granicus.if.org Git - strace/blob - io.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 #if HAVE_SYS_UIO_H
  37 #include <sys/uio.h>
  38 #endif
  39
  40 #ifdef HAVE_LONG_LONG_OFF_T
  41 /*
  42  * Hacks for systems that have a long long off_t
  43  */
  44
  45 #define sys_pread64     sys_pread
  46 #define sys_pwrite64    sys_pwrite
  47 #endif
  48
  49 int
  50 sys_read(struct tcb *tcp)
  51 {
  52         if (entering(tcp)) {
  53                 printfd(tcp, tcp->u_arg[0]);
  54                 tprints(", ");
  55         } else {
  56                 if (syserror(tcp))
  57                         tprintf("%#lx", tcp->u_arg[1]);
  58                 else
  59                         printstr(tcp, tcp->u_arg[1], tcp->u_rval);
  60                 tprintf(", %lu", tcp->u_arg[2]);
  61         }
  62         return 0;
  63 }
  64
  65 int
  66 sys_write(struct tcb *tcp)
  67 {
  68         if (entering(tcp)) {
  69                 printfd(tcp, tcp->u_arg[0]);
  70                 tprints(", ");
  71                 printstr(tcp, tcp->u_arg[1], tcp->u_arg[2]);
  72                 tprintf(", %lu", tcp->u_arg[2]);
  73         }
  74         return 0;
  75 }
  76
  77 #if HAVE_SYS_UIO_H
  78 void
  79 tprint_iov(struct tcb *tcp, unsigned long len, unsigned long addr, int decode_iov)
  80 {
  81 #if defined(LINUX) && SUPPORTED_PERSONALITIES > 1
  82         union {
  83                 struct { u_int32_t base; u_int32_t len; } iov32;
  84                 struct { u_int64_t base; u_int64_t len; } iov64;
  85         } iov;
  86 #define sizeof_iov \
  87   (personality_wordsize[current_personality] == 4 \
  88    ? sizeof(iov.iov32) : sizeof(iov.iov64))
  89 #define iov_iov_base \
  90   (personality_wordsize[current_personality] == 4 \
  91    ? (u_int64_t) iov.iov32.base : iov.iov64.base)
  92 #define iov_iov_len \
  93   (personality_wordsize[current_personality] == 4 \
  94    ? (u_int64_t) iov.iov32.len : iov.iov64.len)
  95 #else
  96         struct iovec iov;
  97 #define sizeof_iov sizeof(iov)
  98 #define iov_iov_base iov.iov_base
  99 #define iov_iov_len iov.iov_len
 100 #endif
 101         unsigned long size, cur, end, abbrev_end;
 102         int failed = 0;
 103
 104         if (!len) {
 105                 tprints("[]");
 106                 return;
 107         }
 108         size = len * sizeof_iov;
 109         end = addr + size;
 110         if (!verbose(tcp) || size / sizeof_iov != len || end < addr) {
 111                 tprintf("%#lx", addr);
 112                 return;
 113         }
 114         if (abbrev(tcp)) {
 115                 abbrev_end = addr + max_strlen * sizeof_iov;
 116                 if (abbrev_end < addr)
 117                         abbrev_end = end;
 118         } else {
 119                 abbrev_end = end;
 120         }
 121         tprints("[");
 122         for (cur = addr; cur < end; cur += sizeof_iov) {
 123                 if (cur > addr)
 124                         tprints(", ");
 125                 if (cur >= abbrev_end) {
 126                         tprints("...");
 127                         break;
 128                 }
 129                 if (umoven(tcp, cur, sizeof_iov, (char *) &iov) < 0) {
 130                         tprints("?");
 131                         failed = 1;
 132                         break;
 133                 }
 134                 tprints("{");
 135                 if (decode_iov)
 136                         printstr(tcp, (long) iov_iov_base, iov_iov_len);
 137                 else
 138                         tprintf("%#lx", (long) iov_iov_base);
 139                 tprintf(", %lu}", (unsigned long)iov_iov_len);
 140         }
 141         tprints("]");
 142         if (failed)
 143                 tprintf(" %#lx", addr);
 144 #undef sizeof_iov
 145 #undef iov_iov_base
 146 #undef iov_iov_len
 147 }
 148
 149 int
 150 sys_readv(struct tcb *tcp)
 151 {
 152         if (entering(tcp)) {
 153                 printfd(tcp, tcp->u_arg[0]);
 154                 tprints(", ");
 155         } else {
 156                 if (syserror(tcp)) {
