1 /* 2 * os-posix-lib.c 3 * 4 * Copyright (c) 2003-2008 Fabrice Bellard 5 * Copyright (c) 2010 Red Hat, Inc. 6 * 7 * QEMU library functions on POSIX which are shared between QEMU and 8 * the QEMU tools. 9 * 10 * Permission is hereby granted, free of charge, to any person obtaining a copy 11 * of this software and associated documentation files (the "Software"), to deal 12 * in the Software without restriction, including without limitation the rights 13 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 14 * copies of the Software, and to permit persons to whom the Software is 15 * furnished to do so, subject to the following conditions: 16 * 17 * The above copyright notice and this permission notice shall be included in 18 * all copies or substantial portions of the Software. 19 * 20 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 21 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 22 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 23 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 24 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 25 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN 26 * THE SOFTWARE. 27 */ 28 29 #include "qemu/osdep.h" 30 #include <termios.h> 31 32 #include <glib/gprintf.h> 33 34 #include "qemu-common.h" 35 #include "sysemu/sysemu.h" 36 #include "trace.h" 37 #include "qapi/error.h" 38 #include "qemu/sockets.h" 39 #include "qemu/thread.h" 40 #include <libgen.h> 41 #include <sys/signal.h> 42 #include "qemu/cutils.h" 43 44 #ifdef CONFIG_LINUX 45 #include <sys/syscall.h> 46 #endif 47 48 #ifdef __FreeBSD__ 49 #include <sys/sysctl.h> 50 #include <sys/user.h> 51 #include <sys/thr.h> 52 #include <libutil.h> 53 #endif 54 55 #ifdef __NetBSD__ 56 #include <sys/sysctl.h> 57 #include <lwp.h> 58 #endif 59 60 #ifdef __APPLE__ 61 #include <mach-o/dyld.h> 62 #endif 63 64 #include "qemu/mmap-alloc.h" 65 66 #ifdef CONFIG_DEBUG_STACK_USAGE 67 #include "qemu/error-report.h" 68 #endif 69 70 #define MAX_MEM_PREALLOC_THREAD_COUNT 16 71 72 struct MemsetThread { 73 char *addr; 74 size_t numpages; 75 size_t hpagesize; 76 QemuThread pgthread; 77 sigjmp_buf env; 78 }; 79 typedef struct MemsetThread MemsetThread; 80 81 static MemsetThread *memset_thread; 82 static int memset_num_threads; 83 static bool memset_thread_failed; 84 85 static QemuMutex page_mutex; 86 static QemuCond page_cond; 87 static bool threads_created_flag; 88 89 int qemu_get_thread_id(void) 90 { 91 #if defined(__linux__) 92 return syscall(SYS_gettid); 93 #elif defined(__FreeBSD__) 94 /* thread id is up to INT_MAX */ 95 long tid; 96 thr_self(&tid); 97 return (int)tid; 98 #elif defined(__NetBSD__) 99 return _lwp_self(); 100 #else 101 return getpid(); 102 #endif 103 } 104 105 int qemu_daemon(int nochdir, int noclose) 106 { 107 return daemon(nochdir, noclose); 108 } 109 110 bool qemu_write_pidfile(const char *path, Error **errp) 111 { 112 int fd; 113 char pidstr[32]; 114 115 while (1) { 116 struct stat a, b; 117 struct flock lock = { 118 .l_type = F_WRLCK, 119 .l_whence = SEEK_SET, 120 .l_len = 0, 121 }; 122 123 fd = qemu_open(path, O_CREAT | O_WRONLY, S_IRUSR | S_IWUSR); 124 if (fd == -1) { 125 error_setg_errno(errp, errno, "Cannot open pid file"); 126 return false; 127 } 128 129 if (fstat(fd, &b) < 0) { 130 error_setg_errno(errp, errno, "Cannot stat file"); 131 goto fail_close; 132 } 133 134 if (fcntl(fd, F_SETLK, &lock)) { 135 error_setg_errno(errp, errno, "Cannot lock pid file"); 136 goto fail_close; 137 } 138 139 /* 140 * Now make sure the path we locked is the same one that now 141 * exists on the filesystem. 