desc.c - platform/external/strace - Gitiles

 /*
  * Copyright (c) 1991, 1992 Paul Kranenburg <pk@cs.few.eur.nl>
  * Copyright (c) 1993 Branko Lankester <branko@hacktic.nl>
  * Copyright (c) 1993, 1994, 1995, 1996 Rick Sladkey <jrs@world.std.com>
  * Copyright (c) 1996-1999 Wichert Akkerman <wichert@cistron.nl>
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
  *    documentation and/or other materials provided with the distribution.
  * 3. The name of the author may not be used to endorse or promote products
  *    derived from this software without specific prior written permission.
  *
  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  *
  *	$Id$
  */

 #include "defs.h"

 #include <fcntl.h>
 #include <sys/file.h>
 #ifdef LINUX
 #include <inttypes.h>
 #endif
 #ifdef HAVE_SYS_EPOLL_H
 #include <sys/epoll.h>
 #endif
 #ifdef HAVE_LIBAIO_H
 #include <libaio.h>
 #endif

 #if HAVE_LONG_LONG_OFF_T
 /*
  * Hacks for systems that have a long long off_t
  */
 #define flock64	flock		/* Horrid hack */
 #define printflock printflock64	/* Horrider hack */
 #endif


 static const struct xlat fcntlcmds[] = {
 	{ F_DUPFD,	"F_DUPFD"	},
 	{ F_GETFD,	"F_GETFD"	},
 	{ F_SETFD,	"F_SETFD"	},
 	{ F_GETFL,	"F_GETFL"	},
 	{ F_SETFL,	"F_SETFL"	},
 	{ F_GETLK,	"F_GETLK"	},
 	{ F_SETLK,	"F_SETLK"	},
 	{ F_SETLKW,	"F_SETLKW"	},
 	{ F_GETOWN,	"F_GETOWN"	},
 	{ F_SETOWN,	"F_SETOWN"	},
 #ifdef F_RSETLK
 	{ F_RSETLK,	"F_RSETLK"	},
 #endif
 #ifdef F_RSETLKW
 	{ F_RSETLKW,	"F_RSETLKW"	},
 #endif
 #ifdef F_RGETLK
 	{ F_RGETLK,	"F_RGETLK"	},
 #endif
 #ifdef F_CNVT
 	{ F_CNVT,	"F_CNVT"	},
 #endif
 #ifdef F_SETSIG
 	{ F_SETSIG,	"F_SETSIG"	},
 #endif
 #ifdef F_GETSIG
 	{ F_GETSIG,	"F_GETSIG"	},
 #endif
 #ifdef F_CHKFL
 	{ F_CHKFL,	"F_CHKFL"	},
 #endif
 #ifdef F_DUP2FD
 	{ F_DUP2FD,	"F_DUP2FD"	},
 #endif
 #ifdef F_ALLOCSP
 	{ F_ALLOCSP,	"F_ALLOCSP"	},
 #endif
 #ifdef F_ISSTREAM
 	{ F_ISSTREAM,	"F_ISSTREAM"	},
 #endif
 #ifdef F_PRIV
 	{ F_PRIV,	"F_PRIV"	},
 #endif
 #ifdef F_NPRIV
 	{ F_NPRIV,	"F_NPRIV"	},
 #endif
 #ifdef F_QUOTACL
 	{ F_QUOTACL,	"F_QUOTACL"	},
 #endif
 #ifdef F_BLOCKS
 	{ F_BLOCKS,	"F_BLOCKS"	},
 #endif
 #ifdef F_BLKSIZE
 	{ F_BLKSIZE,	"F_BLKSIZE"	},
 #endif
 #ifdef F_GETOWN
 	{ F_GETOWN,	"F_GETOWN"	},
 #endif
 #ifdef F_SETOWN
 	{ F_SETOWN,	"F_SETOWN"	},
 #endif
 #ifdef F_REVOKE
 	{ F_REVOKE,	"F_REVOKE"	},
 #endif
 #ifdef F_SETLK
 	{ F_SETLK,	"F_SETLK"	},
 #endif
 #ifdef F_SETLKW
 	{ F_SETLKW,	"F_SETLKW"	},
 #endif
 #ifdef F_FREESP
 	{ F_FREESP,	"F_FREESP"	},
 #endif
 #ifdef F_GETLK
 	{ F_GETLK,	"F_GETLK"	},
 #endif
 #ifdef F_SETLK64
 	{ F_SETLK64,	"F_SETLK64"	},
 #endif
 #ifdef F_SETLKW64
 	{ F_SETLKW64,	"F_SETLKW64"	},
 #endif
 #ifdef F_FREESP64
 	{ F_FREESP64,	"F_FREESP64"	},
 #endif
 #ifdef F_GETLK64
 	{ F_GETLK64,	"F_GETLK64"	},
 #endif
 #ifdef F_SHARE
 	{ F_SHARE,	"F_SHARE"	},
 #endif
 #ifdef F_UNSHARE
 	{ F_UNSHARE,	"F_UNSHARE"	},
 #endif
 	{ 0,		NULL		},
 };

 static const struct xlat fdflags[] = {
 #ifdef FD_CLOEXEC
 	{ FD_CLOEXEC,	"FD_CLOEXEC"	},
 #endif
 	{ 0,		NULL		},
 };

 #ifdef LOCK_SH

 static const struct xlat flockcmds[] = {
 	{ LOCK_SH,	"LOCK_SH"	},
 	{ LOCK_EX,	"LOCK_EX"	},
 	{ LOCK_NB,	"LOCK_NB"	},
 	{ LOCK_UN,	"LOCK_UN"	},
 	{ 0,		NULL		},
 };

 #endif /* LOCK_SH */

 static const struct xlat lockfcmds[] = {
 	{ F_RDLCK,	"F_RDLCK"	},
 	{ F_WRLCK,	"F_WRLCK"	},
 	{ F_UNLCK,	"F_UNLCK"	},
 #ifdef F_EXLCK
 	{ F_EXLCK,	"F_EXLCK"	},
 #endif
 #ifdef F_SHLCK
 	{ F_SHLCK,	"F_SHLCK"	},
 #endif
 	{ 0,		NULL		},
 };

 static const struct xlat whence[] = {
 	{ SEEK_SET,	"SEEK_SET"	},
 	{ SEEK_CUR,	"SEEK_CUR"	},
 	{ SEEK_END,	"SEEK_END"	},
 	{ 0,		NULL		},
 };

