desc.c revision 414fe7d4d284e22d7855c5367f17dbc0714738d9 
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 SUPPORTED_PERSONALITIES > 1
240	if (personality_wordsize[current_personality] != sizeof(fl.l_start)) {
241		if (personality_wordsize[current_personality] == 4) {
242			/* 32-bit x86 app on x86_64 and similar cases */
243			struct {
244				short int l_type;
245				short int l_whence;
246				int32_t l_start; /* off_t */
247				int32_t l_len; /* off_t */
248				int32_t l_pid; /* pid_t */
249			} fl32;
250			if (umove(tcp, addr, &fl32) < 0) {
251				tprintf("{...}");
252				return;
253			}
254			fl.l_type = fl32.l_type;
255			fl.l_whence = fl32.l_whence;
256			fl.l_start = fl32.l_start;
257			fl.l_len = fl32.l_len;
258			fl.l_pid = fl32.l_pid;
259		} else {
260			/* let people know we have a problem here */
261			tprintf("{ <decode error: unsupported wordsize %d> }",
262				personality_wordsize[current_personality]);
263			return;
264		}
265	} else
266#endif
267	{
268		if (umove(tcp, addr, &fl) < 0) {
269			tprintf("{...}");
270			return;
271		}
272	}
273	tprintf("{type=");
274	printxval(lockfcmds, fl.l_type, "F_???");
275	tprintf(", whence=");
276	printxval(whence, fl.l_whence, "SEEK_???");
277	tprintf(", start=%ld, len=%ld", fl.l_start, fl.l_len);
278	if (getlk)
279		tprintf(", pid=%lu}", (unsigned long) fl.l_pid);
280	else
281		tprintf("}");
282}
283#endif
284
285#if _LFS64_LARGEFILE || HAVE_LONG_LONG_OFF_T
286/* fcntl/lockf */
287static void
288printflock64(struct tcb *tcp, long addr, int getlk)
289{
290	struct flock64 fl;
291
292	if (umove(tcp, addr, &fl) < 0) {
293		tprintf("{...}");
294		return;
295	}
296	tprintf("{type=");
297	printxval(lockfcmds, fl.l_type, "F_???");
298	tprintf(", whence=");
299	printxval(whence, fl.l_whence, "SEEK_???");
300	tprintf(", start=%lld, len=%lld", (long long) fl.l_start, (long long) fl.l_len);
301	if (getlk)
302		tprintf(", pid=%lu}", (unsigned long) fl.l_pid);
303	else
304		tprintf("}");
305}
306#endif
307
308int
309sys_fcntl(struct tcb *tcp)
310{
311	if (entering(tcp)) {
312		tprintf("%ld, ", tcp->u_arg[0]);
313		printxval(fcntlcmds, tcp->u_arg[1], "F_???");
314		switch (tcp->u_arg[1]) {
315		case F_SETFD:
316			tprintf(", ");
317			printflags(fdflags, tcp->u_arg[2], "FD_???");
318			break;
319		case F_SETOWN: case F_DUPFD:
320#ifdef F_DUPFD_CLOEXEC
321		case F_DUPFD_CLOEXEC:
322#endif
323			tprintf(", %ld", tcp->u_arg[2]);
324			break;
325		case F_SETFL:
326			tprintf(", ");
327			tprint_open_modes(tcp->u_arg[2]);
328			break;
329		case F_SETLK: case F_SETLKW:
330#ifdef F_FREESP
331		case F_FREESP:
332#endif
333			tprintf(", ");
334			printflock(tcp, tcp->u_arg[2], 0);
335			break;
336#if _LFS64_LARGEFILE
337#ifdef F_FREESP64
338		case F_FREESP64:
