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 SYS_FUNC(read)
  36 {
  37         if (entering(tcp)) {
  38                 printfd(tcp, tcp->u_arg[0]);
  39                 tprints(", ");
  40         } else {
  41                 if (syserror(tcp))
  42                         tprintf("%#lx", tcp->u_arg[1]);
  43                 else
  44                         printstr(tcp, tcp->u_arg[1], tcp->u_rval);
  45                 tprintf(", %lu", tcp->u_arg[2]);
  46         }
  47         return 0;
  48 }
  49
  50 SYS_FUNC(write)
  51 {
  52         if (entering(tcp)) {
  53                 printfd(tcp, tcp->u_arg[0]);
  54                 tprints(", ");
  55                 printstr(tcp, tcp->u_arg[1], tcp->u_arg[2]);
  56                 tprintf(", %lu", tcp->u_arg[2]);
  57         }
  58         return 0;
  59 }
  60
  61 /*
  62  * data_size limits the cumulative size of printed data.
  63  * Example: recvmsg returing a short read.
  64  */
  65 void
  66 tprint_iov_upto(struct tcb *tcp, unsigned long len, unsigned long addr, int decode_iov, unsigned long data_size)
  67 {
  68 #if SUPPORTED_PERSONALITIES > 1
  69         union {
  70                 struct { u_int32_t base; u_int32_t len; } iov32;
  71                 struct { u_int64_t base; u_int64_t len; } iov64;
  72         } iov;
  73 #define sizeof_iov \
  74         (current_wordsize == 4 ? sizeof(iov.iov32) : sizeof(iov.iov64))
  75 #define iov_iov_base \
  76         (current_wordsize == 4 ? (uint64_t) iov.iov32.base : iov.iov64.base)
  77 #define iov_iov_len \
  78         (current_wordsize == 4 ? (uint64_t) iov.iov32.len : iov.iov64.len)
  79 #else
  80         struct iovec iov;
  81 #define sizeof_iov sizeof(iov)
  82 #define iov_iov_base iov.iov_base
  83 #define iov_iov_len iov.iov_len
  84 #endif
  85         unsigned long size, cur, end, abbrev_end;
  86         int failed = 0;
  87
  88         if (!len) {
  89                 tprints("[]");
  90                 return;
  91         }
  92         size = len * sizeof_iov;
  93         end = addr + size;
  94         if (!verbose(tcp) || size / sizeof_iov != len || end < addr) {
  95                 tprintf("%#lx", addr);
  96                 return;
  97         }
  98         if (abbrev(tcp)) {
  99                 abbrev_end = addr + max_strlen * sizeof_iov;
 100                 if (abbrev_end < addr)
 101                         abbrev_end = end;
 102         } else {
 103                 abbrev_end = end;
 104         }
 105         tprints("[");
 106         for (cur = addr; cur < end; cur += sizeof_iov) {
 107                 if (cur > addr)
 108                         tprints(", ");
 109                 if (cur >= abbrev_end) {
 110                         tprints("...");
 111                         break;
 112                 }
 113                 if (umoven(tcp, cur, sizeof_iov, &iov) < 0) {
 114                         tprints("?");
 115                         failed = 1;
 116                         break;
 117                 }
 118                 tprints("{");
 119                 if (decode_iov) {
 120                         unsigned long len = iov_iov_len;
 121                         if (len > data_size)
 122                                 len = data_size;
 123                         data_size -= len;
 124                         printstr(tcp, (long) iov_iov_base, len);
 125                 } else
 126                         tprintf("%#lx", (long) iov_iov_base);
 127                 tprintf(", %lu}", (unsigned long)iov_iov_len);
 128         }
 129         tprints("]");
 130         if (failed)
 131                 tprintf(" %#lx", addr);
 132 #undef sizeof_iov
 133 #undef iov_iov_base
 134 #undef iov_iov_len
 135 }
 136
 137 void
 138 tprint_iov(struct tcb *tcp, unsigned long len, unsigned long addr, int decode_iov)
 139 {
 140         tprint_iov_upto(tcp, len, addr, decode_iov, (unsigned long) -1L);
 141 }
 142
 143 SYS_FUNC(readv)
 144 {
 145         if (entering(tcp)) {
 146                 printfd(tcp, tcp->u_arg[0]);
 147                 tprints(", ");
 148         } else {
 149                 if (syserror(tcp)) {
 150                         tprintf("%#lx, %lu",