 #ifndef HAVE_LONG_LONG_OFF_T
 /* fcntl/lockf */
 static void
 printflock(struct tcb *tcp, long addr, int getlk)
 {
 	struct flock fl;

 	if (personality_wordsize[current_personality] == sizeof(fl.l_start)) {
 		if (umove(tcp, addr, &fl) < 0) {
 			tprintf("{...}");
 			return;
 		}
 	} else if (personality_wordsize[current_personality] == 4) {
 		/* 32-bit x86 app on x86_64 and similar cases */
 		struct {
 			short int l_type;
 			short int l_whence;
 			int32_t l_start; /* off_t */
 			int32_t l_len; /* off_t */
 			int32_t l_pid; /* pid_t */
 		} fl32;
 		if (umove(tcp, addr, &fl32) < 0) {
 			tprintf("{...}");
 			return;
 		}
 		fl.l_type = fl32.l_type;
 		fl.l_whence = fl32.l_whence;
 		fl.l_start = fl32.l_start;
 		fl.l_len = fl32.l_len;
 		fl.l_pid = fl32.l_pid;
 	} else {
 		/* let people know we have a problem here */
 		tprintf("{ <decode error: unsupported wordsize %d> }",
 				personality_wordsize[current_personality]);
 		return;
 	}
 	tprintf("{type=");
 	printxval(lockfcmds, fl.l_type, "F_???");
 	tprintf(", whence=");
 	printxval(whence, fl.l_whence, "SEEK_???");
 	tprintf(", start=%ld, len=%ld", fl.l_start, fl.l_len);
 	if (getlk)
 		tprintf(", pid=%lu}", (unsigned long) fl.l_pid);
 	else
 		tprintf("}");
 }
 #endif

 #if _LFS64_LARGEFILE || HAVE_LONG_LONG_OFF_T
 /* fcntl/lockf */
 static void
 printflock64(struct tcb *tcp, long addr, int getlk)
 {
 	struct flock64 fl;

 	if (umove(tcp, addr, &fl) < 0) {
 		tprintf("{...}");
 		return;
 	}
 	tprintf("{type=");
 	printxval(lockfcmds, fl.l_type, "F_???");
 	tprintf(", whence=");
 	printxval(whence, fl.l_whence, "SEEK_???");
 	tprintf(", start=%lld, len=%lld", (long long) fl.l_start, (long long) fl.l_len);
 	if (getlk)
 		tprintf(", pid=%lu}", (unsigned long) fl.l_pid);
 	else
 		tprintf("}");
 }
 #endif

 /*
  * low bits of the open(2) flags define access mode,
  * other bits are real flags.
  */
 static const char *
 sprint_open_modes(mode_t flags)
 {
 	static char outstr[1024];
 	const char *str = xlookup(open_access_modes, flags & 3);
 	const char *sep = "";
 	const struct xlat *x;

 	strcpy(outstr, "flags ");
 	if (str) {
 		strcat(outstr, str);
 		flags &= ~3;
 		if (!flags)
 			return outstr;
 		strcat(outstr, "|");
 	}

 	for (x = open_mode_flags; x->str; x++) {
 		if ((flags & x->val) == x->val) {
 			sprintf(outstr + strlen(outstr),
 				"%s%s", sep, x->str);
 			sep = "|";
 			flags &= ~x->val;
 		}
 	}
 	if (flags)
 		sprintf(outstr + strlen(outstr), "%s%#x", sep, flags);
 	return outstr;
 }

 int
 sys_fcntl(struct tcb *tcp)
 {
 	if (entering(tcp)) {
 		tprintf("%ld, ", tcp->u_arg[0]);
 		printxval(fcntlcmds, tcp->u_arg[1], "F_???");
 		switch (tcp->u_arg[1]) {
 		case F_SETFD:
 			tprintf(", ");
 			printflags(fdflags, tcp->u_arg[2], "FD_???");
 			break;
 		case F_SETOWN: case F_DUPFD:
 			tprintf(", %ld", tcp->u_arg[2]);
 			break;
 		case F_SETFL:
 			tprintf(", ");
 			tprint_open_modes(tcp, tcp->u_arg[2]);
 			break;
 		case F_SETLK: case F_SETLKW:
 #ifdef F_FREESP
 		case F_FREESP:
 #endif
 			tprintf(", ");
 			printflock(tcp, tcp->u_arg[2], 0);
 			break;
 #if _LFS64_LARGEFILE
 #ifdef F_FREESP64
 		case F_FREESP64:
 #endif
 		/* Linux glibc defines SETLK64 as SETLK,
 		   even though the kernel has different values - as does Solaris. */
 #if defined(F_SETLK64) && F_SETLK64+0!=F_SETLK
 		case F_SETLK64:
 #endif
 #if defined(F_SETLKW64) && F_SETLKW64+0!=F_SETLKW
 		case F_SETLKW64:
 #endif
 			tprintf(", ");
 			printflock64(tcp, tcp->u_arg[2], 0);
 			break;
 #endif
 		}
 	}
 	else {
 		switch (tcp->u_arg[1]) {
 		case F_DUPFD:
 		case F_SETFD: case F_SETFL:
 		case F_SETLK: case F_SETLKW:
 		case F_SETOWN: case F_GETOWN:
 			break;
 		case F_GETFD:
 			if (syserror(tcp) || tcp->u_rval == 0)
 				return 0;
 			tcp->auxstr =
 				sprintflags("flags ", fdflags, tcp->u_rval);
 			return RVAL_HEX|RVAL_STR;
 		case F_GETFL:
 			if (syserror(tcp))
 				return 0;
 			tcp->auxstr = sprint_open_modes(tcp->u_rval);
 			return RVAL_HEX|RVAL_STR;
 		case F_GETLK:
 			tprintf(", ");
 			printflock(tcp, tcp->u_arg[2], 1);
 			break;
 #if _LFS64_LARGEFILE
 #if defined(F_GETLK64) && F_GETLK64+0!=F_GETLK
 		case F_GETLK64:
 #endif
 			tprintf(", ");
 			printflock64(tcp, tcp->u_arg[2], 1);
 			break;
 #endif
 		default:
 			tprintf(", %#lx", tcp->u_arg[2]);
 			break;
 		}
 	}
 	return 0;
 }

 #ifdef LOCK_SH

 int
 sys_flock(struct tcb *tcp)
 {
 	if (entering(tcp)) {
 		tprintf("%ld, ", tcp->u_arg[0]);
 		printflags(flockcmds, tcp->u_arg[1], "LOCK_???");
 	}
 	return 0;
 }
 #endif /* LOCK_SH */

 int
 sys_close(struct tcb *tcp)
 {
 	if (entering(tcp)) {
 		tprintf("%ld", tcp->u_arg[0]);
 	}
 	return 0;
 }

 int
 sys_dup(struct tcb *tcp)
 {
 	if (entering(tcp)) {
 		tprintf("%ld", tcp->u_arg[0]);
 	}
 	return 0;
 }

 static int
 do_dup2(struct tcb *tcp, int flags_arg)
 {
 	if (entering(tcp)) {
 		tprintf("%ld, %ld", tcp->u_arg[0], tcp->u_arg[1]);
 		if (flags_arg >= 0) {
 			tprintf(", ");
 			printflags(open_mode_flags, tcp->u_arg[flags_arg], "O_???");
 		}
 	}
 	return 0;
 }

 int
 sys_dup2(struct tcb *tcp)
 {
 	return do_dup2(tcp, -1);
 }

 #ifdef LINUX
 int
 sys_dup3(struct tcb *tcp)
 {
 	return do_dup2(tcp, 2);
 }
 #endif