 157                         tprintf("%#lx, %lu",
 158                                         tcp->u_arg[1], tcp->u_arg[2]);
 159                         return 0;
 160                 }
 161                 tprint_iov(tcp, tcp->u_arg[2], tcp->u_arg[1], 1);
 162                 tprintf(", %lu", tcp->u_arg[2]);
 163         }
 164         return 0;
 165 }
 166
 167 int
 168 sys_writev(struct tcb *tcp)
 169 {
 170         if (entering(tcp)) {
 171                 printfd(tcp, tcp->u_arg[0]);
 172                 tprints(", ");
 173                 tprint_iov(tcp, tcp->u_arg[2], tcp->u_arg[1], 1);
 174                 tprintf(", %lu", tcp->u_arg[2]);
 175         }
 176         return 0;
 177 }
 178 #endif
 179
 180 #if defined(SVR4)
 181
 182 int
 183 sys_pread(struct tcb *tcp)
 184 {
 185         if (entering(tcp)) {
 186                 printfd(tcp, tcp->u_arg[0]);
 187                 tprints(", ");
 188         } else {
 189                 if (syserror(tcp))
 190                         tprintf("%#lx", tcp->u_arg[1]);
 191                 else
 192                         printstr(tcp, tcp->u_arg[1], tcp->u_rval);
 193 #if UNIXWARE
 194                 /* off_t is signed int */
 195                 tprintf(", %lu, %ld", tcp->u_arg[2], tcp->u_arg[3]);
 196 #else
 197                 tprintf(", %lu, %llu", tcp->u_arg[2],
 198                         LONG_LONG(tcp->u_arg[3], tcp->u_arg[4]));
 199 #endif
 200         }
 201         return 0;
 202 }
 203
 204 int
 205 sys_pwrite(struct tcb *tcp)
 206 {
 207         if (entering(tcp)) {
 208                 printfd(tcp, tcp->u_arg[0]);
 209                 tprints(", ");
 210                 printstr(tcp, tcp->u_arg[1], tcp->u_arg[2]);
 211 #if UNIXWARE
 212                 /* off_t is signed int */
 213                 tprintf(", %lu, %ld", tcp->u_arg[2], tcp->u_arg[3]);
 214 #else
 215                 tprintf(", %lu, %llu", tcp->u_arg[2],
 216                         LONG_LONG(tcp->u_arg[3], tcp->u_arg[4]));
 217 #endif
 218         }
 219         return 0;
 220 }
 221 #endif /* SVR4 */
 222
 223 #ifdef FREEBSD
 224 #include <sys/types.h>
 225 #include <sys/socket.h>
 226
 227 int
 228 sys_sendfile(struct tcb *tcp)
 229 {
 230         if (entering(tcp)) {
 231                 printfd(tcp, tcp->u_arg[0]);
 232                 tprints(", ");
 233                 printfd(tcp, tcp->u_arg[1]);
 234                 tprintf(", %llu, %lu",
 235                         LONG_LONG(tcp->u_arg[2], tcp->u_arg[3]),
 236                         tcp->u_arg[4]);
 237         } else {
 238                 off_t offset;
 239
 240                 if (!tcp->u_arg[5])
 241                         tprints(", NULL");
 242                 else {
 243                         struct sf_hdtr hdtr;
 244
 245                         if (umove(tcp, tcp->u_arg[5], &hdtr) < 0)
 246                                 tprintf(", %#lx", tcp->u_arg[5]);
 247                         else {
 248                                 tprints(", { ");
 249                                 tprint_iov(tcp, hdtr.hdr_cnt, hdtr.headers, 1);
 250                                 tprintf(", %u, ", hdtr.hdr_cnt);
 251                                 tprint_iov(tcp, hdtr.trl_cnt, hdtr.trailers, 1);
 252                                 tprintf(", %u }", hdtr.hdr_cnt);
 253                         }
 254                 }
 255                 if (!tcp->u_arg[6])
 256                         tprints(", NULL");
 257                 else if (umove(tcp, tcp->u_arg[6], &offset) < 0)
 258                         tprintf(", %#lx", tcp->u_arg[6]);
 259                 else
 260                         tprintf(", [%llu]", offset);
 261                 tprintf(", %lu", tcp->u_arg[7]);
 262         }
 263         return 0;
 264 }
 265 #endif /* FREEBSD */
 266
 267 #ifdef LINUX
 268
 269 /* The SH4 ABI does allow long longs in odd-numbered registers, but
 270    does not allow them to be split between registers and memory - and
 271    there are only four argument registers for normal functions.  As a
 272    result pread takes an extra padding argument before the offset.  This
