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         printfd(tcp, tcp->u_arg[0]);
  53         tprints(", ");
  54         printstr(tcp, tcp->u_arg[1], tcp->u_arg[2]);
  55         tprintf(", %lu", tcp->u_arg[2]);
  56
  57         return RVAL_DECODED;
  58 }
  59
  60 struct print_iovec_config {
  61         enum iov_decode decode_iov;
  62         unsigned long data_size;
  63 };
  64
  65 static bool
  66 print_iovec(struct tcb *tcp, void *elem_buf, size_t elem_size, void *data)
  67 {
  68         const unsigned long *iov;
  69         unsigned long iov_buf[2], len;
  70         struct print_iovec_config *c = data;
  71
  72         if (elem_size < sizeof(iov_buf)) {
  73                 iov_buf[0] = ((unsigned int *) elem_buf)[0];
  74                 iov_buf[1] = ((unsigned int *) elem_buf)[1];
  75                 iov = iov_buf;
  76         } else {
  77                 iov = elem_buf;
  78         }
  79
  80         tprints("{iov_base=");
  81
  82         len = iov[1];
  83
  84         switch (c->decode_iov) {
  85                 case IOV_DECODE_STR:
  86                         if (len > c->data_size)
  87                                 len = c->data_size;
  88                         c->data_size -= len;
  89                         printstr(tcp, iov[0], len);
  90                         break;
  91                 case IOV_DECODE_NETLINK:
  92                         if (len > c->data_size)
  93                                 len = c->data_size;
  94                         c->data_size -= len;
  95                         decode_netlink(tcp, iov[0], iov[1]);
  96                         break;
  97                 default:
  98                         printaddr(iov[0]);
  99                         break;
 100         }
 101
 102         tprintf(", iov_len=%lu}", iov[1]);
 103
 104         return true;
 105 }
 106
 107 /*
 108  * data_size limits the cumulative size of printed data.
 109  * Example: recvmsg returing a short read.
 110  */
 111 void
 112 tprint_iov_upto(struct tcb *tcp, unsigned long len, unsigned long addr,
 113                 enum iov_decode decode_iov, unsigned long data_size)
 114 {
 115         unsigned long iov[2];
 116         struct print_iovec_config config =
 117                 { .decode_iov = decode_iov, .data_size = data_size };
 118
 119         print_array(tcp, addr, len, iov, current_wordsize * 2,
 120                     umoven_or_printaddr, print_iovec, &config);
 121 }
 122
 123 void
 124 tprint_iov(struct tcb *tcp, unsigned long len, unsigned long addr,
 125            enum iov_decode decode_iov)
 126 {
 127         tprint_iov_upto(tcp, len, addr, decode_iov, (unsigned long) -1L);
 128 }
 129
 130 SYS_FUNC(readv)
 131 {
 132         if (entering(tcp)) {
 133                 printfd(tcp, tcp->u_arg[0]);
 134                 tprints(", ");
 135         } else {
 136                 tprint_iov_upto(tcp, tcp->u_arg[2], tcp->u_arg[1],
 137                                 IOV_DECODE_STR, tcp->u_rval);
 138                 tprintf(", %lu", tcp->u_arg[2]);
 139         }
 140         return 0;
 141 }
 142
 143 SYS_FUNC(writev)
 144 {
 145         printfd(tcp, tcp->u_arg[0]);
 146         tprints(", ");
 147         tprint_iov(tcp, tcp->u_arg[2], tcp->u_arg[1], IOV_DECODE_STR);
 148         tprintf(", %lu", tcp->u_arg[2]);
 149
 150         return RVAL_DECODED;
 151 }
 152
 153 /* The SH4 ABI does allow long longs in odd-numbered registers, but
 154    does not allow them to be split between registers and memory - and
 155    there are only four argument registers for normal functions.  As a
 156    result pread takes an extra padding argument before the offset.  This
 157    was changed late in the 2.4 series (around 2.4.20).  */
 158 #if defined(SH)
 159 #define PREAD_OFFSET_ARG 4
 160 #else
 161 #define PREAD_OFFSET_ARG 3
 162 #endif
 163
 164 SYS_FUNC(pread)
 165 {
 166         if (entering(tcp)) {
 167                 printfd(tcp, tcp->u_arg[0]);
 168                 tprints(", ");
 169         } else {
 170                 if (syserror(tcp))
 171                         printaddr(tcp->u_arg[1]);
 172                 else
 173                         printstr(tcp, tcp->u_arg[1], tcp->u_rval);
 174                 tprintf(", %lu, ", tcp->u_arg[2]);
 175                 printllval(tcp, "%lld", PREAD_OFFSET_ARG);
 176         }
 177         return 0;
 178 }
 179
 180 SYS_FUNC(pwrite)
 181 {
 182         printfd(tcp, tcp->u_arg[0]);
 183         tprints(", ");
 184         printstr(tcp, tcp->u_arg[1], tcp->u_arg[2]);
 185         tprintf(", %lu, ", tcp->u_arg[2]);
 186         printllval(tcp, "%lld", PREAD_OFFSET_ARG);
 187
 188         return RVAL_DECODED;
 189 }
 190
 191 static void
