desc.c revision 6522f132ba865f90ba3bb3a740eff191911e4dba 
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 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 *    notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 *    notice, this list of conditions and the following disclaimer in the
15 *    documentation and/or other materials provided with the distribution.
16 * 3. The name of the author may not be used to endorse or promote products
17 *    derived from this software without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
20 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
21 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
22 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
23 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
24 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
28 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29 */
30
31#include "defs.h"
32#include <fcntl.h>
33#include <sys/file.h>
34#ifdef HAVE_SYS_EPOLL_H
35# include <sys/epoll.h>
36#endif
37#ifdef HAVE_LINUX_PERF_EVENT_H
38# include  <linux/perf_event.h>
39#endif
40
41#include "xlat/fcntlcmds.h"
42#include "xlat/fdflags.h"
43#include "xlat/flockcmds.h"
44#include "xlat/lockfcmds.h"
45#include "xlat/notifyflags.h"
46#include "xlat/perf_event_open_flags.h"
47
48/*
49 * Assume that F_SETLK64, F_SETLKW64, and F_GETLK64 are either defined
50 * or not defined altogether.
51 */
52#if defined(F_SETLK64) && F_SETLK64 + 0 != F_SETLK
53# define USE_PRINTFLOCK64 1
54#else
55# define USE_PRINTFLOCK64 0
56#endif
57
58#if USE_PRINTFLOCK64
59
60# ifndef HAVE_STRUCT_FLOCK64
61struct flock64 {
62	short int l_type, l_whence;
63	int64_t l_start, l_len;
64	int l_pid;
65};
66# endif
67
68static void
69printflock64(struct tcb *tcp, long addr, int getlk)
70{
71	struct flock64 fl;
72
73	if (umove(tcp, addr, &fl) < 0) {
74		tprints("{...}");
75		return;
76	}
77	tprints("{type=");
78	printxval(lockfcmds, fl.l_type, "F_???");
79	tprints(", whence=");
80	printxval(whence_codes, fl.l_whence, "SEEK_???");
81	tprintf(", start=%lld, len=%lld", (long long) fl.l_start, (long long) fl.l_len);
82	if (getlk)
83		tprintf(", pid=%lu}", (unsigned long) fl.l_pid);
84	else
85		tprints("}");
86}
87#endif /* USE_PRINTFLOCK64 */
88
89static void
90printflock(struct tcb *tcp, long addr, int getlk)
91{
92	struct flock fl;
93	int r;
94
95#if SUPPORTED_PERSONALITIES > 1
96	if (
97# if SIZEOF_OFF_T > SIZEOF_LONG
98	    current_personality > 0 &&
99#endif
100	    current_wordsize != sizeof(fl.l_start)) {
101		if (current_wordsize == 4) {
102			/* 32-bit x86 app on x86_64 and similar cases */
103			struct {
104				short int l_type;
105				short int l_whence;
106				int32_t l_start; /* off_t */
107				int32_t l_len; /* off_t */
108				int32_t l_pid; /* pid_t */
109			} fl32;
110			r = umove(tcp, addr, &fl32);
111			if (r >= 0) {
112				fl.l_type = fl32.l_type;
113				fl.l_whence = fl32.l_whence;
114				fl.l_start = fl32.l_start;
115				fl.l_len = fl32.l_len;
116				fl.l_pid = fl32.l_pid;
117			}
118		} else {