 273    was changed late in the 2.4 series (around 2.4.20).  */
 274 #if defined(SH)
 275 #define PREAD_OFFSET_ARG 4
 276 #else
 277 #define PREAD_OFFSET_ARG 3
 278 #endif
 279
 280 int
 281 sys_pread(struct tcb *tcp)
 282 {
 283         if (entering(tcp)) {
 284                 printfd(tcp, tcp->u_arg[0]);
 285                 tprints(", ");
 286         } else {
 287                 if (syserror(tcp))
 288                         tprintf("%#lx", tcp->u_arg[1]);
 289                 else
 290                         printstr(tcp, tcp->u_arg[1], tcp->u_rval);
 291                 tprintf(", %lu, ", tcp->u_arg[2]);
 292                 printllval(tcp, "%llu", PREAD_OFFSET_ARG);
 293         }
 294         return 0;
 295 }
 296
 297 int
 298 sys_pwrite(struct tcb *tcp)
 299 {
 300         if (entering(tcp)) {
 301                 printfd(tcp, tcp->u_arg[0]);
 302                 tprints(", ");
 303                 printstr(tcp, tcp->u_arg[1], tcp->u_arg[2]);
 304                 tprintf(", %lu, ", tcp->u_arg[2]);
 305                 printllval(tcp, "%llu", PREAD_OFFSET_ARG);
 306         }
 307         return 0;
 308 }
 309
 310 #if HAVE_SYS_UIO_H
 311 int
 312 sys_preadv(struct tcb *tcp)
 313 {
 314         if (entering(tcp)) {
 315                 printfd(tcp, tcp->u_arg[0]);
 316                 tprints(", ");
 317         } else {
 318                 if (syserror(tcp)) {
 319                         tprintf("%#lx, %lu", tcp->u_arg[1], tcp->u_arg[2]);
 320                         return 0;
 321                 }
 322                 tprint_iov(tcp, tcp->u_arg[2], tcp->u_arg[1], 1);
 323                 tprintf(", %lu, ", tcp->u_arg[2]);
 324                 printllval(tcp, "%llu", PREAD_OFFSET_ARG);
 325         }
 326         return 0;
 327 }
 328
 329 int
 330 sys_pwritev(struct tcb *tcp)
 331 {
 332         if (entering(tcp)) {
 333                 printfd(tcp, tcp->u_arg[0]);
 334                 tprints(", ");
 335                 tprint_iov(tcp, tcp->u_arg[2], tcp->u_arg[1], 1);
 336                 tprintf(", %lu, ", tcp->u_arg[2]);
 337                 printllval(tcp, "%llu", PREAD_OFFSET_ARG);
 338         }
 339         return 0;
 340 }
 341 #endif /* HAVE_SYS_UIO_H */
 342
 343 int
 344 sys_sendfile(struct tcb *tcp)
 345 {
 346         if (entering(tcp)) {
 347                 off_t offset;
 348
 349                 printfd(tcp, tcp->u_arg[0]);
 350                 tprints(", ");
 351                 printfd(tcp, tcp->u_arg[1]);
 352                 tprints(", ");
 353                 if (!tcp->u_arg[2])
 354                         tprints("NULL");
 355                 else if (umove(tcp, tcp->u_arg[2], &offset) < 0)
 356                         tprintf("%#lx", tcp->u_arg[2]);
 357                 else
 358                         tprintf("[%lu]", offset);
 359                 tprintf(", %lu", tcp->u_arg[3]);
 360         }
 361         return 0;
 362 }
 363
 364 static void
 365 print_loff_t(struct tcb *tcp, long addr)
 366 {
 367         loff_t offset;
 368
 369         if (!addr)
 370                 tprints("NULL");
 371         else if (umove(tcp, addr, &offset) < 0)
 372                 tprintf("%#lx", addr);
 373         else
 374                 tprintf("[%llu]", (unsigned long long int) offset);
 375 }
 376
 377 int
 378 sys_sendfile64(struct tcb *tcp)
 379 {
 380         if (entering(tcp)) {
 381                 printfd(tcp, tcp->u_arg[0]);
 382                 tprints(", ");
 383                 printfd(tcp, tcp->u_arg[1]);
 384                 tprints(", ");
 385                 print_loff_t(tcp, tcp->u_arg[2]);
 386                 tprintf(", %lu", tcp->u_arg[3]);
 387         }
 388         return 0;
 389 }
 390
 391 static const struct xlat splice_flags[] = {
 392 #ifdef SPLICE_F_MOVE
 393         { SPLICE_F_MOVE,     "SPLICE_F_MOVE"     },
 394 #endif
 395 #ifdef SPLICE_F_NONBLOCK
 396         { SPLICE_F_NONBLOCK, "SPLICE_F_NONBLOCK" },
 397 #endif
 398 #ifdef SPLICE_F_MORE
 399         { SPLICE_F_MORE,     "SPLICE_F_MORE"     },
 400 #endif
 401 #ifdef SPLICE_F_GIFT
 402         { SPLICE_F_GIFT,     "SPLICE_F_GIFT"     },
