desc.c revision eedaac768dcb55346292495440f1201bd7b2b1b4 
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 *	$Id$
31 */
32
33#include "defs.h"
34
35#include <fcntl.h>
36#include <sys/file.h>
37#ifdef LINUX
38#include <inttypes.h>
39#endif
40#ifdef HAVE_SYS_EPOLL_H
41#include <sys/epoll.h>
42#endif
43#ifdef HAVE_LIBAIO_H
44#include <libaio.h>
45#endif
46
47#if HAVE_LONG_LONG_OFF_T
48/*
49 * Hacks for systems that have a long long off_t
50 */
51#define flock64	flock		/* Horrid hack */
52#define printflock printflock64	/* Horrider hack */
53#endif
54
55
56static const struct xlat fcntlcmds[] = {
57	{ F_DUPFD,	"F_DUPFD"	},
58	{ F_GETFD,	"F_GETFD"	},
59	{ F_SETFD,	"F_SETFD"	},
60	{ F_GETFL,	"F_GETFL"	},
61	{ F_SETFL,	"F_SETFL"	},
62	{ F_GETLK,	"F_GETLK"	},
63	{ F_SETLK,	"F_SETLK"	},
64	{ F_SETLKW,	"F_SETLKW"	},
65	{ F_GETOWN,	"F_GETOWN"	},
66	{ F_SETOWN,	"F_SETOWN"	},
67#ifdef F_RSETLK
68	{ F_RSETLK,	"F_RSETLK"	},
69#endif
70#ifdef F_RSETLKW
71	{ F_RSETLKW,	"F_RSETLKW"	},
72#endif
73#ifdef F_RGETLK
74	{ F_RGETLK,	"F_RGETLK"	},
75#endif
76#ifdef F_CNVT
77	{ F_CNVT,	"F_CNVT"	},
78#endif
79#ifdef F_SETSIG
80	{ F_SETSIG,	"F_SETSIG"	},
81#endif
82#ifdef F_GETSIG
83	{ F_GETSIG,	"F_GETSIG"	},
84#endif
85#ifdef F_CHKFL
86	{ F_CHKFL,	"F_CHKFL"	},
87#endif
88#ifdef F_DUP2FD
89	{ F_DUP2FD,	"F_DUP2FD"	},
90#endif
91#ifdef F_ALLOCSP
92	{ F_ALLOCSP,	"F_ALLOCSP"	},
93#endif
94#ifdef F_ISSTREAM
95	{ F_ISSTREAM,	"F_ISSTREAM"	},
96#endif
97#ifdef F_PRIV
98	{ F_PRIV,	"F_PRIV"	},
99#endif
100#ifdef F_NPRIV
101	{ F_NPRIV,	"F_NPRIV"	},
102#endif
103#ifdef F_QUOTACL
104	{ F_QUOTACL,	"F_QUOTACL"	},
105#endif
106#ifdef F_BLOCKS
107	{ F_BLOCKS,	"F_BLOCKS"	},
108#endif
109#ifdef F_BLKSIZE
110	{ F_BLKSIZE,	"F_BLKSIZE"	},
111#endif
112#ifdef F_GETOWN
113	{ F_GETOWN,	"F_GETOWN"	},
114#endif
115#ifdef F_SETOWN
116	{ F_SETOWN,	"F_SETOWN"	},
117#endif
118#ifdef F_REVOKE
119	{ F_REVOKE,	"F_REVOKE"	},
120#endif
121#ifdef F_SETLK
122	{ F_SETLK,	"F_SETLK"	},
123#endif
124#ifdef F_SETLKW
125	{ F_SETLKW,	"F_SETLKW"	},
126#endif
127#ifdef F_FREESP
128	{ F_FREESP,	"F_FREESP"	},
129#endif
130#ifdef F_GETLK
131	{ F_GETLK,	"F_GETLK"	},
132#endif
133#ifdef F_SETLK64
134	{ F_SETLK64,	"F_SETLK64"	},
135#endif
136#ifdef F_SETLKW64
137	{ F_SETLKW64,	"F_SETLKW64"	},
138#endif
139#ifdef F_FREESP64
140	{ F_FREESP64,	"F_FREESP64"	},
141#endif
142#ifdef F_GETLK64
143	{ F_GETLK64,	"F_GETLK64"	},
144#endif
145#ifdef F_SHARE
146	{ F_SHARE,	"F_SHARE"	},
147#endif
148#ifdef F_UNSHARE
149	{ F_UNSHARE,	"F_UNSHARE"	},
150#endif
151#ifdef F_SETLEASE
152	{ F_SETLEASE,	"F_SETLEASE"	},
153#endif
154#ifdef F_GETLEASE
155	{ F_GETLEASE,	"F_GETLEASE"	},
156#endif
157#ifdef F_NOTIFY
158	{ F_NOTIFY,	"F_NOTIFY"	},
159#endif
160#ifdef F_DUPFD_CLOEXEC
161	{ F_DUPFD_CLOEXEC,"F_DUPFD_CLOEXEC"},
162#endif
163	{ 0,		NULL		},
164};
165
166static const struct xlat fdflags[] = {
167#ifdef FD_CLOEXEC
168	{ FD_CLOEXEC,	"FD_CLOEXEC"	},
169#endif
170	{ 0,		NULL		},
171};