 151                                         tcp->u_arg[1], tcp->u_arg[2]);
 152                         return 0;
 153                 }
 154                 tprint_iov(tcp, tcp->u_arg[2], tcp->u_arg[1], 1);
 155                 tprintf(", %lu", tcp->u_arg[2]);
 156         }
 157         return 0;
 158 }
 159
 160 SYS_FUNC(writev)
 161 {
 162         if (entering(tcp)) {
 163                 printfd(tcp, tcp->u_arg[0]);
 164                 tprints(", ");
 165                 tprint_iov(tcp, tcp->u_arg[2], tcp->u_arg[1], 1);
 166                 tprintf(", %lu", tcp->u_arg[2]);
 167         }
 168         return 0;
 169 }
 170
 171 /* The SH4 ABI does allow long longs in odd-numbered registers, but
 172    does not allow them to be split between registers and memory - and
 173    there are only four argument registers for normal functions.  As a
 174    result pread takes an extra padding argument before the offset.  This
 175    was changed late in the 2.4 series (around 2.4.20).  */
 176 #if defined(SH)
 177 #define PREAD_OFFSET_ARG 4
 178 #else
 179 #define PREAD_OFFSET_ARG 3
 180 #endif
 181
 182 SYS_FUNC(pread)
 183 {
 184         if (entering(tcp)) {
 185                 printfd(tcp, tcp->u_arg[0]);
 186                 tprints(", ");
 187         } else {
 188                 if (syserror(tcp))
 189                         tprintf("%#lx", tcp->u_arg[1]);
 190                 else
 191                         printstr(tcp, tcp->u_arg[1], tcp->u_rval);
 192                 tprintf(", %lu, ", tcp->u_arg[2]);
 193                 printllval(tcp, "%llu", PREAD_OFFSET_ARG);
 194         }
 195         return 0;
 196 }
 197
 198 SYS_FUNC(pwrite)
 199 {
 200         if (entering(tcp)) {
 201                 printfd(tcp, tcp->u_arg[0]);
 202                 tprints(", ");
 203                 printstr(tcp, tcp->u_arg[1], tcp->u_arg[2]);
 204                 tprintf(", %lu, ", tcp->u_arg[2]);
 205                 printllval(tcp, "%llu", PREAD_OFFSET_ARG);
 206         }
 207         return 0;
 208 }
 209
 210 static void
 211 print_llu_from_low_high_val(struct tcb *tcp, int arg)
 212 {
 213 #if SIZEOF_LONG == SIZEOF_LONG_LONG
 214 # if SUPPORTED_PERSONALITIES > 1
 215         if (current_wordsize == sizeof(long))
 216 # endif
 217                 tprintf("%lu", (unsigned long) tcp->u_arg[arg]);
 218 # if SUPPORTED_PERSONALITIES > 1
 219         else
 220                 tprintf("%lu",
 221                         ((unsigned long) tcp->u_arg[arg + 1] << current_wordsize * 8)
 222                         | (unsigned long) tcp->u_arg[arg]);
 223 # endif
 224 #else
 225 # ifdef X32
 226         if (current_personality == 0)
 227                 tprintf("%llu", (unsigned long long) tcp->ext_arg[arg]);
 228         else
 229 # endif
 230         tprintf("%llu",
 231                 ((unsigned long long) (unsigned long) tcp->u_arg[arg + 1] << sizeof(long) * 8)
 232                 | (unsigned long long) (unsigned long) tcp->u_arg[arg]);
 233 #endif
 234 }
 235
 236 SYS_FUNC(preadv)
 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 SYS_FUNC(pwritev)
 254 {
 255         if (entering(tcp)) {
 256                 printfd(tcp, tcp->u_arg[0]);
 257                 tprints(", ");
 258                 tprint_iov(tcp, tcp->u_arg[2], tcp->u_arg[1], 1);
 259                 tprintf(", %lu, ", tcp->u_arg[2]);
 260                 print_llu_from_low_high_val(tcp, 3);
 261         }
 262         return 0;
 263 }
 264
 265 static void
 266 print_off_t(struct tcb *tcp, long addr)
 267 {
 268         unsigned long offset;
 269
 270         if (!addr) {
 271                 tprints("NULL");
 272                 return;
 273         }
 274
 275 #if SUPPORTED_PERSONALITIES > 1 && SIZEOF_LONG > 4
 276         if (current_wordsize == 4) {
 277                 uint32_t off;
 278
 279                 if (umove(tcp, addr, &off) < 0)
 280                         tprintf("%#lx", addr);
 281                 else
 282                         tprintf("[%u]", off);
 283         } else
 284 #endif
 285         if (umove(tcp, addr, &offset) < 0)
 286                 tprintf("%#lx", addr);
 287         else
 288                 tprintf("[%lu]", offset);
 289 }
 290
 291 SYS_FUNC(sendfile)
 292 {
 293         if (entering(tcp)) {
