granicus.if.org Git - strace/blob - desc.c

   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
  56 static 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         { 0,            NULL            },
 152 };
 153
 154 static const struct xlat fdflags[] = {
 155 #ifdef FD_CLOEXEC
 156         { FD_CLOEXEC,   "FD_CLOEXEC"    },
 157 #endif
 158         { 0,            NULL            },
 159 };
 160
 161 #ifdef LOCK_SH
 162
 163 static const struct xlat flockcmds[] = {
 164         { LOCK_SH,      "LOCK_SH"       },
 165         { LOCK_EX,      "LOCK_EX"       },
 166         { LOCK_NB,      "LOCK_NB"       },
 167         { LOCK_UN,      "LOCK_UN"       },
 168         { 0,            NULL            },
 169 };
 170
 171 #endif /* LOCK_SH */
 172
 173 static const struct xlat lockfcmds[] = {
 174         { F_RDLCK,      "F_RDLCK"       },
 175         { F_WRLCK,      "F_WRLCK"       },
 176         { F_UNLCK,      "F_UNLCK"       },
 177 #ifdef F_EXLCK
 178         { F_EXLCK,      "F_EXLCK"       },
 179 #endif
 180 #ifdef F_SHLCK
 181         { F_SHLCK,      "F_SHLCK"       },
 182 #endif
 183         { 0,            NULL            },
 184 };
 185
 186 static const struct xlat whence[] = {
 187         { SEEK_SET,     "SEEK_SET"      },
 188         { SEEK_CUR,     "SEEK_CUR"      },
 189         { SEEK_END,     "SEEK_END"      },
 190         { 0,            NULL            },
 191 };
 192
 193 #ifndef HAVE_LONG_LONG_OFF_T
 194 /* fcntl/lockf */
 195 static void
 196 printflock(tcp, addr, getlk)
 197 struct tcb *tcp;
 198 long addr;
 199 int getlk;
 200 {
 201         struct flock fl;
 202
 203         if (umove(tcp, addr, &fl) < 0) {
 204                 tprintf("{...}");
 205                 return;
 206         }
 207         tprintf("{type=");
 208         printxval(lockfcmds, fl.l_type, "F_???");
 209         tprintf(", whence=");
 210         printxval(whence, fl.l_whence, "SEEK_???");
 211         tprintf(", start=%ld, len=%ld", fl.l_start, fl.l_len);
 212         if (getlk)
 213                 tprintf(", pid=%lu}", (unsigned long) fl.l_pid);
 214         else
 215                 tprintf("}");
 216 }
 217 #endif
 218
 219 #if _LFS64_LARGEFILE || HAVE_LONG_LONG_OFF_T
 220 /* fcntl/lockf */
 221 static void
 222 printflock64(tcp, addr, getlk)
 223 struct tcb *tcp;
 224 long addr;
 225 int getlk;
 226 {
 227         struct flock64 fl;
 228
 229         if (umove(tcp, addr, &fl) < 0) {
 230                 tprintf("{...}");
 231                 return;
 232         }
 233         tprintf("{type=");
 234         printxval(lockfcmds, fl.l_type, "F_???");
 235         tprintf(", whence=");
 236         printxval(whence, fl.l_whence, "SEEK_???");
 237         tprintf(", start=%lld, len=%lld", (long long) fl.l_start, (long long) fl.l_len);
 238         if (getlk)
 239                 tprintf(", pid=%lu}", (unsigned long) fl.l_pid);
 240         else
 241                 tprintf("}");
 242 }
 243 #endif
 244
 245 /*
 246  * low bits of the open(2) flags define access mode,
 247  * other bits are real flags.