 #if defined(ALPHA) || defined(FREEBSD) || defined(SUNOS4)
 int
 sys_getdtablesize(struct tcb *tcp)
 {
 	return 0;
 }
 #endif /* ALPHA || FREEBSD || SUNOS4 */

 static int
 decode_select(struct tcb *tcp, long *args, enum bitness_t bitness)
 {
 	int i, j, nfds;
 	unsigned int fdsize = ((((args[0] + 7) / 8) + sizeof(long) - 1)
 			       & -sizeof(long));
 	fd_set *fds;
 	static char outstr[1024];
 	char *sep;
 	long arg;

 	if (entering(tcp)) {
 		fds = (fd_set *) malloc(fdsize);
 		if (fds == NULL)
 			fprintf(stderr, "out of memory\n");
 		nfds = args[0];
 		tprintf("%d", nfds);
 		for (i = 0; i < 3; i++) {
 			arg = args[i+1];
 			if (arg == 0) {
 				tprintf(", NULL");
 				continue;
 			}
 			if (fds == NULL || !verbose(tcp)) {
 				tprintf(", %#lx", arg);
 				continue;
 			}
 			if (umoven(tcp, arg, fdsize, (char *) fds) < 0) {
 				tprintf(", [?]");
 				continue;
 			}
 			tprintf(", [");
 			for (j = 0, sep = ""; j < nfds; j++) {
 				if (FD_ISSET(j, fds)) {
 					tprintf("%s%u", sep, j);
 					sep = " ";
 				}
 			}
 			tprintf("]");
 		}
 		free(fds);
 		tprintf(", ");
 		printtv_bitness(tcp, args[4], bitness, 0);
 	}
 	else
 	{
 		unsigned int cumlen = 0;
 		char *sep = "";

 		if (syserror(tcp))
 			return 0;

 		if ((nfds = tcp->u_rval) == 0) {
 			tcp->auxstr = "Timeout";
 			return RVAL_STR;
 		}

 		fds = (fd_set *) malloc(fdsize);
 		if (fds == NULL)
 			fprintf(stderr, "out of memory\n");

 		outstr[0] = '\0';
 		for (i = 0; i < 3; i++) {
 			int first = 1;
 			char str[20];

 			tcp->auxstr = outstr;
 			arg = args[i+1];
 			if (fds == NULL || !arg ||
 			    umoven(tcp, arg, fdsize, (char *) fds) < 0)
 				continue;
 			for (j = 0; j < args[0]; j++) {
 				if (FD_ISSET(j, fds)) {
 					if (first) {
 						sprintf(str, "%s%s [%u", sep,
 							i == 0 ? "in" :
 							i == 1 ? "out" :
 							"except", j);
 						first = 0;
 						sep = ", ";
 					}
 					else
 						sprintf(str, " %u", j);
 					cumlen += strlen(str);
 					if (cumlen < sizeof(outstr))
 						strcat(outstr, str);
 					nfds--;
 				}
 			}
 			if (cumlen)
 				strcat(outstr, "]");
 			if (nfds == 0)
 				break;
 		}
 		free(fds);
 #ifdef LINUX
 		/* This contains no useful information on SunOS.  */
 		if (args[4]) {
 			char str[128];

 			sprintf(str, "%sleft ", sep);
 			sprinttv(tcp, args[4], bitness, str + strlen(str));
 			if ((cumlen += strlen(str)) < sizeof(outstr))
 				strcat(outstr, str);
 		}
 #endif /* LINUX */
 		return RVAL_STR;
 	}
 	return 0;
 }

 #ifdef LINUX

 int
 sys_oldselect(struct tcb *tcp)
 {
 	long args[5];

 	if (umoven(tcp, tcp->u_arg[0], sizeof args, (char *) args) < 0) {
 		tprintf("[...]");
 		return 0;
 	}
 	return decode_select(tcp, args, BITNESS_CURRENT);
 }

 #ifdef ALPHA
 int
 sys_osf_select(struct tcb *tcp)
 {
 	long *args = tcp->u_arg;
 	return decode_select(tcp, args, BITNESS_32);
 }
 #endif

 static const struct xlat epollctls[] = {
 #ifdef EPOLL_CTL_ADD
 	{ EPOLL_CTL_ADD,	"EPOLL_CTL_ADD"	},
 #endif
 #ifdef EPOLL_CTL_MOD
 	{ EPOLL_CTL_MOD,	"EPOLL_CTL_MOD"	},
 #endif
 #ifdef EPOLL_CTL_DEL
 	{ EPOLL_CTL_DEL,	"EPOLL_CTL_DEL"	},
 #endif
 	{ 0,			NULL		}
 };

 static const struct xlat epollevents[] = {
 #ifdef EPOLLIN
 	{ EPOLLIN,	"EPOLLIN"	},
 #endif
 #ifdef EPOLLPRI
 	{ EPOLLPRI,	"EPOLLPRI"	},
 #endif
 #ifdef EPOLLOUT
 	{ EPOLLOUT,	"EPOLLOUT"	},
 #endif
 #ifdef EPOLLRDNORM
 	{ EPOLLRDNORM,	"EPOLLRDNORM"	},
 #endif
 #ifdef EPOLLRDBAND
 	{ EPOLLRDBAND,	"EPOLLRDBAND"	},
 #endif
 #ifdef EPOLLWRNORM
 	{ EPOLLWRNORM,	"EPOLLWRNORM"	},
 #endif
 #ifdef EPOLLWRBAND
 	{ EPOLLWRBAND,	"EPOLLWRBAND"	},
 #endif
 #ifdef EPOLLMSG
 	{ EPOLLMSG,	"EPOLLMSG"	},
 #endif
 #ifdef EPOLLERR
 	{ EPOLLERR,	"EPOLLERR"	},
 #endif
 #ifdef EPOLLHUP
 	{ EPOLLHUP,	"EPOLLHUP"	},
 #endif
 #ifdef EPOLLONESHOT
 	{ EPOLLONESHOT,	"EPOLLONESHOT"	},
 #endif
 #ifdef EPOLLET
 	{ EPOLLET,	"EPOLLET"	},
 #endif
 	{ 0,		NULL		}
 };

 int
 sys_epoll_create(struct tcb *tcp)
 {
 	if (entering(tcp))
 		tprintf("%ld", tcp->u_arg[0]);
 	return 0;
 }

 int
 sys_epoll_create1(struct tcb *tcp)
 {
 	if (entering(tcp))
 		printflags(open_mode_flags, tcp->u_arg[0], "O_???");
 	return 0;
 }

