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 #ifdef F_SETLEASE
 152         { F_SETLEASE,   "F_SETLEASE"    },
 153 #endif
 154 #ifdef F_GETLEASE
 155         { F_GETLEASE,   "F_GETLEASE"    },
 156 #endif
 157 #ifdef F_NOTIFY
 158         { F_NOTIFY,     "F_NOTIFY"      },
 159 #endif
 160 #ifdef F_DUPFD_CLOEXEC
 161         { F_DUPFD_CLOEXEC,"F_DUPFD_CLOEXEC"},
 162 #endif
 163         { 0,            NULL            },
 164 };
 165
 166 static const struct xlat fdflags[] = {
 167 #ifdef FD_CLOEXEC
 168         { FD_CLOEXEC,   "FD_CLOEXEC"    },
 169 #endif
 170         { 0,            NULL            },
 171 };
 172
 173 #ifdef LOCK_SH
 174
 175 static const struct xlat flockcmds[] = {
 176         { LOCK_SH,      "LOCK_SH"       },
 177         { LOCK_EX,      "LOCK_EX"       },
 178         { LOCK_NB,      "LOCK_NB"       },
 179         { LOCK_UN,      "LOCK_UN"       },
 180         { 0,            NULL            },
 181 };
 182
 183 #endif /* LOCK_SH */
 184
 185 static const struct xlat lockfcmds[] = {
 186         { F_RDLCK,      "F_RDLCK"       },
 187         { F_WRLCK,      "F_WRLCK"       },
 188         { F_UNLCK,      "F_UNLCK"       },
 189 #ifdef F_EXLCK
 190         { F_EXLCK,      "F_EXLCK"       },
 191 #endif
 192 #ifdef F_SHLCK
 193         { F_SHLCK,      "F_SHLCK"       },
 194 #endif
 195         { 0,            NULL            },
 196 };
 197
 198 #ifdef F_NOTIFY
 199 static const struct xlat notifyflags[] = {
 200 #ifdef DN_ACCESS
 201         { DN_ACCESS,    "DN_ACCESS"     },
 202 #endif
 203 #ifdef DN_MODIFY
 204         { DN_MODIFY,    "DN_MODIFY"     },
 205 #endif
 206 #ifdef DN_CREATE
 207         { DN_CREATE,    "DN_CREATE"     },
 208 #endif
 209 #ifdef DN_DELETE
 210         { DN_DELETE,    "DN_DELETE"     },
 211 #endif
 212 #ifdef DN_RENAME
 213         { DN_RENAME,    "DN_RENAME"     },
 214 #endif
 215 #ifdef DN_ATTRIB
 216         { DN_ATTRIB,    "DN_ATTRIB"     },
 217 #endif
 218 #ifdef DN_MULTISHOT
 219         { DN_MULTISHOT, "DN_MULTISHOT"  },
 220 #endif
 221         { 0,            NULL            },
 222 };
 223 #endif
 224
 225 static const struct xlat whence[] = {
 226         { SEEK_SET,     "SEEK_SET"      },
 227         { SEEK_CUR,     "SEEK_CUR"      },
 228         { SEEK_END,     "SEEK_END"      },
 229         { 0,            NULL            },
 230 };
 231
 232 #ifndef HAVE_LONG_LONG_OFF_T
 233 /* fcntl/lockf */
 234 static void
 235 printflock(struct tcb *tcp, long addr, int getlk)
 236 {
 237         struct flock fl;
 238
 239 #if SUPPORTED_PERSONALITIES > 1
 240         if (personality_wordsize[current_personality] != sizeof(fl.l_start)) {
 241                 if (personality_wordsize[current_personality] == 4) {
 242                         /* 32-bit x86 app on x86_64 and similar cases */
 243                         struct {
 244                                 short int l_type;
 245                                 short int l_whence;
 246                                 int32_t l_start; /* off_t */
 247                                 int32_t l_len; /* off_t */
 248                                 int32_t l_pid; /* pid_t */
 249                         } fl32;
 250                         if (umove(tcp, addr, &fl32) < 0) {
 251                                 tprintf("{...}");
 252                                 return;
 253                         }
 254                         fl.l_type = fl32.l_type;
 255                         fl.l_whence = fl32.l_whence;
 256                         fl.l_start = fl32.l_start;
 257                         fl.l_len = fl32.l_len;
 258                         fl.l_pid = fl32.l_pid;
 259                 } else {
 260                         /* let people know we have a problem here */
 261                         tprintf("{ <decode error: unsupported wordsize %d> }",
 262                                 personality_wordsize[current_personality]);
 263                         return;
 264                 }
 265         } else
 266 #endif
 267         {
 268                 if (umove(tcp, addr, &fl) < 0) {
 269                         tprintf("{...}");
 270                         return;