339#endif
340		/* Linux glibc defines SETLK64 as SETLK,
341		   even though the kernel has different values - as does Solaris. */
342#if defined(F_SETLK64) && F_SETLK64 + 0 != F_SETLK
343		case F_SETLK64:
344#endif
345#if defined(F_SETLKW64) && F_SETLKW64 + 0 != F_SETLKW
346		case F_SETLKW64:
347#endif
348			tprintf(", ");
349			printflock64(tcp, tcp->u_arg[2], 0);
350			break;
351#endif
352#ifdef F_NOTIFY
353		case F_NOTIFY:
354			tprintf(", ");
355			printflags(notifyflags, tcp->u_arg[2], "DN_???");
356			break;
357#endif
358#ifdef F_SETLEASE
359		case F_SETLEASE:
360			tprintf(", ");
361			printxval(lockfcmds, tcp->u_arg[2], "F_???");
362			break;
363#endif
364		}
365	}
366	else {
367		switch (tcp->u_arg[1]) {
368		case F_DUPFD:
369#ifdef F_DUPFD_CLOEXEC
370		case F_DUPFD_CLOEXEC:
371#endif
372		case F_SETFD: case F_SETFL:
373		case F_SETLK: case F_SETLKW:
374		case F_SETOWN: case F_GETOWN:
375#ifdef F_NOTIFY
376		case F_NOTIFY:
377#endif
378#ifdef F_SETLEASE
379		case F_SETLEASE:
380#endif
381			break;
382		case F_GETFD:
383			if (syserror(tcp) || tcp->u_rval == 0)
384				return 0;
385			tcp->auxstr = sprintflags("flags ", fdflags, tcp->u_rval);
386			return RVAL_HEX|RVAL_STR;
387		case F_GETFL:
388			if (syserror(tcp))
389				return 0;
390			tcp->auxstr = sprint_open_modes(tcp->u_rval);
391			return RVAL_HEX|RVAL_STR;
392		case F_GETLK:
393			tprintf(", ");
394			printflock(tcp, tcp->u_arg[2], 1);
395			break;
396#if _LFS64_LARGEFILE
397#if defined(F_GETLK64) && F_GETLK64+0!=F_GETLK
398		case F_GETLK64:
399#endif
400			tprintf(", ");
401			printflock64(tcp, tcp->u_arg[2], 1);
402			break;
403#endif
404#ifdef F_GETLEASE
405		case F_GETLEASE:
406			if (syserror(tcp))
407				return 0;
408			tcp->auxstr = xlookup(lockfcmds, tcp->u_rval);
409			return RVAL_HEX|RVAL_STR;
410#endif
411		default:
412			tprintf(", %#lx", tcp->u_arg[2]);
413			break;
414		}
415	}
416	return 0;
417}
418
419#ifdef LOCK_SH
420
421int
422sys_flock(struct tcb *tcp)
423{
424	if (entering(tcp)) {
425		tprintf("%ld, ", tcp->u_arg[0]);
426		printflags(flockcmds, tcp->u_arg[1], "LOCK_???");
427	}
428	return 0;
429}
430#endif /* LOCK_SH */
431
432int
433sys_close(struct tcb *tcp)
434{
435	if (entering(tcp)) {
436		tprintf("%ld", tcp->u_arg[0]);
437	}
438	return 0;
439}
440
441int
442sys_dup(struct tcb *tcp)
443{
444	if (entering(tcp)) {
445		tprintf("%ld", tcp->u_arg[0]);
446	}
447	return 0;
448}
449
450static int
451do_dup2(struct tcb *tcp, int flags_arg)
452{
453	if (entering(tcp)) {
454		tprintf("%ld, %ld", tcp->u_arg[0], tcp->u_arg[1]);
455		if (flags_arg >= 0) {
456			tprintf(", ");
457			printflags(open_mode_flags, tcp->u_arg[flags_arg], "O_???");
458		}
459	}
460	return 0;
461}
462
463int
464sys_dup2(struct tcb *tcp)
465{