119			/* let people know we have a problem here */
120			tprintf("<decode error: unsupported wordsize %d>",
121				current_wordsize);
122			return;
123		}
124	} else
125#endif
126	{
127		r = umove(tcp, addr, &fl);
128	}
129	if (r < 0) {
130		tprints("{...}");
131		return;
132	}
133	tprints("{type=");
134	printxval(lockfcmds, fl.l_type, "F_???");
135	tprints(", whence=");
136	printxval(whence_codes, fl.l_whence, "SEEK_???");
137#if SIZEOF_OFF_T > SIZEOF_LONG
138	tprintf(", start=%lld, len=%lld", fl.l_start, fl.l_len);
139#else
140	tprintf(", start=%ld, len=%ld", fl.l_start, fl.l_len);
141#endif
142	if (getlk)
143		tprintf(", pid=%lu}", (unsigned long) fl.l_pid);
144	else
145		tprints("}");
146}
147
148int
149sys_fcntl(struct tcb *tcp)
150{
151	if (entering(tcp)) {
152		printfd(tcp, tcp->u_arg[0]);
153		tprints(", ");
154		printxval(fcntlcmds, tcp->u_arg[1], "F_???");
155		switch (tcp->u_arg[1]) {
156		case F_SETFD:
157			tprints(", ");
158			printflags(fdflags, tcp->u_arg[2], "FD_???");
159			break;
160		case F_SETOWN: case F_DUPFD:
161#ifdef F_DUPFD_CLOEXEC
162		case F_DUPFD_CLOEXEC:
163#endif
164			tprintf(", %ld", tcp->u_arg[2]);
165			break;
166		case F_SETFL:
167			tprints(", ");
168			tprint_open_modes(tcp->u_arg[2]);
169			break;
170		case F_SETLK: case F_SETLKW:
171			tprints(", ");
172			printflock(tcp, tcp->u_arg[2], 0);
173			break;
174#if USE_PRINTFLOCK64
175		case F_SETLK64: case F_SETLKW64:
176			tprints(", ");
177			printflock64(tcp, tcp->u_arg[2], 0);
178			break;
179#endif /* USE_PRINTFLOCK64 */
180#ifdef F_NOTIFY
181		case F_NOTIFY:
182			tprints(", ");
183			printflags(notifyflags, tcp->u_arg[2], "DN_???");
184			break;
185#endif
186#ifdef F_SETLEASE
187		case F_SETLEASE:
188			tprints(", ");
189			printxval(lockfcmds, tcp->u_arg[2], "F_???");
190			break;
191#endif
192		}
193	}
194	else {
195		switch (tcp->u_arg[1]) {
196		case F_DUPFD:
197#ifdef F_DUPFD_CLOEXEC
198		case F_DUPFD_CLOEXEC:
199#endif
200		case F_SETFD: case F_SETFL:
201		case F_SETLK: case F_SETLKW:
202		case F_SETOWN: case F_GETOWN:
203#ifdef F_NOTIFY
204		case F_NOTIFY:
205#endif
206#ifdef F_SETLEASE
207		case F_SETLEASE:
208#endif
209			break;
210		case F_GETFD:
211			if (syserror(tcp) || tcp->u_rval == 0)
212				return 0;
213			tcp->auxstr = sprintflags("flags ", fdflags, tcp->u_rval);
214			return RVAL_HEX|RVAL_STR;
215		case F_GETFL:
216			if (syserror(tcp))
217				return 0;
218			tcp->auxstr = sprint_open_modes(tcp->u_rval);
219			return RVAL_HEX|RVAL_STR;
220		case F_GETLK:
221			tprints(", ");
222			printflock(tcp, tcp->u_arg[2], 1);
223			break;
224#if USE_PRINTFLOCK64
225		case F_GETLK64:
226			tprints(", ");
227			printflock64(tcp, tcp->u_arg[2], 1);
228			break;
229#endif
230#ifdef F_GETLEASE
231		case F_GETLEASE:
232			if (syserror(tcp))
233				return 0;
234			tcp->auxstr = xlookup(lockfcmds, tcp->u_rval);
235			return RVAL_HEX|RVAL_STR;
236#endif
237		default:
238			tprintf(", %#lx", tcp->u_arg[2]);
239			break;
240		}
241	}
242	return 0;
243}
244
245#ifdef LOCK_SH
246
247int
248sys_flock(struct tcb *tcp)
