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 #if HAVE_SYS_UIO_H
  34 # include <sys/uio.h>
  35 #endif
  36
  37 int
  38 sys_read(struct tcb *tcp)
  39 {
  40         if (entering(tcp)) {
  41                 printfd(tcp, tcp->u_arg[0]);
  42                 tprints(", ");
  43         } else {
  44                 if (syserror(tcp))
  45                         tprintf("%#lx", tcp->u_arg[1]);
  46                 else
  47                         printstr(tcp, tcp->u_arg[1], tcp->u_rval);
  48                 tprintf(", %lu", tcp->u_arg[2]);
  49         }
  50         return 0;
  51 }
  52
  53 int
  54 sys_write(struct tcb *tcp)
  55 {
  56         if (entering(tcp)) {
  57                 printfd(tcp, tcp->u_arg[0]);
  58                 tprints(", ");
  59                 printstr(tcp, tcp->u_arg[1], tcp->u_arg[2]);
  60                 tprintf(", %lu", tcp->u_arg[2]);
  61         }
  62         return 0;
  63 }
  64
  65 #if HAVE_SYS_UIO_H
  66 /*
  67  * data_size limits the cumulative size of printed data.
  68  * Example: recvmsg returing a short read.
  69  */
  70 void
  71 tprint_iov_upto(struct tcb *tcp, unsigned long len, unsigned long addr, int decode_iov, unsigned long data_size)
  72 {
  73 #if SUPPORTED_PERSONALITIES > 1
  74         union {
  75                 struct { u_int32_t base; u_int32_t len; } iov32;
  76                 struct { u_int64_t base; u_int64_t len; } iov64;
  77         } iov;
  78 #define sizeof_iov \
  79         (current_wordsize == 4 ? sizeof(iov.iov32) : sizeof(iov.iov64))
  80 #define iov_iov_base \
  81         (current_wordsize == 4 ? (uint64_t) iov.iov32.base : iov.iov64.base)
  82 #define iov_iov_len \
  83         (current_wordsize == 4 ? (uint64_t) iov.iov32.len : iov.iov64.len)
  84 #else
  85         struct iovec iov;
  86 #define sizeof_iov sizeof(iov)
  87 #define iov_iov_base iov.iov_base
  88 #define iov_iov_len iov.iov_len
  89 #endif
  90         unsigned long size, cur, end, abbrev_end;
  91         int failed = 0;
  92
  93         if (!len) {
  94                 tprints("[]");
  95                 return;
  96         }
  97         size = len * sizeof_iov;
  98         end = addr + size;
  99         if (!verbose(tcp) || size / sizeof_iov != len || end < addr) {
 100                 tprintf("%#lx", addr);
 101                 return;
 102         }
 103         if (abbrev(tcp)) {
 104                 abbrev_end = addr + max_strlen * sizeof_iov;
 105                 if (abbrev_end < addr)
 106                         abbrev_end = end;
 107         } else {
 108                 abbrev_end = end;
 109         }
 110         tprints("[");
 111         for (cur = addr; cur < end; cur += sizeof_iov) {
 112                 if (cur > addr)
 113                         tprints(", ");
 114                 if (cur >= abbrev_end) {
 115                         tprints("...");
 116                         break;
 117                 }
 118                 if (umoven(tcp, cur, sizeof_iov, (char *) &iov) < 0) {
 119                         tprints("?");
 120                         failed = 1;
 121                         break;
 122                 }
 123                 tprints("{");
 124                 if (decode_iov) {
 125                         unsigned long len = iov_iov_len;
 126                         if (len > data_size)
 127                                 len = data_size;
 128                         data_size -= len;
 129                         printstr(tcp, (long) iov_iov_base, len);
 130                 } else
 131                         tprintf("%#lx", (long) iov_iov_base);
 132                 tprintf(", %lu}", (unsigned long)iov_iov_len);
 133         }
 134         tprints("]");
 135         if (failed)
 136                 tprintf(" %#lx", addr);
 137 #undef sizeof_iov
 138 #undef iov_iov_base
 139 #undef iov_iov_len
 140 }
 141
 142 void
 143 tprint_iov(struct tcb *tcp, unsigned long len, unsigned long addr, int decode_iov)
 144 {
 145         tprint_iov_upto(tcp, len, addr, decode_iov, (unsigned long) -1L);
 146 }
 147
 148 int
 149 sys_readv(struct tcb *tcp)
 150 {
 151         if (entering(tcp)) {
 152                 printfd(tcp, tcp->u_arg[0]);
 153                 tprints(", ");
 154         } else {
 155                 if (syserror(tcp)) {
 156                         tprintf("%#lx, %lu",
 157                                         tcp->u_arg[1], tcp->u_arg[2]);
