 pid = vfork(); 160 if (pid == -1) 161 err(1, "fork failed"); 162 if (pid == 0) { /* Child */ 163 ptrace(PT_TRACE_ME, 0, 0, 0); 164 execvp(command[0], command); 165 err(1, "execvp %s", command[0]); 166 } 167 168 /* Only in the parent here */ 169 if (waitpid(pid, NULL, 0) < 0) 170 err(1, "unexpect stop in waitpid"); 171 172 new_proc(info, pid, 0); 173 } 174 175 /* 176 * start_tracing is called to attach to an existing process. 177 */ 178 void 179 start_tracing(struct trussinfo *info, pid_t pid) 180 { 181 int ret, retry; 182 183 retry = 10; 184 do { 185 ret = ptrace(PT_ATTACH, pid, NULL, 0); 186 usleep(200); 187 } while (ret && retry-- > 0); 188 if (ret) 189 err(1, "can not attach to target process"); 190 191 if (waitpid(pid, NULL, 0) < 0) 192 err(1, "Unexpect stop in waitpid"); 193 194 new_proc(info, pid, 0); 195 } 196 197 /* 198 * Restore a process back to it's pre-truss state. 199 * Called for SIGINT, SIGTERM, SIGQUIT. This only 200 * applies if truss was told to monitor an already-existing 201 * process. 202 */ 203 void 204 restore_proc(int signo __unused) 205 { 206 207 detaching = 1; 208 } 209 210 static void 211 detach_proc(pid_t pid) 212 { 213 214 /* stop the child so that we can detach */ 215 kill(pid, SIGSTOP); 216 if (waitpid(pid, NULL, 0) < 0) 217 err(1, "Unexpected stop in waitpid"); 218 219 if (ptrace(PT_DETACH, pid, (caddr_t)1, 0) < 0) 220 err(1, "Can not detach the process"); 221 222 kill(pid, SIGCONT); 223 } 224 225 /* 226 * Determine the ABI. This is called after every exec, and when 227 * a process is first monitored. 228 */ 229 static struct procabi * 230 find_abi(pid_t pid) 231 { 232 size_t len; 233 unsigned int i; 234 int error; 235 int mib[4]; 236 char progt[32]; 237 238 len = sizeof(progt); 239 mib[0] = CTL_KERN; 240 mib[1] = KERN_PROC; 241 mib[2] = KERN_PROC_SV_NAME; 242 mib[3] = pid; 243 error = sysctl(mib, 4, progt, &len, NULL, 0); 244 if (error != 0) 245 err(2, "can not get sysvec name"); 246 247 for (i = 0; i < nitems(abis); i++) { 248 if (strcmp(abis[i].name, progt) == 0) 249 return (abis[i].abi); 250 } 251 warnx("ABI %s for pid %ld is not supported", progt, (long)pid); 252 return (NULL); 253 } 254 255 static struct threadinfo * 256 new_thread(struct procinfo *p, lwpid_t lwpid) 257 { 258 struct threadinfo *nt; 259 260 /* 261 * If this happens it means there is a bug in truss. Unfortunately 262 * this will kill any processes truss is attached to. 263 */ 264 LIST_FOREACH(nt, &p->threadlist, entries) { 265 if (nt->tid == lwpid) 266 errx(1, "Duplicate thread for LWP %ld", (long)lwpid); 267 } 268 269 nt = calloc(1, sizeof(struct threadinfo)); 270 if (nt == NULL) 271 err(1, "calloc() failed"); 272 nt->proc = p; 273 nt->tid = lwpid; 274 LIST_INSERT_HEAD(&p->threadlist, nt, entries); 275 return (nt); 276 } 277 278 static void 279 free_thread(struct threadinfo *t) 280 { 281 282 LIST_REMOVE(t, entries); 283 free(t); 284 } 285 286 static void 287 add_threads(struct trussinfo *info, struct procinfo *p) 288 { 289 struct ptrace_lwpinfo pl; 290 struct threadinfo *t; 291 lwpid_t *lwps; 292 int i, nlwps; 293 294 nlwps = ptrace(PT_GETNUMLWPS, p->pid, NULL, 0); 295 if (nlwps == -1) 296 err(1, "Unable to fetch number of LWPs"); 297 assert(nlwps > 0); 298 lwps = calloc(nlwps, sizeof(*lwps)); 299 nlwps = ptrace(PT_GETLWPLIST, p->pid, (caddr_t)lwps, nlwps); 300 if (nlwps == -1) 301 err(1, "Unable to fetch LWP list"); 302 for (i = 0; i < nlwps; i++) { 303 t = new_thread(p, lwps[i]); 304 if (ptrace(PT_LWPINFO, lwps[i], (caddr_t)&pl, sizeof(pl)) == -1) 305 err(1, "ptrace(PT_LWPINFO)"); 306 if (pl.pl_flags & PL_FLAG_SCE) { 307 info->curthread = t; 308 enter_syscall(info, t, &pl); 309 } 310 } 311 free(lwps); 312 } 313 314 static void 315 new_proc(struct trussinfo *info, pid_t pid, lwpid_t lwpid) 316 { 317 struct procinfo *np; 318 319 /* 320 * If this happens it means there is a bug in truss. Unfortunately 321 * this will kill any processes truss is attached to. 322 */ 323 LIST_FOREACH(np, &info->proclist, entries) { 324 if (np->pid == pid) 325 errx(1, "Duplicate process for pid %ld", (long)pid); 326 } 327 328 if (info->flags & FOLLOWFORKS) 329 if (ptrace(PT_FOLLOW_FORK, pid, NULL, 1) == -1) 330 err(1, "Unable to follow forks for pid %ld", (long)pid); 331 if (ptrace(PT_LWP_EVENTS, pid, NULL, 1) == -1) 332 err(1, "Unable to enable LWP events for pid %ld", (long)pid); 333 np = calloc(1, sizeof(struct procinfo)); 334 np->pid = pid; 335 np->abi = find_abi(pid); 336 LIST_INIT(&np->threadlist); 337 LIST_INSERT_HEAD(&info->proclist, np, entries); 338 339 if (lwpid != 0) 340 new_thread(np, lwpid); 341 else 342 add_threads(info, np); 343 } 344 345 static void 346 free_proc(struct procinfo *p) 347 { 348 struct threadinfo *t, *t2; 349 350 LIST_FOREACH_SAFE(t, &p->threadlist, entries, t2) { 351 free(t); 352 } 353 LIST_REMOVE(p, entries); 354 free(p); 355 } 356 357 static void 358 detach_all_procs(struct trussinfo *info) 359 { 360 struct procinfo *p, *p2; 361 362 LIST_FOREACH_SAFE(p, &info->proclist, entries, p2) { 363 detach_proc(p->pid); 364 free_proc(p); 365 } 366 } 367 368 static struct procinfo * 369 find_proc(struct trussinfo *info, pid_t pid) 370 { 371 struct procinfo *np; 372 373 LIST_FOREACH(np, &info->proclist, entries) { 374 if (np->pid == pid) 375 return (np); 376 } 377 378 return (NULL); 379 } 380 381 /* 382 * Change curthread member based on (pid, lwpid). 383 */ 384 static void 385 find_thread(struct trussinfo *info, pid_t pid, lwpid_t lwpid) 386 { 387 struct procinfo *np; 388 struct threadinfo *nt; 389 390 np = find_proc(info, pid); 391 assert(np != NULL); 392 393 LIST_FOREACH(nt, &np->threadlist, entries) { 394 if (nt->tid == lwpid) { 395 info->curthread = nt; 396 return; 397 } 398 } 399 errx(1, "could not find thread"); 400 } 401 402 /* 403 * When a process exits, it should have exactly one thread left. 404 * All of the other threads should have reported thread exit events. 405 */ 406 static void 407 find_exit_thread(struct trussinfo *info, pid_t pid) 408 { 409 struct procinfo *p; 410 411 p = find_proc(info, pid); 412 assert(p != NULL); 413 414 info->curthread = LIST_FIRST(&p->threadlist); 415 assert(info->curthread != NULL); 416 assert(LIST_NEXT(info->curthread, entries) == NULL); 417 } 418 419 static void 420 alloc_syscall(struct threadinfo *t, struct ptrace_lwpinfo *pl) 421 { 422 u_int i; 423 424 assert(t->in_syscall == 0); 425 assert(t->cs.number == 0); 426 assert(t->cs.sc == NULL); 427 assert(t->cs.nargs == 0); 428 for (i = 0; i < nitems(t->cs.s_args); i++) 429 assert(t->cs.s_args[i] == NULL); 430 memset(t->cs.args, 0, sizeof(t->cs.args)); 431 t->cs.number = pl->pl_syscall_code; 432 t->in_syscall = 1; 433 } 434 435 static void 436 free_syscall(struct threadinfo *t) 437 { 438 u_int i; 439 440 for (i = 0; i < t->cs.nargs; i++) 441 free(t->cs.s_args[i]); 442 memset(&t->cs, 0, sizeof(t->cs)); 443 t->in_syscall = 0; 444 } 445 446 