 248  */
 249 static const char *
 250 sprint_open_modes(mode_t flags)
 251 {
 252         extern const struct xlat open_access_modes[];
 253         extern const struct xlat open_mode_flags[];
 254         static char outstr[1024];
 255         const char *str = xlookup(open_access_modes, flags & 3);
 256         const char *sep = "";
 257         const struct xlat *x;
 258
 259         strcpy(outstr, "flags ");
 260         if (str)
 261         {
 262                 strcat(outstr, str);
 263                 flags &= ~3;
 264                 if (!flags)
 265                         return outstr;
 266                 strcat(outstr, "|");
 267         }
 268
 269         for (x = open_mode_flags; x->str; x++)
 270         {
 271                 if ((flags & x->val) == x->val)
 272                 {
 273                         sprintf(outstr + strlen(outstr),
 274                                 "%s%s", sep, x->str);
 275                         sep = "|";
 276                         flags &= ~x->val;
 277                 }
 278         }
 279         if (flags)
 280                 sprintf(outstr + strlen(outstr), "%s%#x", sep, flags);
 281         return outstr;
 282 }
 283
 284 int
 285 sys_fcntl(struct tcb *tcp)
 286 {
 287         if (entering(tcp)) {
 288                 tprintf("%ld, ", tcp->u_arg[0]);
 289                 printxval(fcntlcmds, tcp->u_arg[1], "F_???");
 290                 switch (tcp->u_arg[1]) {
 291                 case F_SETFD:
 292                         tprintf(", ");
 293                         printflags(fdflags, tcp->u_arg[2], "FD_???");
 294                         break;
 295                 case F_SETOWN: case F_DUPFD:
 296                         tprintf(", %ld", tcp->u_arg[2]);
 297                         break;
 298                 case F_SETFL:
 299                         tprintf(", ");
 300                         tprint_open_modes(tcp, tcp->u_arg[2]);
 301                         break;
 302                 case F_SETLK: case F_SETLKW:
 303 #ifdef F_FREESP
 304                 case F_FREESP:
 305 #endif
 306                         tprintf(", ");
 307                         printflock(tcp, tcp->u_arg[2], 0);
 308                         break;
 309 #if _LFS64_LARGEFILE
 310 #ifdef F_FREESP64
 311                 case F_FREESP64:
 312 #endif
 313                 /* Linux glibc defines SETLK64 as SETLK,
 314                    even though the kernel has different values - as does Solaris. */
 315 #if defined(F_SETLK64) && F_SETLK64+0!=F_SETLK
 316                 case F_SETLK64:
 317 #endif
 318 #if defined(F_SETLKW64) && F_SETLKW64+0!=F_SETLKW
 319                 case F_SETLKW64:
 320 #endif
 321                         tprintf(", ");
 322                         printflock64(tcp, tcp->u_arg[2], 0);
 323                         break;
 324 #endif
 325                 }
 326         }
 327         else {
 328                 switch (tcp->u_arg[1]) {
 329                 case F_DUPFD:
 330                 case F_SETFD: case F_SETFL:
 331                 case F_SETLK: case F_SETLKW:
 332                 case F_SETOWN: case F_GETOWN:
 333                         break;
 334                 case F_GETFD:
 335                         if (tcp->u_rval == 0)
 336                                 return 0;
 337                         tcp->auxstr =
 338                                 sprintflags("flags ", fdflags, tcp->u_rval);
 339                         return RVAL_HEX|RVAL_STR;
 340                 case F_GETFL:
 341                         tcp->auxstr = sprint_open_modes(tcp->u_rval);
 342                         return RVAL_HEX|RVAL_STR;
 343                 case F_GETLK:
 344                         tprintf(", ");
 345                         printflock(tcp, tcp->u_arg[2], 1);
 346                         break;
 347 #if _LFS64_LARGEFILE
 348 #if defined(F_GETLK64) && F_GETLK64+0!=F_GETLK
 349                 case F_GETLK64:
 350 #endif
 351                         tprintf(", ");
 352                         printflock64(tcp, tcp->u_arg[2], 1);
 353                         break;
 354 #endif
 355                 default:
 356                         tprintf(", %#lx", tcp->u_arg[2]);
 357                         break;
 358                 }
 359         }
 360         return 0;
 361 }
 362
 363 #ifdef LOCK_SH
 364
 365 int
 366 sys_flock(tcp)
 367 struct tcb *tcp;
 368 {
 369         if (entering(tcp)) {
 370                 tprintf("%ld, ", tcp->u_arg[0]);
