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
  31 #include "defs.h"
  32 #include <fcntl.h>
  33 #include <sys/uio.h>
  34
  35 int
  36 sys_read(struct tcb *tcp)
  37 {
  38         if (entering(tcp)) {
  39                 printfd(tcp, tcp->u_arg[0]);
  40                 tprints(", ");
  41         } else {
  42                 if (syserror(tcp))
  43                         tprintf("%#lx", tcp->u_arg[1]);
  44                 else
  45                         printstr(tcp, tcp->u_arg[1], tcp->u_rval);
  46                 tprintf(", %lu", tcp->u_arg[2]);
  47         }
  48         return 0;
  49 }
  50
  51 int
  52 sys_write(struct tcb *tcp)
  53 {
  54         if (entering(tcp)) {
  55                 printfd(tcp, tcp->u_arg[0]);
  56                 tprints(", ");
  57                 printstr(tcp, tcp->u_arg[1], tcp->u_arg[2]);
  58                 tprintf(", %lu", tcp->u_arg[2]);
  59         }
  60         return 0;
  61 }
  62
  63 /*
  64  * data_size limits the cumulative size of printed data.
  65  * Example: recvmsg returing a short read.
  66  */
  67 void
  68 tprint_iov_upto(struct tcb *tcp, unsigned long len, unsigned long addr, int decode_iov, unsigned long data_size)
  69 {
  70 #if SUPPORTED_PERSONALITIES > 1
  71         union {
  72                 struct { u_int32_t base; u_int32_t len; } iov32;
  73                 struct { u_int64_t base; u_int64_t len; } iov64;
  74         } iov;
  75 #define sizeof_iov \
  76         (current_wordsize == 4 ? sizeof(iov.iov32) : sizeof(iov.iov64))
  77 #define iov_iov_base \
  78         (current_wordsize == 4 ? (uint64_t) iov.iov32.base : iov.iov64.base)
  79 #define iov_iov_len \
  80         (current_wordsize == 4 ? (uint64_t) iov.iov32.len : iov.iov64.len)
  81 #else
  82         struct iovec iov;
  83 #define sizeof_iov sizeof(iov)
  84 #define iov_iov_base iov.iov_base
  85 #define iov_iov_len iov.iov_len
  86 #endif
  87         unsigned long size, cur, end, abbrev_end;
  88         int failed = 0;
  89
  90         if (!len) {
  91                 tprints("[]");
  92                 return;
  93         }
  94         size = len * sizeof_iov;
  95         end = addr + size;
  96         if (!verbose(tcp) || size / sizeof_iov != len || end < addr) {
  97                 tprintf("%#lx", addr);
  98                 return;
  99         }
 100         if (abbrev(tcp)) {
 101                 abbrev_end = addr + max_strlen * sizeof_iov;
 102                 if (abbrev_end < addr)
 103                         abbrev_end = end;
 104         } else {
 105                 abbrev_end = end;
 106         }
 107         tprints("[");
 108         for (cur = addr; cur < end; cur += sizeof_iov) {
 109                 if (cur > addr)
 110                         tprints(", ");
 111                 if (cur >= abbrev_end) {
 112                         tprints("...");
 113                         break;
 114                 }
 115                 if (umoven(tcp, cur, sizeof_iov, (char *) &iov) < 0) {
 116                         tprints("?");
 117                         failed = 1;
 118                         break;
 119                 }
 120                 tprints("{");
 121                 if (decode_iov) {
 122                         unsigned long len = iov_iov_len;
 123                         if (len > data_size)
 124                                 len = data_size;
 125                         data_size -= len;
 126                         printstr(tcp, (long) iov_iov_base, len);
 127                 } else
 128                         tprintf("%#lx", (long) iov_iov_base);
 129                 tprintf(", %lu}", (unsigned long)iov_iov_len);
 130         }
 131         tprints("]");
 132         if (failed)
 133                 tprintf(" %#lx", addr);
 134 #undef sizeof_iov
 135 #undef iov_iov_base
 136 #undef iov_iov_len
 137 }
 138
 139 void
 140 tprint_iov(struct tcb *tcp, unsigned long len, unsigned long addr, int decode_iov)
 141 {
 142         tprint_iov_upto(tcp, len, addr, decode_iov, (unsigned long) -1L);
 143 }
 144
 145 int
 146 sys_readv(struct tcb *tcp)
 147 {
 148         if (entering(tcp)) {
 149                 printfd(tcp, tcp->u_arg[0]);
 150                 tprints(", ");
 151         } else {
 152                 if (syserror(tcp)) {
 153                         tprintf("%#lx, %lu",
 154                                         tcp->u_arg[1], tcp->u_arg[2]);
