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         tprints("[");
  90         for (cur = addr; cur < end; cur += sizeof_iov) {
  91                 if (cur > addr)
  92                         tprints(", ");
  93                 if (cur >= abbrev_end) {
  94                         tprints("...");
  95                         break;
  96                 }
  97                 if (umove_ulong_array_or_printaddr(tcp, cur, iov,
  98                                                    ARRAY_SIZE(iov)))
  99                         break;
 100                 tprints("{");
 101                 if (decode_iov) {
 102                         unsigned long len = iov[1];
 103                         if (len > data_size)
 104                                 len = data_size;
 105                         data_size -= len;
 106                         printstr(tcp, iov[0], len);
 107                 } else
 108                         printaddr(iov[0]);
 109                 tprintf(", %lu}", iov[1]);
 110         }
 111         tprints("]");
 112 }
 113
 114 void
 115 tprint_iov(struct tcb *tcp, unsigned long len, unsigned long addr, int decode_iov)
 116 {
 117         tprint_iov_upto(tcp, len, addr, decode_iov, (unsigned long) -1L);
 118 }
 119
 120 SYS_FUNC(readv)
 121 {
 122         if (entering(tcp)) {
 123                 printfd(tcp, tcp->u_arg[0]);
 124                 tprints(", ");
 125         } else {
 126                 tprint_iov(tcp, tcp->u_arg[2], tcp->u_arg[1], 1);
 127                 tprintf(", %lu", tcp->u_arg[2]);
 128         }
 129         return 0;
 130 }
 131
 132 SYS_FUNC(writev)
 133 {
 134         printfd(tcp, tcp->u_arg[0]);
 135         tprints(", ");
 136         tprint_iov(tcp, tcp->u_arg[2], tcp->u_arg[1], 1);
 137         tprintf(", %lu", tcp->u_arg[2]);
 138
 139         return RVAL_DECODED;
 140 }
 141
 142 /* The SH4 ABI does allow long longs in odd-numbered registers, but
 143    does not allow them to be split between registers and memory - and
 144    there are only four argument registers for normal functions.  As a
 145    result pread takes an extra padding argument before the offset.  This
 146    was changed late in the 2.4 series (around 2.4.20).  */
 147 #if defined(SH)
 148 #define PREAD_OFFSET_ARG 4
 149 #else
 150 #define PREAD_OFFSET_ARG 3
 151 #endif
 152
 153 SYS_FUNC(pread)
 154 {
 155         if (entering(tcp)) {
 156                 printfd(tcp, tcp->u_arg[0]);
 157                 tprints(", ");
 158         } else {
 159                 if (syserror(tcp))
 160                         printaddr(tcp->u_arg[1]);
 161                 else
 162                         printstr(tcp, tcp->u_arg[1], tcp->u_rval);
 163                 tprintf(", %lu, ", tcp->u_arg[2]);
 164                 printllval(tcp, "%llu", PREAD_OFFSET_ARG);
 165         }
 166         return 0;
 167 }
 168
 169 SYS_FUNC(pwrite)
 170 {
 171         printfd(tcp, tcp->u_arg[0]);
 172         tprints(", ");
 173         printstr(tcp, tcp->u_arg[1], tcp->u_arg[2]);
 174         tprintf(", %lu, ", tcp->u_arg[2]);
 175         printllval(tcp, "%llu", PREAD_OFFSET_ARG);
 176
 177         return RVAL_DECODED;
 178 }
 179
 180 static void
 181 print_llu_from_low_high_val(struct tcb *tcp, int arg)
 182 {
 183 #if SIZEOF_LONG == SIZEOF_LONG_LONG
 184 # if SUPPORTED_PERSONALITIES > 1
 185         if (current_wordsize == sizeof(long))
 186 # endif
 187                 tprintf("%lu", (unsigned long) tcp->u_arg[arg]);
 188 # if SUPPORTED_PERSONALITIES > 1
 189         else
 190                 tprintf("%lu",
 191                         ((unsigned long) tcp->u_arg[arg + 1] << current_wordsize * 8)
 192                         | (unsigned long) tcp->u_arg[arg]);
 193 # endif
 194 #else
 195 # ifdef X32
 196         if (current_personality == 0)
 197                 tprintf("%llu", (unsigned long long) tcp->ext_arg[arg]);
 198         else
 199 # endif
 200         tprintf("%llu",
 201                 ((unsigned long long) (unsigned long) tcp->u_arg[arg + 1] << sizeof(long) * 8)
 202                 | (unsigned long long) (unsigned long) tcp->u_arg[arg]);
 203 #endif
 204 }
 205
 206 SYS_FUNC(preadv)
 207 {
 208         if (entering(tcp)) {
 209                 printfd(tcp, tcp->u_arg[0]);
 210                 tprints(", ");
 211         } else {
 212                 tprint_iov(tcp, tcp->u_arg[2], tcp->u_arg[1], 1);
 213                 tprintf(", %lu, ", tcp->u_arg[2]);
 214                 print_llu_from_low_high_val(tcp, 3);
 215         }
 216         return 0;
 217 }
 218
 219 SYS_FUNC(pwritev)
 220 {
 221         printfd(tcp, tcp->u_arg[0]);
 222         tprints(", ");
 223         tprint_iov(tcp, tcp->u_arg[2], tcp->u_arg[1], 1);
 224         tprintf(", %lu, ", tcp->u_arg[2]);
 225         print_llu_from_low_high_val(tcp, 3);
 226
 227         return RVAL_DECODED;
 228 }
 229
 230 #include "xlat/splice_flags.h"
 231
 232 SYS_FUNC(tee)
 233 {
 234         /* int fd_in */
 235         printfd(tcp, tcp->u_arg[0]);
 236         tprints(", ");
 237         /* int fd_out */
 238         printfd(tcp, tcp->u_arg[1]);
 239         tprints(", ");
 240         /* size_t len */
 241         tprintf("%lu, ", tcp->u_arg[2]);
 242         /* unsigned int flags */
 243         printflags(splice_flags, tcp->u_arg[3], "SPLICE_F_???");
 244
 245         return RVAL_DECODED;
 246 }
 247
 248 SYS_FUNC(splice)
 249 {
 250         /* int fd_in */
 251         printfd(tcp, tcp->u_arg[0]);
 252         tprints(", ");
 253         /* loff_t *off_in */
 254         printnum_int64(tcp, tcp->u_arg[1], "%" PRIu64);
 255         tprints(", ");
 256         /* int fd_out */
 257         printfd(tcp, tcp->u_arg[2]);
 258         tprints(", ");
 259         /* loff_t *off_out */
 260         printnum_int64(tcp, tcp->u_arg[3], "%" PRIu64);
 261         tprints(", ");
 262         /* size_t len */
 263         tprintf("%lu, ", tcp->u_arg[4]);
 264         /* unsigned int flags */
 265         printflags(splice_flags, tcp->u_arg[5], "SPLICE_F_???");
 266
 267         return RVAL_DECODED;
 268 }
 269
 270 SYS_FUNC(vmsplice)
 271 {
 272         /* int fd */
 273         printfd(tcp, tcp->u_arg[0]);
 274         tprints(", ");
 275         /* const struct iovec *iov, unsigned long nr_segs */
 276         tprint_iov(tcp, tcp->u_arg[2], tcp->u_arg[1], 1);
 277         tprintf(", %lu, ", tcp->u_arg[2]);
 278         /* unsigned int flags */
 279         printflags(splice_flags, tcp->u_arg[3], "SPLICE_F_???");
 280
 281         return RVAL_DECODED;
 282 }