172
173#ifdef LOCK_SH
174
175static const struct xlat flockcmds[] = {
176	{ LOCK_SH,	"LOCK_SH"	},
177	{ LOCK_EX,	"LOCK_EX"	},
178	{ LOCK_NB,	"LOCK_NB"	},
179	{ LOCK_UN,	"LOCK_UN"	},
180	{ 0,		NULL		},
181};
182
183#endif /* LOCK_SH */
184
185static const struct xlat lockfcmds[] = {
186	{ F_RDLCK,	"F_RDLCK"	},
187	{ F_WRLCK,	"F_WRLCK"	},
188	{ F_UNLCK,	"F_UNLCK"	},
189#ifdef F_EXLCK
190	{ F_EXLCK,	"F_EXLCK"	},
191#endif
192#ifdef F_SHLCK
193	{ F_SHLCK,	"F_SHLCK"	},
194#endif
195	{ 0,		NULL		},
196};
197
198#ifdef F_NOTIFY
199static const struct xlat notifyflags[] = {
200#ifdef DN_ACCESS
201	{ DN_ACCESS,	"DN_ACCESS"	},
202#endif
203#ifdef DN_MODIFY
204	{ DN_MODIFY,	"DN_MODIFY"	},
205#endif
206#ifdef DN_CREATE
207	{ DN_CREATE,	"DN_CREATE"	},
208#endif
209#ifdef DN_DELETE
210	{ DN_DELETE,	"DN_DELETE"	},
211#endif
212#ifdef DN_RENAME
213	{ DN_RENAME,	"DN_RENAME"	},
214#endif
215#ifdef DN_ATTRIB
216	{ DN_ATTRIB,	"DN_ATTRIB"	},
217#endif
218#ifdef DN_MULTISHOT
219	{ DN_MULTISHOT,	"DN_MULTISHOT"	},
220#endif
221	{ 0,		NULL		},
222};
223#endif
224
225static const struct xlat whence[] = {
226	{ SEEK_SET,	"SEEK_SET"	},
227	{ SEEK_CUR,	"SEEK_CUR"	},
228	{ SEEK_END,	"SEEK_END"	},
229	{ 0,		NULL		},
230};
231
232#ifndef HAVE_LONG_LONG_OFF_T
233/* fcntl/lockf */
234static void
235printflock(struct tcb *tcp, long addr, int getlk)
236{
237	struct flock fl;
238
239	if (personality_wordsize[current_personality] == sizeof(fl.l_start)) {
240		if (umove(tcp, addr, &fl) < 0) {
241			tprintf("{...}");
242			return;
243		}
244	} else if (personality_wordsize[current_personality] == 4) {
245		/* 32-bit x86 app on x86_64 and similar cases */
246		struct {
247			short int l_type;
248			short int l_whence;
249			int32_t l_start; /* off_t */
250			int32_t l_len; /* off_t */
251			int32_t l_pid; /* pid_t */
252		} fl32;
253		if (umove(tcp, addr, &fl32) < 0) {
254			tprintf("{...}");
255			return;
256		}
257		fl.l_type = fl32.l_type;
258		fl.l_whence = fl32.l_whence;
259		fl.l_start = fl32.l_start;
260		fl.l_len = fl32.l_len;
261		fl.l_pid = fl32.l_pid;
262	} else {
263		/* let people know we have a problem here */
264		tprintf("{ <decode error: unsupported wordsize %d> }",
265				personality_wordsize[current_personality]);
266		return;
267	}
268	tprintf("{type=");
269	printxval(lockfcmds, fl.l_type, "F_???");
270	tprintf(", whence=");
271	printxval(whence, fl.l_whence, "SEEK_???");
272	tprintf(", start=%ld, len=%ld", fl.l_start, fl.l_len);
273	if (getlk)
274		tprintf(", pid=%lu}", (unsigned long) fl.l_pid);
275	else
276		tprintf("}");
277}
278#endif
279
280#if _LFS64_LARGEFILE || HAVE_LONG_LONG_OFF_T
281/* fcntl/lockf */
282static void
283printflock64(struct tcb *tcp, long addr, int getlk)
284{
285	struct flock64 fl;
286
287	if (umove(tcp, addr, &fl) < 0) {
288		tprintf("{...}");
289		return;
290	}
291	tprintf("{type=");
292	printxval(lockfcmds, fl.l_type, "F_???");
293	tprintf(", whence=");
294	printxval(whence, fl.l_whence, "SEEK_???");