249{
250	if (entering(tcp)) {
251		printfd(tcp, tcp->u_arg[0]);
252		tprints(", ");
253		printflags(flockcmds, tcp->u_arg[1], "LOCK_???");
254	}
255	return 0;
256}
257#endif /* LOCK_SH */
258
259int
260sys_close(struct tcb *tcp)
261{
262	if (entering(tcp)) {
263		printfd(tcp, tcp->u_arg[0]);
264	}
265	return 0;
266}
267
268int
269sys_dup(struct tcb *tcp)
270{
271	if (entering(tcp)) {
272		printfd(tcp, tcp->u_arg[0]);
273	}
274	return RVAL_FD;
275}
276
277static int
278do_dup2(struct tcb *tcp, int flags_arg)
279{
280	if (entering(tcp)) {
281		printfd(tcp, tcp->u_arg[0]);
282		tprints(", ");
283		printfd(tcp, tcp->u_arg[1]);
284		if (flags_arg >= 0) {
285			tprints(", ");
286			printflags(open_mode_flags, tcp->u_arg[flags_arg], "O_???");
287		}
288	}
289	return RVAL_FD;
290}
291
292int
293sys_dup2(struct tcb *tcp)
294{
295	return do_dup2(tcp, -1);
296}
297
298int
299sys_dup3(struct tcb *tcp)
300{
301	return do_dup2(tcp, 2);
302}
303
304#if defined(ALPHA)
305int
306sys_getdtablesize(struct tcb *tcp)
307{
308	return 0;
309}
310#endif
311
312static int
313decode_select(struct tcb *tcp, long *args, enum bitness_t bitness)
314{
315	int i, j;
316	int nfds, fdsize;
317	fd_set *fds = NULL;
318	const char *sep;
319	long arg;
320
321	/* Kernel truncates arg[0] to int, we do the same. */
322	nfds = (int) args[0];
323
324	/* Kernel rejects negative nfds, so we don't parse it either. */
325	if (nfds < 0)
326		nfds = 0;
327
328	/* Beware of select(2^31-1, NULL, NULL, NULL) and similar... */
329	if (nfds > 1024*1024)
330		nfds = 1024*1024;
331
332	/*
333	 * We had bugs a-la "while (j < args[0])" and "umoven(args[0])" below.
334	 * Instead of args[0], use nfds for fd count, fdsize for array lengths.
335	 */
336	fdsize = (((nfds + 7) / 8) + current_wordsize-1) & -current_wordsize;
337
338	if (entering(tcp)) {
339		tprintf("%d", (int) args[0]);
340
341		if (fdsize > 0) {
342			fds = malloc(fdsize);
343			if (!fds)
344				die_out_of_memory();
345		}
346		for (i = 0; i < 3; i++) {
347			arg = args[i+1];
348			if (arg == 0) {
349				tprints(", NULL");
350				continue;
351			}
352			if (!verbose(tcp) || !fds) {
353				tprintf(", %#lx", arg);
354				continue;
355			}
356			if (umoven(tcp, arg, fdsize, (char *) fds) < 0) {
357				tprints(", [?]");
358				continue;
359			}
360			tprints(", [");
361			for (j = 0, sep = "";; j++) {
362				j = next_set_bit(fds, j, nfds);
363				if (j < 0)
364					break;
365				tprints(sep);
366				printfd(tcp, j);
367				sep = " ";
368			}
369			tprints("]");
370		}
371		free(fds);
372		tprints(", ");
373		printtv_bitness(tcp, args[4], bitness, 0);
374	}
375	else {
376		static char outstr[1024];
377		char *outptr;
378#define end_outstr (outstr + sizeof(outstr))
379		int ready_fds;
380
381		if (syserror(tcp))
382			return 0;
383
384		ready_fds = tcp->u_rval;
385		if (ready_fds == 0) {
386			tcp->auxstr = "Timeout";
387			return RVAL_STR;
388		}
389
390		fds = malloc(fdsize);
391		if (!fds)
392			die_out_of_memory();
393
394		outptr = outstr;
395		sep = "";
396		for (i = 0; i < 3 && ready_fds > 0; i++) {
