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 /*
  61  * data_size limits the cumulative size of printed data.
  62  * Example: recvmsg returing a short read.
  63  */
  64 void
  65 tprint_iov_upto(struct tcb *tcp, unsigned long len, unsigned long addr, int decode_iov, unsigned long data_size)
  66 {
  67         unsigned long iov[2];
  68         unsigned long size, cur, end, abbrev_end;
  69         const unsigned long sizeof_iov = current_wordsize * 2;
  70
  71         if (!len) {
  72                 tprints("[]");
  73                 return;
  74         }
  75         size = len * sizeof_iov;
  76         end = addr + size;
  77         if (!verbose(tcp) || (exiting(tcp) && syserror(tcp)) ||
  78             !addr || size / sizeof_iov != len || end < addr) {
  79                 printaddr(addr);
  80                 return;
  81         }
  82         if (abbrev(tcp)) {
  83                 abbrev_end = addr + max_strlen * sizeof_iov;
  84                 if (abbrev_end < addr)
  85                         abbrev_end = end;
  86         } else {
  87                 abbrev_end = end;
  88         }
  89         if (addr >= abbrev_end) {
  90                 tprints("[...]");
  91                 return;
  92         }
  93         for (cur = addr; cur < end; cur += sizeof_iov) {
  94                 if (cur > addr) {
  95                         tprints(", ");
  96                         if (cur >= abbrev_end) {
  97                                 tprints("...");
  98                                 break;
  99                         }
 100                 }
 101                 if (umove_ulong_array_or_printaddr(tcp, cur, iov,
 102                                                    ARRAY_SIZE(iov)))
 103                         break;
 104                 if (cur <= addr)
 105                         tprints("[");
 106                 tprints("{");
 107                 if (decode_iov) {
 108                         unsigned long len = iov[1];
 109                         if (len > data_size)
 110                                 len = data_size;
 111                         data_size -= len;
 112                         printstr(tcp, iov[0], len);
 113                 } else
 114                         printaddr(iov[0]);
 115                 tprintf(", %lu}", iov[1]);
 116         }
 117         if (cur > addr)
 118                 tprints("]");
 119 }
 120
 121 void
 122 tprint_iov(struct tcb *tcp, unsigned long len, unsigned long addr, int decode_iov)
 123 {
 124         tprint_iov_upto(tcp, len, addr, decode_iov, (unsigned long) -1L);
 125 }
 126
 127 SYS_FUNC(readv)
 128 {
 129         if (entering(tcp)) {
 130                 printfd(tcp, tcp->u_arg[0]);
 131                 tprints(", ");
 132         } else {
 133                 tprint_iov_upto(tcp, tcp->u_arg[2], tcp->u_arg[1], 1,
 134                                 tcp->u_rval);
 135                 tprintf(", %lu", tcp->u_arg[2]);
 136         }
 137         return 0;
 138 }
 139
 140 SYS_FUNC(writev)
 141 {
 142         printfd(tcp, tcp->u_arg[0]);
 143         tprints(", ");
 144         tprint_iov(tcp, tcp->u_arg[2], tcp->u_arg[1], 1);
 145         tprintf(", %lu", tcp->u_arg[2]);
 146
 147         return RVAL_DECODED;
 148 }
 149
 150 /* The SH4 ABI does allow long longs in odd-numbered registers, but
 151    does not allow them to be split between registers and memory - and
 152    there are only four argument registers for normal functions.  As a
 153    result pread takes an extra padding argument before the offset.  This
 154    was changed late in the 2.4 series (around 2.4.20).  */
 155 #if defined(SH)
 156 #define PREAD_OFFSET_ARG 4
 157 #else
 158 #define PREAD_OFFSET_ARG 3
 159 #endif
 160
 161 SYS_FUNC(pread)
 162 {
 163         if (entering(tcp)) {
 164                 printfd(tcp, tcp->u_arg[0]);
 165                 tprints(", ");
 166         } else {
 167                 if (syserror(tcp))
 168                         printaddr(tcp->u_arg[1]);