295	tprintf(", start=%lld, len=%lld", (long long) fl.l_start, (long long) fl.l_len);
296	if (getlk)
297		tprintf(", pid=%lu}", (unsigned long) fl.l_pid);
298	else
299		tprintf("}");
300}
301#endif
302
303int
304sys_fcntl(struct tcb *tcp)
305{
306	if (entering(tcp)) {
307		tprintf("%ld, ", tcp->u_arg[0]);
308		printxval(fcntlcmds, tcp->u_arg[1], "F_???");
309		switch (tcp->u_arg[1]) {
310		case F_SETFD:
311			tprintf(", ");
312			printflags(fdflags, tcp->u_arg[2], "FD_???");
313			break;
314		case F_SETOWN: case F_DUPFD:
315#ifdef F_DUPFD_CLOEXEC
316		case F_DUPFD_CLOEXEC:
317#endif
318			tprintf(", %ld", tcp->u_arg[2]);
319			break;
320		case F_SETFL:
321			tprintf(", ");
322			tprint_open_modes(tcp->u_arg[2]);
323			break;
324		case F_SETLK: case F_SETLKW:
325#ifdef F_FREESP
326		case F_FREESP:
327#endif
328			tprintf(", ");
329			printflock(tcp, tcp->u_arg[2], 0);
330			break;
331#if _LFS64_LARGEFILE
332#ifdef F_FREESP64
333		case F_FREESP64:
334#endif
335		/* Linux glibc defines SETLK64 as SETLK,
336		   even though the kernel has different values - as does Solaris. */
337#if defined(F_SETLK64) && F_SETLK64 + 0 != F_SETLK
338		case F_SETLK64:
339#endif
340#if defined(F_SETLKW64) && F_SETLKW64 + 0 != F_SETLKW
341		case F_SETLKW64:
342#endif
343			tprintf(", ");
344			printflock64(tcp, tcp->u_arg[2], 0);
345			break;
346#endif
347#ifdef F_NOTIFY
348		case F_NOTIFY:
349			tprintf(", ");
350			printflags(notifyflags, tcp->u_arg[2], "DN_???");
351			break;
352#endif
353#ifdef F_SETLEASE
354		case F_SETLEASE:
355			tprintf(", ");
356			printxval(lockfcmds, tcp->u_arg[2], "F_???");
357			break;
358#endif
359		}
360	}
361	else {
362		switch (tcp->u_arg[1]) {
363		case F_DUPFD:
364#ifdef F_DUPFD_CLOEXEC
365		case F_DUPFD_CLOEXEC:
366#endif
367		case F_SETFD: case F_SETFL:
368		case F_SETLK: case F_SETLKW:
369		case F_SETOWN: case F_GETOWN:
370#ifdef F_NOTIFY
371		case F_NOTIFY:
372#endif
373#ifdef F_SETLEASE
374		case F_SETLEASE:
375#endif
376			break;
377		case F_GETFD:
378			if (syserror(tcp) || tcp->u_rval == 0)
379				return 0;
380			tcp->auxstr = sprintflags("flags ", fdflags, tcp->u_rval);
381			return RVAL_HEX|RVAL_STR;
382		case F_GETFL:
383			if (syserror(tcp))
384				return 0;
385			tcp->auxstr = sprint_open_modes(tcp->u_rval);
386			return RVAL_HEX|RVAL_STR;
387		case F_GETLK:
388			tprintf(", ");
389			printflock(tcp, tcp->u_arg[2], 1);
390			break;
391#if _LFS64_LARGEFILE
392#if defined(F_GETLK64) && F_GETLK64+0!=F_GETLK
393		case F_GETLK64:
394#endif
395			tprintf(", ");
396			printflock64(tcp, tcp->u_arg[2], 1);
397			break;
398#endif
399#ifdef F_GETLEASE
400		case F_GETLEASE:
401			if (syserror(tcp))
402				return 0;
403			tcp->auxstr = xlookup(lockfcmds, tcp->u_rval);
404			return RVAL_HEX|RVAL_STR;
405#endif
406		default:
407			tprintf(", %#lx", tcp->u_arg[2]);
408			break;
409		}
410	}
411	return 0;
412}
413
414#ifdef LOCK_SH
415
416int
417sys_flock(struct tcb *tcp)
