1 /* 2 * Copyright (c) 1991, 1992 Paul Kranenburg <pk (at) cs.few.eur.nl> 3 * Copyright (c) 1993 Branko Lankester <branko (at) hacktic.nl> 4 * Copyright (c) 1993, 1994, 1995, 1996 Rick Sladkey <jrs (at) world.std.com> 5 * Copyright (c) 1996-1999 Wichert Akkerman <wichert (at) cistron.nl> 6 * Copyright (c) 1999 IBM Deutschland Entwicklung GmbH, IBM Corporation 7 * Linux for s390 port by D.J. Barrow 8 * <barrow_dj (at) mail.yahoo.com,djbarrow (at) de.ibm.com> 9 * Copyright (c) 2001-2017 The strace developers. 10 * All rights reserved. 11 * 12 * Redistribution and use in source and binary forms, with or without 13 * modification, are permitted provided that the following conditions 14 * are met: 15 * 1. Redistributions of source code must retain the above copyright 16 * notice, this list of conditions and the following disclaimer. 17 * 2. Redistributions in binary form must reproduce the above copyright 18 * notice, this list of conditions and the following disclaimer in the 19 * documentation and/or other materials provided with the distribution. 20 * 3. The name of the author may not be used to endorse or promote products 21 * derived from this software without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 24 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 25 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 26 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 27 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 28 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 29 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 30 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 31 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 32 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 33 */ 34 35 #include "defs.h" 36 #include "nsig.h" 37 38 /* The libc headers do not define this constant since it should only be 39 used by the implementation. So we define it here. */ 40 #ifndef SA_RESTORER 41 # ifdef ASM_SA_RESTORER 42 # define SA_RESTORER ASM_SA_RESTORER 43 # endif 44 #endif 45 46 /* 47 * Some architectures define SA_RESTORER in their headers, 48 * but do not actually have sa_restorer. 49 * 50 * Some architectures, otherwise, do not define SA_RESTORER in their headers, 51 * but actually have sa_restorer. 52 */ 53 #ifdef SA_RESTORER 54 # if defined HPPA || defined IA64 55 # define HAVE_SA_RESTORER 0 56 # else 57 # define HAVE_SA_RESTORER 1 58 # endif 59 #else /* !SA_RESTORER */ 60 # if defined SPARC || defined SPARC64 || defined M68K 61 # define HAVE_SA_RESTORER 1 62 # else 63 # define HAVE_SA_RESTORER 0 64 # endif 65 #endif 66 67 #include "xlat/sa_handler_values.h" 68 #include "xlat/sigact_flags.h" 69 #include "xlat/sigprocmaskcmds.h" 70 71 /* Anonymous realtime signals. */ 72 #ifndef ASM_SIGRTMIN 73 /* Linux kernel >= 3.18 defines SIGRTMIN to 32 on all architectures. */ 74 # define ASM_SIGRTMIN 32 75 #endif 76 #ifndef ASM_SIGRTMAX 77 /* Under glibc 2.1, SIGRTMAX et al are functions, but __SIGRTMAX is a 78 constant. This is what we want. Otherwise, just use SIGRTMAX. */ 79 # ifdef SIGRTMAX 80 # ifndef __SIGRTMAX 81 # define __SIGRTMAX SIGRTMAX 82 # endif 83 # endif 84 # ifdef __SIGRTMAX 85 # define ASM_SIGRTMAX __SIGRTMAX 86 # endif 87 #endif 88 89 /* Note on the size of sigset_t: 90 * 91 * In glibc, sigset_t is an array with space for 1024 bits (!), 92 * even though all arches supported by Linux have only 64 signals 93 * except MIPS, which has 128. IOW, it is 128 bytes long. 94 * 95 * In-kernel sigset_t is sized correctly (it is either 64 or 128 bit long). 