 271                 }
 272         }
 273         tprintf("{type=");
 274         printxval(lockfcmds, fl.l_type, "F_???");
 275         tprintf(", whence=");
 276         printxval(whence, fl.l_whence, "SEEK_???");
 277         tprintf(", start=%ld, len=%ld", fl.l_start, fl.l_len);
 278         if (getlk)
 279                 tprintf(", pid=%lu}", (unsigned long) fl.l_pid);
 280         else
 281                 tprintf("}");
 282 }
 283 #endif
 284
 285 #if _LFS64_LARGEFILE || HAVE_LONG_LONG_OFF_T
 286 /* fcntl/lockf */
 287 static void
 288 printflock64(struct tcb *tcp, long addr, int getlk)
 289 {
 290         struct flock64 fl;
 291
 292         if (umove(tcp, addr, &fl) < 0) {
 293                 tprintf("{...}");
 294                 return;
 295         }
 296         tprintf("{type=");
 297         printxval(lockfcmds, fl.l_type, "F_???");
 298         tprintf(", whence=");
 299         printxval(whence, fl.l_whence, "SEEK_???");
 300         tprintf(", start=%lld, len=%lld", (long long) fl.l_start, (long long) fl.l_len);
 301         if (getlk)
 302                 tprintf(", pid=%lu}", (unsigned long) fl.l_pid);
 303         else
 304                 tprintf("}");
 305 }
 306 #endif
 307
 308 int
 309 sys_fcntl(struct tcb *tcp)
 310 {
 311         if (entering(tcp)) {
 312                 printfd(tcp, tcp->u_arg[0]);
 313                 tprintf(", ");
 314                 printxval(fcntlcmds, tcp->u_arg[1], "F_???");
 315                 switch (tcp->u_arg[1]) {
 316                 case F_SETFD:
 317                         tprintf(", ");
 318                         printflags(fdflags, tcp->u_arg[2], "FD_???");
 319                         break;
 320                 case F_SETOWN: case F_DUPFD:
 321 #ifdef F_DUPFD_CLOEXEC
 322                 case F_DUPFD_CLOEXEC:
 323 #endif
 324                         tprintf(", %ld", tcp->u_arg[2]);
 325                         break;
 326                 case F_SETFL:
 327                         tprintf(", ");
 328                         tprint_open_modes(tcp->u_arg[2]);
 329                         break;
 330                 case F_SETLK: case F_SETLKW:
 331 #ifdef F_FREESP
 332                 case F_FREESP:
 333 #endif
 334                         tprintf(", ");
 335                         printflock(tcp, tcp->u_arg[2], 0);
 336                         break;
 337 #if _LFS64_LARGEFILE
 338 #ifdef F_FREESP64
 339                 case F_FREESP64:
 340 #endif
 341                 /* Linux glibc defines SETLK64 as SETLK,
 342                    even though the kernel has different values - as does Solaris. */
 343 #if defined(F_SETLK64) && F_SETLK64 + 0 != F_SETLK
 344                 case F_SETLK64:
 345 #endif
 346 #if defined(F_SETLKW64) && F_SETLKW64 + 0 != F_SETLKW
 347                 case F_SETLKW64:
 348 #endif
 349                         tprintf(", ");
 350                         printflock64(tcp, tcp->u_arg[2], 0);
 351                         break;
 352 #endif
 353 #ifdef F_NOTIFY
 354                 case F_NOTIFY:
 355                         tprintf(", ");
 356                         printflags(notifyflags, tcp->u_arg[2], "DN_???");
 357                         break;
 358 #endif
 359 #ifdef F_SETLEASE
 360                 case F_SETLEASE:
 361                         tprintf(", ");
 362                         printxval(lockfcmds, tcp->u_arg[2], "F_???");
 363                         break;
 364 #endif
 365                 }
 366         }
 367         else {
 368                 switch (tcp->u_arg[1]) {
 369                 case F_DUPFD:
 370 #ifdef F_DUPFD_CLOEXEC
 371                 case F_DUPFD_CLOEXEC:
 372 #endif
 373                 case F_SETFD: case F_SETFL:
 374                 case F_SETLK: case F_SETLKW:
 375                 case F_SETOWN: case F_GETOWN:
 376 #ifdef F_NOTIFY
 377                 case F_NOTIFY:
 378 #endif
 379 #ifdef F_SETLEASE
 380                 case F_SETLEASE:
 381 #endif
 382                         break;
 383                 case F_GETFD:
 384                         if (syserror(tcp) || tcp->u_rval == 0)
 385                                 return 0;
