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