397			int first = 1;
398
399			arg = args[i+1];
400			if (!arg || umoven(tcp, arg, fdsize, (char *) fds) < 0)
401				continue;
402			for (j = 0;; j++) {
403				j = next_set_bit(fds, j, nfds);
404				if (j < 0)
405					break;
406				/* +2 chars needed at the end: ']',NUL */
407				if (outptr < end_outstr - (sizeof(", except [") + sizeof(int)*3 + 2)) {
408					if (first) {
409						outptr += sprintf(outptr, "%s%s [%u",
410							sep,
411							i == 0 ? "in" : i == 1 ? "out" : "except",
412							j
413						);
414						first = 0;
415						sep = ", ";
416					}
417					else {
418						outptr += sprintf(outptr, " %u", j);
419					}
420				}
421				if (--ready_fds == 0)
422					break;
423			}
424			if (outptr != outstr)
425				*outptr++ = ']';
426		}
427		free(fds);
428		/* This contains no useful information on SunOS.  */
429		if (args[4]) {
430			if (outptr < end_outstr - (10 + TIMEVAL_TEXT_BUFSIZE)) {
431				outptr += sprintf(outptr, "%sleft ", sep);
432				outptr = sprinttv(outptr, tcp, args[4], bitness, /*special:*/ 0);
433			}
434		}
435		*outptr = '\0';
436		tcp->auxstr = outstr;
437		return RVAL_STR;
438#undef end_outstr
439	}
440	return 0;
441}
442
443int
444sys_oldselect(struct tcb *tcp)
445{
446	long args[5];
447
448	if (umoven(tcp, tcp->u_arg[0], sizeof args, (char *) args) < 0) {
449		tprints("[...]");
450		return 0;
451	}
452	return decode_select(tcp, args, BITNESS_CURRENT);
453}
454
455#ifdef ALPHA
456int
457sys_osf_select(struct tcb *tcp)
458{
459	long *args = tcp->u_arg;
460	return decode_select(tcp, args, BITNESS_32);
461}
462#endif
463
464#include "xlat/epollctls.h"
465#include "xlat/epollevents.h"
466#include "xlat/epollflags.h"
467
468/* Not aliased to printargs_ld: we want it to have a distinct address */
469int
470sys_epoll_create(struct tcb *tcp)
471{
472	return printargs_ld(tcp);
473}
474
475int
476sys_epoll_create1(struct tcb *tcp)
477{
478	if (entering(tcp))
479		printflags(epollflags, tcp->u_arg[0], "EPOLL_???");
480	return 0;
481}
482
483#ifdef HAVE_SYS_EPOLL_H
484static void
485print_epoll_event(struct epoll_event *ev)
486{
487	tprints("{");
488	printflags(epollevents, ev->events, "EPOLL???");
489	/* We cannot know what format the program uses, so print u32 and u64
490	   which will cover every value.  */
491	tprintf(", {u32=%" PRIu32 ", u64=%" PRIu64 "}}",
492		ev->data.u32, ev->data.u64);
493}
494#endif
495
496int
497sys_epoll_ctl(struct tcb *tcp)
498{
499	if (entering(tcp)) {
500		printfd(tcp, tcp->u_arg[0]);
501		tprints(", ");
502		printxval(epollctls, tcp->u_arg[1], "EPOLL_CTL_???");
503		tprints(", ");
504		printfd(tcp, tcp->u_arg[2]);
505		tprints(", ");
506		if (tcp->u_arg[3] == 0)
507			tprints("NULL");
508		else {
509#ifdef HAVE_SYS_EPOLL_H
510			struct epoll_event ev;
511			if (
512#ifdef EPOLL_CTL_DEL
513			    (tcp->u_arg[1] != EPOLL_CTL_DEL) &&
514#endif
515			    umove(tcp, tcp->u_arg[3], &ev) == 0)
516				print_epoll_event(&ev);
517			else
518#endif
519				tprintf("%lx", tcp->u_arg[3]);
520		}
521	}
522	return 0;
523}
524
