X-Git-Url: https://granicus.if.org/sourcecode?a=blobdiff_plain;f=desc.c;h=d52afc43d2f7df176d965f87840983661a0f2712;hb=3245b5835170e226877cd9abaa4aa2e78991ff0e;hp=790b10bb1e5cbfc1c508dfaf17756e60d0f7c7ac;hpb=3138213bc9a827a372ad9f8009ebcc5d8797ce2d;p=strace

diff --git a/desc.c b/desc.c
index 790b10bb..d52afc43 100644
--- a/desc.c
+++ b/desc.c
@@ -3,6 +3,7 @@
  * 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>
+ * Copyright (c) 1999-2017 The strace developers.
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
@@ -26,965 +27,241 @@
  * 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
-#ifdef F_SETLEASE
-	{ F_SETLEASE,	"F_SETLEASE"	},
-#endif
-#ifdef F_GETLEASE
-	{ F_GETLEASE,	"F_GETLEASE"	},
-#endif
-#ifdef F_NOTIFY
-	{ F_NOTIFY,	"F_NOTIFY"	},
-#endif
-#ifdef F_DUPFD_CLOEXEC
-	{ F_DUPFD_CLOEXEC,"F_DUPFD_CLOEXEC"},
-#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		},
-};
-
-#ifdef F_NOTIFY
-static const struct xlat notifyflags[] = {
-#ifdef DN_ACCESS
-	{ DN_ACCESS,	"DN_ACCESS"	},
-#endif
-#ifdef DN_MODIFY
-	{ DN_MODIFY,	"DN_MODIFY"	},
-#endif
-#ifdef DN_CREATE
-	{ DN_CREATE,	"DN_CREATE"	},
-#endif
-#ifdef DN_DELETE
-	{ DN_DELETE,	"DN_DELETE"	},
-#endif
-#ifdef DN_RENAME
-	{ DN_RENAME,	"DN_RENAME"	},
-#endif
-#ifdef DN_ATTRIB
-	{ DN_ATTRIB,	"DN_ATTRIB"	},
-#endif
-#ifdef DN_MULTISHOT
-	{ DN_MULTISHOT,	"DN_MULTISHOT"	},
-#endif
-	{ 0,		NULL		},
-};
-#endif
-
-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 SUPPORTED_PERSONALITIES > 1
-	if (personality_wordsize[current_personality] != sizeof(fl.l_start)) {
-		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;
-		}
-	} else
-#endif
-	{
-		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=%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
-
-int
-sys_fcntl(struct tcb *tcp)
+SYS_FUNC(close)
 {
-	if (entering(tcp)) {
-		printfd(tcp, tcp->u_arg[0]);
-		tprintf(", ");
-		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:
-#ifdef F_DUPFD_CLOEXEC
-		case F_DUPFD_CLOEXEC:
-#endif
-			tprintf(", %ld", tcp->u_arg[2]);
-			break;
-		case F_SETFL:
-			tprintf(", ");
-			tprint_open_modes(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
-#ifdef F_NOTIFY
-		case F_NOTIFY:
-			tprintf(", ");
-			printflags(notifyflags, tcp->u_arg[2], "DN_???");
-			break;
-#endif
-#ifdef F_SETLEASE
-		case F_SETLEASE:
-			tprintf(", ");
-			printxval(lockfcmds, tcp->u_arg[2], "F_???");
-			break;
-#endif
-		}
-	}
-	else {
-		switch (tcp->u_arg[1]) {
-		case F_DUPFD:
-#ifdef F_DUPFD_CLOEXEC
-		case F_DUPFD_CLOEXEC:
-#endif
-		case F_SETFD: case F_SETFL:
-		case F_SETLK: case F_SETLKW:
-		case F_SETOWN: case F_GETOWN:
-#ifdef F_NOTIFY
-		case F_NOTIFY:
-#endif
-#ifdef F_SETLEASE
-		case F_SETLEASE:
-#endif
-			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
-#ifdef F_GETLEASE
-		case F_GETLEASE:
-			if (syserror(tcp))
-				return 0;
-			tcp->auxstr = xlookup(lockfcmds, tcp->u_rval);
-			return RVAL_HEX|RVAL_STR;
-#endif
-		default:
-			tprintf(", %#lx", tcp->u_arg[2]);
-			break;
-		}
-	}
-	return 0;
-}
-
-#ifdef LOCK_SH
+	printfd(tcp, tcp->u_arg[0]);
 