 371                 printflags(flockcmds, tcp->u_arg[1], "LOCK_???");
 372         }
 373         return 0;
 374 }
 375 #endif /* LOCK_SH */
 376
 377 int
 378 sys_close(tcp)
 379 struct tcb *tcp;
 380 {
 381         if (entering(tcp)) {
 382                 tprintf("%ld", tcp->u_arg[0]);
 383         }
 384         return 0;
 385 }
 386
 387 int
 388 sys_dup(tcp)
 389 struct tcb *tcp;
 390 {
 391         if (entering(tcp)) {
 392                 tprintf("%ld", tcp->u_arg[0]);
 393         }
 394         return 0;
 395 }
 396
 397 int
 398 sys_dup2(tcp)
 399 struct tcb *tcp;
 400 {
 401         if (entering(tcp)) {
 402                 tprintf("%ld, %ld", tcp->u_arg[0], tcp->u_arg[1]);
 403         }
 404         return 0;
 405 }
 406
 407 #if defined(ALPHA) || defined(FREEBSD) || defined(SUNOS4)
 408 int
 409 sys_getdtablesize(tcp)
 410 struct tcb *tcp;
 411 {
 412         return 0;
 413 }
 414 #endif /* ALPHA || FREEBSD || SUNOS4 */
 415
 416 static int
 417 decode_select(struct tcb *tcp, long *args, enum bitness_t bitness)
 418 {
 419         int i, j, nfds;
 420         unsigned int fdsize = ((((args[0] + 7) / 8) + sizeof(long) - 1)
 421                                & -sizeof(long));
 422         fd_set *fds;
 423         static char outstr[1024];
 424         char *sep;
 425         long arg;
 426
 427         if (entering(tcp)) {
 428                 fds = (fd_set *) malloc(fdsize);
 429                 if (fds == NULL)
 430                         fprintf(stderr, "out of memory\n");
 431                 nfds = args[0];
 432                 tprintf("%d", nfds);
 433                 for (i = 0; i < 3; i++) {
 434                         arg = args[i+1];
 435                         if (arg == 0) {
 436                                 tprintf(", NULL");
 437                                 continue;
 438                         }
 439                         if (fds == NULL || !verbose(tcp)) {
 440                                 tprintf(", %#lx", arg);
 441                                 continue;
 442                         }
 443                         if (umoven(tcp, arg, fdsize, (char *) fds) < 0) {
 444                                 tprintf(", [?]");
 445                                 continue;
 446                         }
 447                         tprintf(", [");
 448                         for (j = 0, sep = ""; j < nfds; j++) {
 449                                 if (FD_ISSET(j, fds)) {
 450                                         tprintf("%s%u", sep, j);
 451                                         sep = " ";
 452                                 }
 453                         }
 454                         tprintf("]");
 455                 }
 456                 free(fds);
 457                 tprintf(", ");
 458                 printtv_bitness(tcp, args[4], bitness, 0);
 459         }
 460         else
 461         {
 462                 unsigned int cumlen = 0;
 463                 char *sep = "";
 464
 465                 if (syserror(tcp))
 466                         return 0;
 467
 468                 if ((nfds = tcp->u_rval) == 0) {
 469                         tcp->auxstr = "Timeout";
 470                         return RVAL_STR;
 471                 }
 472
 473                 fds = (fd_set *) malloc(fdsize);
 474                 if (fds == NULL)
 475                         fprintf(stderr, "out of memory\n");
 476
 477                 outstr[0] = '\0';
 478                 for (i = 0; i < 3; i++) {
 479                         int first = 1;
 480                         char str[20];
 481
 482                         tcp->auxstr = outstr;
 483                         arg = args[i+1];
 484                         if (fds == NULL || !arg ||
 485                             umoven(tcp, arg, fdsize, (char *) fds) < 0)
 486                                 continue;
 487                         for (j = 0; j < args[0]; j++) {
 488                                 if (FD_ISSET(j, fds)) {
 489                                         if (first) {
 490                                                 sprintf(str, "%s%s [%u", sep,
 491                                                         i == 0 ? "in" :
 492                                                         i == 1 ? "out" :
 493                                                         "except", j);
 494                                                 first = 0;
 495                                                 sep = ", ";
 496                                         }
