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