525static void
526epoll_wait_common(struct tcb *tcp)
527{
528	if (entering(tcp)) {
529		printfd(tcp, tcp->u_arg[0]);
530		tprints(", ");
531	} else {
532		if (syserror(tcp))
533			tprintf("%lx", tcp->u_arg[1]);
534		else if (tcp->u_rval == 0)
535			tprints("{}");
536		else {
537#ifdef HAVE_SYS_EPOLL_H
538			struct epoll_event ev, *start, *cur, *end;
539			int failed = 0;
540
541			tprints("{");
542			start = (struct epoll_event *) tcp->u_arg[1];
543			end = start + tcp->u_rval;
544			for (cur = start; cur < end; ++cur) {
545				if (cur > start)
546					tprints(", ");
547				if (umove(tcp, (long) cur, &ev) == 0)
548					print_epoll_event(&ev);
549				else {
550					tprints("?");
551					failed = 1;
552					break;
553				}
554			}
555			tprints("}");
556			if (failed)
557				tprintf(" %#lx", (long) start);
558#else
559			tprints("{...}");
560#endif
561		}
562		tprintf(", %d, %d", (int) tcp->u_arg[2], (int) tcp->u_arg[3]);
563	}
564}
565
566int
567sys_epoll_wait(struct tcb *tcp)
568{
569	epoll_wait_common(tcp);
570	return 0;
571}
572
573int
574sys_epoll_pwait(struct tcb *tcp)
575{
576	epoll_wait_common(tcp);
577	if (exiting(tcp)) {
578		tprints(", ");
579		/* NB: kernel requires arg[5] == NSIG / 8 */
580		print_sigset_addr_len(tcp, tcp->u_arg[4], tcp->u_arg[5]);
581		tprintf(", %lu", tcp->u_arg[5]);
582	}
583	return 0;
584}
585
586int
587sys_select(struct tcb *tcp)
588{
589	return decode_select(tcp, tcp->u_arg, BITNESS_CURRENT);
590}
591
592int
593sys_pselect6(struct tcb *tcp)
594{
595	int rc = decode_select(tcp, tcp->u_arg, BITNESS_CURRENT);
596	if (entering(tcp)) {
597		long r;
598		struct {
599			unsigned long ptr;
600			unsigned long len;
601		} data;
602#if SUPPORTED_PERSONALITIES > 1 && SIZEOF_LONG > 4
603		if (current_wordsize == 4) {
604			struct {
605				uint32_t ptr;
606				uint32_t len;
607			} data32;
608			r = umove(tcp, tcp->u_arg[5], &data32);
609			data.ptr = data32.ptr;
610			data.len = data32.len;
611		} else
612#endif
613			r = umove(tcp, tcp->u_arg[5], &data);
614		if (r < 0)
615			tprintf(", %#lx", tcp->u_arg[5]);
616		else {
617			tprints(", {");
618			/* NB: kernel requires data.len == NSIG / 8 */
619			print_sigset_addr_len(tcp, data.ptr, data.len);
620			tprintf(", %lu}", data.len);
621		}
622	}
623	return rc;
624}
625
626static int
627do_eventfd(struct tcb *tcp, int flags_arg)
628{
629	if (entering(tcp)) {
630		tprintf("%lu", tcp->u_arg[0]);
631		if (flags_arg >= 0) {
632			tprints(", ");
633			printflags(open_mode_flags, tcp->u_arg[flags_arg], "O_???");
634		}
635	}
636	return 0;
637}
638
639int
640sys_eventfd(struct tcb *tcp)
641{
642	return do_eventfd(tcp, -1);
643}
644
645int
646sys_eventfd2(struct tcb *tcp)
647{
648	return do_eventfd(tcp, 1);
649}
650
651int
652sys_perf_event_open(struct tcb *tcp)
653{
654	if (entering(tcp)) {
655		tprintf("%#lx, %d, %d, %d, ",
656			tcp->u_arg[0],
657			(int) tcp->u_arg[1],
658			(int) tcp->u_arg[2],
659			(int) tcp->u_arg[3]);
660		printflags(perf_event_open_flags, tcp->u_arg[4],
661			   "PERF_FLAG_???");
662	}
663	return 0;
664}
665