 386                         tcp->auxstr = sprintflags("flags ", fdflags, tcp->u_rval);
 387                         return RVAL_HEX|RVAL_STR;
 388                 case F_GETFL:
 389                         if (syserror(tcp))
 390                                 return 0;
 391                         tcp->auxstr = sprint_open_modes(tcp->u_rval);
 392                         return RVAL_HEX|RVAL_STR;
 393                 case F_GETLK:
 394                         tprintf(", ");
 395                         printflock(tcp, tcp->u_arg[2], 1);
 396                         break;
 397 #if _LFS64_LARGEFILE
 398 #if defined(F_GETLK64) && F_GETLK64+0 != F_GETLK
 399                 case F_GETLK64:
 400 #endif
 401                         tprintf(", ");
 402                         printflock64(tcp, tcp->u_arg[2], 1);
 403                         break;
 404 #endif
 405 #ifdef F_GETLEASE
 406                 case F_GETLEASE:
 407                         if (syserror(tcp))
 408                                 return 0;
 409                         tcp->auxstr = xlookup(lockfcmds, tcp->u_rval);
 410                         return RVAL_HEX|RVAL_STR;
 411 #endif
 412                 default:
 413                         tprintf(", %#lx", tcp->u_arg[2]);
 414                         break;
 415                 }
 416         }
 417         return 0;
 418 }
 419
 420 #ifdef LOCK_SH
 421
 422 int
 423 sys_flock(struct tcb *tcp)
 424 {
 425         if (entering(tcp)) {
 426                 printfd(tcp, tcp->u_arg[0]);
 427                 tprintf(", ");
 428                 printflags(flockcmds, tcp->u_arg[1], "LOCK_???");
 429         }
 430         return 0;
 431 }
 432 #endif /* LOCK_SH */
 433
 434 int
 435 sys_close(struct tcb *tcp)
 436 {
 437         if (entering(tcp)) {
 438                 printfd(tcp, tcp->u_arg[0]);
 439         }
 440         return 0;
 441 }
 442
 443 int
 444 sys_dup(struct tcb *tcp)
 445 {
 446         if (entering(tcp)) {
 447                 printfd(tcp, tcp->u_arg[0]);
 448         }
 449         return 0;
 450 }
 451
 452 static int
 453 do_dup2(struct tcb *tcp, int flags_arg)
 454 {
 455         if (entering(tcp)) {
 456                 printfd(tcp, tcp->u_arg[0]);
 457                 tprintf(", ");
 458                 printfd(tcp, tcp->u_arg[1]);
 459                 if (flags_arg >= 0) {
 460                         tprintf(", ");
 461                         printflags(open_mode_flags, tcp->u_arg[flags_arg], "O_???");
 462                 }
 463         }
 464         return 0;
 465 }
 466
 467 int
 468 sys_dup2(struct tcb *tcp)
 469 {
 470         return do_dup2(tcp, -1);
 471 }
 472
 473 #ifdef LINUX
 474 int
 475 sys_dup3(struct tcb *tcp)
 476 {
 477         return do_dup2(tcp, 2);
 478 }
 479 #endif
 480
 481 #if defined(ALPHA) || defined(FREEBSD) || defined(SUNOS4)
 482 int
 483 sys_getdtablesize(struct tcb *tcp)
 484 {
 485         return 0;
 486 }
 487 #endif /* ALPHA || FREEBSD || SUNOS4 */
 488
 489 static int
 490 decode_select(struct tcb *tcp, long *args, enum bitness_t bitness)
 491 {
 492         int i, j, nfds;
 493         unsigned int fdsize = ((((args[0] + 7) / 8) + sizeof(long) - 1)
 494                                & -sizeof(long));
 495         fd_set *fds;
 496         static char outstr[1024];
 497         const char *sep;
 498         long arg;
 499
 500         if (entering(tcp)) {
 501                 fds = (fd_set *) malloc(fdsize);
 502                 if (fds == NULL)
 503                         fprintf(stderr, "out of memory\n");
 504                 nfds = args[0];
 505                 tprintf("%d", nfds);
 506                 for (i = 0; i < 3; i++) {
 507                         arg = args[i+1];
 508                         if (arg == 0) {
 509                                 tprintf(", NULL");
 510                                 continue;
 511                         }
 512                         if (fds == NULL || !verbose(tcp)) {
 513                                 tprintf(", %#lx", arg);
 514                                 continue;
 515                         }
 516                         if (umoven(tcp, arg, fdsize, (char *) fds) < 0) {