418{
419	if (entering(tcp)) {
420		tprintf("%ld, ", tcp->u_arg[0]);
421		printflags(flockcmds, tcp->u_arg[1], "LOCK_???");
422	}
423	return 0;
424}
425#endif /* LOCK_SH */
426
427int
428sys_close(struct tcb *tcp)
429{
430	if (entering(tcp)) {
431		tprintf("%ld", tcp->u_arg[0]);
432	}
433	return 0;
434}
435
436int
437sys_dup(struct tcb *tcp)
438{
439	if (entering(tcp)) {
440		tprintf("%ld", tcp->u_arg[0]);
441	}
442	return 0;
443}
444
445static int
446do_dup2(struct tcb *tcp, int flags_arg)
447{
448	if (entering(tcp)) {
449		tprintf("%ld, %ld", tcp->u_arg[0], tcp->u_arg[1]);
450		if (flags_arg >= 0) {
451			tprintf(", ");
452			printflags(open_mode_flags, tcp->u_arg[flags_arg], "O_???");
453		}
454	}
455	return 0;
456}
457
458int
459sys_dup2(struct tcb *tcp)
460{
461	return do_dup2(tcp, -1);
462}
463
464#ifdef LINUX
465int
466sys_dup3(struct tcb *tcp)
467{
468	return do_dup2(tcp, 2);
469}
470#endif
471
472#if defined(ALPHA) || defined(FREEBSD) || defined(SUNOS4)
473int
474sys_getdtablesize(struct tcb *tcp)
475{
476	return 0;
477}
478#endif /* ALPHA || FREEBSD || SUNOS4 */
479
480static int
481decode_select(struct tcb *tcp, long *args, enum bitness_t bitness)
482{
483	int i, j, nfds;
484	unsigned int fdsize = ((((args[0] + 7) / 8) + sizeof(long) - 1)
485			       & -sizeof(long));
486	fd_set *fds;
487	static char outstr[1024];
488	char *sep;
489	long arg;
490
491	if (entering(tcp)) {
492		fds = (fd_set *) malloc(fdsize);
493		if (fds == NULL)
494			fprintf(stderr, "out of memory\n");
495		nfds = args[0];
496		tprintf("%d", nfds);
497		for (i = 0; i < 3; i++) {
498			arg = args[i+1];
499			if (arg == 0) {
500				tprintf(", NULL");
501				continue;
502			}
503			if (fds == NULL || !verbose(tcp)) {
504				tprintf(", %#lx", arg);
505				continue;
506			}
507			if (umoven(tcp, arg, fdsize, (char *) fds) < 0) {
508				tprintf(", [?]");
509				continue;
510			}
511			tprintf(", [");
512			for (j = 0, sep = ""; j < nfds; j++) {
513				if (FD_ISSET(j, fds)) {
514					tprintf("%s%u", sep, j);
515					sep = " ";
516				}
517			}
518			tprintf("]");
519		}
520		free(fds);
521		tprintf(", ");
522		printtv_bitness(tcp, args[4], bitness, 0);
523	}
524	else
525	{
526		unsigned int cumlen = 0;
527		char *sep = "";
528
529		if (syserror(tcp))
530			return 0;
531
532		if ((nfds = tcp->u_rval) == 0) {
533			tcp->auxstr = "Timeout";
534			return RVAL_STR;
535		}
536
537		fds = (fd_set *) malloc(fdsize);
538		if (fds == NULL)
539			fprintf(stderr, "out of memory\n");
540
541		outstr[0] = '\0';
542		for (i = 0; i < 3; i++) {
543			int first = 1;
544			char str[20];
545
546			tcp->auxstr = outstr;
547			arg = args[i+1];
548			if (fds == NULL || !arg ||
549			    umoven(tcp, arg, fdsize, (char *) fds) < 0)
550				continue;
551			for (j = 0; j < args[0]; j++) {
552				if (FD_ISSET(j, fds)) {
553					if (first) {
554						sprintf(str, "%s%s [%u", sep,
555							i == 0 ? "in" :
556							i == 1 ? "out" :
