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  * Copyright (c) 1999-2018 The strace developers.
   7  * All rights reserved.
   8  *
   9  * Redistribution and use in source and binary forms, with or without
  10  * modification, are permitted provided that the following conditions
  11  * are met:
  12  * 1. Redistributions of source code must retain the above copyright
  13  *    notice, this list of conditions and the following disclaimer.
  14  * 2. Redistributions in binary form must reproduce the above copyright
  15  *    notice, this list of conditions and the following disclaimer in the
  16  *    documentation and/or other materials provided with the distribution.
  17  * 3. The name of the author may not be used to endorse or promote products
  18  *    derived from this software without specific prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  21  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  22  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  23  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  24  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  25  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  26  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  27  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  28  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  29  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  30  */
  31
  32 #include "defs.h"
  33 #include "print_fields.h"
  34 #include <linux/aio_abi.h>
  35
  36 #include "xlat/aio_cmds.h"
  37
  38 SYS_FUNC(io_setup)
  39 {
  40         if (entering(tcp))
  41                 tprintf("%u, ", (unsigned int) tcp->u_arg[0]);
  42         else
  43                 printnum_ptr(tcp, tcp->u_arg[1]);
  44         return 0;
  45 }
  46
  47 SYS_FUNC(io_destroy)
  48 {
  49         printaddr(tcp->u_arg[0]);
  50
  51         return RVAL_DECODED;
  52 }
  53
  54 enum iocb_sub {
  55         SUB_NONE, SUB_COMMON, SUB_VECTOR
  56 };
  57
  58 static enum iocb_sub
  59 tprint_lio_opcode(unsigned int cmd)
  60 {
  61         static const enum iocb_sub subs[] = {
  62                 [IOCB_CMD_PREAD]        = SUB_COMMON,
  63                 [IOCB_CMD_PWRITE]       = SUB_COMMON,
  64                 [IOCB_CMD_FSYNC]        = SUB_NONE,
  65                 [IOCB_CMD_FDSYNC]       = SUB_NONE,
  66                 [IOCB_CMD_PREADX]       = SUB_NONE,
  67                 [IOCB_CMD_POLL]         = SUB_NONE,
  68                 [IOCB_CMD_NOOP]         = SUB_NONE,
  69                 [IOCB_CMD_PREADV]       = SUB_VECTOR,
  70                 [IOCB_CMD_PWRITEV]      = SUB_VECTOR,
  71         };
  72
  73         printxval_indexn_ex(ARRSZ_PAIR(aio_cmds), cmd, "IOCB_CMD_???",
  74                             XLAT_STYLE_FMT_U);
  75
  76         return cmd < ARRAY_SIZE(subs) ? subs[cmd] : SUB_NONE;
  77 }
  78
  79 static void
  80 print_common_flags(struct tcb *tcp, const struct iocb *cb)
  81 {
  82 /* IOCB_FLAG_RESFD is available since v2.6.22-rc1~47 */
  83 #ifdef IOCB_FLAG_RESFD
  84         if (cb->aio_flags & IOCB_FLAG_RESFD)
  85                 PRINT_FIELD_FD(", ", *cb, aio_resfd, tcp);
  86
  87         if (cb->aio_flags & ~IOCB_FLAG_RESFD)
  88                 PRINT_FIELD_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(struct tcb *tcp, const struct iocb *cb)
 102 {
 103         enum iocb_sub sub;
 104
 105         if (cb->aio_data){
 106                 PRINT_FIELD_X("", *cb, aio_data);
 107                 tprints(", ");
 108         }
 109
 110         if (cb->aio_key) {
 111                 PRINT_FIELD_U("", *cb, aio_key);
 112                 tprints(", ");
 113         }
 114
 115         tprints("aio_lio_opcode=");
 116         sub = tprint_lio_opcode(cb->aio_lio_opcode);
 117         if (cb->aio_reqprio)
 118                 PRINT_FIELD_D(", ", *cb, aio_reqprio);
 119
 120         PRINT_FIELD_FD(", ", *cb, aio_fildes, tcp);
 121
 122         return sub;
 123 }
 124
 125 static void
 126 print_iocb(struct tcb *tcp, const struct iocb *cb)
 127 {
 128         tprints("{");
 129
 130         enum iocb_sub sub = print_iocb_header(tcp, cb);
 131
 132         switch (sub) {
 133         case SUB_COMMON:
 134                 if (cb->aio_lio_opcode == 1 && iocb_is_valid(cb)) {
 135                         PRINT_FIELD_STRN(", ", *cb, aio_buf,
 136                                          cb->aio_nbytes, tcp);
 137                 } else {
 138                         PRINT_FIELD_X(", ", *cb, aio_buf);
 139                 }
 140                 PRINT_FIELD_U(", ", *cb, aio_nbytes);
 141                 PRINT_FIELD_D(", ", *cb, aio_offset);