 294                 printfd(tcp, tcp->u_arg[0]);
 295                 tprints(", ");
 296                 printfd(tcp, tcp->u_arg[1]);
 297                 tprints(", ");
 298                 print_off_t(tcp, tcp->u_arg[2]);
 299                 tprintf(", %lu", tcp->u_arg[3]);
 300         }
 301         return 0;
 302 }
 303
 304 void
 305 print_loff_t(struct tcb *tcp, long addr)
 306 {
 307         loff_t offset;
 308
 309         if (!addr)
 310                 tprints("NULL");
 311         else if (umove(tcp, addr, &offset) < 0)
 312                 tprintf("%#lx", addr);
 313         else
 314                 tprintf("[%llu]", (unsigned long long int) offset);
 315 }
 316
 317 SYS_FUNC(sendfile64)
 318 {
 319         if (entering(tcp)) {
 320                 printfd(tcp, tcp->u_arg[0]);
 321                 tprints(", ");
 322                 printfd(tcp, tcp->u_arg[1]);
 323                 tprints(", ");
 324                 print_loff_t(tcp, tcp->u_arg[2]);
 325                 tprintf(", %lu", tcp->u_arg[3]);
 326         }
 327         return 0;
 328 }
 329
 330 #include "xlat/splice_flags.h"
 331
 332 SYS_FUNC(tee)
 333 {
 334         if (entering(tcp)) {
 335                 /* int fd_in */
 336                 printfd(tcp, tcp->u_arg[0]);
 337                 tprints(", ");
 338                 /* int fd_out */
 339                 printfd(tcp, tcp->u_arg[1]);
 340                 tprints(", ");
 341                 /* size_t len */
 342                 tprintf("%lu, ", tcp->u_arg[2]);
 343                 /* unsigned int flags */
 344                 printflags(splice_flags, tcp->u_arg[3], "SPLICE_F_???");
 345         }
 346         return 0;
 347 }
 348
 349 SYS_FUNC(splice)
 350 {
 351         if (entering(tcp)) {
 352                 /* int fd_in */
 353                 printfd(tcp, tcp->u_arg[0]);
 354                 tprints(", ");
 355                 /* loff_t *off_in */
 356                 print_loff_t(tcp, tcp->u_arg[1]);
 357                 tprints(", ");
 358                 /* int fd_out */
 359                 printfd(tcp, tcp->u_arg[2]);
 360                 tprints(", ");
 361                 /* loff_t *off_out */
 362                 print_loff_t(tcp, tcp->u_arg[3]);
 363                 tprints(", ");
 364                 /* size_t len */
 365                 tprintf("%lu, ", tcp->u_arg[4]);
 366                 /* unsigned int flags */
 367                 printflags(splice_flags, tcp->u_arg[5], "SPLICE_F_???");
 368         }
 369         return 0;
 370 }
 371
 372 SYS_FUNC(vmsplice)
 373 {
 374         if (entering(tcp)) {
 375                 /* int fd */
 376                 printfd(tcp, tcp->u_arg[0]);
 377                 tprints(", ");
 378                 /* const struct iovec *iov, unsigned long nr_segs */
 379                 tprint_iov(tcp, tcp->u_arg[2], tcp->u_arg[1], 1);
 380                 tprintf(", %lu, ", tcp->u_arg[2]);
 381                 /* unsigned int flags */
 382                 printflags(splice_flags, tcp->u_arg[3], "SPLICE_F_???");
 383         }
 384         return 0;
 385 }
 386
 387 SYS_FUNC(ioctl)
 388 {
 389         const struct_ioctlent *iop;
 390
 391         if (entering(tcp)) {
 392                 printfd(tcp, tcp->u_arg[0]);
 393                 tprints(", ");
 394                 if (!ioctl_decode_command_number(tcp->u_arg[1])) {
 395                         iop = ioctl_lookup(tcp->u_arg[1]);
 396                         if (iop) {
 397                                 tprints(iop->symbol);
 398                                 while ((iop = ioctl_next_match(iop)))
 399                                         tprintf(" or %s", iop->symbol);
 400                         } else {
 401                                 ioctl_print_code(tcp->u_arg[1]);
 402                         }
 403                 }
 404                 ioctl_decode(tcp, tcp->u_arg[1], tcp->u_arg[2]);
 405         }
 406         else {
 407                 int ret = ioctl_decode(tcp, tcp->u_arg[1], tcp->u_arg[2]);
 408                 if (!ret)
 409                         tprintf(", %#lx", tcp->u_arg[2]);
 410                 else
 411                         return ret - 1;
 412         }
 413         return 0;
 414 }