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  *      $Id$
  31  */
  32
  33 #include "defs.h"
  34
  35 #include <fcntl.h>
  36 #if HAVE_SYS_UIO_H
  37 #include <sys/uio.h>
  38 #endif
  39
  40 int
  41 sys_read(struct tcb *tcp)
  42 {
  43         if (entering(tcp)) {
  44                 printfd(tcp, tcp->u_arg[0]);
  45                 tprints(", ");
  46         } else {
  47                 if (syserror(tcp))
  48                         tprintf("%#lx", tcp->u_arg[1]);
  49                 else
  50                         printstr(tcp, tcp->u_arg[1], tcp->u_rval);
  51                 tprintf(", %lu", tcp->u_arg[2]);
  52         }
  53         return 0;
  54 }
  55
  56 int
  57 sys_write(struct tcb *tcp)
  58 {
  59         if (entering(tcp)) {
  60                 printfd(tcp, tcp->u_arg[0]);
  61                 tprints(", ");
  62                 printstr(tcp, tcp->u_arg[1], tcp->u_arg[2]);
  63                 tprintf(", %lu", tcp->u_arg[2]);
  64         }
  65         return 0;
  66 }
  67
  68 #if HAVE_SYS_UIO_H
  69 void
  70 tprint_iov(struct tcb *tcp, unsigned long len, unsigned long addr, int decode_iov)
  71 {
  72 #if SUPPORTED_PERSONALITIES > 1
  73         union {
  74                 struct { u_int32_t base; u_int32_t len; } iov32;
  75                 struct { u_int64_t base; u_int64_t len; } iov64;
  76         } iov;
  77 #define sizeof_iov \
  78   (personality_wordsize[current_personality] == 4 \
  79    ? sizeof(iov.iov32) : sizeof(iov.iov64))
  80 #define iov_iov_base \
  81   (personality_wordsize[current_personality] == 4 \
  82    ? (u_int64_t) iov.iov32.base : iov.iov64.base)
  83 #define iov_iov_len \
  84   (personality_wordsize[current_personality] == 4 \
  85    ? (u_int64_t) iov.iov32.len : iov.iov64.len)
  86 #else
  87         struct iovec iov;
  88 #define sizeof_iov sizeof(iov)
  89 #define iov_iov_base iov.iov_base
  90 #define iov_iov_len iov.iov_len
  91 #endif
  92         unsigned long size, cur, end, abbrev_end;
  93         int failed = 0;
  94
  95         if (!len) {
  96                 tprints("[]");
  97                 return;
  98         }
  99         size = len * sizeof_iov;
 100         end = addr + size;
 101         if (!verbose(tcp) || size / sizeof_iov != len || end < addr) {
 102                 tprintf("%#lx", addr);
 103                 return;
 104         }
 105         if (abbrev(tcp)) {
 106                 abbrev_end = addr + max_strlen * sizeof_iov;
 107                 if (abbrev_end < addr)
 108                         abbrev_end = end;
 109         } else {
 110                 abbrev_end = end;
 111         }
 112         tprints("[");
 113         for (cur = addr; cur < end; cur += sizeof_iov) {
 114                 if (cur > addr)
 115                         tprints(", ");
 116                 if (cur >= abbrev_end) {
 117                         tprints("...");
 118                         break;
 119                 }
 120                 if (umoven(tcp, cur, sizeof_iov, (char *) &iov) < 0) {
 121                         tprints("?");
 122                         failed = 1;
 123                         break;
 124                 }
 125                 tprints("{");
 126                 if (decode_iov)
 127                         printstr(tcp, (long) iov_iov_base, iov_iov_len);
 128                 else
 129                         tprintf("%#lx", (long) iov_iov_base);
 130                 tprintf(", %lu}", (unsigned long)iov_iov_len);
 131         }
 132         tprints("]");
 133         if (failed)
 134                 tprintf(" %#lx", addr);
 135 #undef sizeof_iov
 136 #undef iov_iov_base
 137 #undef iov_iov_len
 138 }
 139
 140 int
 141 sys_readv(struct tcb *tcp)
 142 {
 143         if (entering(tcp)) {
 144                 printfd(tcp, tcp->u_arg[0]);
 145                 tprints(", ");
 146         } else {
 147                 if (syserror(tcp)) {