557							"except", j);
558						first = 0;
559						sep = ", ";
560					}
561					else
562						sprintf(str, " %u", j);
563					cumlen += strlen(str);
564					if (cumlen < sizeof(outstr))
565						strcat(outstr, str);
566					nfds--;
567				}
568			}
569			if (cumlen)
570				strcat(outstr, "]");
571			if (nfds == 0)
572				break;
573		}
574		free(fds);
575#ifdef LINUX
576		/* This contains no useful information on SunOS.  */
577		if (args[4]) {
578			char str[128];
579
580			sprintf(str, "%sleft ", sep);
581			sprinttv(tcp, args[4], bitness, str + strlen(str));
582			if ((cumlen += strlen(str)) < sizeof(outstr))
583				strcat(outstr, str);
584		}
585#endif /* LINUX */
586		return RVAL_STR;
587	}
588	return 0;
589}
590
591#ifdef LINUX
592
593int
594sys_oldselect(struct tcb *tcp)
595{
596	long args[5];
597
598	if (umoven(tcp, tcp->u_arg[0], sizeof args, (char *) args) < 0) {
599		tprintf("[...]");
600		return 0;
601	}
602	return decode_select(tcp, args, BITNESS_CURRENT);
603}
604
605#ifdef ALPHA
606int
607sys_osf_select(struct tcb *tcp)
608{
609	long *args = tcp->u_arg;
610	return decode_select(tcp, args, BITNESS_32);
611}
612#endif
613
614static const struct xlat epollctls[] = {
615#ifdef EPOLL_CTL_ADD
616	{ EPOLL_CTL_ADD,	"EPOLL_CTL_ADD"	},
617#endif
618#ifdef EPOLL_CTL_MOD
619	{ EPOLL_CTL_MOD,	"EPOLL_CTL_MOD"	},
620#endif
621#ifdef EPOLL_CTL_DEL
622	{ EPOLL_CTL_DEL,	"EPOLL_CTL_DEL"	},
623#endif
624	{ 0,			NULL		}
625};
626
627static const struct xlat epollevents[] = {
628#ifdef EPOLLIN
629	{ EPOLLIN,	"EPOLLIN"	},
630#endif
631#ifdef EPOLLPRI
632	{ EPOLLPRI,	"EPOLLPRI"	},
633#endif
634#ifdef EPOLLOUT
635	{ EPOLLOUT,	"EPOLLOUT"	},
636#endif
637#ifdef EPOLLRDNORM
638	{ EPOLLRDNORM,	"EPOLLRDNORM"	},
639#endif
640#ifdef EPOLLRDBAND
641	{ EPOLLRDBAND,	"EPOLLRDBAND"	},
642#endif
643#ifdef EPOLLWRNORM
644	{ EPOLLWRNORM,	"EPOLLWRNORM"	},
645#endif
646#ifdef EPOLLWRBAND
647	{ EPOLLWRBAND,	"EPOLLWRBAND"	},
648#endif
649#ifdef EPOLLMSG
650	{ EPOLLMSG,	"EPOLLMSG"	},
651#endif
652#ifdef EPOLLERR
653	{ EPOLLERR,	"EPOLLERR"	},
654#endif
655#ifdef EPOLLHUP
656	{ EPOLLHUP,	"EPOLLHUP"	},
657#endif
658#ifdef EPOLLONESHOT
659	{ EPOLLONESHOT,	"EPOLLONESHOT"	},
660#endif
661#ifdef EPOLLET
662	{ EPOLLET,	"EPOLLET"	},
663#endif
664	{ 0,		NULL		}
665};
666
667int
668sys_epoll_create(struct tcb *tcp)
669{
670	if (entering(tcp))
671		tprintf("%ld", tcp->u_arg[0]);
672	return 0;
673}
674
675int
676sys_epoll_create1(struct tcb *tcp)
677{
678	if (entering(tcp))
679		printflags(open_mode_flags, tcp->u_arg[0], "O_???");
680	return 0;
681}
682
683#ifdef HAVE_SYS_EPOLL_H
684static void
685print_epoll_event(struct epoll_event *ev)
686{
687	tprintf("{");
688	printflags(epollevents, ev->events, "EPOLL???");
689	/* We cannot know what format the program uses, so print u32 and u64
690	   which will cover every value.  */
691	tprintf(", {u32=%" PRIu32 ", u64=%" PRIu64 "}}",
692		ev->data.u32, ev->data.u64);
693}
694#endif
695
696int
