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 int
 222 sys_preadv(struct tcb *tcp)
 223 {
 224         if (entering(tcp)) {
 225                 printfd(tcp, tcp->u_arg[0]);
 226                 tprints(", ");
 227         } else {
 228                 if (syserror(tcp)) {
 229                         tprintf("%#lx, %lu", tcp->u_arg[1], tcp->u_arg[2]);
 230                         return 0;
 231                 }
 232                 tprint_iov(tcp, tcp->u_arg[2], tcp->u_arg[1], 1);
 233                 tprintf(", %lu, ", tcp->u_arg[2]);
 234                 printllval(tcp, "%llu", PREAD_OFFSET_ARG);
 235         }
 236         return 0;
 237 }
 238
 239 int
 240 sys_pwritev(struct tcb *tcp)
 241 {
 242         if (entering(tcp)) {
 243                 printfd(tcp, tcp->u_arg[0]);
 244                 tprints(", ");
 245                 tprint_iov(tcp, tcp->u_arg[2], tcp->u_arg[1], 1);
 246                 tprintf(", %lu, ", tcp->u_arg[2]);
 247                 printllval(tcp, "%llu", PREAD_OFFSET_ARG);
 248         }
 249         return 0;
 250 }
 251 #endif /* HAVE_SYS_UIO_H */
 252
 253 static void
 254 print_off_t(struct tcb *tcp, long addr)
 255 {
 256         unsigned long offset;
 257
 258         if (!addr) {
 259                 tprints("NULL");
 260                 return;
 261         }
 262
 263 #if SUPPORTED_PERSONALITIES > 1 && SIZEOF_LONG > 4
 264         if (current_wordsize == 4) {
 265                 uint32_t off;
 266
 267                 if (umove(tcp, addr, &off) < 0)
 268                         tprintf("%#lx", addr);
 269                 else
 270                         tprintf("[%u]", off);
 271         } else
 272 #endif
 273         if (umove(tcp, addr, &offset) < 0)
 274                 tprintf("%#lx", addr);
 275         else
 276                 tprintf("[%lu]", offset);
 277 }
 278
 279 int
 280 sys_sendfile(struct tcb *tcp)
 281 {
 282         if (entering(tcp)) {
 283                 printfd(tcp, tcp->u_arg[0]);
 284                 tprints(", ");
 285                 printfd(tcp, tcp->u_arg[1]);
 286                 tprints(", ");
 287                 print_off_t(tcp, tcp->u_arg[2]);
 288                 tprintf(", %lu", tcp->u_arg[3]);
 289         }
 290         return 0;
 291 }
 292
 293 void
 294 print_loff_t(struct tcb *tcp, long addr)
 295 {
 296         loff_t offset;
 297
 298         if (!addr)
 299                 tprints("NULL");
 300         else if (umove(tcp, addr, &offset) < 0)
 301                 tprintf("%#lx", addr);
 302         else
 303                 tprintf("[%llu]", (unsigned long long int) offset);
 304 }
 305
 306 int
 307 sys_sendfile64(struct tcb *tcp)
 308 {
 309         if (entering(tcp)) {
 310                 printfd(tcp, tcp->u_arg[0]);
 311                 tprints(", ");
 312                 printfd(tcp, tcp->u_arg[1]);
 313                 tprints(", ");
 314                 print_loff_t(tcp, tcp->u_arg[2]);
 315                 tprintf(", %lu", tcp->u_arg[3]);
 316         }
 317         return 0;
 318 }
 319
 320 static const struct xlat splice_flags[] = {
 321 #ifdef SPLICE_F_MOVE
 322         XLAT(SPLICE_F_MOVE),
 323 #endif
 324 #ifdef SPLICE_F_NONBLOCK
 325         XLAT(SPLICE_F_NONBLOCK),
 326 #endif
 327 #ifdef SPLICE_F_MORE
 328         XLAT(SPLICE_F_MORE),
 329 #endif
 330 #ifdef SPLICE_F_GIFT
 331         XLAT(SPLICE_F_GIFT),
 332 #endif
 333         { 0,                 NULL                },
 334 };
 335
 336 int
 337 sys_tee(struct tcb *tcp)
 338 {
 339         if (entering(tcp)) {
 340                 /* int fd_in */
 341                 printfd(tcp, tcp->u_arg[0]);
 342                 tprints(", ");
 343                 /* int fd_out */
 344                 printfd(tcp, tcp->u_arg[1]);
 345                 tprints(", ");
 346                 /* size_t len */
 347                 tprintf("%lu, ", tcp->u_arg[2]);
 348                 /* unsigned int flags */
 349                 printflags(splice_flags, tcp->u_arg[3], "SPLICE_F_???");
 350         }
 351         return 0;
 352 }
 353
 354 int
 355 sys_splice(struct tcb *tcp)
 356 {
 357         if (entering(tcp)) {
 358                 /* int fd_in */
 359                 printfd(tcp, tcp->u_arg[0]);
 360                 tprints(", ");
 361                 /* loff_t *off_in */
 362                 print_loff_t(tcp, tcp->u_arg[1]);
 363                 tprints(", ");
 364                 /* int fd_out */
 365                 printfd(tcp, tcp->u_arg[2]);
 366                 tprints(", ");
 367                 /* loff_t *off_out */
 368                 print_loff_t(tcp, tcp->u_arg[3]);
 369                 tprints(", ");
 370                 /* size_t len */
 371                 tprintf("%lu, ", tcp->u_arg[4]);
 372                 /* unsigned int flags */
 373                 printflags(splice_flags, tcp->u_arg[5], "SPLICE_F_???");
 374         }
 375         return 0;
 376 }
 377
 378 int
 379 sys_vmsplice(struct tcb *tcp)
 380 {
 381         if (entering(tcp)) {
 382                 /* int fd */
 383                 printfd(tcp, tcp->u_arg[0]);
 384                 tprints(", ");
 385                 /* const struct iovec *iov, unsigned long nr_segs */
 386                 tprint_iov(tcp, tcp->u_arg[2], tcp->u_arg[1], 1);
 387                 tprintf(", %lu, ", tcp->u_arg[2]);
 388                 /* unsigned int flags */
 389                 printflags(splice_flags, tcp->u_arg[3], "SPLICE_F_???");
 390         }
 391         return 0;
 392 }
 393
 394 int
 395 sys_ioctl(struct tcb *tcp)
 396 {
 397         const struct_ioctlent *iop;
 398
 399         if (entering(tcp)) {
 400                 printfd(tcp, tcp->u_arg[0]);
 401                 tprints(", ");
 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                         tprintf("%#lx", tcp->u_arg[1]);
 409                 ioctl_decode(tcp, tcp->u_arg[1], tcp->u_arg[2]);
 410         }
 411         else {
 412                 int ret = ioctl_decode(tcp, tcp->u_arg[1], tcp->u_arg[2]);
 413                 if (!ret)
 414                         tprintf(", %#lx", tcp->u_arg[2]);
 415                 else
 416                         return ret - 1;
 417         }
 418         return 0;
 419 }