142 */ 143 if (stat(path, &a) < 0) { 144 /* 145 * PID file disappeared, someone else must be racing with 146 * us, so try again. 147 */ 148 close(fd); 149 continue; 150 } 151 152 if (a.st_ino == b.st_ino) { 153 break; 154 } 155 156 /* 157 * PID file was recreated, someone else must be racing with 158 * us, so try again. 159 */ 160 close(fd); 161 } 162 163 if (ftruncate(fd, 0) < 0) { 164 error_setg_errno(errp, errno, "Failed to truncate pid file"); 165 goto fail_unlink; 166 } 167 168 snprintf(pidstr, sizeof(pidstr), FMT_pid "\n", getpid()); 169 if (write(fd, pidstr, strlen(pidstr)) != strlen(pidstr)) { 170 error_setg(errp, "Failed to write pid file"); 171 goto fail_unlink; 172 } 173 174 return true; 175 176 fail_unlink: 177 unlink(path); 178 fail_close: 179 close(fd); 180 return false; 181 } 182 183 void *qemu_oom_check(void *ptr) 184 { 185 if (ptr == NULL) { 186 fprintf(stderr, "Failed to allocate memory: %s\n", strerror(errno)); 187 abort(); 188 } 189 return ptr; 190 } 191 192 void *qemu_try_memalign(size_t alignment, size_t size) 193 { 194 void *ptr; 195 196 if (alignment < sizeof(void*)) { 197 alignment = sizeof(void*); 198 } 199 200 #if defined(CONFIG_POSIX_MEMALIGN) 201 int ret; 202 ret = posix_memalign(&ptr, alignment, size); 203 if (ret != 0) { 204 errno = ret; 205 ptr = NULL; 206 } 207 #elif defined(CONFIG_BSD) 208 ptr = valloc(size); 209 #else 210 ptr = memalign(alignment, size); 211 #endif 212 trace_qemu_memalign(alignment, size, ptr); 213 return ptr; 214 } 215 216 void *qemu_memalign(size_t alignment, size_t size) 217 { 218 return qemu_oom_check(qemu_try_memalign(alignment, size)); 219 } 220 221 /* alloc shared memory pages */ 222 void *qemu_anon_ram_alloc(size_t size, uint64_t *alignment, bool shared) 223 { 224 size_t align = QEMU_VMALLOC_ALIGN; 225 void *ptr = qemu_ram_mmap(-1, size, align, shared, false); 226 227 if (ptr == MAP_FAILED) { 228 return NULL; 229 } 230 231 if (alignment) { 232 *alignment = align; 233 } 234 235 trace_qemu_anon_ram_alloc(size, ptr); 236 return ptr; 237 } 238 239 void qemu_vfree(void *ptr) 240 { 241 trace_qemu_vfree(ptr); 242 free(ptr); 243 } 244 245 void qemu_anon_ram_free(void *ptr, size_t size) 246 { 247 trace_qemu_anon_ram_free(ptr, size); 248 qemu_ram_munmap(-1, ptr, size); 249 } 250 251 void qemu_set_block(int fd) 252 { 253 int f; 254 f = fcntl(fd, F_GETFL); 255 assert(f != -1); 256 f = fcntl(fd, F_SETFL, f & ~O_NONBLOCK); 257 assert(f != -1); 258 } 259 260 void qemu_set_nonblock(int fd) 261 { 262 int f; 263 f = fcntl(fd, F_GETFL); 264 assert(f != -1); 265 f = fcntl(fd, F_SETFL, f | O_NONBLOCK); 266 #ifdef __OpenBSD__ 267 if (f == -1) { 268 /* 269 * Previous to OpenBSD 6.3, fcntl(F_SETFL) is not permitted on 270 * memory devices and sets errno to ENODEV. 271 * It's OK if we fail to set O_NONBLOCK on devices like /dev/null, 272 * because they will never block anyway. 