granicus.if.org Git - strace/blob - aio.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 <linux/aio_abi.h>
  33
  34 SYS_FUNC(io_setup)
  35 {
  36         if (entering(tcp))
  37                 tprintf("%u, ", (unsigned int) tcp->u_arg[0]);
  38         else
  39                 printnum_ulong(tcp, tcp->u_arg[1]);
  40         return 0;
  41 }
  42
  43 SYS_FUNC(io_destroy)
  44 {
  45         tprintf("%lu", tcp->u_arg[0]);
  46
  47         return RVAL_DECODED;
  48 }
  49
  50 enum iocb_sub {
  51         SUB_NONE, SUB_COMMON, SUB_VECTOR
  52 };
  53
  54 static enum iocb_sub
  55 tprint_lio_opcode(unsigned cmd)
  56 {
  57         static const struct {
  58                 const char *name;
  59                 enum iocb_sub sub;
  60         } cmds[] = {
  61                 { "pread", SUB_COMMON },
  62                 { "pwrite", SUB_COMMON },
  63                 { "fsync", SUB_NONE },
  64                 { "fdsync", SUB_NONE },
  65                 { "preadx", SUB_NONE },
  66                 { "poll", SUB_NONE },
  67                 { "noop", SUB_NONE },
  68                 { "preadv", SUB_VECTOR },
  69                 { "pwritev", SUB_VECTOR },
  70         };
  71
  72         if (cmd < ARRAY_SIZE(cmds)) {
  73                 tprints(cmds[cmd].name);
  74                 return cmds[cmd].sub;
  75         }
  76         tprintf("%u /* SUB_??? */", cmd);
  77         return SUB_NONE;
  78 }
  79
  80 static void
  81 print_common_flags(const struct iocb *cb)
  82 {
  83 /* IOCB_FLAG_RESFD is available since v2.6.22-rc1~47 */
  84 #ifdef IOCB_FLAG_RESFD
  85         if (cb->aio_flags & IOCB_FLAG_RESFD)
  86                 tprintf(", resfd=%d", cb->aio_resfd);
  87         if (cb->aio_flags & ~IOCB_FLAG_RESFD)
  88                 tprintf(", flags=%x", cb->aio_flags);
  89 #endif
  90 }
  91
  92 static bool
  93 iocb_is_valid(const struct iocb *cb)
  94 {
  95         return cb->aio_buf == (unsigned long) cb->aio_buf &&
  96                cb->aio_nbytes == (size_t) cb->aio_nbytes &&
  97                (ssize_t) cb->aio_nbytes >= 0;
  98 }
  99
 100 static enum iocb_sub
 101 print_iocb_header(const struct iocb *cb)
 102 {
 103         enum iocb_sub sub;
 104
 105         if (cb->aio_data)
 106                 tprintf("data=%#" PRIx64 ", ",
 107                         (uint64_t) cb->aio_data);
 108
 109         if (cb->aio_key)
 110                 tprintf("key=%u, ", cb->aio_key);
 111
 112         sub = tprint_lio_opcode(cb->aio_lio_opcode);
 113         if (cb->aio_reqprio)
 114                 tprintf(", reqprio=%hd", cb->aio_reqprio);
 115
 116         tprintf(", fildes=%d", cb->aio_fildes);
 117
 118         return sub;
 119 }
 120
 121 static void
 122 print_iocb(struct tcb *tcp, const struct iocb *cb)
 123 {
 124         enum iocb_sub sub = print_iocb_header(cb);
 125
 126         switch (sub) {
 127         case SUB_COMMON:
 128                 if (cb->aio_lio_opcode == 1 && iocb_is_valid(cb)) {
 129                         tprints(", str=");
 130                         printstr(tcp, (unsigned long) cb->aio_buf,
 131                                  (unsigned long) cb->aio_nbytes);
 132                 } else {
 133                         tprintf(", buf=%#" PRIx64, (uint64_t) cb->aio_buf);
 134                 }
 135                 tprintf(", nbytes=%" PRIu64 ", offset=%" PRId64,
 136                         (uint64_t) cb->aio_nbytes, (int64_t) cb->aio_offset);
 137                 print_common_flags(cb);
 138                 break;
 139         case SUB_VECTOR:
 140                 if (iocb_is_valid(cb)) {
 141                         tprints(", iovec=");
 142                         tprint_iov(tcp, cb->aio_nbytes, cb->aio_buf,
 143                                    cb->aio_lio_opcode == 8);
 144                 } else {
 145                         tprintf(", buf=%#" PRIx64 ", nbytes=%" PRIu64,
 146                                 (uint64_t) cb->aio_buf,
 147                                 (uint64_t) cb->aio_nbytes);