 155                         return 0;
 156                 }
 157                 tprint_iov(tcp, tcp->u_arg[2], tcp->u_arg[1], 1);
 158                 tprintf(", %lu", tcp->u_arg[2]);
 159         }
 160         return 0;
 161 }
 162
 163 int
 164 sys_writev(struct tcb *tcp)
 165 {
 166         if (entering(tcp)) {
 167                 printfd(tcp, tcp->u_arg[0]);
 168                 tprints(", ");
 169                 tprint_iov(tcp, tcp->u_arg[2], tcp->u_arg[1], 1);
 170                 tprintf(", %lu", tcp->u_arg[2]);
 171         }
 172         return 0;
 173 }
 174
 175 /* The SH4 ABI does allow long longs in odd-numbered registers, but
 176    does not allow them to be split between registers and memory - and
 177    there are only four argument registers for normal functions.  As a
 178    result pread takes an extra padding argument before the offset.  This
 179    was changed late in the 2.4 series (around 2.4.20).  */
 180 #if defined(SH)
 181 #define PREAD_OFFSET_ARG 4
 182 #else
 183 #define PREAD_OFFSET_ARG 3
 184 #endif
 185
 186 int
 187 sys_pread(struct tcb *tcp)
 188 {
 189         if (entering(tcp)) {
 190                 printfd(tcp, tcp->u_arg[0]);
 191                 tprints(", ");
 192         } else {
 193                 if (syserror(tcp))
 194                         tprintf("%#lx", tcp->u_arg[1]);
 195                 else
 196                         printstr(tcp, tcp->u_arg[1], tcp->u_rval);
 197                 tprintf(", %lu, ", tcp->u_arg[2]);
 198                 printllval(tcp, "%llu", PREAD_OFFSET_ARG);
 199         }
 200         return 0;
 201 }
 202
 203 int
 204 sys_pwrite(struct tcb *tcp)
 205 {
 206         if (entering(tcp)) {
 207                 printfd(tcp, tcp->u_arg[0]);
 208                 tprints(", ");
 209                 printstr(tcp, tcp->u_arg[1], tcp->u_arg[2]);
 210                 tprintf(", %lu, ", tcp->u_arg[2]);
 211                 printllval(tcp, "%llu", PREAD_OFFSET_ARG);
 212         }
 213         return 0;
 214 }
 215
 216 static void
 217 print_llu_from_low_high_val(struct tcb *tcp, int arg)
 218 {
 219 #if SIZEOF_LONG == SIZEOF_LONG_LONG
 220         tprintf("%lu", (unsigned long) tcp->u_arg[arg]);
 221 #elif defined(LINUX_MIPSN32)
 222         tprintf("%llu", (unsigned long long) tcp->ext_arg[arg]);
 223 #else
 224 # ifdef X32
 225         if (current_personality == 0)
 226                 tprintf("%llu", (unsigned long long) tcp->ext_arg[arg]);
 227         else
 228 # endif
 229         tprintf("%llu",
 230                 ((unsigned long long) (unsigned long) tcp->u_arg[arg + 1] << sizeof(long) * 8)
 231                 | (unsigned long long) (unsigned long) tcp->u_arg[arg]);
 232 #endif
 233 }
 234
 235 int
 236 sys_preadv(struct tcb *tcp)
 237 {
 238         if (entering(tcp)) {
 239                 printfd(tcp, tcp->u_arg[0]);
 240                 tprints(", ");
 241         } else {
 242                 if (syserror(tcp)) {
 243                         tprintf("%#lx, %lu", tcp->u_arg[1], tcp->u_arg[2]);
 244                         return 0;
 245                 }
 246                 tprint_iov(tcp, tcp->u_arg[2], tcp->u_arg[1], 1);
 247                 tprintf(", %lu, ", tcp->u_arg[2]);
 248                 print_llu_from_low_high_val(tcp, 3);
 249         }
 250         return 0;
 251 }
 252
 253 int
 254 sys_pwritev(struct tcb *tcp)
 255 {
 256         if (entering(tcp)) {
 257                 printfd(tcp, tcp->u_arg[0]);
 258                 tprints(", ");
 259                 tprint_iov(tcp, tcp->u_arg[2], tcp->u_arg[1], 1);
 260                 tprintf(", %lu, ", tcp->u_arg[2]);
 261                 print_llu_from_low_high_val(tcp, 3);
 262         }
 263         return 0;
 264 }
 265
 266 static void
 267 print_off_t(struct tcb *tcp, long addr)
 268 {
 269         unsigned long offset;
 270
 271         if (!addr) {
 272                 tprints("NULL");
 273                 return;
 274         }
 275
 276 #if SUPPORTED_PERSONALITIES > 1 && SIZEOF_LONG > 4
 277         if (current_wordsize == 4) {
 278                 uint32_t off;
 279
 280                 if (umove(tcp, addr, &off) < 0)
 281                         tprintf("%#lx", addr);
 282                 else
 283                         tprintf("[%u]", off);
 284         } else
 285 #endif
 286         if (umove(tcp, addr, &offset) < 0)
 287                 tprintf("%#lx", addr);
 288         else
 289                 tprintf("[%lu]", offset);