 158                         return 0;
 159                 }
 160                 tprint_iov(tcp, tcp->u_arg[2], tcp->u_arg[1], 1);
 161                 tprintf(", %lu", tcp->u_arg[2]);
 162         }
 163         return 0;
 164 }
 165
 166 int
 167 sys_writev(struct tcb *tcp)
 168 {
 169         if (entering(tcp)) {
 170                 printfd(tcp, tcp->u_arg[0]);
 171                 tprints(", ");
 172                 tprint_iov(tcp, tcp->u_arg[2], tcp->u_arg[1], 1);
 173                 tprintf(", %lu", tcp->u_arg[2]);
 174         }
 175         return 0;
 176 }
 177 #endif
 178
 179 /* The SH4 ABI does allow long longs in odd-numbered registers, but
 180    does not allow them to be split between registers and memory - and
 181    there are only four argument registers for normal functions.  As a
 182    result pread takes an extra padding argument before the offset.  This
 183    was changed late in the 2.4 series (around 2.4.20).  */
 184 #if defined(SH)
 185 #define PREAD_OFFSET_ARG 4
 186 #else
 187 #define PREAD_OFFSET_ARG 3
 188 #endif
 189
 190 int
 191 sys_pread(struct tcb *tcp)
 192 {
 193         if (entering(tcp)) {
 194                 printfd(tcp, tcp->u_arg[0]);
 195                 tprints(", ");
 196         } else {
 197                 if (syserror(tcp))
 198                         tprintf("%#lx", tcp->u_arg[1]);
 199                 else
 200                         printstr(tcp, tcp->u_arg[1], tcp->u_rval);
 201                 tprintf(", %lu, ", tcp->u_arg[2]);
 202                 printllval(tcp, "%llu", PREAD_OFFSET_ARG);
 203         }
 204         return 0;
 205 }
 206
 207 int
 208 sys_pwrite(struct tcb *tcp)
 209 {
 210         if (entering(tcp)) {
 211                 printfd(tcp, tcp->u_arg[0]);
 212                 tprints(", ");
 213                 printstr(tcp, tcp->u_arg[1], tcp->u_arg[2]);
 214                 tprintf(", %lu, ", tcp->u_arg[2]);
 215                 printllval(tcp, "%llu", PREAD_OFFSET_ARG);
 216         }
 217         return 0;
 218 }
 219
 220 #if HAVE_SYS_UIO_H
 221
 222 static void
 223 print_llu_from_low_high_val(struct tcb *tcp, int arg)
 224 {
 225 #if SIZEOF_LONG == SIZEOF_LONG_LONG
 226         tprintf("%llu", (unsigned long long) tcp->u_arg[arg]);
 227 #elif defined(LINUX_MIPSN32)
 228         tprintf("%llu", (unsigned long long) tcp->ext_arg[arg]);
 229 #else
 230 # ifdef X32
 231         if (current_personality == 0)
 232                 tprintf("%llu", (unsigned long long) tcp->ext_arg[arg]);
 233         else
 234 # endif
 235         tprintf("%llu",
 236                 ((unsigned long long) tcp->u_arg[arg + 1] << (sizeof(long) * 8))
 237                 | (unsigned long long) tcp->u_arg[arg]);
 238 #endif
 239 }
 240
 241 int
 242 sys_preadv(struct tcb *tcp)
 243 {
 244         if (entering(tcp)) {
 245                 printfd(tcp, tcp->u_arg[0]);
 246                 tprints(", ");
 247         } else {
 248                 if (syserror(tcp)) {
 249                         tprintf("%#lx, %lu", tcp->u_arg[1], tcp->u_arg[2]);
 250                         return 0;
 251                 }
 252                 tprint_iov(tcp, tcp->u_arg[2], tcp->u_arg[1], 1);
 253                 tprintf(", %lu, ", tcp->u_arg[2]);
 254                 print_llu_from_low_high_val(tcp, 3);
 255         }
 256         return 0;
 257 }
 258
 259 int
 260 sys_pwritev(struct tcb *tcp)
 261 {
 262         if (entering(tcp)) {
 263                 printfd(tcp, tcp->u_arg[0]);
 264                 tprints(", ");
 265                 tprint_iov(tcp, tcp->u_arg[2], tcp->u_arg[1], 1);
 266                 tprintf(", %lu, ", tcp->u_arg[2]);
 267                 print_llu_from_low_high_val(tcp, 3);
 268         }
 269         return 0;
 270 }
 271 #endif /* HAVE_SYS_UIO_H */
 272
 273 static void
 274 print_off_t(struct tcb *tcp, long addr)
 275 {
 276         unsigned long offset;
 277
 278         if (!addr) {
 279                 tprints("NULL");
 280                 return;
 281         }
 282
 283 #if SUPPORTED_PERSONALITIES > 1 && SIZEOF_LONG > 4
 284         if (current_wordsize == 4) {
 285                 uint32_t off;
 286
 287                 if (umove(tcp, addr, &off) < 0)
 288                         tprintf("%#lx", addr);
 289                 else
 290                         tprintf("[%u]", off);
 291         } else
 292 #endif