697sys_epoll_ctl(struct tcb *tcp)
698{
699	if (entering(tcp)) {
700		tprintf("%ld, ", tcp->u_arg[0]);
701		printxval(epollctls, tcp->u_arg[1], "EPOLL_CTL_???");
702		tprintf(", %ld, ", tcp->u_arg[2]);
703		if (tcp->u_arg[3] == 0)
704			tprintf("NULL");
705		else {
706#ifdef HAVE_SYS_EPOLL_H
707			struct epoll_event ev;
708			if (umove(tcp, tcp->u_arg[3], &ev) == 0)
709				print_epoll_event(&ev);
710			else
711#endif
712				tprintf("{...}");
713		}
714	}
715	return 0;
716}
717
718static void
719epoll_wait_common(struct tcb *tcp)
720{
721	if (entering(tcp))
722		tprintf("%ld, ", tcp->u_arg[0]);
723	else {
724		if (syserror(tcp))
725			tprintf("%lx", tcp->u_arg[1]);
726		else if (tcp->u_rval == 0)
727			tprintf("{}");
728		else {
729#ifdef HAVE_SYS_EPOLL_H
730			struct epoll_event ev, *start, *cur, *end;
731			int failed = 0;
732
733			tprintf("{");
734			start = (struct epoll_event *) tcp->u_arg[1];
735			end = start + tcp->u_rval;
736			for (cur = start; cur < end; ++cur) {
737				if (cur > start)
738					tprintf(", ");
739				if (umove(tcp, (long) cur, &ev) == 0)
740					print_epoll_event(&ev);
741				else {
742					tprintf("?");
743					failed = 1;
744					break;
745				}
746			}
747			tprintf("}");
748			if (failed)
749				tprintf(" %#lx", (long) start);
750#else
751			tprintf("{...}");
752#endif
753		}
754		tprintf(", %ld, %ld", tcp->u_arg[2], tcp->u_arg[3]);
755	}
756}
757
758int
759sys_epoll_wait(struct tcb *tcp)
760{
761	epoll_wait_common(tcp);
762	return 0;
763}
764
765int
766sys_epoll_pwait(struct tcb *tcp)
767{
768	epoll_wait_common(tcp);
769	if (exiting(tcp))
770		print_sigset(tcp, tcp->u_arg[4], 0);
771	return 0;
772}
773
774int
775sys_io_setup(struct tcb *tcp)
776{
777	if (entering(tcp))
778		tprintf("%ld, ", tcp->u_arg[0]);
779	else {
780		if (syserror(tcp))
781			tprintf("0x%0lx", tcp->u_arg[1]);
782		else {
783			unsigned long user_id;
784			if (umove(tcp, tcp->u_arg[1], &user_id) == 0)
785				tprintf("{%lu}", user_id);
786			else
787				tprintf("{...}");
788		}
789	}
790	return 0;
791}
792
793int
794sys_io_destroy(struct tcb *tcp)
795{
796	if (entering(tcp))
797		tprintf("%lu", tcp->u_arg[0]);
798	return 0;
799}
800
801int
802sys_io_submit(struct tcb *tcp)
803{
804	long nr;
805	if (entering(tcp)) {
806		tprintf("%lu, %ld, ", tcp->u_arg[0], tcp->u_arg[1]);
807		nr = tcp->u_arg[1];
808		/* and if nr is negative? */
809		if (nr == 0)
810			tprintf("{}");
811		else {
812#ifdef HAVE_LIBAIO_H
813			long i;
814			struct iocb *iocbp, **iocbs = (void *)tcp->u_arg[2];
815
816			for (i = 0; i < nr; i++, iocbs++) {
817				struct iocb iocb;
818				if (i == 0)
819					tprintf("{");
820				else
821					tprintf(", ");
822
823				if (umove(tcp, (unsigned long)iocbs, &iocbp) ||
824				    umove(tcp, (unsigned long)iocbp, &iocb)) {
825					tprintf("{...}");
826					continue;
827				}
828				tprintf("{%p, %u, %hu, %hu, %d}",
829					iocb.data, iocb.key,
830					iocb.aio_lio_opcode,