-int
-sys_flock(struct tcb *tcp)
-{
-	if (entering(tcp)) {
-		printfd(tcp, tcp->u_arg[0]);
-		tprintf(", ");
-		printflags(flockcmds, tcp->u_arg[1], "LOCK_???");
-	}
-	return 0;
+	return RVAL_DECODED;
 }
-#endif /* LOCK_SH */
 
-int
-sys_close(struct tcb *tcp)
+SYS_FUNC(dup)
 {
-	if (entering(tcp)) {
-		printfd(tcp, tcp->u_arg[0]);
-	}
-	return 0;
-}
+	printfd(tcp, tcp->u_arg[0]);
 
-int
-sys_dup(struct tcb *tcp)
-{
-	if (entering(tcp)) {
-		printfd(tcp, tcp->u_arg[0]);
-	}
-	return 0;
+	return RVAL_DECODED | RVAL_FD;
 }
 
 static int
 do_dup2(struct tcb *tcp, int flags_arg)
 {
-	if (entering(tcp)) {
-		printfd(tcp, tcp->u_arg[0]);
-		tprintf(", ");
-		printfd(tcp, tcp->u_arg[1]);
-		if (flags_arg >= 0) {
-			tprintf(", ");
-			printflags(open_mode_flags, tcp->u_arg[flags_arg], "O_???");
-		}
+	printfd(tcp, tcp->u_arg[0]);
+	tprints(", ");
+	printfd(tcp, tcp->u_arg[1]);
+	if (flags_arg >= 0) {
+		tprints(", ");
+		printflags(open_mode_flags, tcp->u_arg[flags_arg], "O_???");
 	}
-	return 0;
+
+	return RVAL_DECODED | RVAL_FD;
 }
 
-int
-sys_dup2(struct tcb *tcp)
+SYS_FUNC(dup2)
 {
 	return do_dup2(tcp, -1);
 }
 
-#ifdef LINUX
-int
-sys_dup3(struct tcb *tcp)
+SYS_FUNC(dup3)
 {
 	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)
+decode_select(struct tcb *const tcp, const kernel_ulong_t *const args,
+	      void (*const print_tv_ts) (struct tcb *, kernel_ulong_t),
+	      const char * (*const sprint_tv_ts) (struct tcb *, kernel_ulong_t))
 {
-	int i, j, nfds;
-	unsigned int fdsize = ((((args[0] + 7) / 8) + sizeof(long) - 1)
-			       & -sizeof(long));
-	fd_set *fds;
-	static char outstr[1024];
+	int i, j;
+	int nfds, fdsize;
+	fd_set *fds = NULL;
 	const char *sep;
-	long arg;
+	kernel_ulong_t addr;
+
+	/* Kernel truncates args[0] to int, we do the same. */
+	nfds = (int) args[0];
+
+	/* Kernel rejects negative nfds, so we don't parse it either. */
+	if (nfds < 0)
+		nfds = 0;
+
+	/* Beware of select(2^31-1, NULL, NULL, NULL) and similar... */
+	if (nfds > 1024*1024)
+		nfds = 1024*1024;
+
+	/*
+	 * We had bugs a-la "while (j < args[0])" and "umoven(args[0])" below.
+	 * Instead of args[0], use nfds for fd count, fdsize for array lengths.
+	 */
+	fdsize = (((nfds + 7) / 8) + current_wordsize-1) & -current_wordsize;
 
