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_ptr(tcp, tcp->u_arg[1]);
  40         return 0;
  41 }
  42
  43 SYS_FUNC(io_destroy)
  44 {
  45         printaddr(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(struct tcb *tcp, 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                 tprints(", resfd=");
  87                 printfd(tcp, cb->aio_resfd);
  88         }
  89         if (cb->aio_flags & ~IOCB_FLAG_RESFD)
  90                 tprintf(", flags=%x", cb->aio_flags);
  91 #endif
  92 }
  93
  94 static bool
  95 iocb_is_valid(const struct iocb *cb)
  96 {
  97         return cb->aio_buf == (unsigned long) cb->aio_buf &&
  98                cb->aio_nbytes == (size_t) cb->aio_nbytes &&
  99                (ssize_t) cb->aio_nbytes >= 0;
 100 }
 101
 102 static enum iocb_sub
 103 print_iocb_header(struct tcb *tcp, const struct iocb *cb)
 104 {
 105         enum iocb_sub sub;
 106
 107         if (cb->aio_data)
 108                 tprintf("data=%#" PRIx64 ", ",
 109                         (uint64_t) cb->aio_data);
 110
 111         if (cb->aio_key)
 112                 tprintf("key=%u, ", cb->aio_key);
 113
 114         sub = tprint_lio_opcode(cb->aio_lio_opcode);
 115         if (cb->aio_reqprio)
 116                 tprintf(", reqprio=%hd", cb->aio_reqprio);
 117
 118         tprints(", fildes=");
 119         printfd(tcp, cb->aio_fildes);
 120
 121         return sub;
 122 }
 123
 124 static void
 125 print_iocb(struct tcb *tcp, const struct iocb *cb)
 126 {
 127         enum iocb_sub sub = print_iocb_header(tcp, cb);
 128
 129         switch (sub) {
 130         case SUB_COMMON:
 131                 if (cb->aio_lio_opcode == 1 && iocb_is_valid(cb)) {
 132                         tprints(", str=");
 133                         printstr(tcp, (unsigned long) cb->aio_buf,
 134                                  (unsigned long) cb->aio_nbytes);
 135                 } else {
 136                         tprintf(", buf=%#" PRIx64, (uint64_t) cb->aio_buf);
 137                 }
 138                 tprintf(", nbytes=%" PRIu64 ", offset=%" PRId64,
 139                         (uint64_t) cb->aio_nbytes, (int64_t) cb->aio_offset);
 140                 print_common_flags(tcp, cb);
 141                 break;
 142         case SUB_VECTOR:
 143                 if (iocb_is_valid(cb)) {
 144                         tprints(", iovec=");
 145                         tprint_iov(tcp, cb->aio_nbytes, cb->aio_buf,
 146                                    cb->aio_lio_opcode == 8
 147                                    ? IOV_DECODE_STR
 148                                    : IOV_DECODE_ADDR);
 149                 } else {
 150                         tprintf(", buf=%#" PRIx64 ", nbytes=%" PRIu64,
 151                                 (uint64_t) cb->aio_buf,
 152                                 (uint64_t) cb->aio_nbytes);
 153                 }
 154                 tprintf(", offset=%" PRId64, (int64_t) cb->aio_offset);
 155                 print_common_flags(tcp, cb);
 156                 break;
 157         case SUB_NONE:
 158                 break;
 159         }
 160 }
 161
 162 static bool
 163 print_iocbp(struct tcb *tcp, void *elem_buf, size_t elem_size, void *data)
 164 {
 165         unsigned long addr;
 166         struct iocb cb;
 167
 168         if (elem_size < sizeof(long)) {
 169                 addr = * (unsigned int *) elem_buf;
 170         } else {
 171                 addr = * (unsigned long *) elem_buf;
 172         }
 173
 174         tprints("{");
 175         if (!umove_or_printaddr(tcp, addr, &cb))
 176                 print_iocb(tcp, &cb);
 177         tprints("}");
 178
 179         return true;
 180 }
 181
 182 SYS_FUNC(io_submit)
 183 {
 184         const long nr = widen_to_long(tcp->u_arg[1]);
 185         const unsigned long addr = tcp->u_arg[2];
 186         unsigned long iocbp;
 187
 188         printaddr(tcp->u_arg[0]);
 189         tprintf(", %ld, ", nr);
 190
 191         if (nr < 0)
 192                 printaddr(addr);
 193         else
 194                 print_array(tcp, addr, nr, &iocbp, current_wordsize,
 195                             umoven_or_printaddr, print_iocbp, 0);
 196
 197         return RVAL_DECODED;
 198 }
 199
 200 static bool
 201 print_io_event(struct tcb *tcp, void *elem_buf, size_t elem_size, void *data)
 202 {
 203         struct io_event *event = elem_buf;
 204
 205         tprintf("{data=%#" PRIx64 ", obj=%#" PRIx64
 206                 ", res=%" PRId64 ", res2=%" PRId64 "}",
 207                 (uint64_t) event->data, (uint64_t) event->obj,
 208                 (int64_t) event->res, (int64_t) event->res2);
 209
 210         return true;
 211 }
 212
 213 SYS_FUNC(io_cancel)
 214 {
 215         if (entering(tcp)) {
 216                 printaddr(tcp->u_arg[0]);
 217                 tprints(", ");
 218
 219                 struct iocb cb;
 220
 221                 if (!umove_or_printaddr(tcp, tcp->u_arg[1], &cb)) {
 222                         tprints("{");
 223                         print_iocb_header(tcp, &cb);
 224                         tprints("}");
 225                 }
 226                 tprints(", ");
 227         } else {
 228                 struct io_event event;
 229
 230                 if (!umove_or_printaddr(tcp, tcp->u_arg[2], &event))
 231                         print_io_event(tcp, &event, sizeof(event), 0);
 232         }
 233         return 0;
 234 }
 235
 236 SYS_FUNC(io_getevents)
 237 {
 238         if (entering(tcp)) {
 239                 printaddr(tcp->u_arg[0]);
 240                 tprintf(", %ld, %ld, ",
 241                         widen_to_long(tcp->u_arg[1]),
 242                         widen_to_long(tcp->u_arg[2]));
 243         } else {
 244                 struct io_event buf;
 245                 print_array(tcp, tcp->u_arg[3], tcp->u_rval, &buf, sizeof(buf),
 246                             umoven_or_printaddr, print_io_event, 0);
 247                 tprints(", ");
 248                 /*
 249                  * Since the timeout parameter is read by the kernel
 250                  * on entering syscall, it has to be decoded the same way
 251                  * whether the syscall has failed or not.
 252                  */
 253                 temporarily_clear_syserror(tcp);
 254                 print_timespec(tcp, tcp->u_arg[4]);
 255                 restore_cleared_syserror(tcp);
 256         }
 257         return 0;
 258 }