466	return do_dup2(tcp, -1);
467}
468
469#ifdef LINUX
470int
471sys_dup3(struct tcb *tcp)
472{
473	return do_dup2(tcp, 2);
474}
475#endif
476
477#if defined(ALPHA) || defined(FREEBSD) || defined(SUNOS4)
478int
479sys_getdtablesize(struct tcb *tcp)
480{
481	return 0;
482}
483#endif /* ALPHA || FREEBSD || SUNOS4 */
484
485static int
486decode_select(struct tcb *tcp, long *args, enum bitness_t bitness)
487{
488	int i, j, nfds;
489	unsigned int fdsize = ((((args[0] + 7) / 8) + sizeof(long) - 1)
490			       & -sizeof(long));
491	fd_set *fds;
492	static char outstr[1024];
493	char *sep;
494	long arg;
495
496	if (entering(tcp)) {
497		fds = (fd_set *) malloc(fdsize);
498		if (fds == NULL)
499			fprintf(stderr, "out of memory\n");
500		nfds = args[0];
501		tprintf("%d", nfds);
502		for (i = 0; i < 3; i++) {
503			arg = args[i+1];
504			if (arg == 0) {
505				tprintf(", NULL");
506				continue;
507			}
508			if (fds == NULL || !verbose(tcp)) {
509				tprintf(", %#lx", arg);
510				continue;
511			}
512			if (umoven(tcp, arg, fdsize, (char *) fds) < 0) {
513				tprintf(", [?]");
514				continue;
515			}
516			tprintf(", [");
517			for (j = 0, sep = ""; j < nfds; j++) {
518				if (FD_ISSET(j, fds)) {
519					tprintf("%s%u", sep, j);
520					sep = " ";
521				}
522			}
523			tprintf("]");
524		}
525		free(fds);
526		tprintf(", ");
527		printtv_bitness(tcp, args[4], bitness, 0);
528	}
529	else
530	{
531		unsigned int cumlen = 0;
532		char *sep = "";
533
534		if (syserror(tcp))
535			return 0;
536
537		if ((nfds = tcp->u_rval) == 0) {
538			tcp->auxstr = "Timeout";
539			return RVAL_STR;
540		}
541
542		fds = (fd_set *) malloc(fdsize);
543		if (fds == NULL)
544			fprintf(stderr, "out of memory\n");
545
546		outstr[0] = '\0';
547		for (i = 0; i < 3; i++) {
548			int first = 1;
549			char str[20];
550
551			tcp->auxstr = outstr;
552			arg = args[i+1];
553			if (fds == NULL || !arg ||
554			    umoven(tcp, arg, fdsize, (char *) fds) < 0)
555				continue;
556			for (j = 0; j < args[0]; j++) {
557				if (FD_ISSET(j, fds)) {
558					if (first) {
559						sprintf(str, "%s%s [%u", sep,
560							i == 0 ? "in" :
561							i == 1 ? "out" :
562							"except", j);
563						first = 0;
564						sep = ", ";
565					}
566					else
567						sprintf(str, " %u", j);
568					cumlen += strlen(str);
569					if (cumlen < sizeof(outstr))
570						strcat(outstr, str);
571					nfds--;
572				}
573			}
574			if (cumlen)
575				strcat(outstr, "]");
576			if (nfds == 0)
577				break;
578		}
579		free(fds);
580#ifdef LINUX
581		/* This contains no useful information on SunOS.  */
582		if (args[4]) {
583			char str[128];
584
585			sprintf(str, "%sleft ", sep);
586			sprinttv(tcp, args[4], bitness, str + strlen(str));