 	if (entering(tcp)) {
-		fds = (fd_set *) malloc(fdsize);
-		if (fds == NULL)
-			fprintf(stderr, "out of memory\n");
-		nfds = args[0];
-		tprintf("%d", nfds);
+		tprintf("%d", (int) args[0]);
+
+		if (verbose(tcp) && fdsize > 0)
+			fds = malloc(fdsize);
 		for (i = 0; i < 3; i++) {
-			arg = args[i+1];
-			if (arg == 0) {
-				tprintf(", NULL");
-				continue;
-			}
-			if (fds == NULL || !verbose(tcp)) {
-				tprintf(", %#lx", arg);
+			addr = args[i+1];
+			tprints(", ");
+			if (!fds) {
+				printaddr(addr);
 				continue;
 			}
-			if (umoven(tcp, arg, fdsize, (char *) fds) < 0) {
-				tprintf(", [?]");
+			if (umoven_or_printaddr(tcp, addr, fdsize, fds))
 				continue;
+			tprints("[");
+			for (j = 0, sep = "";; j++) {
+				j = next_set_bit(fds, j, nfds);
+				if (j < 0)
+					break;
+				tprints(sep);
+				printfd(tcp, j);
+				sep = " ";
 			}
-			tprintf(", [");
-			for (j = 0, sep = ""; j < nfds; j++) {
-				if (FD_ISSET(j, fds)) {
-					tprintf("%s", sep);
-					printfd(tcp, j);
-					sep = " ";
-				}
-			}
-			tprintf("]");
+			tprints("]");
 		}
 		free(fds);
-		tprintf(", ");
-		printtv_bitness(tcp, args[4], bitness, 0);
-	}
-	else
-	{
-		unsigned int cumlen = 0;
-		const char *sep = "";
+		tprints(", ");
+		print_tv_ts(tcp, args[4]);
+	} else {
+		static char outstr[1024];
+		char *outptr;
+#define end_outstr (outstr + sizeof(outstr))
+		int ready_fds;
 
 		if (syserror(tcp))
 			return 0;
 
-		if ((nfds = tcp->u_rval) == 0) {
+		ready_fds = tcp->u_rval;
+		if (ready_fds == 0) {
 			tcp->auxstr = "Timeout";
 			return RVAL_STR;
 		}
 
-		fds = (fd_set *) malloc(fdsize);
-		if (fds == NULL)
-			fprintf(stderr, "out of memory\n");
+		fds = malloc(fdsize);
 
-		outstr[0] = '\0';
-		for (i = 0; i < 3; i++) {
+		outptr = outstr;
+		sep = "";
+		for (i = 0; i < 3 && ready_fds > 0; i++) {
 			int first = 1;
 
-			tcp->auxstr = outstr;
-			arg = args[i+1];
-			if (fds == NULL || !arg ||
-			    umoven(tcp, arg, fdsize, (char *) fds) < 0)
+			addr = args[i+1];
+			if (!addr || !fds || umoven(tcp, addr, fdsize, fds) < 0)
 				continue;
-			for (j = 0; j < args[0]; j++) {
-				if (FD_ISSET(j, fds)) {
-					char str[11 + 3 * sizeof(int)];
-
+			for (j = 0;; j++) {
+				j = next_set_bit(fds, j, nfds);
+				if (j < 0)
+					break;
+				/* +2 chars needed at the end: ']',NUL */
+				if (outptr < end_outstr - (sizeof(", except [") + sizeof(int)*3 + 2)) {
 					if (first) {
-						sprintf(str, "%s%s [%u", sep,
-							i == 0 ? "in" :
-							i == 1 ? "out" :
-							"except", j);
+						outptr += sprintf(outptr, "%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--;
+					else {
+						outptr += sprintf(outptr, " %u", j);
+					}
 				}
+				if (--ready_fds == 0)
+					break;
 			}
-			if (cumlen)
-				strcat(outstr, "]");
-			if (nfds == 0)
-				break;
+			if (outptr != outstr)
+				*outptr++ = ']';
 		}
 		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);
+			const char *str = sprint_tv_ts(tcp, args[4]);
+			if (outptr + sizeof("left ") + strlen(sep) + strlen(str) < end_outstr) {
+				outptr += sprintf(outptr, "%sleft %s", sep, str);
+			}
 		}
-#endif /* LINUX */
+		*outptr = '\0';
+		tcp->auxstr = outstr;
 		return RVAL_STR;
+#undef end_outstr
 	}
 	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)
+SYS_FUNC(oldselect)
 {
-	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
+	kernel_ulong_t select_args[5];
+	unsigned int oldselect_args[5];
 
