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 #if HAVE_SYS_UIO_H
  34 # include <sys/uio.h>
  35 #endif
  36
  37 int
  38 sys_read(struct tcb *tcp)
  39 {
  40         if (entering(tcp)) {
  41                 printfd(tcp, tcp->u_arg[0]);
  42                 tprints(", ");
  43         } else {
  44                 if (syserror(tcp))
  45                         tprintf("%#lx", tcp->u_arg[1]);
  46                 else
  47                         printstr(tcp, tcp->u_arg[1], tcp->u_rval);
  48                 tprintf(", %lu", tcp->u_arg[2]);
  49         }
  50         return 0;
  51 }
  52
  53 int
  54 sys_write(struct tcb *tcp)
  55 {
  56         if (entering(tcp)) {
  57                 printfd(tcp, tcp->u_arg[0]);
  58                 tprints(", ");
  59                 printstr(tcp, tcp->u_arg[1], tcp->u_arg[2]);
  60                 tprintf(", %lu", tcp->u_arg[2]);
  61         }
  62         return 0;
  63 }
  64
  65 #if HAVE_SYS_UIO_H
  66 void
  67 tprint_iov(struct tcb *tcp, unsigned long len, unsigned long addr, int decode_iov)
  68 {
  69 #if SUPPORTED_PERSONALITIES > 1
  70         union {
  71                 struct { u_int32_t base; u_int32_t len; } iov32;
  72                 struct { u_int64_t base; u_int64_t len; } iov64;
  73         } iov;
  74 #define sizeof_iov \
  75         (current_wordsize == 4 ? sizeof(iov.iov32) : sizeof(iov.iov64))
  76 #define iov_iov_base \
  77         (current_wordsize == 4 ? (uint64_t) iov.iov32.base : iov.iov64.base)
  78 #define iov_iov_len \
  79         (current_wordsize == 4 ? (uint64_t) iov.iov32.len : iov.iov64.len)
  80 #else
  81         struct iovec iov;
  82 #define sizeof_iov sizeof(iov)
  83 #define iov_iov_base iov.iov_base
  84 #define iov_iov_len iov.iov_len
  85 #endif
  86         unsigned long size, cur, end, abbrev_end;
  87         int failed = 0;
  88
  89         if (!len) {
  90                 tprints("[]");
  91                 return;
  92         }
  93         size = len * sizeof_iov;
  94         end = addr + size;
  95         if (!verbose(tcp) || size / sizeof_iov != len || end < addr) {
  96                 tprintf("%#lx", addr);
  97                 return;
  98         }
  99         if (abbrev(tcp)) {
 100                 abbrev_end = addr + max_strlen * sizeof_iov;
 101                 if (abbrev_end < addr)
 102                         abbrev_end = end;
 103         } else {
 104                 abbrev_end = end;
 105         }
 106         tprints("[");
 107         for (cur = addr; cur < end; cur += sizeof_iov) {
 108                 if (cur > addr)
 109                         tprints(", ");
 110                 if (cur >= abbrev_end) {
 111                         tprints("...");
 112                         break;
 113                 }
 114                 if (umoven(tcp, cur, sizeof_iov, (char *) &iov) < 0) {
 115                         tprints("?");
 116                         failed = 1;
 117                         break;
 118                 }
 119                 tprints("{");
 120                 if (decode_iov)
 121                         printstr(tcp, (long) iov_iov_base, iov_iov_len);
 122                 else
 123                         tprintf("%#lx", (long) iov_iov_base);
 124                 tprintf(", %lu}", (unsigned long)iov_iov_len);
 125         }
 126         tprints("]");
 127         if (failed)
 128                 tprintf(" %#lx", addr);
 129 #undef sizeof_iov
 130 #undef iov_iov_base
 131 #undef iov_iov_len
 132 }
 133
 134 int
 135 sys_readv(struct tcb *tcp)
 136 {
 137         if (entering(tcp)) {
 138                 printfd(tcp, tcp->u_arg[0]);
 139                 tprints(", ");
 140         } else {
 141                 if (syserror(tcp)) {
 142                         tprintf("%#lx, %lu",
 143                                         tcp->u_arg[1], tcp->u_arg[2]);
 144                         return 0;
 145                 }
 146                 tprint_iov(tcp, tcp->u_arg[2], tcp->u_arg[1], 1);