static void 447 enter_syscall(struct trussinfo *info, struct threadinfo *t, 448 struct ptrace_lwpinfo *pl) 449 { 450 struct syscall *sc; 451 u_int i, narg; 452 453 alloc_syscall(t, pl); 454 narg = MIN(pl->pl_syscall_narg, nitems(t->cs.args)); 455 if (narg != 0 && ptrace(PT_GET_SC_ARGS, t->tid, (caddr_t)t->cs.args, 456 sizeof(t->cs.args)) != 0) { 457 free_syscall(t); 458 return; 459 } 460 461 sc = get_syscall(t, t->cs.number, narg); 462 if (sc->unknown) 463 fprintf(info->outfile, "-- UNKNOWN %s SYSCALL %d --\n", 464 t->proc->abi->type, t->cs.number); 465 466 t->cs.nargs = sc->nargs; 467 assert(sc->nargs <= nitems(t->cs.s_args)); 468 469 t->cs.sc = sc; 470 471 /* 472 * At this point, we set up the system call arguments. 473 * We ignore any OUT ones, however -- those are arguments that 474 * are set by the system call, and so are probably meaningless 475 * now. This doesn't currently support arguments that are 476 * passed in *and* out, however. 477 */ 478 #if DEBUG 479 fprintf(stderr, "syscall %s(", sc->name); 480 #endif 481 for (i = 0; i < t->cs.nargs; i++) { 482 #if DEBUG 483 fprintf(stderr, "0x%lx%s", t->cs.args[sc->args[i].offset], 484 i < (t->cs.nargs - 1) ? "," : ""); 485 #endif 486 if (!(sc->args[i].type & OUT)) { 487 t->cs.s_args[i] = print_arg(&sc->args[i], 488 t->cs.args, NULL, info); 489 } 490 } 491 #if DEBUG 492 fprintf(stderr, ")\n"); 493 #endif 494 495 clock_gettime(CLOCK_REALTIME, &t->before); 496 } 497 498 /* 499 * When a thread exits voluntarily (including when a thread calls 500 * exit() to trigger a process exit), the thread's internal state 501 * holds the arguments passed to the exit system call. When the 502 * thread's exit is reported, log that system call without a return 503 * value. 504 */ 505 static void 506 thread_exit_syscall(struct trussinfo *info) 507 { 508 struct threadinfo *t; 509 510 t = info->curthread; 511 if (!t->in_syscall) 512 return; 513 514 clock_gettime(CLOCK_REALTIME, &t->after); 515 516 print_syscall_ret(info, 0, NULL); 517 free_syscall(t); 518 } 519 520 static void 521 exit_syscall(struct trussinfo *info, struct ptrace_lwpinfo *pl) 522 { 523 struct threadinfo *t; 524 struct procinfo *p; 525 struct syscall *sc; 526 struct ptrace_sc_ret psr; 527 u_int i; 528 529 t = info->curthread; 530 if (!t->in_syscall) 531 return; 532 533 clock_gettime(CLOCK_REALTIME, &t->after); 534 p = t->proc; 535 if (ptrace(PT_GET_SC_RET, t->tid, (caddr_t)&psr, sizeof(psr)) != 0) { 536 free_syscall(t); 537 return; 538 } 539 540 sc = t->cs.sc; 541 /* 542 * Here, we only look for arguments that have OUT masked in -- 543 * otherwise, they were handled in enter_syscall(). 544 */ 545 for (i = 0; i < sc->nargs; i++) { 546 char *temp; 547 548 if (sc->args[i].type & OUT) { 549 /* 550 * If an error occurred, then don't bother 551 * getting the data; it may not be valid. 552 */ 553 if (psr.sr_error != 0) { 554 asprintf(&temp, "0x%lx", 555 t->cs.args[sc->args[i].offset]); 556 } else { 557 temp = print_arg(&sc->args[i], 558 t->cs.args, psr.sr_retval, info); 559 } 560 t->cs.s_args[i] = temp; 561 } 562 } 563 564 print_syscall_ret(info, psr.sr_error, psr.sr_retval); 565 free_syscall(t); 566 567 /* 568 * If the process executed a new image, check the ABI. If the 569 * new ABI isn't supported, stop tracing this process. 