96 * However, some old syscall return only 32 lower bits (one word). 97 * Example: sys_sigpending vs sys_rt_sigpending. 98 * 99 * Be aware of this fact when you try to 100 * memcpy(&tcp->u_arg[1], &something, sizeof(sigset_t)) 101 * - sizeof(sigset_t) is much bigger than you think, 102 * it may overflow tcp->u_arg[] array, and it may try to copy more data 103 * than is really available in <something>. 104 * Similarly, 105 * umoven(tcp, addr, sizeof(sigset_t), &sigset) 106 * may be a bad idea: it'll try to read much more data than needed 107 * to fetch a sigset_t. 108 * Use NSIG_BYTES as a size instead. 109 */ 110 111 static const char * 112 get_sa_handler_str(kernel_ulong_t handler) 113 { 114 return xlookup(sa_handler_values, handler); 115 } 116 117 static void 118 print_sa_handler(kernel_ulong_t handler) 119 { 120 const char *sa_handler_str = get_sa_handler_str(handler); 121 122 if (sa_handler_str) 123 tprints(sa_handler_str); 124 else 125 printaddr(handler); 126 } 127 128 const char * 129 signame(const int sig) 130 { 131 static char buf[sizeof("SIGRT_%u") + sizeof(int)*3]; 132 133 if (sig >= 0) { 134 const unsigned int s = sig; 135 136 if (s < nsignals) 137 return signalent[s]; 138 #ifdef ASM_SIGRTMAX 139 if (s >= ASM_SIGRTMIN && s <= (unsigned int) ASM_SIGRTMAX) { 140 sprintf(buf, "SIGRT_%u", s - ASM_SIGRTMIN); 141 return buf; 142 } 143 #endif 144 } 145 sprintf(buf, "%d", sig); 146 return buf; 147 } 148 149 static unsigned int 150 popcount32(const uint32_t *a, unsigned int size) 151 { 152 unsigned int count = 0; 153 154 for (; size; ++a, --size) { 155 uint32_t x = *a; 156 157 #ifdef HAVE___BUILTIN_POPCOUNT 158 count += __builtin_popcount(x); 159 #else 160 for (; x; ++count) 161 x &= x - 1; 162 #endif 163 } 164 165 return count; 166 } 167 168 const char * 169 sprintsigmask_n(const char *prefix, const void *sig_mask, unsigned int bytes) 170 { 171 /* 172 * The maximum number of signal names to be printed 173 * is NSIG_BYTES * 8 * 2 / 3. 174 * Most of signal names have length 7, 175 * average length of signal names is less than 7. 176 * The length of prefix string does not exceed 16. 177 */ 178 static char outstr[128 + 8 * (NSIG_BYTES * 8 * 2 / 3)]; 179 180 char *s; 181 const uint32_t *mask; 182 uint32_t inverted_mask[NSIG_BYTES / 4]; 183 unsigned int size; 184 int i; 185 char sep; 186 187 s = stpcpy(outstr, prefix); 188 189 mask = sig_mask; 190 /* length of signal mask in 4-byte words */ 191 size = (bytes >= NSIG_BYTES) ? NSIG_BYTES / 4 : (bytes + 3) / 4; 192 193 /* check whether 2/3 or more bits are set */ 194 if (popcount32(mask, size) >= size * (4 * 8) * 2 / 3) { 195 /* show those signals that are NOT in the mask */ 196 unsigned int j; 197 for (j = 0; j < size; ++j) 198 inverted_mask[j] = ~mask[j]; 199 mask = inverted_mask; 200 *s++ = '~'; 201 } 202 203 sep = '['; 204 for (i = 0; (i = next_set_bit(mask, i, size * (4 * 8))) >= 0; ) { 205 ++i; 206 *s++ = sep; 207 if ((unsigned) i < nsignals) { 208 s = stpcpy(s, signalent[i] + 3); 209 } 210 #ifdef ASM_SIGRTMAX 211 else if (i >= ASM_SIGRTMIN && i <= ASM_SIGRTMAX) { 212 s += sprintf(s, "RT_%u", i - ASM_SIGRTMIN); 213 } 214 #endif 215 else { 216 s += sprintf(s, "%u", i); 217 } 218 sep = ' '; 219 } 220 if (sep == '[') 221 *s++ = sep; 222 *s++ = ']'; 223 *s = '\0'; 224 return outstr; 225 } 226 227 #define sprintsigmask_val(prefix, mask) \ 228 sprintsigmask_n((prefix), &(mask), sizeof(mask)) 229 230 #define tprintsigmask_val(prefix, mask) \ 231 tprints(sprintsigmask_n((prefix), &(mask), sizeof(mask))) 232 233 static const char * 234 sprint_old_sigmask_val(const char *const prefix, const unsigned long mask) 235 { 236 #if defined(current_wordsize) || !defined(WORDS_BIGENDIAN) 237 return sprintsigmask_n(prefix, &mask, current_wordsize); 238 #else /* !current_wordsize && WORDS_BIGENDIAN */ 239 if (current_wordsize == sizeof(mask)) { 240 return sprintsigmask_val(prefix, mask); 241 } else { 242 uint32_t mask32 = mask; 243 return sprintsigmask_val(prefix, mask32); 244 } 245 #endif 246 } 247 248 #define tprint_old_sigmask_val(prefix, mask) \ 249 tprints(sprint_old_sigmask_val((prefix), (mask))) 250 251 void 252 printsignal(int nr) 253 { 254 tprints(signame(nr)); 255 } 256 257 static void 258 print_sigset_addr_len_limit(struct tcb *const tcp, const kernel_ulong_t addr, 259 const kernel_ulong_t len, const unsigned int min_len) 260 { 261 /* 262 * Here len is usually equal to NSIG_BYTES or current_wordsize. 263 * But we code this defensively: 264 */ 265 if (len < min_len || len > NSIG_BYTES) { 266 printaddr(addr); 267 return; 268 } 269 int mask[NSIG_BYTES / sizeof(int)] = {}; 270 if (umoven_or_printaddr(tcp, addr, len, mask)) 271 return; 272 tprints(sprintsigmask_n("", mask, len)); 273 } 274 275 void 276 print_sigset_addr_len(struct tcb *const tcp, const kernel_ulong_t addr, 277 const kernel_ulong_t len) 278 { 279 print_sigset_addr_len_limit(tcp, addr, len, current_wordsize); 280 } 281 282 void 283 print_sigset_addr(struct tcb *const tcp, const kernel_ulong_t addr) 284 { 285 print_sigset_addr_len_limit(tcp, addr, NSIG_BYTES, NSIG_BYTES); 286 } 287 288 SYS_FUNC(ssetmask) 289 { 290 if (entering(tcp)) { 291 tprint_old_sigmask_val("", (unsigned) tcp->u_arg[0]); 292 } else if (!syserror(tcp)) { 293 tcp->auxstr = sprint_old_sigmask_val("old mask ", 294 (unsigned) tcp->u_rval); 295 return RVAL_HEX | RVAL_STR; 296 } 297 return 0; 298 } 299 300 struct old_sigaction { 301 /* sa_handler may be a libc #define, need to use other name: */ 302 #if defined MIPS 303 unsigned int sa_flags; 304 unsigned long sa_handler__; 305 unsigned long sa_mask; 306 #elif defined ALPHA 307 unsigned long sa_handler__; 308 unsigned long sa_mask; 309 unsigned int sa_flags; 310 #else 311 unsigned long sa_handler__; 312 unsigned long sa_mask; 313 unsigned long sa_flags; 314 unsigned long sa_restorer; 315 #endif 316 } 317 #ifdef ALPHA 318 ATTRIBUTE_PACKED 319 #endif 320 ; 321 322 static void 323 decode_old_sigaction(struct tcb *const tcp, const kernel_ulong_t addr) 324 { 325 struct old_sigaction sa; 326 327 #ifndef current_wordsize 328 if (current_wordsize < sizeof(sa.sa_handler__)) { 329 struct old_sigaction32 { 330 uint32_t sa_handler__; 331 uint32_t sa_mask; 332 uint32_t sa_flags; 333 uint32_t sa_restorer; 334 } sa32; 335 336 if (umove_or_printaddr(tcp, addr, &sa32)) 337 return; 338 339 memset(&sa, 0, sizeof(sa)); 340 sa.sa_handler__ = sa32.sa_handler__; 341 sa.sa_flags = sa32.sa_flags; 342 sa.sa_restorer = sa32.sa_restorer; 343 sa.sa_mask = sa32.sa_mask; 344 } else 345 #endif 346 if (umove_or_printaddr(tcp, addr, &sa)) 347 return; 348 349 tprints("{sa_handler="); 350 print_sa_handler(sa.sa_handler__); 351 tprints(", sa_mask="); 352 tprint_old_sigmask_val("", sa.sa_mask); 353 tprints(", sa_flags="); 354 printflags(sigact_flags, sa.sa_flags, "SA_???"); 355 #if !(defined ALPHA || defined MIPS) 356 if (sa.sa_flags & 0x04000000U) { 357 tprints(", sa_restorer="); 358 printaddr(sa.sa_restorer); 359 } 360 #endif 361 tprints("}"); 362 } 363 364 SYS_FUNC(sigaction) 365 { 366 if (entering(tcp)) { 367 int signo = tcp->u_arg[0]; 368 #if defined SPARC || defined SPARC64 369 if (signo < 0) { 370 tprints("-"); 371 signo = -signo; 372 } 373 #endif 374 printsignal(signo); 375 tprints(", "); 376 decode_old_sigaction(tcp, tcp->u_arg[1]); 377 tprints(", "); 378 } else 379 decode_old_sigaction(tcp, tcp->u_arg[2]); 380 return 0; 381 } 382 383 SYS_FUNC(signal) 384 { 385 if (entering(tcp)) { 386 printsignal(tcp->u_arg[0]); 387 tprints(", "); 388 print_sa_handler(tcp->u_arg[1]); 389 return 0; 390 } else if (!syserror(tcp)) { 391 tcp->auxstr = get_sa_handler_str(tcp->u_rval); 392 return RVAL_HEX | RVAL_STR; 393 } 394 return 0; 395 } 396 397 SYS_FUNC(sgetmask) 398 { 399 if (exiting(tcp) && !syserror(tcp)) { 400 tcp->auxstr = sprint_old_sigmask_val("mask ", tcp->u_rval); 401 return RVAL_HEX | RVAL_STR; 402 } 403 return 0; 404 } 405 406 SYS_FUNC(sigsuspend) 407 { 408 #ifdef MIPS 409 print_sigset_addr_len(tcp, tcp->u_arg[tcp->s_ent->nargs - 1], 410 current_wordsize); 411 #else 412 tprint_old_sigmask_val("", tcp->u_arg[tcp->s_ent->nargs - 1]); 413 #endif 414 415 return RVAL_DECODED; 416 } 417 418 #ifdef ALPHA 419 /* 420 * The OSF/1 sigprocmask is different: it doesn't pass in two pointers, 421 * but rather passes in the new bitmask as an argument and then returns 422 * the old bitmask. This "works" because we only have 64 signals to worry 423 * about. If you want more, use of the rt_sigprocmask syscall is required. 424 * 425 * Alpha: 426 * old = osf_sigprocmask(how, new); 427 * Everyone else: 428 * ret = sigprocmask(how, &new, &old, ...); 429 */ 430 SYS_FUNC(osf_sigprocmask) 431 { 432 if (entering(tcp)) { 433 printxval(sigprocmaskcmds, tcp->u_arg[0], "SIG_???"); 434 tprintsigmask_val(", ", tcp->u_arg[1]); 435 } else if (!syserror(tcp)) { 436 tcp->auxstr = sprintsigmask_val("old mask ", tcp->u_rval); 437 return RVAL_HEX | RVAL_STR; 438 } 439 return 0; 440 } 441 442 #else /* !ALPHA */ 443 444 /* "Old" sigprocmask, which operates with word-sized signal masks */ 445 SYS_FUNC(sigprocmask) 446 { 447 if (entering(tcp)) { 448 printxval(sigprocmaskcmds, tcp->u_arg[0], "SIG_???"); 449 tprints(", "); 450 print_sigset_addr_len(tcp, tcp->u_arg[1], current_wordsize); 451 tprints(", "); 452 } else { 453 