 517                                 tprintf(", [?]");
 518                                 continue;
 519                         }
 520                         tprintf(", [");
 521                         for (j = 0, sep = ""; j < nfds; j++) {
 522                                 if (FD_ISSET(j, fds)) {
 523                                         tprintf("%s", sep);
 524                                         printfd(tcp, j);
 525                                         sep = " ";
 526                                 }
 527                         }
 528                         tprintf("]");
 529                 }
 530                 free(fds);
 531                 tprintf(", ");
 532                 printtv_bitness(tcp, args[4], bitness, 0);
 533         }
 534         else
 535         {
 536                 unsigned int cumlen = 0;
 537                 const char *sep = "";
 538
 539                 if (syserror(tcp))
 540                         return 0;
 541
 542                 if ((nfds = tcp->u_rval) == 0) {
 543                         tcp->auxstr = "Timeout";
 544                         return RVAL_STR;
 545                 }
 546
 547                 fds = (fd_set *) malloc(fdsize);
 548                 if (fds == NULL)
 549                         fprintf(stderr, "out of memory\n");
 550
 551                 outstr[0] = '\0';
 552                 for (i = 0; i < 3; i++) {
 553                         int first = 1;
 554
 555                         tcp->auxstr = outstr;
 556                         arg = args[i+1];
 557                         if (fds == NULL || !arg ||
 558                             umoven(tcp, arg, fdsize, (char *) fds) < 0)
 559                                 continue;
 560                         for (j = 0; j < args[0]; j++) {
 561                                 if (FD_ISSET(j, fds)) {
 562                                         char str[11 + 3 * sizeof(int)];
 563
 564                                         if (first) {
 565                                                 sprintf(str, "%s%s [%u", sep,
 566                                                         i == 0 ? "in" :
 567                                                         i == 1 ? "out" :
 568                                                         "except", j);
 569                                                 first = 0;
 570                                                 sep = ", ";
 571                                         }
 572                                         else
 573                                                 sprintf(str, " %u", j);
 574                                         cumlen += strlen(str);
 575                                         if (cumlen < sizeof(outstr))
 576                                                 strcat(outstr, str);
 577                                         nfds--;
 578                                 }
 579                         }
 580                         if (cumlen)
 581                                 strcat(outstr, "]");
 582                         if (nfds == 0)
 583                                 break;
 584                 }
 585                 free(fds);
 586 #ifdef LINUX
 587                 /* This contains no useful information on SunOS.  */
 588                 if (args[4]) {
 589                         char str[128];
 590
 591                         sprintf(str, "%sleft ", sep);
 592                         sprinttv(tcp, args[4], bitness, str + strlen(str));
 593                         if ((cumlen += strlen(str)) < sizeof(outstr))
 594                                 strcat(outstr, str);
 595                 }
 596 #endif /* LINUX */
 597                 return RVAL_STR;
 598         }
 599         return 0;
 600 }
 601
 602 #ifdef LINUX
 603
 604 int
 605 sys_oldselect(struct tcb *tcp)
 606 {
 607         long args[5];
 608
 609         if (umoven(tcp, tcp->u_arg[0], sizeof args, (char *) args) < 0) {
 610                 tprintf("[...]");
 611                 return 0;
 612         }
 613         return decode_select(tcp, args, BITNESS_CURRENT);
 614 }
 615
 616 #ifdef ALPHA
 617 int
 618 sys_osf_select(struct tcb *tcp)