 #ifdef HAVE_SYS_EPOLL_H
 static void
 print_epoll_event(struct epoll_event *ev)
 {
 	tprintf("{");
 	printflags(epollevents, ev->events, "EPOLL???");
 	/* We cannot know what format the program uses, so print u32 and u64
 	   which will cover every value.  */
 	tprintf(", {u32=%" PRIu32 ", u64=%" PRIu64 "}}",
 		ev->data.u32, ev->data.u64);
 }
 #endif

 int
 sys_epoll_ctl(struct tcb *tcp)
 {
 	if (entering(tcp)) {
 		tprintf("%ld, ", tcp->u_arg[0]);
 		printxval(epollctls, tcp->u_arg[1], "EPOLL_CTL_???");
 		tprintf(", %ld, ", tcp->u_arg[2]);
 		if (tcp->u_arg[3] == 0)
 			tprintf("NULL");
 		else {
 #ifdef HAVE_SYS_EPOLL_H
 			struct epoll_event ev;
 			if (umove(tcp, tcp->u_arg[3], &ev) == 0)
 				print_epoll_event(&ev);
 			else
 #endif
 				tprintf("{...}");
 		}
 	}
 	return 0;
 }

 static void
 epoll_wait_common(struct tcb *tcp)
 {
 	if (entering(tcp))
 		tprintf("%ld, ", tcp->u_arg[0]);
 	else {
 		if (syserror(tcp))
 			tprintf("%lx", tcp->u_arg[1]);
 		else if (tcp->u_rval == 0)
 			tprintf("{}");
 		else {
 #ifdef HAVE_SYS_EPOLL_H
 			struct epoll_event ev, *start, *cur, *end;
 			int failed = 0;

 			tprintf("{");
 			start = (struct epoll_event *) tcp->u_arg[1];
 			end = start + tcp->u_rval;
 			for (cur = start; cur < end; ++cur) {
 				if (cur > start)
 					tprintf(", ");
 				if (umove(tcp, (long) cur, &ev) == 0)
 					print_epoll_event(&ev);
 				else {
 					tprintf("?");
 					failed = 1;
 					break;
 				}
 			}
 			tprintf("}");
 			if (failed)
 				tprintf(" %#lx", (long) start);
 #else
 			tprintf("{...}");
 #endif
 		}
 		tprintf(", %ld, %ld", tcp->u_arg[2], tcp->u_arg[3]);
 	}
 }

 int
 sys_epoll_wait(struct tcb *tcp)
 {
 	epoll_wait_common(tcp);
 	return 0;
 }

 int
 sys_epoll_pwait(struct tcb *tcp)
 {
 	epoll_wait_common(tcp);
 	if (exiting(tcp))
 		print_sigset(tcp, tcp->u_arg[4], 0);
 	return 0;
 }

 int
 sys_io_setup(struct tcb *tcp)
 {
 	if (entering(tcp))
 		tprintf("%ld, ", tcp->u_arg[0]);
 	else {
 		if (syserror(tcp))
 			tprintf("0x%0lx", tcp->u_arg[1]);
 		else {
 			unsigned long user_id;
 			if (umove(tcp, tcp->u_arg[1], &user_id) == 0)
 				tprintf("{%lu}", user_id);
 			else
 				tprintf("{...}");
 		}
 	}
 	return 0;
 }

 int
 sys_io_destroy(struct tcb *tcp)
 {
 	if (entering(tcp))
 		tprintf("%lu", tcp->u_arg[0]);
 	return 0;
 }

 int
 sys_io_submit(struct tcb *tcp)
 {
 	long nr;
 	if (entering(tcp)) {
 		tprintf("%lu, %ld, ", tcp->u_arg[0], tcp->u_arg[1]);
 		nr = tcp->u_arg[1];
 		/* and if nr is negative? */
 		if (nr == 0)
 			tprintf("{}");
 		else {
 #ifdef HAVE_LIBAIO_H
 			long i;
 			struct iocb *iocbp, **iocbs = (void *)tcp->u_arg[2];

 			for (i = 0; i < nr; i++, iocbs++) {
 				struct iocb iocb;
 				if (i == 0)
 					tprintf("{");
 				else
 					tprintf(", ");

 				if (umove(tcp, (unsigned long)iocbs, &iocbp) ||
 				    umove(tcp, (unsigned long)iocbp, &iocb)) {
 					tprintf("{...}");
 					continue;
 				}
 				tprintf("{%p, %u, %hu, %hu, %d}",
 					iocb.data, iocb.key,
 					iocb.aio_lio_opcode,
 					iocb.aio_reqprio, iocb.aio_fildes);
 			}
 			if (i)
 				tprintf("}");
 #else
 			tprintf("{...}");
 #endif
 		}
 	}
 	return 0;
 }

 int
 sys_io_cancel(struct tcb *tcp)
 {
 	if (entering(tcp)) {
 #ifdef HAVE_LIBAIO_H
 		struct iocb iocb;
 #endif
 		tprintf("%lu, ", tcp->u_arg[0]);
 #ifdef HAVE_LIBAIO_H
 		if (umove(tcp, tcp->u_arg[1], &iocb) == 0) {
 			tprintf("{%p, %u, %hu, %hu, %d}, ",
 				iocb.data, iocb.key,
 				iocb.aio_lio_opcode,
 				iocb.aio_reqprio, iocb.aio_fildes);
 		} else
 #endif
 			tprintf("{...}, ");
 	} else {
 		if (tcp->u_rval < 0)
 			tprintf("{...}");
 		else {
 #ifdef HAVE_LIBAIO_H
 			struct io_event event;
 			if (umove(tcp, tcp->u_arg[2], &event) == 0)
 				tprintf("{%p, %p, %ld, %ld}",
 					event.data, event.obj,
 					event.res, event.res2);
 			else
 #endif
 				tprintf("{...}");
 		}
 	}
 	return 0;
 }

 int
 sys_io_getevents(struct tcb *tcp)
 {
 	if (entering(tcp)) {
 		tprintf("%ld, %ld, %ld, ", tcp->u_arg[0], tcp->u_arg[1],
 			tcp->u_arg[2]);
 	} else {
 		if (tcp->u_rval == 0) {
 			tprintf("{}");
 		} else  {
 #ifdef HAVE_LIBAIO_H
 			struct io_event *events = (void *)tcp->u_arg[3];
 			long i, nr = tcp->u_rval;

 			for (i = 0; i < nr; i++, events++) {
 				struct io_event event;

 				if (i == 0)
 					tprintf("{");
 				else
 					tprintf(", ");

 				if (umove(tcp, (unsigned long)events, &event) != 0) {
 					tprintf("{...}");
 					continue;
 				}
 				tprintf("{%p, %p, %ld, %ld}", event.data,
 					event.obj, event.res, event.res2);
 			}
 			tprintf("}, ");
 #else
 				tprintf("{...}");
 #endif
 		}

 		print_timespec(tcp, tcp->u_arg[4]);
 	}
 	return 0;
 }
 #endif /* LINUX */

 int
 sys_select(struct tcb *tcp)
 {
 	return decode_select(tcp, tcp->u_arg, BITNESS_CURRENT);
 }