 497                                         else
 498                                                 sprintf(str, " %u", j);
 499                                         cumlen += strlen(str);
 500                                         if (cumlen < sizeof(outstr))
 501                                                 strcat(outstr, str);
 502                                         nfds--;
 503                                 }
 504                         }
 505                         if (cumlen)
 506                                 strcat(outstr, "]");
 507                         if (nfds == 0)
 508                                 break;
 509                 }
 510                 free(fds);
 511 #ifdef LINUX
 512                 /* This contains no useful information on SunOS.  */
 513                 if (args[4]) {
 514                         char str[128];
 515
 516                         sprintf(str, "%sleft ", sep);
 517                         sprinttv(tcp, args[4], bitness, str + strlen(str));
 518                         if ((cumlen += strlen(str)) < sizeof(outstr))
 519                                 strcat(outstr, str);
 520                 }
 521 #endif /* LINUX */
 522                 return RVAL_STR;
 523         }
 524         return 0;
 525 }
 526
 527 #ifdef LINUX
 528
 529 int
 530 sys_oldselect(tcp)
 531 struct tcb *tcp;
 532 {
 533         long args[5];
 534
 535         if (umoven(tcp, tcp->u_arg[0], sizeof args, (char *) args) < 0) {
 536                 tprintf("[...]");
 537                 return 0;
 538         }
 539         return decode_select(tcp, args, BITNESS_CURRENT);
 540 }
 541
 542 #ifdef ALPHA
 543 int
 544 sys_osf_select(tcp)
 545 struct tcb *tcp;
 546 {
 547         long *args = tcp->u_arg;
 548         return decode_select(tcp, args, BITNESS_32);
 549 }
 550 #endif
 551
 552 static struct xlat epollctls[] = {
 553 #ifdef EPOLL_CTL_ADD
 554         { EPOLL_CTL_ADD,        "EPOLL_CTL_ADD" },
 555 #endif
 556 #ifdef EPOLL_CTL_MOD
 557         { EPOLL_CTL_MOD,        "EPOLL_CTL_MOD" },
 558 #endif
 559 #ifdef EPOLL_CTL_DEL
 560         { EPOLL_CTL_DEL,        "EPOLL_CTL_DEL" },
 561 #endif
 562         { 0,                    NULL            }
 563 };
 564
 565 static struct xlat epollevents[] = {
 566 #ifdef EPOLLIN
 567         { EPOLLIN,      "EPOLLIN"       },
 568 #endif
 569 #ifdef EPOLLPRI
 570         { EPOLLPRI,     "EPOLLPRI"      },
 571 #endif
 572 #ifdef EPOLLOUT
 573         { EPOLLOUT,     "EPOLLOUT"      },
 574 #endif
 575 #ifdef EPOLLRDNORM
 576         { EPOLLRDNORM,  "EPOLLRDNORM"   },
 577 #endif
 578 #ifdef EPOLLRDBAND
 579         { EPOLLRDBAND,  "EPOLLRDBAND"   },
 580 #endif
 581 #ifdef EPOLLWRNORM
 582         { EPOLLWRNORM,  "EPOLLWRNORM"   },
 583 #endif
 584 #ifdef EPOLLWRBAND
 585         { EPOLLWRBAND,  "EPOLLWRBAND"   },
 586 #endif
 587 #ifdef EPOLLMSG
 588         { EPOLLMSG,     "EPOLLMSG"      },
 589 #endif
 590 #ifdef EPOLLERR
 591         { EPOLLERR,     "EPOLLERR"      },
 592 #endif
 593 #ifdef EPOLLHUP
 594         { EPOLLHUP,     "EPOLLHUP"      },
 595 #endif
 596 #ifdef EPOLLONESHOT
 597         { EPOLLONESHOT, "EPOLLONESHOT"  },
 598 #endif
 599 #ifdef EPOLLET
 600         { EPOLLET,      "EPOLLET"       },
 601 #endif
 602         { 0,            NULL            }
 603 };
 604
 605 int
 606 sys_epoll_create(tcp)
 607 struct tcb *tcp;
 608 {
 609         if (entering(tcp))
 610                 tprintf("%ld", tcp->u_arg[0]);
 611         return 0;
 612 }
 613
 614 #ifdef HAVE_SYS_EPOLL_H
 615 static void
 616 print_epoll_event(ev)
 617 struct epoll_event *ev;
 618 {
 619         tprintf("{");
 620         printflags(epollevents, ev->events, "EPOLL???");
 621         /* We cannot know what format the program uses, so print u32 and u64
 622            which will cover every value.  */
 623         tprintf(", {u32=%" PRIu32 ", u64=%" PRIu64 "}}",
 624                 ev->data.u32, ev->data.u64);
 625 }
 626 #endif
 627
 628 int
 629 sys_epoll_ctl(tcp)
 630 struct tcb *tcp;
 631 {
 632         if (entering(tcp)) {
 633                 tprintf("%ld, ", tcp->u_arg[0]);
 634                 printxval(epollctls, tcp->u_arg[1], "EPOLL_CTL_???");
 635                 tprintf(", %ld, ", tcp->u_arg[2]);
 636                 if (tcp->u_arg[3] == 0)
 637                         tprintf("NULL");
 638                 else {
 639 #ifdef HAVE_SYS_EPOLL_H
 640                         struct epoll_event ev;