273 */ 274 assert(errno == ENODEV); 275 } 276 #else 277 assert(f != -1); 278 #endif 279 } 280 281 int socket_set_fast_reuse(int fd) 282 { 283 int val = 1, ret; 284 285 ret = setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, 286 (const char *)&val, sizeof(val)); 287 288 assert(ret == 0); 289 290 return ret; 291 } 292 293 void qemu_set_cloexec(int fd) 294 { 295 int f; 296 f = fcntl(fd, F_GETFD); 297 assert(f != -1); 298 f = fcntl(fd, F_SETFD, f | FD_CLOEXEC); 299 assert(f != -1); 300 } 301 302 /* 303 * Creates a pipe with FD_CLOEXEC set on both file descriptors 304 */ 305 int qemu_pipe(int pipefd[2]) 306 { 307 int ret; 308 309 #ifdef CONFIG_PIPE2 310 ret = pipe2(pipefd, O_CLOEXEC); 311 if (ret != -1 || errno != ENOSYS) { 312 return ret; 313 } 314 #endif 315 ret = pipe(pipefd); 316 if (ret == 0) { 317 qemu_set_cloexec(pipefd[0]); 318 qemu_set_cloexec(pipefd[1]); 319 } 320 321 return ret; 322 } 323 324 char * 325 qemu_get_local_state_pathname(const char *relative_pathname) 326 { 327 return g_strdup_printf("%s/%s", CONFIG_QEMU_LOCALSTATEDIR, 328 relative_pathname); 329 } 330 331 void qemu_set_tty_echo(int fd, bool echo) 332 { 333 struct termios tty; 334 335 tcgetattr(fd, &tty); 336 337 if (echo) { 338 tty.c_lflag |= ECHO | ECHONL | ICANON | IEXTEN; 339 } else { 340 tty.c_lflag &= ~(ECHO | ECHONL | ICANON | IEXTEN); 341 } 342 343 tcsetattr(fd, TCSANOW, &tty); 344 } 345 346 static char exec_dir[PATH_MAX]; 347 348 void qemu_init_exec_dir(const char *argv0) 349 { 350 char *dir; 351 char *p = NULL; 352 char buf[PATH_MAX]; 353 354 assert(!exec_dir[0]); 355 356 #if defined(__linux__) 357 { 358 int len; 359 len = readlink("/proc/self/exe", buf, sizeof(buf) - 1); 360 if (len > 0) { 361 buf[len] = 0; 362 p = buf; 363 } 364 } 365 #elif defined(__FreeBSD__) \ 366 || (defined(__NetBSD__) && defined(KERN_PROC_PATHNAME)) 367 { 368 #if defined(__FreeBSD__) 369 static int mib[4] = {CTL_KERN, KERN_PROC, KERN_PROC_PATHNAME, -1}; 370 #else 371 static int mib[4] = {CTL_KERN, KERN_PROC_ARGS, -1, KERN_PROC_PATHNAME}; 372 #endif 373 size_t len = sizeof(buf) - 1; 374 375 *buf = '\0'; 376 if (!sysctl(mib, ARRAY_SIZE(mib), buf, &len, NULL, 0) && 377 *buf) { 378 buf[sizeof(buf) - 1] = '\0'; 379 p = buf; 380 } 381 } 382 #elif defined(__APPLE__) 383 { 384 char fpath[PATH_MAX]; 385 uint32_t len = sizeof(fpath); 386 if (_NSGetExecutablePath(fpath, &len) == 0) { 387 p = realpath(fpath, buf); 388 if (!p) { 389 return; 390 } 391 } 392 } 393 #endif 394 /* If we don't have any way of figuring out the actual executable 395 location then try argv[0]. */ 396 if (!p) { 397 if (!argv0) { 398 return; 399 } 400 p = realpath(argv0, buf); 401 if (!p) { 402 return; 403 } 404 } 405 dir = g_path_get_dirname(p); 406 407 pstrcpy(exec_dir, sizeof(exec_dir), dir); 408 409 g_free(dir); 410 } 411 412 char *qemu_get_exec_dir(void) 413 { 414 return g_strdup(exec_dir); 415 } 416 417 static void sigbus_handler(int signal) 418 { 419 int i; 420 if (memset_thread) { 421 for (i = 0; i < memset_num_threads; i++) { 422 if (qemu_thread_is_self(&memset_thread[i].pgthread)) { 423 siglongjmp(memset_thread[i].env, 1); 424 } 425 } 426 } 427 } 428 429 static void *do_touch_pages(void *arg) 430 { 431 MemsetThread *memset_args = (MemsetThread *)arg; 432 sigset_t set, oldset; 433 434 /* 435 * On Linux, the page faults from the loop below can cause mmap_sem 436 * contention with allocation of the thread stacks. Do not start 437 * clearing until all threads have been created. 