-int
-sys_epoll_ctl(struct tcb *tcp)
-{
-	if (entering(tcp)) {
-		printfd(tcp, tcp->u_arg[0]);
-		tprintf(", ");
-		printxval(epollctls, tcp->u_arg[1], "EPOLL_CTL_???");
-		tprintf(", ");
-		printfd(tcp, tcp->u_arg[2]);
-		tprintf(", ");
-		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("{...}");
+	if (sizeof(*select_args) == sizeof(*oldselect_args)) {
+		if (umove_or_printaddr(tcp, tcp->u_arg[0], &select_args)) {
+			return 0;
 		}
-	}
-	return 0;
-}
-
-static void
-epoll_wait_common(struct tcb *tcp)
-{
-	if (entering(tcp)) {
-		printfd(tcp, tcp->u_arg[0]);
-		tprintf(", ");
 	} 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)) {
-		tprintf(", ");
-		print_sigset(tcp, tcp->u_arg[4], 0);
-	}
-	return 0;
-}
+		unsigned int i;
 
-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("{...}");
+		if (umove_or_printaddr(tcp, tcp->u_arg[0], &oldselect_args)) {
+			return 0;
 		}
-	}
-	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
+		for (i = 0; i < 5; ++i) {
+			select_args[i] = oldselect_args[i];
 		}
 	}
-	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;
+	return decode_select(tcp, select_args, print_timeval, sprint_timeval);
 }
 
-int
-sys_io_getevents(struct tcb *tcp)
+#ifdef ALPHA
+SYS_FUNC(osf_select)
 {
-	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;
+	return decode_select(tcp, tcp->u_arg, print_timeval32, sprint_timeval32);
 }
-#endif /* LINUX */
+#endif
 
-int
-sys_select(struct tcb *tcp)
+SYS_FUNC(select)
 {
-	return decode_select(tcp, tcp->u_arg, BITNESS_CURRENT);
+	return decode_select(tcp, tcp->u_arg, print_timeval, sprint_timeval);
 }
 
-#ifdef LINUX
-int
-sys_pselect6(struct tcb *tcp)
+static int
+umove_kulong_array_or_printaddr(struct tcb *const tcp, const kernel_ulong_t addr,
+				kernel_ulong_t *const ptr, const size_t n)
 {
-	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);
+#ifndef current_klongsize
+	if (current_klongsize < sizeof(*ptr)) {
+		uint32_t ptr32[n];
+		int r = umove_or_printaddr(tcp, addr, &ptr32);
+		if (!r) {
+			size_t i;
+
+			for (i = 0; i < n; ++i)
+				ptr[i] = ptr32[i];
 		}
+		return r;
 	}
-	return rc;
+#endif /* !current_klongsize */
+	return umoven_or_printaddr(tcp, addr, n * sizeof(*ptr), ptr);
 }
 
-static int
-do_eventfd(struct tcb *tcp, int flags_arg)
+SYS_FUNC(pselect6)
 {
+	int rc = decode_select(tcp, tcp->u_arg, print_timespec, sprint_timespec);
 	if (entering(tcp)) {
-		tprintf("%lu", tcp->u_arg[0]);
-		if (flags_arg >= 0) {
-			tprintf(", ");
-			printflags(open_mode_flags, tcp->u_arg[flags_arg], "O_???");
+		kernel_ulong_t data[2];
+
+		tprints(", ");
+		if (!umove_kulong_array_or_printaddr(tcp, tcp->u_arg[5],
+						     data, ARRAY_SIZE(data))) {
+			tprints("{");
+			/* NB: kernel requires data[1] == NSIG_BYTES */
+			print_sigset_addr_len(tcp, data[0], data[1]);
+			tprintf(", %" PRI_klu "}", data[1]);
 		}
 	}
-	return 0;
-}
-
-int
-sys_eventfd(struct tcb *tcp)
-{
-	return do_eventfd(tcp, -1);
-}
 
-int
-sys_eventfd2(struct tcb *tcp)
-{
-	return do_eventfd(tcp, 1);
+	return rc;
 }
-#endif