 147                 tprintf(", %lu", tcp->u_arg[2]);
 148         }
 149         return 0;
 150 }
 151
 152 int
 153 sys_writev(struct tcb *tcp)
 154 {
 155         if (entering(tcp)) {
 156                 printfd(tcp, tcp->u_arg[0]);
 157                 tprints(", ");
 158                 tprint_iov(tcp, tcp->u_arg[2], tcp->u_arg[1], 1);
 159                 tprintf(", %lu", tcp->u_arg[2]);
 160         }
 161         return 0;
 162 }
 163 #endif
 164
 165 /* The SH4 ABI does allow long longs in odd-numbered registers, but
 166    does not allow them to be split between registers and memory - and
 167    there are only four argument registers for normal functions.  As a
 168    result pread takes an extra padding argument before the offset.  This
 169    was changed late in the 2.4 series (around 2.4.20).  */
 170 #if defined(SH)
 171 #define PREAD_OFFSET_ARG 4
 172 #else
 173 #define PREAD_OFFSET_ARG 3
 174 #endif
 175
 176 int
 177 sys_pread(struct tcb *tcp)
 178 {
 179         if (entering(tcp)) {
 180                 printfd(tcp, tcp->u_arg[0]);
 181                 tprints(", ");
 182         } else {
 183                 if (syserror(tcp))
 184                         tprintf("%#lx", tcp->u_arg[1]);
 185                 else
 186                         printstr(tcp, tcp->u_arg[1], tcp->u_rval);
 187                 tprintf(", %lu, ", tcp->u_arg[2]);
 188                 printllval(tcp, "%llu", PREAD_OFFSET_ARG);
 189         }
 190         return 0;
 191 }
 192
 193 int
 194 sys_pwrite(struct tcb *tcp)
 195 {
 196         if (entering(tcp)) {
 197                 printfd(tcp, tcp->u_arg[0]);
 198                 tprints(", ");
 199                 printstr(tcp, tcp->u_arg[1], tcp->u_arg[2]);
 200                 tprintf(", %lu, ", tcp->u_arg[2]);
 201                 printllval(tcp, "%llu", PREAD_OFFSET_ARG);
 202         }
 203         return 0;
 204 }
 205
 206 #if HAVE_SYS_UIO_H
 207 int
 208 sys_preadv(struct tcb *tcp)
 209 {
 210         if (entering(tcp)) {
 211                 printfd(tcp, tcp->u_arg[0]);
 212                 tprints(", ");
 213         } else {
 214                 if (syserror(tcp)) {
 215                         tprintf("%#lx, %lu", tcp->u_arg[1], tcp->u_arg[2]);
 216                         return 0;
 217                 }
 218                 tprint_iov(tcp, tcp->u_arg[2], tcp->u_arg[1], 1);
 219                 tprintf(", %lu, ", tcp->u_arg[2]);
 220                 printllval(tcp, "%llu", PREAD_OFFSET_ARG);
 221         }
 222         return 0;
 223 }
 224
 225 int
 226 sys_pwritev(struct tcb *tcp)
 227 {
 228         if (entering(tcp)) {
 229                 printfd(tcp, tcp->u_arg[0]);
 230                 tprints(", ");
 231                 tprint_iov(tcp, tcp->u_arg[2], tcp->u_arg[1], 1);
 232                 tprintf(", %lu, ", tcp->u_arg[2]);
 233                 printllval(tcp, "%llu", PREAD_OFFSET_ARG);
 234         }
 235         return 0;
 236 }
 237 #endif /* HAVE_SYS_UIO_H */
 238
 239 int
 240 sys_sendfile(struct tcb *tcp)
 241 {
 242         if (entering(tcp)) {
 243                 off_t offset;
 244
 245                 printfd(tcp, tcp->u_arg[0]);
 246                 tprints(", ");
 247                 printfd(tcp, tcp->u_arg[1]);
 248                 tprints(", ");
 249                 if (!tcp->u_arg[2])
 250                         tprints("NULL");
 251                 else if (umove(tcp, tcp->u_arg[2], &offset) < 0)
 252                         tprintf("%#lx", tcp->u_arg[2]);
 253                 else
 254 #ifdef HAVE_LONG_LONG_OFF_T
 255                         tprintf("[%llu]", offset);
 256 #else
 257                         tprintf("[%lu]", offset);
 258 #endif
 259                 tprintf(", %lu", tcp->u_arg[3]);
 260         }
 261         return 0;
 262 }
 263
 264 static void
 265 print_loff_t(struct tcb *tcp, long addr)
 266 {
 267         loff_t offset;
 268
 269         if (!addr)
 270                 tprints("NULL");
 271         else if (umove(tcp, addr, &offset) < 0)
 272                 tprintf("%#lx", addr);