 #ifdef LINUX
 int
 sys_pselect6(struct tcb *tcp)
 {
 	int rc = decode_select(tcp, tcp->u_arg, BITNESS_CURRENT);
 	if (entering(tcp)) {
 		struct {
 			void *ss;
 			unsigned long len;
 		} data;
 		if (umove(tcp, tcp->u_arg[5], &data) < 0)
 			tprintf(", %#lx", tcp->u_arg[5]);
 		else {
 			tprintf(", {");
 			if (data.len < sizeof(long))
 				tprintf("%#lx", (long)data.ss);
 			else
 				print_sigset(tcp, (long)data.ss, 0);
 			tprintf(", %lu}", data.len);
 		}
 	}
 	return rc;
 }

 static int
 do_eventfd(struct tcb *tcp, int flags_arg)
 {
 	if (entering(tcp)) {
 		tprintf("%lu", tcp->u_arg[0]);
 		if (flags_arg >= 0) {
 			tprintf(", ");
 			printflags(open_mode_flags, tcp->u_arg[flags_arg], "O_???");
 		}
 	}
 	return 0;
 }

 int
 sys_eventfd(struct tcb *tcp)
 {
 	return do_eventfd(tcp, -1);
 }

 int
 sys_eventfd2(struct tcb *tcp)
 {
 	return do_eventfd(tcp, 1);
 }
 #endif
	/*
	* Copyright (c) 1991, 1992 Paul Kranenburg <pk@cs.few.eur.nl>
	* Copyright (c) 1993 Branko Lankester <branko@hacktic.nl>
	* Copyright (c) 1993, 1994, 1995, 1996 Rick Sladkey <jrs@world.std.com>
	* Copyright (c) 1996-1999 Wichert Akkerman <wichert@cistron.nl>
	* All rights reserved.
	*
	* Redistribution and use in source and binary forms, with or without
	* modification, are permitted provided that the following conditions
	* are met:
	* 1. Redistributions of source code must retain the above copyright
	* notice, this list of conditions and the following disclaimer.
	* 2. Redistributions in binary form must reproduce the above copyright
	* notice, this list of conditions and the following disclaimer in the
	* documentation and/or other materials provided with the distribution.
	* 3. The name of the author may not be used to endorse or promote products
	* derived from this software without specific prior written permission.
	*
	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
	* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
	* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
	* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
	* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
	* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
	* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
	*
	* $Id$
	*/

	#include "defs.h"

	#include <fcntl.h>
	#include <sys/file.h>
	#ifdef LINUX
	#include <inttypes.h>
	#endif
	#ifdef HAVE_SYS_EPOLL_H
	#include <sys/epoll.h>
	#endif
	#ifdef HAVE_LIBAIO_H
	#include <libaio.h>
	#endif

	#if HAVE_LONG_LONG_OFF_T
	/*
	* Hacks for systems that have a long long off_t
	*/
	#define flock64 flock /* Horrid hack */
	#define printflock printflock64 /* Horrider hack */
	#endif


	static const struct xlat fcntlcmds[] = {
	{ F_DUPFD, "F_DUPFD" },
	{ F_GETFD, "F_GETFD" },
	{ F_SETFD, "F_SETFD" },
	{ F_GETFL, "F_GETFL" },
	{ F_SETFL, "F_SETFL" },
	{ F_GETLK, "F_GETLK" },
	{ F_SETLK, "F_SETLK" },
	{ F_SETLKW, "F_SETLKW" },
	{ F_GETOWN, "F_GETOWN" },
	{ F_SETOWN, "F_SETOWN" },
	#ifdef F_RSETLK
	{ F_RSETLK, "F_RSETLK" },
	#endif
	#ifdef F_RSETLKW
	{ F_RSETLKW, "F_RSETLKW" },
	#endif
	#ifdef F_RGETLK
	{ F_RGETLK, "F_RGETLK" },
	#endif
	#ifdef F_CNVT
	{ F_CNVT, "F_CNVT" },
	#endif
	#ifdef F_SETSIG
	{ F_SETSIG, "F_SETSIG" },
	#endif
	#ifdef F_GETSIG
	{ F_GETSIG, "F_GETSIG" },
	#endif
	#ifdef F_CHKFL
	{ F_CHKFL, "F_CHKFL" },
	#endif
	#ifdef F_DUP2FD
	{ F_DUP2FD, "F_DUP2FD" },
	#endif
	#ifdef F_ALLOCSP
	{ F_ALLOCSP, "F_ALLOCSP" },
	#endif
	#ifdef F_ISSTREAM
	{ F_ISSTREAM, "F_ISSTREAM" },
	#endif
	#ifdef F_PRIV
	{ F_PRIV, "F_PRIV" },
	#endif
	#ifdef F_NPRIV
	{ F_NPRIV, "F_NPRIV" },
	#endif
	#ifdef F_QUOTACL
	{ F_QUOTACL, "F_QUOTACL" },
	#endif
	#ifdef F_BLOCKS
	{ F_BLOCKS, "F_BLOCKS" },
	#endif
	#ifdef F_BLKSIZE
	{ F_BLKSIZE, "F_BLKSIZE" },
	#endif
	#ifdef F_GETOWN
	{ F_GETOWN, "F_GETOWN" },
	#endif
	#ifdef F_SETOWN
	{ F_SETOWN, "F_SETOWN" },
	#endif
	#ifdef F_REVOKE
	{ F_REVOKE, "F_REVOKE" },
	#endif
	#ifdef F_SETLK
	{ F_SETLK, "F_SETLK" },
	#endif
	#ifdef F_SETLKW
	{ F_SETLKW, "F_SETLKW" },
	#endif
	#ifdef F_FREESP
	{ F_FREESP, "F_FREESP" },
	#endif
	#ifdef F_GETLK
	{ F_GETLK, "F_GETLK" },
	#endif
	#ifdef F_SETLK64
	{ F_SETLK64, "F_SETLK64" },
	#endif
	#ifdef F_SETLKW64
	{ F_SETLKW64, "F_SETLKW64" },
	#endif
	#ifdef F_FREESP64
	{ F_FREESP64, "F_FREESP64" },
	#endif
	#ifdef F_GETLK64
	{ F_GETLK64, "F_GETLK64" },
	#endif
	#ifdef F_SHARE
	{ F_SHARE, "F_SHARE" },
	#endif
	#ifdef F_UNSHARE
	{ F_UNSHARE, "F_UNSHARE" },
	#endif
	{ 0, NULL },
	};

	static const struct xlat fdflags[] = {
	#ifdef FD_CLOEXEC
	{ FD_CLOEXEC, "FD_CLOEXEC" },
	#endif
	{ 0, NULL },
	};

	#ifdef LOCK_SH

	static const struct xlat flockcmds[] = {
	{ LOCK_SH, "LOCK_SH" },
	{ LOCK_EX, "LOCK_EX" },
	{ LOCK_NB, "LOCK_NB" },
	{ LOCK_UN, "LOCK_UN" },
	{ 0, NULL },
	};

	#endif /* LOCK_SH */

	static const struct xlat lockfcmds[] = {
	{ F_RDLCK, "F_RDLCK" },
	{ F_WRLCK, "F_WRLCK" },
	{ F_UNLCK, "F_UNLCK" },
	#ifdef F_EXLCK
	{ F_EXLCK, "F_EXLCK" },
	#endif
	#ifdef F_SHLCK
	{ F_SHLCK, "F_SHLCK" },
	#endif
	{ 0, NULL },
	};

	static const struct xlat whence[] = {
	{ SEEK_SET, "SEEK_SET" },
	{ SEEK_CUR, "SEEK_CUR" },
	{ SEEK_END, "SEEK_END" },
	{ 0, NULL },
	};