 169                 else
 170                         printstr(tcp, tcp->u_arg[1], tcp->u_rval);
 171                 tprintf(", %lu, ", tcp->u_arg[2]);
 172                 printllval(tcp, "%lld", PREAD_OFFSET_ARG);
 173         }
 174         return 0;
 175 }
 176
 177 SYS_FUNC(pwrite)
 178 {
 179         printfd(tcp, tcp->u_arg[0]);
 180         tprints(", ");
 181         printstr(tcp, tcp->u_arg[1], tcp->u_arg[2]);
 182         tprintf(", %lu, ", tcp->u_arg[2]);
 183         printllval(tcp, "%lld", PREAD_OFFSET_ARG);
 184
 185         return RVAL_DECODED;
 186 }
 187
 188 static void
 189 print_lld_from_low_high_val(struct tcb *tcp, int arg)
 190 {
 191 #if SIZEOF_LONG == SIZEOF_LONG_LONG
 192 # if SUPPORTED_PERSONALITIES > 1
 193 #  ifdef X86_64
 194         if (current_personality != 1)
 195 #  else
 196         if (current_wordsize == sizeof(long))
 197 #  endif
 198 # endif
 199                 tprintf("%ld", tcp->u_arg[arg]);
 200 # if SUPPORTED_PERSONALITIES > 1
 201         else
 202                 tprintf("%ld",
 203                         ((unsigned long) tcp->u_arg[arg + 1] << current_wordsize * 8)
 204                         | (unsigned long) tcp->u_arg[arg]);
 205 # endif
 206 #else
 207 # ifdef X32
 208         if (current_personality == 0)
 209                 tprintf("%lld", tcp->ext_arg[arg]);
 210         else
 211 # endif
 212         tprintf("%lld",
 213                 ((unsigned long long) (unsigned long) tcp->u_arg[arg + 1] << sizeof(long) * 8)
 214                 | (unsigned long long) (unsigned long) tcp->u_arg[arg]);
 215 #endif
 216 }
 217
 218 SYS_FUNC(preadv)
 219 {
 220         if (entering(tcp)) {
 221                 printfd(tcp, tcp->u_arg[0]);
 222                 tprints(", ");
 223         } else {
 224                 tprint_iov_upto(tcp, tcp->u_arg[2], tcp->u_arg[1], 1,
 225                                 tcp->u_rval);
 226                 tprintf(", %lu, ", tcp->u_arg[2]);
 227                 print_lld_from_low_high_val(tcp, 3);
 228         }
 229         return 0;
 230 }
 231
 232 SYS_FUNC(pwritev)
 233 {
 234         printfd(tcp, tcp->u_arg[0]);
 235         tprints(", ");
 236         tprint_iov(tcp, tcp->u_arg[2], tcp->u_arg[1], 1);
 237         tprintf(", %lu, ", tcp->u_arg[2]);
 238         print_lld_from_low_high_val(tcp, 3);
 239
 240         return RVAL_DECODED;
 241 }
 242
 243 #include "xlat/splice_flags.h"
 244
 245 SYS_FUNC(tee)
 246 {
 247         /* int fd_in */
 248         printfd(tcp, tcp->u_arg[0]);
 249         tprints(", ");
 250         /* int fd_out */
 251         printfd(tcp, tcp->u_arg[1]);
 252         tprints(", ");
 253         /* size_t len */
 254         tprintf("%lu, ", tcp->u_arg[2]);
 255         /* unsigned int flags */
 256         printflags(splice_flags, tcp->u_arg[3], "SPLICE_F_???");
 257
 258         return RVAL_DECODED;
 259 }
 260
 261 SYS_FUNC(splice)
 262 {
 263         /* int fd_in */
 264         printfd(tcp, tcp->u_arg[0]);
 265         tprints(", ");
 266         /* loff_t *off_in */
 267         printnum_int64(tcp, tcp->u_arg[1], "%" PRId64);
 268         tprints(", ");
 269         /* int fd_out */
 270         printfd(tcp, tcp->u_arg[2]);
 271         tprints(", ");
 272         /* loff_t *off_out */
 273         printnum_int64(tcp, tcp->u_arg[3], "%" PRId64);
 274         tprints(", ");
 275         /* size_t len */
 276         tprintf("%lu, ", tcp->u_arg[4]);
 277         /* unsigned int flags */
 278         printflags(splice_flags, tcp->u_arg[5], "SPLICE_F_???");
 279
 280         return RVAL_DECODED;
 281 }
 282
 283 SYS_FUNC(vmsplice)
 284 {
 285         /* int fd */
 286         printfd(tcp, tcp->u_arg[0]);
 287         tprints(", ");
 288         /* const struct iovec *iov, unsigned long nr_segs */
 289         tprint_iov(tcp, tcp->u_arg[2], tcp->u_arg[1], 1);
 290         tprintf(", %lu, ", tcp->u_arg[2]);
 291         /* unsigned int flags */
 292         printflags(splice_flags, tcp->u_arg[3], "SPLICE_F_???");
 293
 294         return RVAL_DECODED;
 295 }