print_sigset_addr_len(tcp, tcp->u_arg[2], current_wordsize); 454 } 455 return 0; 456 } 457 #endif /* !ALPHA */ 458 459 SYS_FUNC(kill) 460 { 461 tprintf("%d, %s", 462 (int) tcp->u_arg[0], 463 signame(tcp->u_arg[1])); 464 465 return RVAL_DECODED; 466 } 467 468 SYS_FUNC(tgkill) 469 { 470 tprintf("%d, %d, %s", 471 (int) tcp->u_arg[0], 472 (int) tcp->u_arg[1], 473 signame(tcp->u_arg[2])); 474 475 return RVAL_DECODED; 476 } 477 478 SYS_FUNC(sigpending) 479 { 480 if (exiting(tcp)) 481 print_sigset_addr_len(tcp, tcp->u_arg[0], current_wordsize); 482 return 0; 483 } 484 485 SYS_FUNC(rt_sigprocmask) 486 { 487 /* Note: arg[3] is the length of the sigset. Kernel requires NSIG_BYTES */ 488 if (entering(tcp)) { 489 printxval(sigprocmaskcmds, tcp->u_arg[0], "SIG_???"); 490 tprints(", "); 491 print_sigset_addr_len(tcp, tcp->u_arg[1], tcp->u_arg[3]); 492 tprints(", "); 493 } else { 494 print_sigset_addr_len(tcp, tcp->u_arg[2], tcp->u_arg[3]); 495 tprintf(", %" PRI_klu, tcp->u_arg[3]); 496 } 497 return 0; 498 } 499 500 /* Structure describing the action to be taken when a signal arrives. */ 501 struct new_sigaction { 502 /* sa_handler may be a libc #define, need to use other name: */ 503 #ifdef MIPS 504 unsigned int sa_flags; 505 unsigned long sa_handler__; 506 #else 507 unsigned long sa_handler__; 508 unsigned long sa_flags; 509 #endif /* !MIPS */ 510 #if HAVE_SA_RESTORER 511 unsigned long sa_restorer; 512 #endif 513 /* Kernel treats sa_mask as an array of longs. */ 514 unsigned long sa_mask[NSIG / sizeof(long)]; 515 }; 516 /* Same for i386-on-x86_64 and similar cases */ 517 struct new_sigaction32 { 518 uint32_t sa_handler__; 519 uint32_t sa_flags; 520 #if HAVE_SA_RESTORER 521 uint32_t sa_restorer; 522 #endif 523 uint32_t sa_mask[2 * (NSIG / sizeof(long))]; 524 }; 525 526 static void 527 decode_new_sigaction(struct tcb *const tcp, const kernel_ulong_t addr) 528 { 529 struct new_sigaction sa; 530 531 #ifndef current_wordsize 532 if (current_wordsize < sizeof(sa.sa_handler__)) { 533 struct new_sigaction32 sa32; 534 535 if (umove_or_printaddr(tcp, addr, &sa32)) 536 return; 537 538 memset(&sa, 0, sizeof(sa)); 539 sa.sa_handler__ = sa32.sa_handler__; 540 sa.sa_flags = sa32.sa_flags; 541 #if HAVE_SA_RESTORER && defined SA_RESTORER 542 sa.sa_restorer = sa32.sa_restorer; 543 #endif 544 /* Kernel treats sa_mask as an array of longs. 545 * For 32-bit process, "long" is uint32_t, thus, for example, 546 * 32th bit in sa_mask will end up as bit 0 in sa_mask[1]. 547 * But for (64-bit) kernel, 32th bit in sa_mask is 548 * 32th bit in 0th (64-bit) long! 549 * For little-endian, it's the same. 550 * For big-endian, we swap 32-bit words. 551 */ 552 sa.sa_mask[0] = ULONG_LONG(sa32.sa_mask[0], sa32.sa_mask[1]); 553 } else 554 #endif 555 if (umove_or_printaddr(tcp, addr, &sa)) 556 return; 557 558 tprints("{sa_handler="); 559 print_sa_handler(sa.sa_handler__); 560 tprints(", sa_mask="); 561 /* 562 * Sigset size is in tcp->u_arg[4] (SPARC) 563 * or in tcp->u_arg[3] (all other), 564 * but kernel won't handle sys_rt_sigaction 565 * with wrong sigset size (just returns EINVAL instead). 566 * We just fetch the right size, which is NSIG_BYTES. 