570 */ 571 if (pl->pl_flags & PL_FLAG_EXEC) { 572 assert(LIST_NEXT(LIST_FIRST(&p->threadlist), entries) == NULL); 573 p->abi = find_abi(p->pid); 574 if (p->abi == NULL) { 575 if (ptrace(PT_DETACH, p->pid, (caddr_t)1, 0) < 0) 576 err(1, "Can not detach the process"); 577 free_proc(p); 578 } 579 } 580 } 581 582 int 583 print_line_prefix(struct trussinfo *info) 584 { 585 struct timespec timediff; 586 struct threadinfo *t; 587 int len; 588 589 len = 0; 590 t = info->curthread; 591 if (info->flags & (FOLLOWFORKS | DISPLAYTIDS)) { 592 if (info->flags & FOLLOWFORKS) 593 len += fprintf(info->outfile, "%5d", t->proc->pid); 594 if ((info->flags & (FOLLOWFORKS | DISPLAYTIDS)) == 595 (FOLLOWFORKS | DISPLAYTIDS)) 596 len += fprintf(info->outfile, " "); 597 if (info->flags & DISPLAYTIDS) 598 len += fprintf(info->outfile, "%6d", t->tid); 599 len += fprintf(info->outfile, ": "); 600 } 601 if (info->flags & ABSOLUTETIMESTAMPS) { 602 timespecsub(&t->after, &info->start_time, &timediff); 603 len += fprintf(info->outfile, "%jd.%09ld ", 604 (intmax_t)timediff.tv_sec, timediff.tv_nsec); 605 } 606 if (info->flags & RELATIVETIMESTAMPS) { 607 timespecsub(&t->after, &t->before, &timediff); 608 len += fprintf(info->outfile, "%jd.%09ld ", 609 (intmax_t)timediff.tv_sec, timediff.tv_nsec); 610 } 611 return (len); 612 } 613 614 static void 615 report_thread_death(struct trussinfo *info) 616 { 617 struct threadinfo *t; 618 619 t = info->curthread; 620 clock_gettime(CLOCK_REALTIME, &t->after); 621 print_line_prefix(info); 622 fprintf(info->outfile, "<thread %ld exited>\n", (long)t->tid); 623 } 624 625 static void 626 report_thread_birth(struct trussinfo *info) 627 { 628 struct threadinfo *t; 629 630 t = info->curthread; 631 clock_gettime(CLOCK_REALTIME, &t->after); 632 t->before = t->after; 633 print_line_prefix(info); 634 fprintf(info->outfile, "<new thread %ld>\n", (long)t->tid); 635 } 636 637 static void 638 report_exit(struct trussinfo *info, siginfo_t *si) 639 { 640 struct threadinfo *t; 641 642 t = info->curthread; 643 clock_gettime(CLOCK_REALTIME, &t->after); 644 print_line_prefix(info); 645 if (si->si_code == CLD_EXITED) 646 fprintf(info->outfile, "process exit, rval = %u\n", 647 si->si_status); 648 else 649 fprintf(info->outfile, "process killed, signal = %u%s\n", 650 si->si_status, si->si_code == CLD_DUMPED ? 651 " (core dumped)" : ""); 652 } 653 654 static void 655 report_new_child(struct trussinfo *info) 656 { 657 struct threadinfo *t; 658 659 t = info->curthread; 660 clock_gettime(CLOCK_REALTIME, &t->after); 661 t->before = t->after; 662 print_line_prefix(info); 663 fprintf(info->outfile, "<new process>\n"); 664 } 665 666 void 667 decode_siginfo(FILE *fp, siginfo_t *si) 668 { 669 const char *str; 670 671 fprintf(fp, " code="); 672 str = sysdecode_sigcode(si->si_signo, si->si_code); 673 if (str == NULL) 674 fprintf(fp, "%d", si->si_code); 675 else 676 fprintf(fp, "%s", str); 677 switch (si->si_code) { 678 case SI_NOINFO: 679 break; 680 case SI_QUEUE: 681 fprintf(fp, " value=%p", si->si_value.sival_ptr); 682 /* FALLTHROUGH */ 683 case SI_USER: 684 case SI_LWP: 685 fprintf(fp, " pid=%jd uid=%jd", (intmax_t)si->si_pid, 686 (intmax_t)si->si_uid); 687 break; 688 case SI_TIMER: 689 fprintf(fp, " value=%p", si->si_value.sival_ptr); 690 fprintf(fp, " timerid=%d", si->si_timerid); 691 fprintf(fp, " overrun=%d", si->si_overrun); 692 if (si->si_errno != 0) 693 fprintf(fp, " errno=%d", si->si_errno); 694 break; 695 case SI_ASYNCIO: 696 fprintf(fp, " value=%p", si->si_value.sival_ptr); 697 break; 698 case SI_MESGQ: 699 fprintf(fp, " value=%p", si->si_value.sival_ptr); 