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                         printaddr(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
  87         if (!len) {
  88                 tprints("[]");
  89                 return;
  90         }
  91         size = len * sizeof_iov;
  92         end = addr + size;
  93         if (!verbose(tcp) || (exiting(tcp) && syserror(tcp)) ||
  94             !addr || size / sizeof_iov != len || end < addr) {
  95                 printaddr(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_or_printaddr(tcp, cur, sizeof_iov, &iov))
 114                         break;
 115                 tprints("{");
 116                 if (decode_iov) {
 117                         unsigned long len = iov_iov_len;
 118                         if (len > data_size)
 119                                 len = data_size;
 120                         data_size -= len;
 121                         printstr(tcp, (long) iov_iov_base, len);
 122                 } else
 123                         printaddr((long) iov_iov_base);
 124                 tprintf(", %lu}", (unsigned long)iov_iov_len);
 125         }
 126         tprints("]");
 127 #undef sizeof_iov
 128 #undef iov_iov_base
 129 #undef iov_iov_len
 130 }
 131
 132 void
 133 tprint_iov(struct tcb *tcp, unsigned long len, unsigned long addr, int decode_iov)
 134 {
 135         tprint_iov_upto(tcp, len, addr, decode_iov, (unsigned long) -1L);
 136 }
 137
 138 SYS_FUNC(readv)
 139 {
 140         if (entering(tcp)) {
 141                 printfd(tcp, tcp->u_arg[0]);
 142                 tprints(", ");
 143         } else {
 144                 tprint_iov(tcp, tcp->u_arg[2], tcp->u_arg[1], 1);
 145                 tprintf(", %lu", tcp->u_arg[2]);
 146         }
 147         return 0;
 148 }
 149
 150 SYS_FUNC(writev)
 151 {
 152         if (entering(tcp)) {
 153                 printfd(tcp, tcp->u_arg[0]);
 154                 tprints(", ");
 155                 tprint_iov(tcp, tcp->u_arg[2], tcp->u_arg[1], 1);
 156                 tprintf(", %lu", tcp->u_arg[2]);
 157         }
 158         return 0;
 159 }
 160
 161 /* The SH4 ABI does allow long longs in odd-numbered registers, but
 162    does not allow them to be split between registers and memory - and
 163    there are only four argument registers for normal functions.  As a
 164    result pread takes an extra padding argument before the offset.  This
 165    was changed late in the 2.4 series (around 2.4.20).  */
 166 #if defined(SH)
 167 #define PREAD_OFFSET_ARG 4
 168 #else
 169 #define PREAD_OFFSET_ARG 3
 170 #endif
 171
 172 SYS_FUNC(pread)
 173 {
 174         if (entering(tcp)) {
 175                 printfd(tcp, tcp->u_arg[0]);
 176                 tprints(", ");
 177         } else {
 178                 if (syserror(tcp))
 179                         printaddr(tcp->u_arg[1]);
 180                 else
 181                         printstr(tcp, tcp->u_arg[1], tcp->u_rval);
 182                 tprintf(", %lu, ", tcp->u_arg[2]);
 183                 printllval(tcp, "%llu", PREAD_OFFSET_ARG);
 184         }
 185         return 0;
 186 }
 187
 188 SYS_FUNC(pwrite)
 189 {
 190         if (entering(tcp)) {
 191                 printfd(tcp, tcp->u_arg[0]);
 192                 tprints(", ");
 193                 printstr(tcp, tcp->u_arg[1], tcp->u_arg[2]);
 194                 tprintf(", %lu, ", tcp->u_arg[2]);
 195                 printllval(tcp, "%llu", PREAD_OFFSET_ARG);
 196         }
 197         return 0;
 198 }
 199
 200 static void
 201 print_llu_from_low_high_val(struct tcb *tcp, int arg)
 202 {
 203 #if SIZEOF_LONG == SIZEOF_LONG_LONG
 204 # if SUPPORTED_PERSONALITIES > 1
 205         if (current_wordsize == sizeof(long))
 206 # endif
 207                 tprintf("%lu", (unsigned long) tcp->u_arg[arg]);
 208 # if SUPPORTED_PERSONALITIES > 1
 209         else
 210                 tprintf("%lu",
 211                         ((unsigned long) tcp->u_arg[arg + 1] << current_wordsize * 8)
 212                         | (unsigned long) tcp->u_arg[arg]);
 213 # endif
 214 #else
 215 # ifdef X32
 216         if (current_personality == 0)
 217                 tprintf("%llu", (unsigned long long) tcp->ext_arg[arg]);