567 */ 568 tprintsigmask_val("", sa.sa_mask); 569 tprints(", sa_flags="); 570 571 printflags(sigact_flags, sa.sa_flags, "SA_???"); 572 #if HAVE_SA_RESTORER && defined SA_RESTORER 573 if (sa.sa_flags & SA_RESTORER) { 574 tprints(", sa_restorer="); 575 printaddr(sa.sa_restorer); 576 } 577 #endif 578 tprints("}"); 579 } 580 581 SYS_FUNC(rt_sigaction) 582 { 583 if (entering(tcp)) { 584 printsignal(tcp->u_arg[0]); 585 tprints(", "); 586 decode_new_sigaction(tcp, tcp->u_arg[1]); 587 tprints(", "); 588 } else { 589 decode_new_sigaction(tcp, tcp->u_arg[2]); 590 #if defined(SPARC) || defined(SPARC64) 591 tprintf(", %#" PRI_klx ", %" PRI_klu, tcp->u_arg[3], tcp->u_arg[4]); 592 #elif defined(ALPHA) 593 tprintf(", %" PRI_klu ", %#" PRI_klx, tcp->u_arg[3], tcp->u_arg[4]); 594 #else 595 tprintf(", %" PRI_klu, tcp->u_arg[3]); 596 #endif 597 } 598 return 0; 599 } 600 601 SYS_FUNC(rt_sigpending) 602 { 603 if (exiting(tcp)) { 604 /* 605 * One of the few syscalls where sigset size (arg[1]) 606 * is allowed to be <= NSIG_BYTES, not strictly ==. 607 * This allows non-rt sigpending() syscall 608 * to reuse rt_sigpending() code in kernel. 609 */ 610 print_sigset_addr_len_limit(tcp, tcp->u_arg[0], 611 tcp->u_arg[1], 1); 612 tprintf(", %" PRI_klu, tcp->u_arg[1]); 613 } 614 return 0; 615 } 616 617 SYS_FUNC(rt_sigsuspend) 618 { 619 /* NB: kernel requires arg[1] == NSIG_BYTES */ 620 print_sigset_addr_len(tcp, tcp->u_arg[0], tcp->u_arg[1]); 621 tprintf(", %" PRI_klu, tcp->u_arg[1]); 622 623 return RVAL_DECODED; 624 } 625 626 static void 627 print_sigqueueinfo(struct tcb *const tcp, const int sig, 628 const kernel_ulong_t addr) 629 { 630 printsignal(sig); 631 tprints(", "); 632 printsiginfo_at(tcp, addr); 633 } 634 635 SYS_FUNC(rt_sigqueueinfo) 636 { 637 tprintf("%d, ", (int) tcp->u_arg[0]); 638 print_sigqueueinfo(tcp, tcp->u_arg[1], tcp->u_arg[2]); 639 640 return RVAL_DECODED; 641 } 642 643 SYS_FUNC(rt_tgsigqueueinfo) 644 { 645 tprintf("%d, %d, ", (int) tcp->u_arg[0], (int) tcp->u_arg[1]); 646 print_sigqueueinfo(tcp, tcp->u_arg[2], tcp->u_arg[3]); 647 648 return RVAL_DECODED; 649 } 650 651 SYS_FUNC(rt_sigtimedwait) 652 { 653 /* NB: kernel requires arg[3] == NSIG_BYTES */ 654 if (entering(tcp)) { 655 print_sigset_addr_len(tcp, tcp->u_arg[0], tcp->u_arg[3]); 656 tprints(", "); 657 if (!(tcp->u_arg[1] && verbose(tcp))) { 658 /* 659 * This is the only "return" parameter, 660 * if we are not going to fetch it on exit, 661 * decode all parameters on entry. 662 */ 663 printaddr(tcp->u_arg[1]); 664 tprints(", "); 665 print_timespec(tcp, tcp->u_arg[2]); 666 tprintf(", %" PRI_klu, tcp->u_arg[3]); 667 } else { 668 char *sts = xstrdup(sprint_timespec(tcp, tcp->u_arg[2])); 669 set_tcb_priv_data(tcp, sts, free); 670 } 671 } else { 672 if (tcp->u_arg[1] && verbose(tcp)) { 673 printsiginfo_at(tcp, tcp->u_arg[1]); 674 tprints(", "); 675 tprints(get_tcb_priv_data(tcp)); 676 tprintf(", %" PRI_klu, tcp->u_arg[3]); 677 } 678 679 if (!syserror(tcp) && tcp->u_rval) { 680 tcp->auxstr = signame(tcp->u_rval); 681 return RVAL_STR; 682 } 683 } 684 return 0; 685 }; 686 687 SYS_FUNC(restart_syscall) 688 { 689 tprintf("<... resuming interrupted %s ...>", 690 tcp->s_prev_ent ? tcp->s_prev_ent->sys_name : "system call"); 691 692 return RVAL_DECODED; 693 } 694