587			if ((cumlen += strlen(str)) < sizeof(outstr))
588				strcat(outstr, str);
589		}
590#endif /* LINUX */
591		return RVAL_STR;
592	}
593	return 0;
594}
595
596#ifdef LINUX
597
598int
599sys_oldselect(struct tcb *tcp)
600{
601	long args[5];
602
603	if (umoven(tcp, tcp->u_arg[0], sizeof args, (char *) args) < 0) {
604		tprintf("[...]");
605		return 0;
606	}
607	return decode_select(tcp, args, BITNESS_CURRENT);
608}
609
610#ifdef ALPHA
611int
612sys_osf_select(struct tcb *tcp)
613{
614	long *args = tcp->u_arg;
615	return decode_select(tcp, args, BITNESS_32);
616}
617#endif
618
619static const struct xlat epollctls[] = {
620#ifdef EPOLL_CTL_ADD
621	{ EPOLL_CTL_ADD,	"EPOLL_CTL_ADD"	},
622#endif
623#ifdef EPOLL_CTL_MOD
624	{ EPOLL_CTL_MOD,	"EPOLL_CTL_MOD"	},
625#endif
626#ifdef EPOLL_CTL_DEL
627	{ EPOLL_CTL_DEL,	"EPOLL_CTL_DEL"	},
628#endif
629	{ 0,			NULL		}
630};
631
632static const struct xlat epollevents[] = {
633#ifdef EPOLLIN
634	{ EPOLLIN,	"EPOLLIN"	},
635#endif
636#ifdef EPOLLPRI
637	{ EPOLLPRI,	"EPOLLPRI"	},
638#endif
639#ifdef EPOLLOUT
640	{ EPOLLOUT,	"EPOLLOUT"	},
641#endif
642#ifdef EPOLLRDNORM
643	{ EPOLLRDNORM,	"EPOLLRDNORM"	},
644#endif
645#ifdef EPOLLRDBAND
646	{ EPOLLRDBAND,	"EPOLLRDBAND"	},
647#endif
648#ifdef EPOLLWRNORM
649	{ EPOLLWRNORM,	"EPOLLWRNORM"	},
650#endif
651#ifdef EPOLLWRBAND
652	{ EPOLLWRBAND,	"EPOLLWRBAND"	},
653#endif
654#ifdef EPOLLMSG
655	{ EPOLLMSG,	"EPOLLMSG"	},
656#endif
657#ifdef EPOLLERR
658	{ EPOLLERR,	"EPOLLERR"	},
659#endif
660#ifdef EPOLLHUP
661	{ EPOLLHUP,	"EPOLLHUP"	},
662#endif
663#ifdef EPOLLONESHOT
664	{ EPOLLONESHOT,	"EPOLLONESHOT"	},
665#endif
666#ifdef EPOLLET
667	{ EPOLLET,	"EPOLLET"	},
668#endif
669	{ 0,		NULL		}
670};
671
672int
673sys_epoll_create(struct tcb *tcp)
674{
675	if (entering(tcp))
676		tprintf("%ld", tcp->u_arg[0]);
677	return 0;
678}
679
680int
681sys_epoll_create1(struct tcb *tcp)
682{
683	if (entering(tcp))
684		printflags(open_mode_flags, tcp->u_arg[0], "O_???");
685	return 0;
686}
687
688#ifdef HAVE_SYS_EPOLL_H
689static void
690print_epoll_event(struct epoll_event *ev)
691{
692	tprintf("{");
693	printflags(epollevents, ev->events, "EPOLL???");
694	/* We cannot know what format the program uses, so print u32 and u64
695	   which will cover every value.  */
696	tprintf(", {u32=%" PRIu32 ", u64=%" PRIu64 "}}",
697		ev->data.u32, ev->data.u64);
698}
699#endif
700
701int
702sys_epoll_ctl(struct tcb *tcp)
703{
704	if (entering(tcp)) {
705		tprintf("%ld, ", tcp->u_arg[0]);
706		printxval(epollctls, tcp->u_arg[1], "EPOLL_CTL_???");
707		tprintf(", %ld, ", tcp->u_arg[2]);
708		if (tcp->u_arg[3] == 0)
709			tprintf("NULL");
710		else {
711#ifdef HAVE_SYS_EPOLL_H
712			struct epoll_event ev;
713			if (umove(tcp, tcp->u_arg[3], &ev) == 0)
714				print_epoll_event(&ev);