	#ifndef HAVE_LONG_LONG_OFF_T
	/* fcntl/lockf */
	static void
	printflock(struct tcb *tcp, long addr, int getlk)
	{
	struct flock fl;

	if (personality_wordsize[current_personality] == sizeof(fl.l_start)) {
	if (umove(tcp, addr, &fl) < 0) {
	tprintf("{...}");
	return;
	}
	} else if (personality_wordsize[current_personality] == 4) {
	/* 32-bit x86 app on x86_64 and similar cases */
	struct {
	short int l_type;
	short int l_whence;
	int32_t l_start; /* off_t */
	int32_t l_len; /* off_t */
	int32_t l_pid; /* pid_t */
	} fl32;
	if (umove(tcp, addr, &fl32) < 0) {
	tprintf("{...}");
	return;
	}
	fl.l_type = fl32.l_type;
	fl.l_whence = fl32.l_whence;
	fl.l_start = fl32.l_start;
	fl.l_len = fl32.l_len;
	fl.l_pid = fl32.l_pid;
	} else {
	/* let people know we have a problem here */
	tprintf("{ <decode error: unsupported wordsize %d> }",
	personality_wordsize[current_personality]);
	return;
	}
	tprintf("{type=");
	printxval(lockfcmds, fl.l_type, "F_???");
	tprintf(", whence=");
	printxval(whence, fl.l_whence, "SEEK_???");
	tprintf(", start=%ld, len=%ld", fl.l_start, fl.l_len);
	if (getlk)
	tprintf(", pid=%lu}", (unsigned long) fl.l_pid);
	else
	tprintf("}");
	}
	#endif

	#if _LFS64_LARGEFILE \|\| HAVE_LONG_LONG_OFF_T
	/* fcntl/lockf */
	static void
	printflock64(struct tcb *tcp, long addr, int getlk)
	{
	struct flock64 fl;

	if (umove(tcp, addr, &fl) < 0) {
	tprintf("{...}");
	return;
	}
	tprintf("{type=");
	printxval(lockfcmds, fl.l_type, "F_???");
	tprintf(", whence=");
	printxval(whence, fl.l_whence, "SEEK_???");
	tprintf(", start=%lld, len=%lld", (long long) fl.l_start, (long long) fl.l_len);
	if (getlk)
	tprintf(", pid=%lu}", (unsigned long) fl.l_pid);
	else
	tprintf("}");
	}
	#endif

	/*
	* low bits of the open(2) flags define access mode,
	* other bits are real flags.
	*/
	static const char *
	sprint_open_modes(mode_t flags)
	{
	static char outstr[1024];
	const char *str = xlookup(open_access_modes, flags & 3);
	const char *sep = "";
	const struct xlat *x;

	strcpy(outstr, "flags ");
	if (str) {
	strcat(outstr, str);
	flags &= ~3;
	if (!flags)
	return outstr;
	strcat(outstr, "\|");
	}

	for (x = open_mode_flags; x->str; x++) {
	if ((flags & x->val) == x->val) {
	sprintf(outstr + strlen(outstr),
	"%s%s", sep, x->str);
	sep = "\|";
	flags &= ~x->val;
	}
	}
	if (flags)
	sprintf(outstr + strlen(outstr), "%s%#x", sep, flags);
	return outstr;
	}

	int
	sys_fcntl(struct tcb *tcp)
	{
	if (entering(tcp)) {
	tprintf("%ld, ", tcp->u_arg[0]);
	printxval(fcntlcmds, tcp->u_arg[1], "F_???");
	switch (tcp->u_arg[1]) {
	case F_SETFD:
	tprintf(", ");
	printflags(fdflags, tcp->u_arg[2], "FD_???");
	break;
	case F_SETOWN: case F_DUPFD:
	tprintf(", %ld", tcp->u_arg[2]);
	break;
	case F_SETFL:
	tprintf(", ");
	tprint_open_modes(tcp, tcp->u_arg[2]);
	break;
	case F_SETLK: case F_SETLKW:
	#ifdef F_FREESP
	case F_FREESP:
	#endif
	tprintf(", ");
	printflock(tcp, tcp->u_arg[2], 0);
	break;
	#if _LFS64_LARGEFILE
	#ifdef F_FREESP64
	case F_FREESP64:
	#endif
	/* Linux glibc defines SETLK64 as SETLK,
	even though the kernel has different values - as does Solaris. */
	#if defined(F_SETLK64) && F_SETLK64+0!=F_SETLK
	case F_SETLK64:
	#endif
	#if defined(F_SETLKW64) && F_SETLKW64+0!=F_SETLKW
	case F_SETLKW64:
	#endif
	tprintf(", ");
	printflock64(tcp, tcp->u_arg[2], 0);
	break;
	#endif
	}
	}
	else {
	switch (tcp->u_arg[1]) {
	case F_DUPFD:
	case F_SETFD: case F_SETFL:
	case F_SETLK: case F_SETLKW:
	case F_SETOWN: case F_GETOWN:
	break;
	case F_GETFD:
	if (syserror(tcp) \|\| tcp->u_rval == 0)
	return 0;
	tcp->auxstr =
	sprintflags("flags ", fdflags, tcp->u_rval);
	return RVAL_HEX\|RVAL_STR;
	case F_GETFL:
	if (syserror(tcp))
	return 0;
	tcp->auxstr = sprint_open_modes(tcp->u_rval);
	return RVAL_HEX\|RVAL_STR;
	case F_GETLK:
	tprintf(", ");
	printflock(tcp, tcp->u_arg[2], 1);
	break;
	#if _LFS64_LARGEFILE
	#if defined(F_GETLK64) && F_GETLK64+0!=F_GETLK
	case F_GETLK64:
	#endif
	tprintf(", ");
	printflock64(tcp, tcp->u_arg[2], 1);
	break;
	#endif
	default:
	tprintf(", %#lx", tcp->u_arg[2]);
	break;
	}
	}
	return 0;
	}

	#ifdef LOCK_SH

	int
	sys_flock(struct tcb *tcp)
	{
	if (entering(tcp)) {
	tprintf("%ld, ", tcp->u_arg[0]);
	printflags(flockcmds, tcp->u_arg[1], "LOCK_???");
	}
	return 0;
	}
	#endif /* LOCK_SH */

	int
	sys_close(struct tcb *tcp)
	{
	if (entering(tcp)) {
	tprintf("%ld", tcp->u_arg[0]);
	}
	return 0;
	}

	int
	sys_dup(struct tcb *tcp)
	{
	if (entering(tcp)) {
	tprintf("%ld", tcp->u_arg[0]);
	}
	return 0;
	}

	static int
	do_dup2(struct tcb *tcp, int flags_arg)
	{
	if (entering(tcp)) {
	tprintf("%ld, %ld", tcp->u_arg[0], tcp->u_arg[1]);
	if (flags_arg >= 0) {
	tprintf(", ");
	printflags(open_mode_flags, tcp->u_arg[flags_arg], "O_???");
	}
	}
	return 0;
	}

	int
	sys_dup2(struct tcb *tcp)
	{
	return do_dup2(tcp, -1);
	}

	#ifdef LINUX
	int
	sys_dup3(struct tcb *tcp)
	{
	return do_dup2(tcp, 2);
	}
	#endif