 148                         tprintf("%#lx, %lu",
 149                                         tcp->u_arg[1], tcp->u_arg[2]);
 150                         return 0;
 151                 }
 152                 tprint_iov(tcp, tcp->u_arg[2], tcp->u_arg[1], 1);
 153                 tprintf(", %lu", tcp->u_arg[2]);
 154         }
 155         return 0;
 156 }
 157
 158 int
 159 sys_writev(struct tcb *tcp)
 160 {
 161         if (entering(tcp)) {
 162                 printfd(tcp, tcp->u_arg[0]);
 163                 tprints(", ");
 164                 tprint_iov(tcp, tcp->u_arg[2], tcp->u_arg[1], 1);
 165                 tprintf(", %lu", tcp->u_arg[2]);
 166         }
 167         return 0;
 168 }
 169 #endif
 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 int
 183 sys_pread(struct tcb *tcp)
 184 {
 185         if (entering(tcp)) {
 186                 printfd(tcp, tcp->u_arg[0]);
 187                 tprints(", ");
 188         } else {
 189                 if (syserror(tcp))
 190                         tprintf("%#lx", tcp->u_arg[1]);
 191                 else
 192                         printstr(tcp, tcp->u_arg[1], tcp->u_rval);
 193                 tprintf(", %lu, ", tcp->u_arg[2]);
 194                 printllval(tcp, "%llu", PREAD_OFFSET_ARG);
 195         }
 196         return 0;
 197 }
 198
 199 int
 200 sys_pwrite(struct tcb *tcp)
 201 {
 202         if (entering(tcp)) {
 203                 printfd(tcp, tcp->u_arg[0]);
 204                 tprints(", ");
 205                 printstr(tcp, tcp->u_arg[1], tcp->u_arg[2]);
 206                 tprintf(", %lu, ", tcp->u_arg[2]);
 207                 printllval(tcp, "%llu", PREAD_OFFSET_ARG);
 208         }
 209         return 0;
 210 }
 211
 212 #if HAVE_SYS_UIO_H
 213 int
 214 sys_preadv(struct tcb *tcp)
 215 {
 216         if (entering(tcp)) {
 217                 printfd(tcp, tcp->u_arg[0]);
 218                 tprints(", ");
 219         } else {
 220                 if (syserror(tcp)) {
 221                         tprintf("%#lx, %lu", tcp->u_arg[1], tcp->u_arg[2]);
 222                         return 0;
 223                 }
 224                 tprint_iov(tcp, tcp->u_arg[2], tcp->u_arg[1], 1);
 225                 tprintf(", %lu, ", tcp->u_arg[2]);
 226                 printllval(tcp, "%llu", PREAD_OFFSET_ARG);
 227         }
 228         return 0;
 229 }
 230
 231 int
 232 sys_pwritev(struct tcb *tcp)
 233 {
 234         if (entering(tcp)) {
 235                 printfd(tcp, tcp->u_arg[0]);
 236                 tprints(", ");
 237                 tprint_iov(tcp, tcp->u_arg[2], tcp->u_arg[1], 1);
 238                 tprintf(", %lu, ", tcp->u_arg[2]);
 239                 printllval(tcp, "%llu", PREAD_OFFSET_ARG);
 240         }
 241         return 0;
 242 }
 243 #endif /* HAVE_SYS_UIO_H */
 244
 245 int
 246 sys_sendfile(struct tcb *tcp)
 247 {
 248         if (entering(tcp)) {
 249                 off_t offset;
 250
 251                 printfd(tcp, tcp->u_arg[0]);
 252                 tprints(", ");
 253                 printfd(tcp, tcp->u_arg[1]);
 254                 tprints(", ");
 255                 if (!tcp->u_arg[2])
 256                         tprints("NULL");
 257                 else if (umove(tcp, tcp->u_arg[2], &offset) < 0)
 258                         tprintf("%#lx", tcp->u_arg[2]);
 259                 else
 260 #ifdef HAVE_LONG_LONG_OFF_T
 261                         tprintf("[%llu]", offset);
 262 #else
 263                         tprintf("[%lu]", offset);
 264 #endif
 265                 tprintf(", %lu", tcp->u_arg[3]);
 266         }
 267         return 0;
 268 }
 269
 270 static void
 271 print_loff_t(struct tcb *tcp, long addr)
 272 {
 273         loff_t offset;
 274
 275         if (!addr)
 276                 tprints("NULL");
 277         else if (umove(tcp, addr, &offset) < 0)
 278                 tprintf("%#lx", addr);
 279         else
 280                 tprintf("[%llu]", (unsigned long long int) offset);