 273         else
 274                 tprintf("[%llu]", (unsigned long long int) offset);
 275 }
 276
 277 int
 278 sys_sendfile64(struct tcb *tcp)
 279 {
 280         if (entering(tcp)) {
 281                 printfd(tcp, tcp->u_arg[0]);
 282                 tprints(", ");
 283                 printfd(tcp, tcp->u_arg[1]);
 284                 tprints(", ");
 285                 print_loff_t(tcp, tcp->u_arg[2]);
 286                 tprintf(", %lu", tcp->u_arg[3]);
 287         }
 288         return 0;
 289 }
 290
 291 static const struct xlat splice_flags[] = {
 292 #ifdef SPLICE_F_MOVE
 293         { SPLICE_F_MOVE,     "SPLICE_F_MOVE"     },
 294 #endif
 295 #ifdef SPLICE_F_NONBLOCK
 296         { SPLICE_F_NONBLOCK, "SPLICE_F_NONBLOCK" },
 297 #endif
 298 #ifdef SPLICE_F_MORE
 299         { SPLICE_F_MORE,     "SPLICE_F_MORE"     },
 300 #endif
 301 #ifdef SPLICE_F_GIFT
 302         { SPLICE_F_GIFT,     "SPLICE_F_GIFT"     },
 303 #endif
 304         { 0,                 NULL                },
 305 };
 306
 307 int
 308 sys_tee(struct tcb *tcp)
 309 {
 310         if (entering(tcp)) {
 311                 /* int fd_in */
 312                 printfd(tcp, tcp->u_arg[0]);
 313                 tprints(", ");
 314                 /* int fd_out */
 315                 printfd(tcp, tcp->u_arg[1]);
 316                 tprints(", ");
 317                 /* size_t len */
 318                 tprintf("%lu, ", tcp->u_arg[2]);
 319                 /* unsigned int flags */
 320                 printflags(splice_flags, tcp->u_arg[3], "SPLICE_F_???");
 321         }
 322         return 0;
 323 }
 324
 325 int
 326 sys_splice(struct tcb *tcp)
 327 {
 328         if (entering(tcp)) {
 329                 /* int fd_in */
 330                 printfd(tcp, tcp->u_arg[0]);
 331                 tprints(", ");
 332                 /* loff_t *off_in */
 333                 print_loff_t(tcp, tcp->u_arg[1]);
 334                 tprints(", ");
 335                 /* int fd_out */
 336                 printfd(tcp, tcp->u_arg[2]);
 337                 tprints(", ");
 338                 /* loff_t *off_out */
 339                 print_loff_t(tcp, tcp->u_arg[3]);
 340                 tprints(", ");
 341                 /* size_t len */
 342                 tprintf("%lu, ", tcp->u_arg[4]);
 343                 /* unsigned int flags */
 344                 printflags(splice_flags, tcp->u_arg[5], "SPLICE_F_???");
 345         }
 346         return 0;
 347 }
 348
 349 int
 350 sys_vmsplice(struct tcb *tcp)
 351 {
 352         if (entering(tcp)) {
 353                 /* int fd */
 354                 printfd(tcp, tcp->u_arg[0]);
 355                 tprints(", ");
 356                 /* const struct iovec *iov, unsigned long nr_segs */
 357                 tprint_iov(tcp, tcp->u_arg[2], tcp->u_arg[1], 1);
 358                 tprintf(", %lu, ", tcp->u_arg[2]);
 359                 /* unsigned int flags */
 360                 printflags(splice_flags, tcp->u_arg[3], "SPLICE_F_???");
 361         }
 362         return 0;
 363 }
 364
 365 int
 366 sys_ioctl(struct tcb *tcp)
 367 {
 368         const struct ioctlent *iop;
 369
 370         if (entering(tcp)) {
 371                 printfd(tcp, tcp->u_arg[0]);
 372                 tprints(", ");
 373                 iop = ioctl_lookup(tcp->u_arg[1]);
 374                 if (iop) {
 375                         tprints(iop->symbol);
 376                         while ((iop = ioctl_next_match(iop)))
 377                                 tprintf(" or %s", iop->symbol);
 378                 } else
 379                         tprintf("%#lx", tcp->u_arg[1]);
 380                 ioctl_decode(tcp, tcp->u_arg[1], tcp->u_arg[2]);
 381         }
 382         else {
 383                 int ret = ioctl_decode(tcp, tcp->u_arg[1], tcp->u_arg[2]);
 384                 if (!ret)
 385                         tprintf(", %#lx", tcp->u_arg[2]);
 386                 else
 387                         return ret - 1;
 388         }
 389         return 0;
 390 }