 403 #endif
 404         { 0,                 NULL                },
 405 };
 406
 407 int
 408 sys_tee(struct tcb *tcp)
 409 {
 410         if (entering(tcp)) {
 411                 /* int fd_in */
 412                 printfd(tcp, tcp->u_arg[0]);
 413                 tprints(", ");
 414                 /* int fd_out */
 415                 printfd(tcp, tcp->u_arg[1]);
 416                 tprints(", ");
 417                 /* size_t len */
 418                 tprintf("%lu, ", tcp->u_arg[2]);
 419                 /* unsigned int flags */
 420                 printflags(splice_flags, tcp->u_arg[3], "SPLICE_F_???");
 421         }
 422         return 0;
 423 }
 424
 425 int
 426 sys_splice(struct tcb *tcp)
 427 {
 428         if (entering(tcp)) {
 429                 /* int fd_in */
 430                 printfd(tcp, tcp->u_arg[0]);
 431                 tprints(", ");
 432                 /* loff_t *off_in */
 433                 print_loff_t(tcp, tcp->u_arg[1]);
 434                 tprints(", ");
 435                 /* int fd_out */
 436                 printfd(tcp, tcp->u_arg[2]);
 437                 tprints(", ");
 438                 /* loff_t *off_out */
 439                 print_loff_t(tcp, tcp->u_arg[3]);
 440                 tprints(", ");
 441                 /* size_t len */
 442                 tprintf("%lu, ", tcp->u_arg[4]);
 443                 /* unsigned int flags */
 444                 printflags(splice_flags, tcp->u_arg[5], "SPLICE_F_???");
 445         }
 446         return 0;
 447 }
 448
 449 int
 450 sys_vmsplice(struct tcb *tcp)
 451 {
 452         if (entering(tcp)) {
 453                 /* int fd */
 454                 printfd(tcp, tcp->u_arg[0]);
 455                 tprints(", ");
 456                 /* const struct iovec *iov, unsigned long nr_segs */
 457                 tprint_iov(tcp, tcp->u_arg[2], tcp->u_arg[1], 1);
 458                 tprints(", ");
 459                 /* unsigned int flags */
 460                 printflags(splice_flags, tcp->u_arg[3], "SPLICE_F_???");
 461         }
 462         return 0;
 463 }
 464 #endif /* LINUX */
 465
 466 #if _LFS64_LARGEFILE || HAVE_LONG_LONG_OFF_T
 467 int
 468 sys_pread64(struct tcb *tcp)
 469 {
 470         if (entering(tcp)) {
 471                 printfd(tcp, tcp->u_arg[0]);
 472                 tprints(", ");
 473         } else {
 474                 if (syserror(tcp))
 475                         tprintf("%#lx", tcp->u_arg[1]);
 476                 else
 477                         printstr(tcp, tcp->u_arg[1], tcp->u_rval);
 478                 tprintf(", %lu, ", tcp->u_arg[2]);
 479                 printllval(tcp, "%#llx", 3);
 480         }
 481         return 0;
 482 }
 483
 484 int
 485 sys_pwrite64(struct tcb *tcp)
 486 {
 487         if (entering(tcp)) {
 488                 printfd(tcp, tcp->u_arg[0]);
 489                 tprints(", ");
 490                 printstr(tcp, tcp->u_arg[1], tcp->u_arg[2]);
 491                 tprintf(", %lu, ", tcp->u_arg[2]);
 492                 printllval(tcp, "%#llx", 3);
 493         }
 494         return 0;
 495 }
 496 #endif
 497
 498 int
 499 sys_ioctl(struct tcb *tcp)
 500 {
 501         const struct ioctlent *iop;
 502
 503         if (entering(tcp)) {
 504                 printfd(tcp, tcp->u_arg[0]);
 505                 tprints(", ");
 506                 iop = ioctl_lookup(tcp->u_arg[1]);
 507                 if (iop) {
 508                         tprints(iop->symbol);
 509                         while ((iop = ioctl_next_match(iop)))
 510                                 tprintf(" or %s", iop->symbol);
 511                 } else
 512                         tprintf("%#lx", tcp->u_arg[1]);
 513                 ioctl_decode(tcp, tcp->u_arg[1], tcp->u_arg[2]);
 514         }
 515         else {
 516                 int ret = ioctl_decode(tcp, tcp->u_arg[1], tcp->u_arg[2]);
 517                 if (!ret)
 518                         tprintf(", %#lx", tcp->u_arg[2]);
 519                 else
 520                         return ret - 1;
 521         }
 522         return 0;
 523 }