 619 {
 620         long *args = tcp->u_arg;
 621         return decode_select(tcp, args, BITNESS_32);
 622 }
 623 #endif
 624
 625 static const struct xlat epollctls[] = {
 626 #ifdef EPOLL_CTL_ADD
 627         { EPOLL_CTL_ADD,        "EPOLL_CTL_ADD" },
 628 #endif
 629 #ifdef EPOLL_CTL_MOD
 630         { EPOLL_CTL_MOD,        "EPOLL_CTL_MOD" },
 631 #endif
 632 #ifdef EPOLL_CTL_DEL
 633         { EPOLL_CTL_DEL,        "EPOLL_CTL_DEL" },
 634 #endif
 635         { 0,                    NULL            }
 636 };
 637
 638 static const struct xlat epollevents[] = {
 639 #ifdef EPOLLIN
 640         { EPOLLIN,      "EPOLLIN"       },
 641 #endif
 642 #ifdef EPOLLPRI
 643         { EPOLLPRI,     "EPOLLPRI"      },
 644 #endif
 645 #ifdef EPOLLOUT
 646         { EPOLLOUT,     "EPOLLOUT"      },
 647 #endif
 648 #ifdef EPOLLRDNORM
 649         { EPOLLRDNORM,  "EPOLLRDNORM"   },
 650 #endif
 651 #ifdef EPOLLRDBAND
 652         { EPOLLRDBAND,  "EPOLLRDBAND"   },
 653 #endif
 654 #ifdef EPOLLWRNORM
 655         { EPOLLWRNORM,  "EPOLLWRNORM"   },
 656 #endif
 657 #ifdef EPOLLWRBAND
 658         { EPOLLWRBAND,  "EPOLLWRBAND"   },
 659 #endif
 660 #ifdef EPOLLMSG
 661         { EPOLLMSG,     "EPOLLMSG"      },
 662 #endif
 663 #ifdef EPOLLERR
 664         { EPOLLERR,     "EPOLLERR"      },
 665 #endif
 666 #ifdef EPOLLHUP
 667         { EPOLLHUP,     "EPOLLHUP"      },
 668 #endif
 669 #ifdef EPOLLONESHOT
 670         { EPOLLONESHOT, "EPOLLONESHOT"  },
 671 #endif
 672 #ifdef EPOLLET
 673         { EPOLLET,      "EPOLLET"       },
 674 #endif
 675         { 0,            NULL            }
 676 };
 677
 678 int
 679 sys_epoll_create(struct tcb *tcp)
 680 {
 681         if (entering(tcp))
 682                 tprintf("%ld", tcp->u_arg[0]);
 683         return 0;
 684 }
 685
 686 int
 687 sys_epoll_create1(struct tcb *tcp)
 688 {
 689         if (entering(tcp))
 690                 printflags(open_mode_flags, tcp->u_arg[0], "O_???");
 691         return 0;
 692 }
 693
 694 #ifdef HAVE_SYS_EPOLL_H
 695 static void
 696 print_epoll_event(struct epoll_event *ev)
 697 {
 698         tprintf("{");
 699         printflags(epollevents, ev->events, "EPOLL???");
 700         /* We cannot know what format the program uses, so print u32 and u64
 701            which will cover every value.  */
 702         tprintf(", {u32=%" PRIu32 ", u64=%" PRIu64 "}}",
 703                 ev->data.u32, ev->data.u64);
 704 }
 705 #endif
 706
 707 int
 708 sys_epoll_ctl(struct tcb *tcp)
 709 {
 710         if (entering(tcp)) {
 711                 printfd(tcp, tcp->u_arg[0]);
 712                 tprintf(", ");
 713                 printxval(epollctls, tcp->u_arg[1], "EPOLL_CTL_???");
 714                 tprintf(", ");
 715                 printfd(tcp, tcp->u_arg[2]);
 716                 tprintf(", ");
 717                 if (tcp->u_arg[3] == 0)
 718                         tprintf("NULL");
 719                 else {
 720 #ifdef HAVE_SYS_EPOLL_H
 721                         struct epoll_event ev;
 722                         if (umove(tcp, tcp->u_arg[3], &ev) == 0)
 723                                 print_epoll_event(&ev);
 724                         else
 725 #endif
 726                                 tprintf("{...}");
 727                 }
 728         }
 729         return 0;
 730 }
 731
 732 static void
 733 epoll_wait_common(struct tcb *tcp)
 734 {
 735         if (entering(tcp)) {
 736                 printfd(tcp, tcp->u_arg[0]);
 737                 tprintf(", ");
 738         } else {
 739                 if (syserror(tcp))
 740                         tprintf("%lx", tcp->u_arg[1]);
 741                 else if (tcp->u_rval == 0)
 742                         tprintf("{}");
 743                 else {
 744 #ifdef HAVE_SYS_EPOLL_H
 745                         struct epoll_event ev, *start, *cur, *end;
 746                         int failed = 0;
 747
 748                         tprintf("{");
 749                         start = (struct epoll_event *) tcp->u_arg[1];
 750                         end = start + tcp->u_rval;
 751                         for (cur = start; cur < end; ++cur) {