 293         if (umove(tcp, addr, &offset) < 0)
 294                 tprintf("%#lx", addr);
 295         else
 296                 tprintf("[%lu]", offset);
 297 }
 298
 299 int
 300 sys_sendfile(struct tcb *tcp)
 301 {
 302         if (entering(tcp)) {
 303                 printfd(tcp, tcp->u_arg[0]);
 304                 tprints(", ");
 305                 printfd(tcp, tcp->u_arg[1]);
 306                 tprints(", ");
 307                 print_off_t(tcp, tcp->u_arg[2]);
 308                 tprintf(", %lu", tcp->u_arg[3]);
 309         }
 310         return 0;
 311 }
 312
 313 void
 314 print_loff_t(struct tcb *tcp, long addr)
 315 {
 316         loff_t offset;
 317
 318         if (!addr)
 319                 tprints("NULL");
 320         else if (umove(tcp, addr, &offset) < 0)
 321                 tprintf("%#lx", addr);
 322         else
 323                 tprintf("[%llu]", (unsigned long long int) offset);
 324 }
 325
 326 int
 327 sys_sendfile64(struct tcb *tcp)
 328 {
 329         if (entering(tcp)) {
 330                 printfd(tcp, tcp->u_arg[0]);
 331                 tprints(", ");
 332                 printfd(tcp, tcp->u_arg[1]);
 333                 tprints(", ");
 334                 print_loff_t(tcp, tcp->u_arg[2]);
 335                 tprintf(", %lu", tcp->u_arg[3]);
 336         }
 337         return 0;
 338 }
 339
 340 #include "xlat/splice_flags.h"
 341
 342 int
 343 sys_tee(struct tcb *tcp)
 344 {
 345         if (entering(tcp)) {
 346                 /* int fd_in */
 347                 printfd(tcp, tcp->u_arg[0]);
 348                 tprints(", ");
 349                 /* int fd_out */
 350                 printfd(tcp, tcp->u_arg[1]);
 351                 tprints(", ");
 352                 /* size_t len */
 353                 tprintf("%lu, ", tcp->u_arg[2]);
 354                 /* unsigned int flags */
 355                 printflags(splice_flags, tcp->u_arg[3], "SPLICE_F_???");
 356         }
 357         return 0;
 358 }
 359
 360 int
 361 sys_splice(struct tcb *tcp)
 362 {
 363         if (entering(tcp)) {
 364                 /* int fd_in */
 365                 printfd(tcp, tcp->u_arg[0]);
 366                 tprints(", ");
 367                 /* loff_t *off_in */
 368                 print_loff_t(tcp, tcp->u_arg[1]);
 369                 tprints(", ");
 370                 /* int fd_out */
 371                 printfd(tcp, tcp->u_arg[2]);
 372                 tprints(", ");
 373                 /* loff_t *off_out */
 374                 print_loff_t(tcp, tcp->u_arg[3]);
 375                 tprints(", ");
 376                 /* size_t len */
 377                 tprintf("%lu, ", tcp->u_arg[4]);
 378                 /* unsigned int flags */
 379                 printflags(splice_flags, tcp->u_arg[5], "SPLICE_F_???");
 380         }
 381         return 0;
 382 }
 383
 384 int
 385 sys_vmsplice(struct tcb *tcp)
 386 {
 387         if (entering(tcp)) {
 388                 /* int fd */
 389                 printfd(tcp, tcp->u_arg[0]);
 390                 tprints(", ");
 391                 /* const struct iovec *iov, unsigned long nr_segs */
 392                 tprint_iov(tcp, tcp->u_arg[2], tcp->u_arg[1], 1);
 393                 tprintf(", %lu, ", tcp->u_arg[2]);
 394                 /* unsigned int flags */
 395                 printflags(splice_flags, tcp->u_arg[3], "SPLICE_F_???");
 396         }
 397         return 0;
 398 }
 399
 400 int
 401 sys_ioctl(struct tcb *tcp)
 402 {
 403         const struct_ioctlent *iop;
 404
 405         if (entering(tcp)) {
 406                 printfd(tcp, tcp->u_arg[0]);
 407                 tprints(", ");
 408                 iop = ioctl_lookup(tcp->u_arg[1]);
 409                 if (iop) {
 410                         tprints(iop->symbol);
 411                         while ((iop = ioctl_next_match(iop)))
 412                                 tprintf(" or %s", iop->symbol);
 413                 } else
 414                         tprintf("%#lx", tcp->u_arg[1]);
 415                 ioctl_decode(tcp, tcp->u_arg[1], tcp->u_arg[2]);
 416         }
 417         else {
 418                 int ret = ioctl_decode(tcp, tcp->u_arg[1], tcp->u_arg[2]);
 419                 if (!ret)
 420                         tprintf(", %#lx", tcp->u_arg[2]);
 421                 else
 422                         return ret - 1;
 423         }
 424         return 0;
 425 }