 218         else
 219 # endif
 220         tprintf("%llu",
 221                 ((unsigned long long) (unsigned long) tcp->u_arg[arg + 1] << sizeof(long) * 8)
 222                 | (unsigned long long) (unsigned long) tcp->u_arg[arg]);
 223 #endif
 224 }
 225
 226 SYS_FUNC(preadv)
 227 {
 228         if (entering(tcp)) {
 229                 printfd(tcp, tcp->u_arg[0]);
 230                 tprints(", ");
 231         } else {
 232                 tprint_iov(tcp, tcp->u_arg[2], tcp->u_arg[1], 1);
 233                 tprintf(", %lu, ", tcp->u_arg[2]);
 234                 print_llu_from_low_high_val(tcp, 3);
 235         }
 236         return 0;
 237 }
 238
 239 SYS_FUNC(pwritev)
 240 {
 241         if (entering(tcp)) {
 242                 printfd(tcp, tcp->u_arg[0]);
 243                 tprints(", ");
 244                 tprint_iov(tcp, tcp->u_arg[2], tcp->u_arg[1], 1);
 245                 tprintf(", %lu, ", tcp->u_arg[2]);
 246                 print_llu_from_low_high_val(tcp, 3);
 247         }
 248         return 0;
 249 }
 250
 251 static void
 252 print_off_t(struct tcb *tcp, long addr)
 253 {
 254         if (current_wordsize == sizeof(int))
 255                 printnum_int(tcp, addr, "%u");
 256         else
 257                 printnum_long(tcp, addr, "%lu");
 258 }
 259
 260 SYS_FUNC(sendfile)
 261 {
 262         if (entering(tcp)) {
 263                 printfd(tcp, tcp->u_arg[0]);
 264                 tprints(", ");
 265                 printfd(tcp, tcp->u_arg[1]);
 266                 tprints(", ");
 267                 print_off_t(tcp, tcp->u_arg[2]);
 268                 tprintf(", %lu", tcp->u_arg[3]);
 269         }
 270         return 0;
 271 }
 272
 273 SYS_FUNC(sendfile64)
 274 {
 275         if (entering(tcp)) {
 276                 printfd(tcp, tcp->u_arg[0]);
 277                 tprints(", ");
 278                 printfd(tcp, tcp->u_arg[1]);
 279                 tprints(", ");
 280                 printnum_int64(tcp, tcp->u_arg[2], "%" PRIu64);
 281                 tprintf(", %lu", tcp->u_arg[3]);
 282         }
 283         return 0;
 284 }
 285
 286 #include "xlat/splice_flags.h"
 287
 288 SYS_FUNC(tee)
 289 {
 290         if (entering(tcp)) {
 291                 /* int fd_in */
 292                 printfd(tcp, tcp->u_arg[0]);
 293                 tprints(", ");
 294                 /* int fd_out */
 295                 printfd(tcp, tcp->u_arg[1]);
 296                 tprints(", ");
 297                 /* size_t len */
 298                 tprintf("%lu, ", tcp->u_arg[2]);
 299                 /* unsigned int flags */
 300                 printflags(splice_flags, tcp->u_arg[3], "SPLICE_F_???");
 301         }
 302         return 0;
 303 }
 304
 305 SYS_FUNC(splice)
 306 {
 307         if (entering(tcp)) {
 308                 /* int fd_in */
 309                 printfd(tcp, tcp->u_arg[0]);
 310                 tprints(", ");
 311                 /* loff_t *off_in */
 312                 printnum_int64(tcp, tcp->u_arg[1], "%" PRIu64);
 313                 tprints(", ");
 314                 /* int fd_out */
 315                 printfd(tcp, tcp->u_arg[2]);
 316                 tprints(", ");
 317                 /* loff_t *off_out */
 318                 printnum_int64(tcp, tcp->u_arg[3], "%" PRIu64);
 319                 tprints(", ");
 320                 /* size_t len */
 321                 tprintf("%lu, ", tcp->u_arg[4]);
 322                 /* unsigned int flags */
 323                 printflags(splice_flags, tcp->u_arg[5], "SPLICE_F_???");
 324         }
 325         return 0;
 326 }
 327
 328 SYS_FUNC(vmsplice)
 329 {
 330         if (entering(tcp)) {
 331                 /* int fd */
 332                 printfd(tcp, tcp->u_arg[0]);
 333                 tprints(", ");
 334                 /* const struct iovec *iov, unsigned long nr_segs */
 335                 tprint_iov(tcp, tcp->u_arg[2], tcp->u_arg[1], 1);
 336                 tprintf(", %lu, ", tcp->u_arg[2]);
 337                 /* unsigned int flags */
 338                 printflags(splice_flags, tcp->u_arg[3], "SPLICE_F_???");
 339         }
 340         return 0;
 341 }