 148                 }
 149                 tprintf(", offset=%" PRId64, (int64_t) cb->aio_offset);
 150                 print_common_flags(cb);
 151                 break;
 152         case SUB_NONE:
 153                 break;
 154         }
 155 }
 156
 157 SYS_FUNC(io_submit)
 158 {
 159         long nr = tcp->u_arg[1];
 160         /* if nr <= 0, we end up printing just "[]" */
 161         tprintf("%lu, %ld, [", tcp->u_arg[0], nr);
 162         {
 163                 long i;
 164                 long iocbs = tcp->u_arg[2];
 165
 166                 for (i = 0; i < nr; ++i, iocbs += current_wordsize) {
 167                         unsigned long iocbp;
 168                         struct iocb cb;
 169
 170                         if (i)
 171                                 tprints(", ");
 172
 173                         if (umove_ulong_or_printaddr(tcp, iocbs, &iocbp)) {
 174                                 /*
 175                                  * No point in trying to read the whole array
 176                                  * because nr can be ridiculously large.
 177                                  */
 178                                 break;
 179                         }
 180
 181                         tprints("{");
 182                         if (!umove_or_printaddr(tcp, iocbp, &cb))
 183                                 print_iocb(tcp, &cb);
 184                         tprints("}");
 185                 }
 186         }
 187         tprints("]");
 188         return RVAL_DECODED;
 189 }
 190
 191 static int
 192 print_io_event(struct tcb *tcp, const long addr)
 193 {
 194         struct io_event event;
 195
 196         if (umove_or_printaddr(tcp, addr, &event))
 197                 return -1;
 198         tprintf("{data=%#" PRIx64 ", obj=%#" PRIx64
 199                 ", res=%" PRId64 ", res2=%" PRId64 "}",
 200                 (uint64_t) event.data, (uint64_t) event.obj,
 201                 (int64_t) event.res, (int64_t) event.res2);
 202         return 0;
 203 }
 204
 205 SYS_FUNC(io_cancel)
 206 {
 207         if (entering(tcp)) {
 208                 tprintf("%lu, ", tcp->u_arg[0]);
 209                 struct iocb cb;
 210
 211                 if (!umove_or_printaddr(tcp, tcp->u_arg[1], &cb)) {
 212                         tprints("{");
 213                         print_iocb_header(&cb);
 214                         tprints("}");
 215                 }
 216                 tprints(", ");
 217         } else {
 218                 print_io_event(tcp, tcp->u_arg[2]);
 219         }
 220         return 0;
 221 }
 222
 223 SYS_FUNC(io_getevents)
 224 {
 225         if (entering(tcp)) {
 226                 tprintf("%lu, %ld, %ld, ",
 227                         tcp->u_arg[0], tcp->u_arg[1], tcp->u_arg[2]);
 228         } else {
 229                 if (tcp->u_rval == 0) {
 230                         tprints("[]");
 231                 } else {
 232                         struct io_event *events = (void *)tcp->u_arg[3];
 233                         long i, nr = tcp->u_rval;
 234
 235                         for (i = 0; i < nr; i++, events++) {
 236                                 if (i == 0)
 237                                         tprints("[");
 238                                 else
 239                                         tprints(", ");
 240
 241                                 if (print_io_event(tcp, (long)events))
 242                                         break;
 243                         }
 244                         tprints("], ");
 245                 }
 246
 247                 /*
 248                  * Since the timeout parameter is read by the kernel
 249                  * on entering syscall, it has to be decoded the same way
 250                  * whether the syscall has failed or not.
 251                  */
 252                 temporarily_clear_syserror(tcp);
 253                 print_timespec(tcp, tcp->u_arg[4]);
 254                 restore_cleared_syserror(tcp);
 255         }
 256         return 0;
 257 }