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                         if (c->data_size != -1UL)
  89                                 c->data_size -= len;
  90                         printstr(tcp, iov[0], len);
  91                         break;
  92                 case IOV_DECODE_NETLINK:
  93                         if (len > c->data_size)
  94                                 len = c->data_size;
  95                         if (c->data_size != -1UL)
  96                                 c->data_size -= len;
  97                         decode_netlink(tcp, iov[0], iov[1]);
  98                         break;
  99                 default:
 100                         printaddr(iov[0]);
 101                         break;
 102         }
 103
 104         tprintf(", iov_len=%lu}", iov[1]);
 105
 106         return true;
 107 }
 108
 109 /*
 110  * data_size limits the cumulative size of printed data.
 111  * Example: recvmsg returing a short read.
 112  */
 113 void
 114 tprint_iov_upto(struct tcb *tcp, unsigned long len, unsigned long addr,
 115                 enum iov_decode decode_iov, unsigned long data_size)
 116 {
 117         unsigned long iov[2];
 118         struct print_iovec_config config =
 119                 { .decode_iov = decode_iov, .data_size = data_size };
 120
 121         print_array(tcp, addr, len, iov, current_wordsize * 2,
 122                     umoven_or_printaddr_ignore_syserror, print_iovec, &config);
 123 }
 124
 125 SYS_FUNC(readv)
 126 {
 127         if (entering(tcp)) {
 128                 printfd(tcp, tcp->u_arg[0]);
 129                 tprints(", ");
 130         } else {
 131                 tprint_iov_upto(tcp, tcp->u_arg[2], tcp->u_arg[1],
 132                                 syserror(tcp) ? IOV_DECODE_ADDR :
 133                                 IOV_DECODE_STR, tcp->u_rval);
 134                 tprintf(", %lu", tcp->u_arg[2]);
 135         }
 136         return 0;
 137 }
 138
 139 SYS_FUNC(writev)
 140 {
 141         printfd(tcp, tcp->u_arg[0]);
 142         tprints(", ");
 143         tprint_iov(tcp, tcp->u_arg[2], tcp->u_arg[1], IOV_DECODE_STR);
 144         tprintf(", %lu", tcp->u_arg[2]);
 145
 146         return RVAL_DECODED;
 147 }
 148
 149 SYS_FUNC(pread)
 150 {
 151         if (entering(tcp)) {
 152                 printfd(tcp, tcp->u_arg[0]);
 153                 tprints(", ");
 154         } else {
 155                 if (syserror(tcp))
 156                         printaddr(tcp->u_arg[1]);
 157                 else
 158                         printstr(tcp, tcp->u_arg[1], tcp->u_rval);
 159                 tprintf(", %lu, ", tcp->u_arg[2]);
 160                 printllval(tcp, "%lld", 3);
 161         }
 162         return 0;
 163 }
 164
 165 SYS_FUNC(pwrite)
 166 {
 167         printfd(tcp, tcp->u_arg[0]);
 168         tprints(", ");
 169         printstr(tcp, tcp->u_arg[1], tcp->u_arg[2]);
 170         tprintf(", %lu, ", tcp->u_arg[2]);
 171         printllval(tcp, "%lld", 3);
 172
 173         return RVAL_DECODED;
 174 }
 175
 176 static void
 177 print_lld_from_low_high_val(struct tcb *tcp, int arg)
 178 {
 179 #if SIZEOF_LONG > 4 && SIZEOF_LONG == SIZEOF_LONG_LONG
 180 # ifndef current_klongsize
 181         if (current_klongsize < SIZEOF_LONG) {
 182                 tprintf("%ld", (tcp->u_arg[arg + 1] << current_wordsize * 8)
 183                                | tcp->u_arg[arg]);
 184         } else
 185 # endif /* !current_klongsize */
 186         {
 187                 tprintf("%ld", tcp->u_arg[arg]);
 188         }
 189 #elif SIZEOF_LONG > 4
 190 # error Unsupported configuration: SIZEOF_LONG > 4 && SIZEOF_LONG_LONG > SIZEOF_LONG
 191 #elif HAVE_STRUCT_TCB_EXT_ARG
 192 # ifndef current_klongsize
 193         if (current_klongsize < SIZEOF_LONG_LONG) {
 194                 tprintf("%lld",
 195                         (zero_extend_signed_to_ull(tcp->u_arg[arg + 1]) << sizeof(long) * 8)
