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