 641                         if (umove(tcp, tcp->u_arg[3], &ev) == 0)
 642                                 print_epoll_event(&ev);
 643                         else
 644 #endif
 645                                 tprintf("{...}");
 646                 }
 647         }
 648         return 0;
 649 }
 650
 651 static void
 652 epoll_wait_common(tcp)
 653 struct tcb *tcp;
 654 {
 655         if (entering(tcp))
 656                 tprintf("%ld, ", tcp->u_arg[0]);
 657         else {
 658                 if (syserror(tcp))
 659                         tprintf("%lx", tcp->u_arg[1]);
 660                 else if (tcp->u_rval == 0)
 661                         tprintf("{}");
 662                 else {
 663 #ifdef HAVE_SYS_EPOLL_H
 664                         struct epoll_event ev, *start, *cur, *end;
 665                         int failed = 0;
 666
 667                         tprintf("{");
 668                         start = (struct epoll_event *) tcp->u_arg[1];
 669                         end = start + tcp->u_rval;
 670                         for (cur = start; cur < end; ++cur) {
 671                                 if (cur > start)
 672                                         tprintf(", ");
 673                                 if (umove(tcp, (long) cur, &ev) == 0)
 674                                         print_epoll_event(&ev);
 675                                 else {
 676                                         tprintf("?");
 677                                         failed = 1;
 678                                         break;
 679                                 }
 680                         }
 681                         tprintf("}");
 682                         if (failed)
 683                                 tprintf(" %#lx", (long) start);
 684 #else
 685                         tprintf("{...}");
 686 #endif
 687                 }
 688                 tprintf(", %ld, %ld", tcp->u_arg[2], tcp->u_arg[3]);
 689         }
 690 }
 691
 692 int
 693 sys_epoll_wait(tcp)
 694 struct tcb *tcp;
 695 {
 696         epoll_wait_common(tcp);
 697         return 0;
 698 }
 699
 700 int
 701 sys_epoll_pwait(tcp)
 702 struct tcb *tcp;
 703 {
 704         epoll_wait_common(tcp);
 705         if (exiting(tcp))
 706                 print_sigset(tcp, tcp->u_arg[4], 0);
 707         return 0;
 708 }
 709
 710 int
 711 sys_io_setup(tcp)
 712 struct tcb *tcp;
 713 {
 714         if (entering(tcp))
 715                 tprintf("%ld, ", tcp->u_arg[0]);
 716         else {
 717                 if (syserror(tcp))
 718                         tprintf("0x%0lx", tcp->u_arg[1]);
 719                 else {
 720                         unsigned long user_id;
 721                         if (umove(tcp, tcp->u_arg[1], &user_id) == 0)
 722                                 tprintf("{%lu}", user_id);
 723                         else
 724                                 tprintf("{...}");
 725                 }
 726         }
 727         return 0;
 728 }
 729
 730 int
 731 sys_io_destroy(tcp)
 732 struct tcb *tcp;
 733 {
 734         if (entering(tcp))
 735                 tprintf("%lu", tcp->u_arg[0]);
 736         return 0;
 737 }
 738
 739 int
 740 sys_io_submit(tcp)
 741 struct tcb *tcp;
 742 {
 743         long nr;
 744         if (entering(tcp)) {
 745                 tprintf("%lu, %ld, ", tcp->u_arg[0], tcp->u_arg[1]);
 746                 nr = tcp->u_arg[1];
 747                 /* and if nr is negative? */
 748                 if (nr == 0)
 749                         tprintf("{}");
 750                 else {
 751 #ifdef HAVE_LIBAIO_H
 752                         long i;
 753                         struct iocb *iocbp, **iocbs = (void *)tcp->u_arg[2];
 754
 755                         for (i = 0; i < nr; i++, iocbs++) {
 756                                 struct iocb iocb;
 757                                 if (i == 0)
 758                                         tprintf("{");
 759                                 else
 760                                         tprintf(", ");
 761
 762                                 if (umove(tcp, (unsigned long)iocbs, &iocbp) ||
 763                                     umove(tcp, (unsigned long)iocbp, &iocb)) {
 764                                         tprintf("{...}");
 765                                         continue;
 766                                 }
 767                                 tprintf("{%p, %u, %hu, %hu, %d}",
 768                                         iocb.data, iocb.key,