	#if defined(ALPHA) \|\| defined(FREEBSD) \|\| defined(SUNOS4)
	int
	sys_getdtablesize(struct tcb *tcp)
	{
	return 0;
	}
	#endif /* ALPHA \|\| FREEBSD \|\| SUNOS4 */

	static int
	decode_select(struct tcb tcp, long args, enum bitness_t bitness)
	{
	int i, j, nfds;
	unsigned int fdsize = ((((args[0] + 7) / 8) + sizeof(long) - 1)
	& -sizeof(long));
	fd_set *fds;
	static char outstr[1024];
	char *sep;
	long arg;

	if (entering(tcp)) {
	fds = (fd_set *) malloc(fdsize);
	if (fds == NULL)
	fprintf(stderr, "out of memory\n");
	nfds = args[0];
	tprintf("%d", nfds);
	for (i = 0; i < 3; i++) {
	arg = args[i+1];
	if (arg == 0) {
	tprintf(", NULL");
	continue;
	}
	if (fds == NULL \|\| !verbose(tcp)) {
	tprintf(", %#lx", arg);
	continue;
	}
	if (umoven(tcp, arg, fdsize, (char *) fds) < 0) {
	tprintf(", [?]");
	continue;
	}
	tprintf(", [");
	for (j = 0, sep = ""; j < nfds; j++) {
	if (FD_ISSET(j, fds)) {
	tprintf("%s%u", sep, j);
	sep = " ";
	}
	}
	tprintf("]");
	}
	free(fds);
	tprintf(", ");
	printtv_bitness(tcp, args[4], bitness, 0);
	}
	else
	{
	unsigned int cumlen = 0;
	char *sep = "";

	if (syserror(tcp))
	return 0;

	if ((nfds = tcp->u_rval) == 0) {
	tcp->auxstr = "Timeout";
	return RVAL_STR;
	}

	fds = (fd_set *) malloc(fdsize);
	if (fds == NULL)
	fprintf(stderr, "out of memory\n");

	outstr[0] = '\0';
	for (i = 0; i < 3; i++) {
	int first = 1;
	char str[20];

	tcp->auxstr = outstr;
	arg = args[i+1];
	if (fds == NULL \|\| !arg \|\|
	umoven(tcp, arg, fdsize, (char *) fds) < 0)
	continue;
	for (j = 0; j < args[0]; j++) {
	if (FD_ISSET(j, fds)) {
	if (first) {
	sprintf(str, "%s%s [%u", sep,
	i == 0 ? "in" :
	i == 1 ? "out" :
	"except", j);
	first = 0;
	sep = ", ";
	}
	else
	sprintf(str, " %u", j);
	cumlen += strlen(str);
	if (cumlen < sizeof(outstr))
	strcat(outstr, str);
	nfds--;
	}
	}
	if (cumlen)
	strcat(outstr, "]");
	if (nfds == 0)
	break;
	}
	free(fds);
	#ifdef LINUX
	/* This contains no useful information on SunOS. */
	if (args[4]) {
	char str[128];

	sprintf(str, "%sleft ", sep);
	sprinttv(tcp, args[4], bitness, str + strlen(str));
	if ((cumlen += strlen(str)) < sizeof(outstr))
	strcat(outstr, str);
	}
	#endif /* LINUX */
	return RVAL_STR;
	}
	return 0;
	}

	#ifdef LINUX

	int
	sys_oldselect(struct tcb *tcp)
	{
	long args[5];

	if (umoven(tcp, tcp->u_arg[0], sizeof args, (char *) args) < 0) {
	tprintf("[...]");
	return 0;
	}
	return decode_select(tcp, args, BITNESS_CURRENT);
	}

	#ifdef ALPHA
	int
	sys_osf_select(struct tcb *tcp)
	{
	long *args = tcp->u_arg;
	return decode_select(tcp, args, BITNESS_32);
	}
	#endif

	static const struct xlat epollctls[] = {
	#ifdef EPOLL_CTL_ADD
	{ EPOLL_CTL_ADD, "EPOLL_CTL_ADD" },
	#endif
	#ifdef EPOLL_CTL_MOD
	{ EPOLL_CTL_MOD, "EPOLL_CTL_MOD" },
	#endif
	#ifdef EPOLL_CTL_DEL
	{ EPOLL_CTL_DEL, "EPOLL_CTL_DEL" },
	#endif
	{ 0, NULL }
	};

	static const struct xlat epollevents[] = {
	#ifdef EPOLLIN
	{ EPOLLIN, "EPOLLIN" },
	#endif
	#ifdef EPOLLPRI
	{ EPOLLPRI, "EPOLLPRI" },
	#endif
	#ifdef EPOLLOUT
	{ EPOLLOUT, "EPOLLOUT" },
	#endif
	#ifdef EPOLLRDNORM
	{ EPOLLRDNORM, "EPOLLRDNORM" },
	#endif
	#ifdef EPOLLRDBAND
	{ EPOLLRDBAND, "EPOLLRDBAND" },
	#endif
	#ifdef EPOLLWRNORM
	{ EPOLLWRNORM, "EPOLLWRNORM" },
	#endif
	#ifdef EPOLLWRBAND
	{ EPOLLWRBAND, "EPOLLWRBAND" },
	#endif
	#ifdef EPOLLMSG
	{ EPOLLMSG, "EPOLLMSG" },
	#endif
	#ifdef EPOLLERR
	{ EPOLLERR, "EPOLLERR" },
	#endif
	#ifdef EPOLLHUP
	{ EPOLLHUP, "EPOLLHUP" },
	#endif
	#ifdef EPOLLONESHOT
	{ EPOLLONESHOT, "EPOLLONESHOT" },
	#endif
	#ifdef EPOLLET
	{ EPOLLET, "EPOLLET" },
	#endif
	{ 0, NULL }
	};

	int
	sys_epoll_create(struct tcb *tcp)
	{
	if (entering(tcp))
	tprintf("%ld", tcp->u_arg[0]);
	return 0;
	}

	int
	sys_epoll_create1(struct tcb *tcp)
	{
	if (entering(tcp))
	printflags(open_mode_flags, tcp->u_arg[0], "O_???");
	return 0;
	}