 290 }
 291
 292 int
 293 sys_sendfile(struct tcb *tcp)
 294 {
 295         if (entering(tcp)) {
 296                 printfd(tcp, tcp->u_arg[0]);
 297                 tprints(", ");
 298                 printfd(tcp, tcp->u_arg[1]);
 299                 tprints(", ");
 300                 print_off_t(tcp, tcp->u_arg[2]);
 301                 tprintf(", %lu", tcp->u_arg[3]);
 302         }
 303         return 0;
 304 }
 305
 306 void
 307 print_loff_t(struct tcb *tcp, long addr)
 308 {
 309         loff_t offset;
 310
 311         if (!addr)
 312                 tprints("NULL");
 313         else if (umove(tcp, addr, &offset) < 0)
 314                 tprintf("%#lx", addr);
 315         else
 316                 tprintf("[%llu]", (unsigned long long int) offset);
 317 }
 318
 319 int
 320 sys_sendfile64(struct tcb *tcp)
 321 {
 322         if (entering(tcp)) {
 323                 printfd(tcp, tcp->u_arg[0]);
 324                 tprints(", ");
 325                 printfd(tcp, tcp->u_arg[1]);
 326                 tprints(", ");
 327                 print_loff_t(tcp, tcp->u_arg[2]);
 328                 tprintf(", %lu", tcp->u_arg[3]);
 329         }
 330         return 0;
 331 }
 332
 333 #include "xlat/splice_flags.h"
 334
 335 int
 336 sys_tee(struct tcb *tcp)
 337 {
 338         if (entering(tcp)) {
 339                 /* int fd_in */
 340                 printfd(tcp, tcp->u_arg[0]);
 341                 tprints(", ");
 342                 /* int fd_out */
 343                 printfd(tcp, tcp->u_arg[1]);
 344                 tprints(", ");
 345                 /* size_t len */
 346                 tprintf("%lu, ", tcp->u_arg[2]);
 347                 /* unsigned int flags */
 348                 printflags(splice_flags, tcp->u_arg[3], "SPLICE_F_???");
 349         }
 350         return 0;
 351 }
 352
 353 int
 354 sys_splice(struct tcb *tcp)
 355 {
 356         if (entering(tcp)) {
 357                 /* int fd_in */
 358                 printfd(tcp, tcp->u_arg[0]);
 359                 tprints(", ");
 360                 /* loff_t *off_in */
 361                 print_loff_t(tcp, tcp->u_arg[1]);
 362                 tprints(", ");
 363                 /* int fd_out */
 364                 printfd(tcp, tcp->u_arg[2]);
 365                 tprints(", ");
 366                 /* loff_t *off_out */
 367                 print_loff_t(tcp, tcp->u_arg[3]);
 368                 tprints(", ");
 369                 /* size_t len */
 370                 tprintf("%lu, ", tcp->u_arg[4]);
 371                 /* unsigned int flags */
 372                 printflags(splice_flags, tcp->u_arg[5], "SPLICE_F_???");
 373         }
 374         return 0;
 375 }
 376
 377 int
 378 sys_vmsplice(struct tcb *tcp)
 379 {
 380         if (entering(tcp)) {
 381                 /* int fd */
 382                 printfd(tcp, tcp->u_arg[0]);
 383                 tprints(", ");
 384                 /* const struct iovec *iov, unsigned long nr_segs */
 385                 tprint_iov(tcp, tcp->u_arg[2], tcp->u_arg[1], 1);
 386                 tprintf(", %lu, ", tcp->u_arg[2]);
 387                 /* unsigned int flags */
 388                 printflags(splice_flags, tcp->u_arg[3], "SPLICE_F_???");
 389         }
 390         return 0;
 391 }
 392
 393 int
 394 sys_ioctl(struct tcb *tcp)
 395 {
 396         const struct_ioctlent *iop;
 397
 398         if (entering(tcp)) {
 399                 printfd(tcp, tcp->u_arg[0]);
 400                 tprints(", ");
 401                 if (!ioctl_decode_command_number(tcp->u_arg[1])) {
 402                         iop = ioctl_lookup(tcp->u_arg[1]);
 403                         if (iop) {
 404                                 tprints(iop->symbol);
 405                                 while ((iop = ioctl_next_match(iop)))
 406                                         tprintf(" or %s", iop->symbol);
 407                         } else {
 408                                 ioctl_print_code(tcp->u_arg[1]);
 409                         }
 410                 }
 411                 ioctl_decode(tcp, tcp->u_arg[1], tcp->u_arg[2]);
 412         }
 413         else {
 414                 int ret = ioctl_decode(tcp, tcp->u_arg[1], tcp->u_arg[2]);
 415                 if (!ret)
 416                         tprintf(", %#lx", tcp->u_arg[2]);
 417                 else
 418                         return ret - 1;
 419         }
 420         return 0;
 421 }