 281 }
 282
 283 int
 284 sys_sendfile64(struct tcb *tcp)
 285 {
 286         if (entering(tcp)) {
 287                 printfd(tcp, tcp->u_arg[0]);
 288                 tprints(", ");
 289                 printfd(tcp, tcp->u_arg[1]);
 290                 tprints(", ");
 291                 print_loff_t(tcp, tcp->u_arg[2]);
 292                 tprintf(", %lu", tcp->u_arg[3]);
 293         }
 294         return 0;
 295 }
 296
 297 static const struct xlat splice_flags[] = {
 298 #ifdef SPLICE_F_MOVE
 299         { SPLICE_F_MOVE,     "SPLICE_F_MOVE"     },
 300 #endif
 301 #ifdef SPLICE_F_NONBLOCK
 302         { SPLICE_F_NONBLOCK, "SPLICE_F_NONBLOCK" },
 303 #endif
 304 #ifdef SPLICE_F_MORE
 305         { SPLICE_F_MORE,     "SPLICE_F_MORE"     },
 306 #endif
 307 #ifdef SPLICE_F_GIFT
 308         { SPLICE_F_GIFT,     "SPLICE_F_GIFT"     },
 309 #endif
 310         { 0,                 NULL                },
 311 };
 312
 313 int
 314 sys_tee(struct tcb *tcp)
 315 {
 316         if (entering(tcp)) {
 317                 /* int fd_in */
 318                 printfd(tcp, tcp->u_arg[0]);
 319                 tprints(", ");
 320                 /* int fd_out */
 321                 printfd(tcp, tcp->u_arg[1]);
 322                 tprints(", ");
 323                 /* size_t len */
 324                 tprintf("%lu, ", tcp->u_arg[2]);
 325                 /* unsigned int flags */
 326                 printflags(splice_flags, tcp->u_arg[3], "SPLICE_F_???");
 327         }
 328         return 0;
 329 }
 330
 331 int
 332 sys_splice(struct tcb *tcp)
 333 {
 334         if (entering(tcp)) {
 335                 /* int fd_in */
 336                 printfd(tcp, tcp->u_arg[0]);
 337                 tprints(", ");
 338                 /* loff_t *off_in */
 339                 print_loff_t(tcp, tcp->u_arg[1]);
 340                 tprints(", ");
 341                 /* int fd_out */
 342                 printfd(tcp, tcp->u_arg[2]);
 343                 tprints(", ");
 344                 /* loff_t *off_out */
 345                 print_loff_t(tcp, tcp->u_arg[3]);
 346                 tprints(", ");
 347                 /* size_t len */
 348                 tprintf("%lu, ", tcp->u_arg[4]);
 349                 /* unsigned int flags */
 350                 printflags(splice_flags, tcp->u_arg[5], "SPLICE_F_???");
 351         }
 352         return 0;
 353 }
 354
 355 int
 356 sys_vmsplice(struct tcb *tcp)
 357 {
 358         if (entering(tcp)) {
 359                 /* int fd */
 360                 printfd(tcp, tcp->u_arg[0]);
 361                 tprints(", ");
 362                 /* const struct iovec *iov, unsigned long nr_segs */
 363                 tprint_iov(tcp, tcp->u_arg[2], tcp->u_arg[1], 1);
 364                 tprints(", ");
 365                 /* unsigned int flags */
 366                 printflags(splice_flags, tcp->u_arg[3], "SPLICE_F_???");
 367         }
 368         return 0;
 369 }
 370
 371 int
 372 sys_ioctl(struct tcb *tcp)
 373 {
 374         const struct ioctlent *iop;
 375
 376         if (entering(tcp)) {
 377                 printfd(tcp, tcp->u_arg[0]);
 378                 tprints(", ");
 379                 iop = ioctl_lookup(tcp->u_arg[1]);
 380                 if (iop) {
 381                         tprints(iop->symbol);
 382                         while ((iop = ioctl_next_match(iop)))
 383                                 tprintf(" or %s", iop->symbol);
 384                 } else
 385                         tprintf("%#lx", tcp->u_arg[1]);
 386                 ioctl_decode(tcp, tcp->u_arg[1], tcp->u_arg[2]);
 387         }
 388         else {
 389                 int ret = ioctl_decode(tcp, tcp->u_arg[1], tcp->u_arg[2]);
 390                 if (!ret)
 391                         tprintf(", %#lx", tcp->u_arg[2]);
 392                 else
 393                         return ret - 1;
 394         }
 395         return 0;
 396 }