	#ifdef HAVE_SYS_EPOLL_H
	static void
	print_epoll_event(struct epoll_event *ev)
	{
	tprintf("{");
	printflags(epollevents, ev->events, "EPOLL???");
	/* We cannot know what format the program uses, so print u32 and u64
	which will cover every value. */
	tprintf(", {u32=%" PRIu32 ", u64=%" PRIu64 "}}",
	ev->data.u32, ev->data.u64);
	}
	#endif

	int
	sys_epoll_ctl(struct tcb *tcp)
	{
	if (entering(tcp)) {
	tprintf("%ld, ", tcp->u_arg[0]);
	printxval(epollctls, tcp->u_arg[1], "EPOLL_CTL_???");
	tprintf(", %ld, ", tcp->u_arg[2]);
	if (tcp->u_arg[3] == 0)
	tprintf("NULL");
	else {
	#ifdef HAVE_SYS_EPOLL_H
	struct epoll_event ev;
	if (umove(tcp, tcp->u_arg[3], &ev) == 0)
	print_epoll_event(&ev);
	else
	#endif
	tprintf("{...}");
	}
	}
	return 0;
	}

	static void
	epoll_wait_common(struct tcb *tcp)
	{
	if (entering(tcp))
	tprintf("%ld, ", tcp->u_arg[0]);
	else {
	if (syserror(tcp))
	tprintf("%lx", tcp->u_arg[1]);
	else if (tcp->u_rval == 0)
	tprintf("{}");
	else {
	#ifdef HAVE_SYS_EPOLL_H
	struct epoll_event ev, start, cur, *end;
	int failed = 0;

	tprintf("{");
	start = (struct epoll_event *) tcp->u_arg[1];
	end = start + tcp->u_rval;
	for (cur = start; cur < end; ++cur) {
	if (cur > start)
	tprintf(", ");
	if (umove(tcp, (long) cur, &ev) == 0)
	print_epoll_event(&ev);
	else {
	tprintf("?");
	failed = 1;
	break;
	}
	}
	tprintf("}");
	if (failed)
	tprintf(" %#lx", (long) start);
	#else
	tprintf("{...}");
	#endif
	}
	tprintf(", %ld, %ld", tcp->u_arg[2], tcp->u_arg[3]);
	}
	}

	int
	sys_epoll_wait(struct tcb *tcp)
	{
	epoll_wait_common(tcp);
	return 0;
	}

	int
	sys_epoll_pwait(struct tcb *tcp)
	{
	epoll_wait_common(tcp);
	if (exiting(tcp))
	print_sigset(tcp, tcp->u_arg[4], 0);
	return 0;
	}

	int
	sys_io_setup(struct tcb *tcp)
	{
	if (entering(tcp))
	tprintf("%ld, ", tcp->u_arg[0]);
	else {
	if (syserror(tcp))
	tprintf("0x%0lx", tcp->u_arg[1]);
	else {
	unsigned long user_id;
	if (umove(tcp, tcp->u_arg[1], &user_id) == 0)
	tprintf("{%lu}", user_id);
	else
	tprintf("{...}");
	}
	}
	return 0;
	}

	int
	sys_io_destroy(struct tcb *tcp)
	{
	if (entering(tcp))
	tprintf("%lu", tcp->u_arg[0]);
	return 0;
	}

	int
	sys_io_submit(struct tcb *tcp)
	{
	long nr;
	if (entering(tcp)) {
	tprintf("%lu, %ld, ", tcp->u_arg[0], tcp->u_arg[1]);
	nr = tcp->u_arg[1];
	/* and if nr is negative? */
	if (nr == 0)
	tprintf("{}");
	else {
	#ifdef HAVE_LIBAIO_H
	long i;
	struct iocb iocbp, iocbs = (void )tcp->u_arg[2];

	for (i = 0; i < nr; i++, iocbs++) {
	struct iocb iocb;
	if (i == 0)
	tprintf("{");
	else
	tprintf(", ");

	if (umove(tcp, (unsigned long)iocbs, &iocbp) \|\|
	umove(tcp, (unsigned long)iocbp, &iocb)) {
	tprintf("{...}");
	continue;
	}
	tprintf("{%p, %u, %hu, %hu, %d}",
	iocb.data, iocb.key,
	iocb.aio_lio_opcode,
	iocb.aio_reqprio, iocb.aio_fildes);
	}
	if (i)
	tprintf("}");
	#else
	tprintf("{...}");
	#endif
	}
	}
	return 0;
	}

	int
	sys_io_cancel(struct tcb *tcp)
	{
	if (entering(tcp)) {
	#ifdef HAVE_LIBAIO_H
	struct iocb iocb;
	#endif
	tprintf("%lu, ", tcp->u_arg[0]);
	#ifdef HAVE_LIBAIO_H
	if (umove(tcp, tcp->u_arg[1], &iocb) == 0) {
	tprintf("{%p, %u, %hu, %hu, %d}, ",
	iocb.data, iocb.key,
	iocb.aio_lio_opcode,
	iocb.aio_reqprio, iocb.aio_fildes);
	} else
	#endif
	tprintf("{...}, ");
	} else {
	if (tcp->u_rval < 0)
	tprintf("{...}");
	else {
	#ifdef HAVE_LIBAIO_H
	struct io_event event;
	if (umove(tcp, tcp->u_arg[2], &event) == 0)
	tprintf("{%p, %p, %ld, %ld}",
	event.data, event.obj,
	event.res, event.res2);
	else
	#endif
	tprintf("{...}");
	}
	}
	return 0;
	}

	int
	sys_io_getevents(struct tcb *tcp)
	{
	if (entering(tcp)) {
	tprintf("%ld, %ld, %ld, ", tcp->u_arg[0], tcp->u_arg[1],
	tcp->u_arg[2]);
	} else {
	if (tcp->u_rval == 0) {
	tprintf("{}");
	} else {
	#ifdef HAVE_LIBAIO_H
	struct io_event events = (void )tcp->u_arg[3];
	long i, nr = tcp->u_rval;

	for (i = 0; i < nr; i++, events++) {
	struct io_event event;

	if (i == 0)
	tprintf("{");
	else
	tprintf(", ");

	if (umove(tcp, (unsigned long)events, &event) != 0) {
	tprintf("{...}");
	continue;
	}
	tprintf("{%p, %p, %ld, %ld}", event.data,
	event.obj, event.res, event.res2);
	}
	tprintf("}, ");
	#else
	tprintf("{...}");
	#endif
	}

	print_timespec(tcp, tcp->u_arg[4]);
	}
	return 0;
	}
	#endif /* LINUX */

	int
	sys_select(struct tcb *tcp)
	{
	return decode_select(tcp, tcp->u_arg, BITNESS_CURRENT);
	}

	#ifdef LINUX
	int
	sys_pselect6(struct tcb *tcp)
	{
	int rc = decode_select(tcp, tcp->u_arg, BITNESS_CURRENT);
	if (entering(tcp)) {
	struct {
	void *ss;
	unsigned long len;
	} data;
	if (umove(tcp, tcp->u_arg[5], &data) < 0)
	tprintf(", %#lx", tcp->u_arg[5]);
	else {
	tprintf(", {");
	if (data.len < sizeof(long))
	tprintf("%#lx", (long)data.ss);
	else
	print_sigset(tcp, (long)data.ss, 0);
	tprintf(", %lu}", data.len);
	}
	}
	return rc;
	}

	static int
	do_eventfd(struct tcb *tcp, int flags_arg)
	{
	if (entering(tcp)) {
	tprintf("%lu", tcp->u_arg[0]);
	if (flags_arg >= 0) {
	tprintf(", ");
	printflags(open_mode_flags, tcp->u_arg[flags_arg], "O_???");
	}
	}
	return 0;
	}

	int
	sys_eventfd(struct tcb *tcp)
	{
	return do_eventfd(tcp, -1);
	}

	int
	sys_eventfd2(struct tcb *tcp)
	{
	return do_eventfd(tcp, 1);
	}
	#endif