715			else
716#endif
717				tprintf("{...}");
718		}
719	}
720	return 0;
721}
722
723static void
724epoll_wait_common(struct tcb *tcp)
725{
726	if (entering(tcp))
727		tprintf("%ld, ", tcp->u_arg[0]);
728	else {
729		if (syserror(tcp))
730			tprintf("%lx", tcp->u_arg[1]);
731		else if (tcp->u_rval == 0)
732			tprintf("{}");
733		else {
734#ifdef HAVE_SYS_EPOLL_H
735			struct epoll_event ev, *start, *cur, *end;
736			int failed = 0;
737
738			tprintf("{");
739			start = (struct epoll_event *) tcp->u_arg[1];
740			end = start + tcp->u_rval;
741			for (cur = start; cur < end; ++cur) {
742				if (cur > start)
743					tprintf(", ");
744				if (umove(tcp, (long) cur, &ev) == 0)
745					print_epoll_event(&ev);
746				else {
747					tprintf("?");
748					failed = 1;
749					break;
750				}
751			}
752			tprintf("}");
753			if (failed)
754				tprintf(" %#lx", (long) start);
755#else
756			tprintf("{...}");
757#endif
758		}
759		tprintf(", %ld, %ld", tcp->u_arg[2], tcp->u_arg[3]);
760	}
761}
762
763int
764sys_epoll_wait(struct tcb *tcp)
765{
766	epoll_wait_common(tcp);
767	return 0;
768}
769
770int
771sys_epoll_pwait(struct tcb *tcp)
772{
773	epoll_wait_common(tcp);
774	if (exiting(tcp))
775		print_sigset(tcp, tcp->u_arg[4], 0);
776	return 0;
777}
778
779int
780sys_io_setup(struct tcb *tcp)
781{
782	if (entering(tcp))
783		tprintf("%ld, ", tcp->u_arg[0]);
784	else {
785		if (syserror(tcp))
786			tprintf("0x%0lx", tcp->u_arg[1]);
787		else {
788			unsigned long user_id;
789			if (umove(tcp, tcp->u_arg[1], &user_id) == 0)
790				tprintf("{%lu}", user_id);
791			else
792				tprintf("{...}");
793		}
794	}
795	return 0;
796}
797
798int
799sys_io_destroy(struct tcb *tcp)
800{
801	if (entering(tcp))
802		tprintf("%lu", tcp->u_arg[0]);
803	return 0;
804}
805
806int
807sys_io_submit(struct tcb *tcp)
808{
809	long nr;
810	if (entering(tcp)) {
811		tprintf("%lu, %ld, ", tcp->u_arg[0], tcp->u_arg[1]);
812		nr = tcp->u_arg[1];
813		/* and if nr is negative? */
814		if (nr == 0)
815			tprintf("{}");
816		else {
817#ifdef HAVE_LIBAIO_H
818			long i;
819			struct iocb *iocbp, **iocbs = (void *)tcp->u_arg[2];
820
821			for (i = 0; i < nr; i++, iocbs++) {
822				struct iocb iocb;
823				if (i == 0)
824					tprintf("{");
825				else
826					tprintf(", ");
827
828				if (umove(tcp, (unsigned long)iocbs, &iocbp) ||
829				    umove(tcp, (unsigned long)iocbp, &iocb)) {
830					tprintf("{...}");
831					continue;
832				}
833				tprintf("{%p, %u, %hu, %hu, %d}",
834					iocb.data, iocb.key,
835					iocb.aio_lio_opcode,
836					iocb.aio_reqprio, iocb.aio_fildes);
837			}
838			if (i)
839				tprintf("}");
840#else
841			tprintf("{...}");
842#endif
843		}
844	}
845	return 0;
846}
847
848int
849sys_io_cancel(struct tcb *tcp)