 752                                 if (cur > start)
 753                                         tprintf(", ");
 754                                 if (umove(tcp, (long) cur, &ev) == 0)
 755                                         print_epoll_event(&ev);
 756                                 else {
 757                                         tprintf("?");
 758                                         failed = 1;
 759                                         break;
 760                                 }
 761                         }
 762                         tprintf("}");
 763                         if (failed)
 764                                 tprintf(" %#lx", (long) start);
 765 #else
 766                         tprintf("{...}");
 767 #endif
 768                 }
 769                 tprintf(", %ld, %ld", tcp->u_arg[2], tcp->u_arg[3]);
 770         }
 771 }
 772
 773 int
 774 sys_epoll_wait(struct tcb *tcp)
 775 {
 776         epoll_wait_common(tcp);
 777         return 0;
 778 }
 779
 780 int
 781 sys_epoll_pwait(struct tcb *tcp)
 782 {
 783         epoll_wait_common(tcp);
 784         if (exiting(tcp)) {
 785                 tprintf(", ");
 786                 print_sigset(tcp, tcp->u_arg[4], 0);
 787         }
 788         return 0;
 789 }
 790
 791 int
 792 sys_io_setup(struct tcb *tcp)
 793 {
 794         if (entering(tcp))
 795                 tprintf("%ld, ", tcp->u_arg[0]);
 796         else {
 797                 if (syserror(tcp))
 798                         tprintf("0x%0lx", tcp->u_arg[1]);
 799                 else {
 800                         unsigned long user_id;
 801                         if (umove(tcp, tcp->u_arg[1], &user_id) == 0)
 802                                 tprintf("{%lu}", user_id);
 803                         else
 804                                 tprintf("{...}");
 805                 }
 806         }
 807         return 0;
 808 }
 809
 810 int
 811 sys_io_destroy(struct tcb *tcp)
 812 {
 813         if (entering(tcp))
 814                 tprintf("%lu", tcp->u_arg[0]);
 815         return 0;
 816 }
 817
 818 int
 819 sys_io_submit(struct tcb *tcp)
 820 {
 821         long nr;
 822         if (entering(tcp)) {
 823                 tprintf("%lu, %ld, ", tcp->u_arg[0], tcp->u_arg[1]);
 824                 nr = tcp->u_arg[1];
 825                 /* and if nr is negative? */
 826                 if (nr == 0)
 827                         tprintf("{}");
 828                 else {
 829 #ifdef HAVE_LIBAIO_H
 830                         long i;
 831                         struct iocb *iocbp, **iocbs = (void *)tcp->u_arg[2];
 832
 833                         for (i = 0; i < nr; i++, iocbs++) {
 834                                 struct iocb iocb;
 835                                 if (i == 0)
 836                                         tprintf("{");
 837                                 else
 838                                         tprintf(", ");
 839
 840                                 if (umove(tcp, (unsigned long)iocbs, &iocbp) ||
 841                                     umove(tcp, (unsigned long)iocbp, &iocb)) {
 842                                         tprintf("{...}");
 843                                         continue;
 844                                 }
 845                                 tprintf("{%p, %u, %hu, %hu, %d}",
 846                                         iocb.data, iocb.key,
 847                                         iocb.aio_lio_opcode,
 848                                         iocb.aio_reqprio, iocb.aio_fildes);
 849                         }
 850                         if (i)
 851                                 tprintf("}");
 852 #else
 853                         tprintf("{...}");
 854 #endif
 855                 }
 856         }
 857         return 0;
 858 }
 859
 860 int
 861 sys_io_cancel(struct tcb *tcp)
 862 {
 863         if (entering(tcp)) {
 864 #ifdef HAVE_LIBAIO_H
 865                 struct iocb iocb;
 866 #endif
 867                 tprintf("%lu, ", tcp->u_arg[0]);
 868 #ifdef HAVE_LIBAIO_H
 869                 if (umove(tcp, tcp->u_arg[1], &iocb) == 0) {
 870                         tprintf("{%p, %u, %hu, %hu, %d}, ",