438 */ 439 qemu_mutex_lock(&page_mutex); 440 while(!threads_created_flag){ 441 qemu_cond_wait(&page_cond, &page_mutex); 442 } 443 qemu_mutex_unlock(&page_mutex); 444 445 /* unblock SIGBUS */ 446 sigemptyset(&set); 447 sigaddset(&set, SIGBUS); 448 pthread_sigmask(SIG_UNBLOCK, &set, &oldset); 449 450 if (sigsetjmp(memset_args->env, 1)) { 451 memset_thread_failed = true; 452 } else { 453 char *addr = memset_args->addr; 454 size_t numpages = memset_args->numpages; 455 size_t hpagesize = memset_args->hpagesize; 456 size_t i; 457 for (i = 0; i < numpages; i++) { 458 /* 459 * Read & write back the same value, so we don't 460 * corrupt existing user/app data that might be 461 * stored. 462 * 463 * 'volatile' to stop compiler optimizing this away 464 * to a no-op 465 * 466 * TODO: get a better solution from kernel so we 467 * don't need to write at all so we don't cause 468 * wear on the storage backing the region... 469 */ 470 *(volatile char *)addr = *addr; 471 addr += hpagesize; 472 } 473 } 474 pthread_sigmask(SIG_SETMASK, &oldset, NULL); 475 return NULL; 476 } 477 478 static inline int get_memset_num_threads(int smp_cpus) 479 { 480 long host_procs = sysconf(_SC_NPROCESSORS_ONLN); 481 int ret = 1; 482 483 if (host_procs > 0) { 484 ret = MIN(MIN(host_procs, MAX_MEM_PREALLOC_THREAD_COUNT), smp_cpus); 485 } 486 /* In case sysconf() fails, we fall back to single threaded */ 487 return ret; 488 } 489 490 static bool touch_all_pages(char *area, size_t hpagesize, size_t numpages, 491 int smp_cpus) 492 { 493 static gsize initialized = 0; 494 size_t numpages_per_thread, leftover; 495 char *addr = area; 496 int i = 0; 497 498 if (g_once_init_enter(&initialized)) { 499 qemu_mutex_init(&page_mutex); 500 qemu_cond_init(&page_cond); 501 g_once_init_leave(&initialized, 1); 502 } 503 504 memset_thread_failed = false; 505 threads_created_flag = false; 506 memset_num_threads = get_memset_num_threads(smp_cpus); 507 memset_thread = g_new0(MemsetThread, memset_num_threads); 508 numpages_per_thread = numpages / memset_num_threads; 509 leftover = numpages % memset_num_threads; 510 for (i = 0; i < memset_num_threads; i++) { 511 memset_thread[i].addr = addr; 512 memset_thread[i].numpages = numpages_per_thread + (i < leftover); 513 memset_thread[i].hpagesize = hpagesize; 514 qemu_thread_create(&memset_thread[i].pgthread, "touch_pages", 515 do_touch_pages, &memset_thread[i], 516 QEMU_THREAD_JOINABLE); 517 addr += memset_thread[i].numpages * hpagesize; 518 } 519 520 qemu_mutex_lock(&page_mutex); 521 threads_created_flag = true; 522 qemu_cond_broadcast(&page_cond); 523 qemu_mutex_unlock(&page_mutex); 524 525 for (i = 0; i < memset_num_threads; i++) { 526 qemu_thread_join(&memset_thread[i].pgthread); 527 } 528 g_free(memset_thread); 529 memset_thread = NULL; 530 531 return memset_thread_failed; 532 } 533 534 void os_mem_prealloc(int fd, char *area, size_t memory, int smp_cpus, 535 Error **errp) 536 { 537 int ret; 538 struct sigaction act, oldact; 539 size_t hpagesize = qemu_fd_getpagesize(fd); 540 size_t numpages = DIV_ROUND_UP(memory, hpagesize); 541 542 memset(&act, 0, sizeof(act)); 543 act.sa_handler = &sigbus_handler; 544 act.sa_flags = 0; 545 546 ret = sigaction(SIGBUS, &act, &oldact); 547 if (ret) { 548 error_setg_errno(errp, errno, 549 "os_mem_prealloc: failed to install signal handler"); 550 return; 551 } 552 553 /* touch pages simultaneously */ 554 if (touch_all_pages(area, hpagesize, numpages, smp_cpus)) { 555 error_setg(errp, "os_mem_prealloc: Insufficient free host memory " 556 "pages available to allocate guest RAM"); 557 } 558 559 ret = sigaction(SIGBUS, &oldact, NULL); 560 if (ret) { 561 /* Terminate QEMU since it can't recover from error */ 562 perror("os_mem_prealloc: failed to reinstall signal handler"); 563 exit(1); 564 } 565 } 566 567 char *qemu_get_pid_name(pid_t pid) 568 { 569 char *name = NULL; 570 571 #if defined(__FreeBSD__) 572 /* BSDs don't have /proc, but they provide a nice substitute */ 573 struct kinfo_proc *proc = kinfo_getproc(pid); 574 575 if (proc) { 576 name = g_strdup(proc->ki_comm); 577 free(proc); 578 } 579 #else 580 /* Assume a system with reasonable procfs */ 581 char *pid_path; 582 size_t len; 583 584 pid_path = g_strdup_printf("/proc/%d/cmdline", pid); 585 g_file_get_contents(pid_path, &name, &len, NULL); 586 g_free(pid_path); 587 #endif 588 589 return name; 590 } 591 592 593 pid_t qemu_fork(Error **errp) 594 { 595 sigset_t oldmask, newmask; 596 struct sigaction sig_action; 597 int saved_errno; 598 pid_t pid; 599 600 /* 601 * Need to block signals now, so that child process can safely 602 * kill off caller's signal handlers without a race. 603 */ 604 sigfillset(&newmask); 605 if (pthread_sigmask(SIG_SETMASK, &newmask, &oldmask) != 0) { 606 error_setg_errno(errp, errno, 607 "cannot block signals"); 608 return -1; 609 } 610 611 pid = fork(); 612 saved_errno = errno; 613 614 if (pid < 0) { 615 /* attempt to restore signal mask, but ignore failure, to 616 * avoid obscuring the fork failure */ 617 (void)pthread_sigmask(SIG_SETMASK, &oldmask, NULL); 618 error_setg_errno(errp, saved_errno, 619 "cannot fork child process"); 620 errno = saved_errno; 621 return -1; 622 } else if (pid) { 623 /* parent process */ 624 625 /* Restore our original signal mask now that the child is 626 * safely running. Only documented failures are EFAULT (not 627 * possible, since we are using just-grabbed mask) or EINVAL 628 * (not possible, since we are using correct arguments). */ 629 (void)pthread_sigmask(SIG_SETMASK, &oldmask, NULL); 630 } else { 631 /* child process */ 632 size_t i; 633 634 /* Clear out all signal handlers from parent so nothing 635 * unexpected can happen in our child once we unblock 636 * signals */ 637 sig_action.sa_handler = SIG_DFL; 638 sig_action.sa_flags = 0; 639 sigemptyset(&sig_action.sa_mask); 640 641 for (i = 1; i < NSIG; i++) { 642 /* Only possible errors are EFAULT or EINVAL The former 643 * won't happen, the latter we expect, so no need to check 644 * return value */ 645 (void)sigaction(i, &sig_action, NULL); 646 } 647 648 /* Unmask all signals in child, since we've no idea what the 649 * caller's done with their signal mask and don't want to 650 * propagate that to children */ 651 sigemptyset(&newmask); 652 if (pthread_sigmask(SIG_SETMASK, &newmask, NULL) != 0) { 653 Error *local_err = NULL; 654 error_setg_errno(&local_err, errno, 655 "cannot unblock signals"); 656 error_report_err(local_err); 657 _exit(1); 658 } 659 } 660 return pid; 661 } 662 663 void *qemu_alloc_stack(size_t *sz) 664 { 665 void *ptr, *guardpage; 666 int flags; 667 #ifdef CONFIG_DEBUG_STACK_USAGE 668 void *ptr2; 669 #endif 670 size_t pagesz = qemu_real_host_page_size; 671 #ifdef _SC_THREAD_STACK_MIN 672 /* avoid stacks smaller