831					iocb.aio_reqprio, iocb.aio_fildes);
832			}
833			if (i)
834				tprintf("}");
835#else
836			tprintf("{...}");
837#endif
838		}
839	}
840	return 0;
841}
842
843int
844sys_io_cancel(struct tcb *tcp)
845{
846	if (entering(tcp)) {
847#ifdef HAVE_LIBAIO_H
848		struct iocb iocb;
849#endif
850		tprintf("%lu, ", tcp->u_arg[0]);
851#ifdef HAVE_LIBAIO_H
852		if (umove(tcp, tcp->u_arg[1], &iocb) == 0) {
853			tprintf("{%p, %u, %hu, %hu, %d}, ",
854				iocb.data, iocb.key,
855				iocb.aio_lio_opcode,
856				iocb.aio_reqprio, iocb.aio_fildes);
857		} else
858#endif
859			tprintf("{...}, ");
860	} else {
861		if (tcp->u_rval < 0)
862			tprintf("{...}");
863		else {
864#ifdef HAVE_LIBAIO_H
865			struct io_event event;
866			if (umove(tcp, tcp->u_arg[2], &event) == 0)
867				tprintf("{%p, %p, %ld, %ld}",
868					event.data, event.obj,
869					event.res, event.res2);
870			else
871#endif
872				tprintf("{...}");
873		}
874	}
875	return 0;
876}
877
878int
879sys_io_getevents(struct tcb *tcp)
880{
881	if (entering(tcp)) {
882		tprintf("%ld, %ld, %ld, ", tcp->u_arg[0], tcp->u_arg[1],
883			tcp->u_arg[2]);
884	} else {
885		if (tcp->u_rval == 0) {
886			tprintf("{}");
887		} else  {
888#ifdef HAVE_LIBAIO_H
889			struct io_event *events = (void *)tcp->u_arg[3];
890			long i, nr = tcp->u_rval;
891
892			for (i = 0; i < nr; i++, events++) {
893				struct io_event event;
894
895				if (i == 0)
896					tprintf("{");
897				else
898					tprintf(", ");
899
900				if (umove(tcp, (unsigned long)events, &event) != 0) {
901					tprintf("{...}");
902					continue;
903				}
904				tprintf("{%p, %p, %ld, %ld}", event.data,
905					event.obj, event.res, event.res2);
906			}
907			tprintf("}, ");
908#else
909				tprintf("{...}");
910#endif
911		}
912
913		print_timespec(tcp, tcp->u_arg[4]);
914	}
915	return 0;
916}
917#endif /* LINUX */
918
919int
920sys_select(struct tcb *tcp)
921{
922	return decode_select(tcp, tcp->u_arg, BITNESS_CURRENT);
923}
924
925#ifdef LINUX
926int
927sys_pselect6(struct tcb *tcp)
928{
929	int rc = decode_select(tcp, tcp->u_arg, BITNESS_CURRENT);
930	if (entering(tcp)) {
931		struct {
932			void *ss;
933			unsigned long len;
934		} data;
935		if (umove(tcp, tcp->u_arg[5], &data) < 0)
936			tprintf(", %#lx", tcp->u_arg[5]);
937		else {
938			tprintf(", {");
939			if (data.len < sizeof(long))
940				tprintf("%#lx", (long)data.ss);
941			else
942				print_sigset(tcp, (long)data.ss, 0);
943			tprintf(", %lu}", data.len);
944		}
945	}
946	return rc;
947}
948
949static int
950do_eventfd(struct tcb *tcp, int flags_arg)
951{
952	if (entering(tcp)) {
953		tprintf("%lu", tcp->u_arg[0]);
954		if (flags_arg >= 0) {
955			tprintf(", ");
956			printflags(open_mode_flags, tcp->u_arg[flags_arg], "O_???");
957		}
958	}
959	return 0;
960}
961
962int
963sys_eventfd(struct tcb *tcp)
964{
965	return do_eventfd(tcp, -1);
966}
967
968int
969sys_eventfd2(struct tcb *tcp)
970{
971	return do_eventfd(tcp, 1);
972}
973#endif
974