850{
851	if (entering(tcp)) {
852#ifdef HAVE_LIBAIO_H
853		struct iocb iocb;
854#endif
855		tprintf("%lu, ", tcp->u_arg[0]);
856#ifdef HAVE_LIBAIO_H
857		if (umove(tcp, tcp->u_arg[1], &iocb) == 0) {
858			tprintf("{%p, %u, %hu, %hu, %d}, ",
859				iocb.data, iocb.key,
860				iocb.aio_lio_opcode,
861				iocb.aio_reqprio, iocb.aio_fildes);
862		} else
863#endif
864			tprintf("{...}, ");
865	} else {
866		if (tcp->u_rval < 0)
867			tprintf("{...}");
868		else {
869#ifdef HAVE_LIBAIO_H
870			struct io_event event;
871			if (umove(tcp, tcp->u_arg[2], &event) == 0)
872				tprintf("{%p, %p, %ld, %ld}",
873					event.data, event.obj,
874					event.res, event.res2);
875			else
876#endif
877				tprintf("{...}");
878		}
879	}
880	return 0;
881}
882
883int
884sys_io_getevents(struct tcb *tcp)
885{
886	if (entering(tcp)) {
887		tprintf("%ld, %ld, %ld, ", tcp->u_arg[0], tcp->u_arg[1],
888			tcp->u_arg[2]);
889	} else {
890		if (tcp->u_rval == 0) {
891			tprintf("{}");
892		} else  {
893#ifdef HAVE_LIBAIO_H
894			struct io_event *events = (void *)tcp->u_arg[3];
895			long i, nr = tcp->u_rval;
896
897			for (i = 0; i < nr; i++, events++) {
898				struct io_event event;
899
900				if (i == 0)
901					tprintf("{");
902				else
903					tprintf(", ");
904
905				if (umove(tcp, (unsigned long)events, &event) != 0) {
906					tprintf("{...}");
907					continue;
908				}
909				tprintf("{%p, %p, %ld, %ld}", event.data,
910					event.obj, event.res, event.res2);
911			}
912			tprintf("}, ");
913#else
914				tprintf("{...}");
915#endif
916		}
917
918		print_timespec(tcp, tcp->u_arg[4]);
919	}
920	return 0;
921}
922#endif /* LINUX */
923
924int
925sys_select(struct tcb *tcp)
926{
927	return decode_select(tcp, tcp->u_arg, BITNESS_CURRENT);
928}
929
930#ifdef LINUX
931int
932sys_pselect6(struct tcb *tcp)
933{
934	int rc = decode_select(tcp, tcp->u_arg, BITNESS_CURRENT);
935	if (entering(tcp)) {
936		struct {
937			void *ss;
938			unsigned long len;
939		} data;
940		if (umove(tcp, tcp->u_arg[5], &data) < 0)
941			tprintf(", %#lx", tcp->u_arg[5]);
942		else {
943			tprintf(", {");
944			if (data.len < sizeof(long))
945				tprintf("%#lx", (long)data.ss);
946			else
947				print_sigset(tcp, (long)data.ss, 0);
948			tprintf(", %lu}", data.len);
949		}
950	}
951	return rc;
952}
953
954static int
955do_eventfd(struct tcb *tcp, int flags_arg)
956{
957	if (entering(tcp)) {
958		tprintf("%lu", tcp->u_arg[0]);
959		if (flags_arg >= 0) {
960			tprintf(", ");
961			printflags(open_mode_flags, tcp->u_arg[flags_arg], "O_???");
962		}
963	}
964	return 0;
965}
966
967int
968sys_eventfd(struct tcb *tcp)
969{
970	return do_eventfd(tcp, -1);
971}
972
973int
974sys_eventfd2(struct tcb *tcp)
975{
976	return do_eventfd(tcp, 1);
977}
978#endif
979