700 fprintf(fp, " mqd=%d", si->si_mqd); 701 break; 702 default: 703 switch (si->si_signo) { 704 case SIGILL: 705 case SIGFPE: 706 case SIGSEGV: 707 case SIGBUS: 708 fprintf(fp, " trapno=%d", si->si_trapno); 709 fprintf(fp, " addr=%p", si->si_addr); 710 break; 711 case SIGCHLD: 712 fprintf(fp, " pid=%jd uid=%jd", (intmax_t)si->si_pid, 713 (intmax_t)si->si_uid); 714 fprintf(fp, " status=%d", si->si_status); 715 break; 716 } 717 } 718 } 719 720 static void 721 report_signal(struct trussinfo *info, siginfo_t *si, struct ptrace_lwpinfo *pl) 722 { 723 struct threadinfo *t; 724 const char *signame; 725 726 t = info->curthread; 727 clock_gettime(CLOCK_REALTIME, &t->after); 728 print_line_prefix(info); 729 signame = sysdecode_signal(si->si_status); 730 if (signame == NULL) 731 signame = "?"; 732 fprintf(info->outfile, "SIGNAL %u (%s)", si->si_status, signame); 733 if (pl->pl_event == PL_EVENT_SIGNAL && pl->pl_flags & PL_FLAG_SI) 734 decode_siginfo(info->outfile, &pl->pl_siginfo); 735 fprintf(info->outfile, "\n"); 736 737 } 738 739 /* 740 * Wait for events until all the processes have exited or truss has been 741 * asked to stop. 742 */ 743 void 744 eventloop(struct trussinfo *info) 745 { 746 struct ptrace_lwpinfo pl; 747 siginfo_t si; 748 int pending_signal; 749 750 while (!LIST_EMPTY(&info->proclist)) { 751 if (detaching) { 752 detach_all_procs(info); 753 return; 754 } 755 756 if (waitid(P_ALL, 0, &si, WTRAPPED | WEXITED) == -1) { 757 if (errno == EINTR) 758 continue; 759 err(1, "Unexpected error from waitid"); 760 } 761 762 assert(si.si_signo == SIGCHLD); 763 764 switch (si.si_code) { 765 case CLD_EXITED: 766 case CLD_KILLED: 767 case CLD_DUMPED: 768 find_exit_thread(info, si.si_pid); 769 if ((info->flags & COUNTONLY) == 0) { 770 if (si.si_code == CLD_EXITED) 771 thread_exit_syscall(info); 772 report_exit(info, &si); 773 } 774 free_proc(info->curthread->proc); 775 info->curthread = NULL; 776 break; 777 case CLD_TRAPPED: 778 if (ptrace(PT_LWPINFO, si.si_pid, (caddr_t)&pl, 779 sizeof(pl)) == -1) 780 err(1, "ptrace(PT_LWPINFO)"); 781 782 if (pl.pl_flags & PL_FLAG_CHILD) { 783 new_proc(info, si.si_pid, pl.pl_lwpid); 784 assert(LIST_FIRST(&info->proclist)->abi != 785 NULL); 786 } else if (pl.pl_flags & PL_FLAG_BORN) 787 new_thread(find_proc(info, si.si_pid), 788 pl.pl_lwpid); 789 find_thread(info, si.si_pid, pl.pl_lwpid); 790 791 if (si.si_status == SIGTRAP && 792 (pl.pl_flags & (PL_FLAG_BORN|PL_FLAG_EXITED| 793 PL_FLAG_SCE|PL_FLAG_SCX)) != 0) { 794 if (pl.pl_flags & PL_FLAG_BORN) { 795 if ((info->flags & COUNTONLY) == 0) 796 report_thread_birth(info); 797 } else if (pl.pl_flags & PL_FLAG_EXITED) { 798 if ((info->flags & COUNTONLY) == 0) 799 report_thread_death(info); 800 free_thread(info->curthread); 801 info->curthread = NULL; 802 } else if (pl.pl_flags & PL_FLAG_SCE) 803 enter_syscall(info, info->curthread, &pl); 804 else if (pl.pl_flags & PL_FLAG_SCX) 805 exit_syscall(info, &pl); 806 pending_signal = 0; 807 } else if (pl.pl_flags & PL_FLAG_CHILD) { 808 if ((info->flags & COUNTONLY) == 0) 809 report_new_child(info); 810 pending_signal = 0; 811 } else { 812 if ((info->flags & NOSIGS) == 0) 813 report_signal(info, &si, &pl); 814 pending_signal = si.si_status; 815 } 816 ptrace(PT_SYSCALL, si.si_pid, (caddr_t)1, 817 pending_signal); 818 break; 819 case CLD_STOPPED: 820 errx(1, "waitid reported CLD_STOPPED"); 821 case CLD_CONTINUED: 822 break; 823 } 824 } 825 } 826