 769                                         iocb.aio_lio_opcode,
 770                                         iocb.aio_reqprio, iocb.aio_fildes);
 771                         }
 772                         if (i)
 773                                 tprintf("}");
 774 #else
 775                         tprintf("{...}");
 776 #endif
 777                 }
 778         }
 779         return 0;
 780 }
 781
 782 int
 783 sys_io_cancel(tcp)
 784 struct tcb *tcp;
 785 {
 786         if (entering(tcp)) {
 787 #ifdef HAVE_LIBAIO_H
 788                 struct iocb iocb;
 789 #endif
 790                 tprintf("%lu, ", tcp->u_arg[0]);
 791 #ifdef HAVE_LIBAIO_H
 792                 if (umove(tcp, tcp->u_arg[1], &iocb) == 0) {
 793                         tprintf("{%p, %u, %hu, %hu, %d}, ",
 794                                 iocb.data, iocb.key,
 795                                 iocb.aio_lio_opcode,
 796                                 iocb.aio_reqprio, iocb.aio_fildes);
 797                 } else
 798 #endif
 799                         tprintf("{...}, ");
 800         } else {
 801                 if (tcp->u_rval < 0)
 802                         tprintf("{...}");
 803                 else {
 804 #ifdef HAVE_LIBAIO_H
 805                         struct io_event event;
 806                         if (umove(tcp, tcp->u_arg[2], &event) == 0)
 807                                 tprintf("{%p, %p, %ld, %ld}",
 808                                         event.data, event.obj,
 809                                         event.res, event.res2);
 810                         else
 811 #endif
 812                                 tprintf("{...}");
 813                 }
 814         }
 815         return 0;
 816 }
 817
 818 int
 819 sys_io_getevents(struct tcb * tcp)
 820 {
 821         if (entering(tcp)) {
 822                 tprintf("%ld, %ld, %ld, ", tcp->u_arg[0], tcp->u_arg[1],
 823                         tcp->u_arg[2]);
 824         } else {
 825                 if (tcp->u_rval == 0) {
 826                         tprintf("{}");
 827                 } else  {
 828 #ifdef HAVE_LIBAIO_H
 829                         struct io_event *events = (void *)tcp->u_arg[3];
 830                         long i, nr = tcp->u_rval;
 831
 832                         for (i = 0; i < nr; i++, events++) {
 833                                 struct io_event event;
 834
 835                                 if (i == 0)
 836                                         tprintf("{");
 837                                 else
 838                                         tprintf(", ");
 839
 840                                 if (umove(tcp, (unsigned long)events, &event) != 0) {
 841                                         tprintf("{...}");
 842                                         continue;
 843                                 }
 844                                 tprintf("{%p, %p, %ld, %ld}", event.data,
 845                                         event.obj, event.res, event.res2);
 846                         }
 847                         tprintf("}, ");
 848 #else
 849                                 tprintf("{...}");
 850 #endif
 851                 }
 852
 853                 print_timespec(tcp, tcp->u_arg[4]);
 854         }
 855         return 0;
 856 }
 857 #endif /* LINUX */
 858
 859 int
 860 sys_select(tcp)
 861 struct tcb *tcp;
 862 {
 863         return decode_select(tcp, tcp->u_arg, BITNESS_CURRENT);
 864 }
 865
 866 #ifdef LINUX
 867 int
 868 sys_pselect6(struct tcb *tcp)
 869 {
 870         int rc = decode_select(tcp, tcp->u_arg, BITNESS_CURRENT);
 871         if (entering(tcp)) {
 872                 struct {
 873                         void *ss;
 874                         unsigned long len;
 875                 } data;
 876                 if (umove(tcp, tcp->u_arg[5], &data) < 0)
 877                         tprintf(", %#lx", tcp->u_arg[5]);
 878                 else {
 879                         tprintf(", {");
 880                         if (data.len < sizeof(long))
 881                                 tprintf("%#lx", (long)data.ss);
 882                         else
 883                                 print_sigset(tcp, (long)data.ss, 0);
 884                         tprintf(", %lu}", data.len);
 885                 }
 886         }
 887         return rc;
 888 }
 889
 890 int
 891 sys_eventfd(tcp)
 892 struct tcb *tcp;
 893 {
 894         if (entering(tcp))
 895                 tprintf("%lu", tcp->u_arg[0]);
 896         return 0;
 897 }
 898 #endif