 871                                 iocb.data, iocb.key,
 872                                 iocb.aio_lio_opcode,
 873                                 iocb.aio_reqprio, iocb.aio_fildes);
 874                 } else
 875 #endif
 876                         tprintf("{...}, ");
 877         } else {
 878                 if (tcp->u_rval < 0)
 879                         tprintf("{...}");
 880                 else {
 881 #ifdef HAVE_LIBAIO_H
 882                         struct io_event event;
 883                         if (umove(tcp, tcp->u_arg[2], &event) == 0)
 884                                 tprintf("{%p, %p, %ld, %ld}",
 885                                         event.data, event.obj,
 886                                         event.res, event.res2);
 887                         else
 888 #endif
 889                                 tprintf("{...}");
 890                 }
 891         }
 892         return 0;
 893 }
 894
 895 int
 896 sys_io_getevents(struct tcb *tcp)
 897 {
 898         if (entering(tcp)) {
 899                 tprintf("%ld, %ld, %ld, ", tcp->u_arg[0], tcp->u_arg[1],
 900                         tcp->u_arg[2]);
 901         } else {
 902                 if (tcp->u_rval == 0) {
 903                         tprintf("{}");
 904                 } else  {
 905 #ifdef HAVE_LIBAIO_H
 906                         struct io_event *events = (void *)tcp->u_arg[3];
 907                         long i, nr = tcp->u_rval;
 908
 909                         for (i = 0; i < nr; i++, events++) {
 910                                 struct io_event event;
 911
 912                                 if (i == 0)
 913                                         tprintf("{");
 914                                 else
 915                                         tprintf(", ");
 916
 917                                 if (umove(tcp, (unsigned long)events, &event) != 0) {
 918                                         tprintf("{...}");
 919                                         continue;
 920                                 }
 921                                 tprintf("{%p, %p, %ld, %ld}", event.data,
 922                                         event.obj, event.res, event.res2);
 923                         }
 924                         tprintf("}, ");
 925 #else
 926                                 tprintf("{...}");
 927 #endif
 928                 }
 929
 930                 print_timespec(tcp, tcp->u_arg[4]);
 931         }
 932         return 0;
 933 }
 934 #endif /* LINUX */
 935
 936 int
 937 sys_select(struct tcb *tcp)
 938 {
 939         return decode_select(tcp, tcp->u_arg, BITNESS_CURRENT);
 940 }
 941
 942 #ifdef LINUX
 943 int
 944 sys_pselect6(struct tcb *tcp)
 945 {
 946         int rc = decode_select(tcp, tcp->u_arg, BITNESS_CURRENT);
 947         if (entering(tcp)) {
 948                 struct {
 949                         void *ss;
 950                         unsigned long len;
 951                 } data;
 952                 if (umove(tcp, tcp->u_arg[5], &data) < 0)
 953                         tprintf(", %#lx", tcp->u_arg[5]);
 954                 else {
 955                         tprintf(", {");
 956                         if (data.len < sizeof(long))
 957                                 tprintf("%#lx", (long)data.ss);
 958                         else
 959                                 print_sigset(tcp, (long)data.ss, 0);
 960                         tprintf(", %lu}", data.len);
 961                 }
 962         }
 963         return rc;
 964 }
 965
 966 static int
 967 do_eventfd(struct tcb *tcp, int flags_arg)
 968 {
 969         if (entering(tcp)) {
 970                 tprintf("%lu", tcp->u_arg[0]);
 971                 if (flags_arg >= 0) {
 972                         tprintf(", ");
 973                         printflags(open_mode_flags, tcp->u_arg[flags_arg], "O_???");
 974                 }
 975         }
 976         return 0;
 977 }
 978
 979 int
 980 sys_eventfd(struct tcb *tcp)
 981 {
 982         return do_eventfd(tcp, -1);
 983 }
 984
 985 int
 986 sys_eventfd2(struct tcb *tcp)
 987 {
 988         return do_eventfd(tcp, 1);
 989 }
 990 #endif