 192 print_lld_from_low_high_val(struct tcb *tcp, int arg)
 193 {
 194 #if SIZEOF_LONG > 4 && SIZEOF_LONG == SIZEOF_LONG_LONG
 195 # if SUPPORTED_PERSONALITIES > 1
 196 #  ifdef X86_64
 197         if (current_personality != 1)
 198 #  else
 199         if (current_wordsize == sizeof(long))
 200 #  endif
 201 # endif
 202                 tprintf("%ld", tcp->u_arg[arg]);
 203 # if SUPPORTED_PERSONALITIES > 1
 204         else
 205                 tprintf("%ld",
 206                         ((unsigned long) tcp->u_arg[arg + 1] << current_wordsize * 8)
 207                         | (unsigned long) tcp->u_arg[arg]);
 208 # endif
 209 #elif SIZEOF_LONG > 4
 210 # error Unsupported configuration: SIZEOF_LONG > 4 && SIZEOF_LONG_LONG > SIZEOF_LONG
 211 #elif HAVE_STRUCT_TCB_EXT_ARG
 212 # if SUPPORTED_PERSONALITIES > 1
 213         if (current_personality == 1) {
 214                 tprintf("%lld",
 215                         (widen_to_ull(tcp->u_arg[arg + 1]) << sizeof(long) * 8)
 216                         | widen_to_ull(tcp->u_arg[arg]));
 217         } else
 218 # endif
 219         {
 220                 tprintf("%lld", tcp->ext_arg[arg]);
 221         }
 222 #else /* SIZEOF_LONG_LONG > SIZEOF_LONG && !HAVE_STRUCT_TCB_EXT_ARG */
 223         tprintf("%lld",
 224                 (widen_to_ull(tcp->u_arg[arg + 1]) << sizeof(long) * 8)
 225                 | widen_to_ull(tcp->u_arg[arg]));
 226 #endif
 227 }
 228
 229 #include "xlat/rwf_flags.h"
 230
 231 static int
 232 do_preadv(struct tcb *tcp, const int flags_arg)
 233 {
 234         if (entering(tcp)) {
 235                 printfd(tcp, tcp->u_arg[0]);
 236                 tprints(", ");
 237         } else {
 238                 tprint_iov_upto(tcp, tcp->u_arg[2], tcp->u_arg[1], IOV_DECODE_STR,
 239                                 tcp->u_rval);
 240                 tprintf(", %lu, ", tcp->u_arg[2]);
 241                 print_lld_from_low_high_val(tcp, 3);
 242                 if (flags_arg >= 0) {
 243                         tprints(", ");
 244                         printflags(rwf_flags, tcp->u_arg[flags_arg], "RWF_???");
 245                 }
 246         }
 247         return 0;
 248 }
 249
 250 SYS_FUNC(preadv)
 251 {
 252         return do_preadv(tcp, -1);
 253 }
 254
 255 SYS_FUNC(preadv2)
 256 {
 257         return do_preadv(tcp, 5);
 258 }
 259
 260 static int
 261 do_pwritev(struct tcb *tcp, const int flags_arg)
 262 {
 263         printfd(tcp, tcp->u_arg[0]);
 264         tprints(", ");
 265         tprint_iov(tcp, tcp->u_arg[2], tcp->u_arg[1], IOV_DECODE_STR);
 266         tprintf(", %lu, ", tcp->u_arg[2]);
 267         print_lld_from_low_high_val(tcp, 3);
 268         if (flags_arg >= 0) {
 269                 tprints(", ");
 270                 printflags(rwf_flags, tcp->u_arg[flags_arg], "RWF_???");
 271         }
 272
 273         return RVAL_DECODED;
 274 }
 275
 276 SYS_FUNC(pwritev)
 277 {
 278         return do_pwritev(tcp, -1);
 279 }
 280
 281 SYS_FUNC(pwritev2)
 282 {
 283         return do_pwritev(tcp, 5);
 284 }
 285
 286 #include "xlat/splice_flags.h"
 287
 288 SYS_FUNC(tee)
 289 {
 290         /* int fd_in */
 291         printfd(tcp, tcp->u_arg[0]);
 292         tprints(", ");
 293         /* int fd_out */
 294         printfd(tcp, tcp->u_arg[1]);
 295         tprints(", ");
 296         /* size_t len */
 297         tprintf("%lu, ", tcp->u_arg[2]);
 298         /* unsigned int flags */
 299         printflags(splice_flags, tcp->u_arg[3], "SPLICE_F_???");
 300
 301         return RVAL_DECODED;
 302 }
 303
 304 SYS_FUNC(splice)
 305 {
 306         /* int fd_in */
 307         printfd(tcp, tcp->u_arg[0]);
 308         tprints(", ");
 309         /* loff_t *off_in */
 310         printnum_int64(tcp, tcp->u_arg[1], "%" PRId64);
 311         tprints(", ");
 312         /* int fd_out */
 313         printfd(tcp, tcp->u_arg[2]);
 314         tprints(", ");
 315         /* loff_t *off_out */
 316         printnum_int64(tcp, tcp->u_arg[3], "%" PRId64);
 317         tprints(", ");
 318         /* size_t len */
 319         tprintf("%lu, ", tcp->u_arg[4]);
 320         /* unsigned int flags */
 321         printflags(splice_flags, tcp->u_arg[5], "SPLICE_F_???");
 322
 323         return RVAL_DECODED;
 324 }
 325
 326 SYS_FUNC(vmsplice)
 327 {
 328         /* int fd */
 329         printfd(tcp, tcp->u_arg[0]);
 330         tprints(", ");
 331         /* const struct iovec *iov, unsigned long nr_segs */
 332         tprint_iov(tcp, tcp->u_arg[2], tcp->u_arg[1], IOV_DECODE_STR);
 333         tprintf(", %lu, ", tcp->u_arg[2]);
 334         /* unsigned int flags */
 335         printflags(splice_flags, tcp->u_arg[3], "SPLICE_F_???");
 336
 337         return RVAL_DECODED;
 338 }