 196                         | zero_extend_signed_to_ull(tcp->u_arg[arg]));
 197         } else
 198 # endif /* !current_klongsize */
 199         {
 200                 tprintf("%lld", tcp->ext_arg[arg]);
 201         }
 202 #else /* SIZEOF_LONG_LONG > SIZEOF_LONG && !HAVE_STRUCT_TCB_EXT_ARG */
 203         tprintf("%lld",
 204                 (zero_extend_signed_to_ull(tcp->u_arg[arg + 1]) << sizeof(long) * 8)
 205                 | zero_extend_signed_to_ull(tcp->u_arg[arg]));
 206 #endif
 207 }
 208
 209 #include "xlat/rwf_flags.h"
 210
 211 static int
 212 do_preadv(struct tcb *tcp, const int flags_arg)
 213 {
 214         if (entering(tcp)) {
 215                 printfd(tcp, tcp->u_arg[0]);
 216                 tprints(", ");
 217         } else {
 218                 unsigned long len = widen_to_ulong(tcp->u_arg[2]);
 219
 220                 tprint_iov_upto(tcp, len, tcp->u_arg[1],
 221                                 syserror(tcp) ? IOV_DECODE_ADDR :
 222                                 IOV_DECODE_STR, tcp->u_rval);
 223                 tprintf(", %lu, ", len);
 224                 print_lld_from_low_high_val(tcp, 3);
 225                 if (flags_arg >= 0) {
 226                         tprints(", ");
 227                         printflags(rwf_flags, tcp->u_arg[flags_arg], "RWF_???");
 228                 }
 229         }
 230         return 0;
 231 }
 232
 233 SYS_FUNC(preadv)
 234 {
 235         return do_preadv(tcp, -1);
 236 }
 237
 238 SYS_FUNC(preadv2)
 239 {
 240         return do_preadv(tcp, 5);
 241 }
 242
 243 static int
 244 do_pwritev(struct tcb *tcp, const int flags_arg)
 245 {
 246         unsigned long len = widen_to_ulong(tcp->u_arg[2]);
 247
 248         printfd(tcp, tcp->u_arg[0]);
 249         tprints(", ");
 250         tprint_iov(tcp, len, tcp->u_arg[1], IOV_DECODE_STR);
 251         tprintf(", %lu, ", len);
 252         print_lld_from_low_high_val(tcp, 3);
 253         if (flags_arg >= 0) {
 254                 tprints(", ");
 255                 printflags(rwf_flags, tcp->u_arg[flags_arg], "RWF_???");
 256         }
 257
 258         return RVAL_DECODED;
 259 }
 260
 261 SYS_FUNC(pwritev)
 262 {
 263         return do_pwritev(tcp, -1);
 264 }
 265
 266 SYS_FUNC(pwritev2)
 267 {
 268         return do_pwritev(tcp, 5);
 269 }
 270
 271 #include "xlat/splice_flags.h"
 272
 273 SYS_FUNC(tee)
 274 {
 275         /* int fd_in */
 276         printfd(tcp, tcp->u_arg[0]);
 277         tprints(", ");
 278         /* int fd_out */
 279         printfd(tcp, tcp->u_arg[1]);
 280         tprints(", ");
 281         /* size_t len */
 282         tprintf("%lu, ", tcp->u_arg[2]);
 283         /* unsigned int flags */
 284         printflags(splice_flags, tcp->u_arg[3], "SPLICE_F_???");
 285
 286         return RVAL_DECODED;
 287 }
 288
 289 SYS_FUNC(splice)
 290 {
 291         /* int fd_in */
 292         printfd(tcp, tcp->u_arg[0]);
 293         tprints(", ");
 294         /* loff_t *off_in */
 295         printnum_int64(tcp, tcp->u_arg[1], "%" PRId64);
 296         tprints(", ");
 297         /* int fd_out */
 298         printfd(tcp, tcp->u_arg[2]);
 299         tprints(", ");
 300         /* loff_t *off_out */
 301         printnum_int64(tcp, tcp->u_arg[3], "%" PRId64);
 302         tprints(", ");
 303         /* size_t len */
 304         tprintf("%lu, ", tcp->u_arg[4]);
 305         /* unsigned int flags */
 306         printflags(splice_flags, tcp->u_arg[5], "SPLICE_F_???");
 307
 308         return RVAL_DECODED;
 309 }
 310
 311 SYS_FUNC(vmsplice)
 312 {
 313         /* int fd */
 314         printfd(tcp, tcp->u_arg[0]);
 315         tprints(", ");
 316         /* const struct iovec *iov, unsigned long nr_segs */
 317         tprint_iov(tcp, tcp->u_arg[2], tcp->u_arg[1], IOV_DECODE_STR);
 318         tprintf(", %lu, ", tcp->u_arg[2]);
 319         /* unsigned int flags */
 320         printflags(splice_flags, tcp->u_arg[3], "SPLICE_F_???");
 321
 322         return RVAL_DECODED;
 323 }