 142                 print_common_flags(tcp, cb);
 143                 break;
 144         case SUB_VECTOR:
 145                 if (iocb_is_valid(cb)) {
 146                         tprints(", aio_buf=");
 147                         tprint_iov(tcp, cb->aio_nbytes, cb->aio_buf,
 148                                    cb->aio_lio_opcode == 8
 149                                    ? IOV_DECODE_STR
 150                                    : IOV_DECODE_ADDR);
 151                 } else {
 152                         PRINT_FIELD_X(", ", *cb, aio_buf);
 153                         PRINT_FIELD_U(", ", *cb, aio_nbytes);
 154                 }
 155                 PRINT_FIELD_D(", ", *cb, aio_offset);
 156                 print_common_flags(tcp, cb);
 157                 break;
 158         case SUB_NONE:
 159                 break;
 160         }
 161
 162         tprints("}");
 163 }
 164
 165 static bool
 166 print_iocbp(struct tcb *tcp, void *elem_buf, size_t elem_size, void *data)
 167 {
 168         kernel_ulong_t addr;
 169         struct iocb cb;
 170
 171         if (elem_size < sizeof(kernel_ulong_t)) {
 172                 addr = *(unsigned int *) elem_buf;
 173         } else {
 174                 addr = *(kernel_ulong_t *) elem_buf;
 175         }
 176
 177         if (!umove_or_printaddr(tcp, addr, &cb))
 178                 print_iocb(tcp, &cb);
 179
 180         return true;
 181 }
 182
 183 SYS_FUNC(io_submit)
 184 {
 185         const kernel_long_t nr =
 186                 truncate_klong_to_current_wordsize(tcp->u_arg[1]);
 187         const kernel_ulong_t addr = tcp->u_arg[2];
 188         kernel_ulong_t iocbp;
 189
 190         printaddr(tcp->u_arg[0]);
 191         tprintf(", %" PRI_kld ", ", nr);
 192
 193         if (nr < 0)
 194                 printaddr(addr);
 195         else
 196                 print_array(tcp, addr, nr, &iocbp, current_wordsize,
 197                             tfetch_mem, print_iocbp, 0);
 198
 199         return RVAL_DECODED;
 200 }
 201
 202 static bool
 203 print_io_event(struct tcb *tcp, void *elem_buf, size_t elem_size, void *data)
 204 {
 205         struct io_event *event = elem_buf;
 206
 207         PRINT_FIELD_X("{", *event, data);
 208         PRINT_FIELD_X(", ", *event, obj);
 209         PRINT_FIELD_D(", ", *event, res);
 210         PRINT_FIELD_D(", ", *event, res2);
 211         tprints("}");
 212
 213         return true;
 214 }
 215
 216 SYS_FUNC(io_cancel)
 217 {
 218         if (entering(tcp)) {
 219                 printaddr(tcp->u_arg[0]);
 220                 tprints(", ");
 221
 222                 struct iocb cb;
 223
 224                 if (!umove_or_printaddr(tcp, tcp->u_arg[1], &cb)) {
 225                         tprints("{");
 226                         print_iocb_header(tcp, &cb);
 227                         tprints("}");
 228                 }
 229                 tprints(", ");
 230         } else {
 231                 struct io_event event;
 232
 233                 if (!umove_or_printaddr(tcp, tcp->u_arg[2], &event))
 234                         print_io_event(tcp, &event, sizeof(event), 0);
 235         }
 236         return 0;
 237 }
 238
 239 static int
 240 print_io_getevents(struct tcb *tcp, bool has_usig)
 241 {
 242         if (entering(tcp)) {
 243                 printaddr(tcp->u_arg[0]);
 244                 tprintf(", %" PRI_kld ", %" PRI_kld ", ",
 245                         truncate_klong_to_current_wordsize(tcp->u_arg[1]),
 246                         truncate_klong_to_current_wordsize(tcp->u_arg[2]));
 247         } else {
 248                 struct io_event buf;
 249                 print_array(tcp, tcp->u_arg[3], tcp->u_rval, &buf, sizeof(buf),
 250                             tfetch_mem, print_io_event, 0);
 251                 tprints(", ");
 252                 /*
 253                  * Since the timeout and usig parameters are read by the kernel
 254                  * on entering syscall, it has to be decoded the same way
 255                  * whether the syscall has failed or not.
 256                  */
 257                 temporarily_clear_syserror(tcp);
 258                 print_timespec(tcp, tcp->u_arg[4]);
 259                 if (has_usig) {
 260                         tprints(", ");
 261                         print_aio_sigset(tcp, tcp->u_arg[5]);
 262                 }
 263                 restore_cleared_syserror(tcp);
 264         }
 265         return 0;
 266 }
 267
 268 SYS_FUNC(io_getevents)
 269 {
 270         return print_io_getevents(tcp, false);
 271 }
 272
 273 SYS_FUNC(io_pgetevents)
 274 {
 275         return print_io_getevents(tcp, true);
 276 }