than _SC_THREAD_STACK_MIN */ 673 long min_stack_sz = sysconf(_SC_THREAD_STACK_MIN); 674 *sz = MAX(MAX(min_stack_sz, 0), *sz); 675 #endif 676 /* adjust stack size to a multiple of the page size */ 677 *sz = ROUND_UP(*sz, pagesz); 678 /* allocate one extra page for the guard page */ 679 *sz += pagesz; 680 681 flags = MAP_PRIVATE | MAP_ANONYMOUS; 682 #if defined(MAP_STACK) && defined(__OpenBSD__) 683 /* Only enable MAP_STACK on OpenBSD. Other OS's such as 684 * Linux/FreeBSD/NetBSD have a flag with the same name 685 * but have differing functionality. OpenBSD will SEGV 686 * if it spots execution with a stack pointer pointing 687 * at memory that was not allocated with MAP_STACK. 688 */ 689 flags |= MAP_STACK; 690 #endif 691 692 ptr = mmap(NULL, *sz, PROT_READ | PROT_WRITE, flags, -1, 0); 693 if (ptr == MAP_FAILED) { 694 perror("failed to allocate memory for stack"); 695 abort(); 696 } 697 698 #if defined(HOST_IA64) 699 /* separate register stack */ 700 guardpage = ptr + (((*sz - pagesz) / 2) & ~pagesz); 701 #elif defined(HOST_HPPA) 702 /* stack grows up */ 703 guardpage = ptr + *sz - pagesz; 704 #else 705 /* stack grows down */ 706 guardpage = ptr; 707 #endif 708 if (mprotect(guardpage, pagesz, PROT_NONE) != 0) { 709 perror("failed to set up stack guard page"); 710 abort(); 711 } 712 713 #ifdef CONFIG_DEBUG_STACK_USAGE 714 for (ptr2 = ptr + pagesz; ptr2 < ptr + *sz; ptr2 += sizeof(uint32_t)) { 715 *(uint32_t *)ptr2 = 0xdeadbeaf; 716 } 717 #endif 718 719 return ptr; 720 } 721 722 #ifdef CONFIG_DEBUG_STACK_USAGE 723 static __thread unsigned int max_stack_usage; 724 #endif 725 726 void qemu_free_stack(void *stack, size_t sz) 727 { 728 #ifdef CONFIG_DEBUG_STACK_USAGE 729 unsigned int usage; 730 void *ptr; 731 732 for (ptr = stack + qemu_real_host_page_size; ptr < stack + sz; 733 ptr += sizeof(uint32_t)) { 734 if (*(uint32_t *)ptr != 0xdeadbeaf) { 735 break; 736 } 737 } 738 usage = sz - (uintptr_t) (ptr - stack); 739 if (usage > max_stack_usage) { 740 error_report("thread %d max stack usage increased from %u to %u", 741 qemu_get_thread_id(), max_stack_usage, usage); 742 max_stack_usage = usage; 743 } 744 #endif 745 746 munmap(stack, sz); 747 } 748 749 void sigaction_invoke(struct sigaction *action, 750 struct qemu_signalfd_siginfo *info) 751 { 752 siginfo_t si = {}; 753 si.si_signo = info->ssi_signo; 754 si.si_errno = info->ssi_errno; 755 si.si_code = info->ssi_code; 756 757 /* Convert the minimal set of fields defined by POSIX. 758 * Positive si_code values are reserved for kernel-generated 759 * signals, where the valid siginfo fields are determined by 760 * the signal number. But according to POSIX, it is unspecified 761 * whether SI_USER and SI_QUEUE have values less than or equal to 762 * zero. 763 */ 764 if (info->ssi_code == SI_USER || info->ssi_code == SI_QUEUE || 765 info->ssi_code <= 0) { 766 /* SIGTERM, etc. */ 767 si.si_pid = info->ssi_pid; 768 si.si_uid = info->ssi_uid; 769 } else if (info->ssi_signo == SIGILL || info->ssi_signo == SIGFPE || 770 info->ssi_signo == SIGSEGV || info->ssi_signo == SIGBUS) { 771 si.si_addr = (void *)(uintptr_t)info->ssi_addr; 772 } else if (info->ssi_signo == SIGCHLD) { 773 si.si_pid = info->ssi_pid; 774 si.si_status = info->ssi_status; 775 si.si_uid = info->ssi_uid; 776 } 777 action->sa_sigaction(info->ssi_signo, &si, NULL); 778 } 779