granicus.if.org Git - strace/blob - stream.c

   1 /*
   2  * Copyright (c) 1993, 1994, 1995, 1996 Rick Sladkey <jrs@world.std.com>
   3  * Copyright (c) 1996-1999 Wichert Akkerman <wichert@cistron.nl>
   4  * All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  * 1. Redistributions of source code must retain the above copyright
  10  *    notice, this list of conditions and the following disclaimer.
  11  * 2. Redistributions in binary form must reproduce the above copyright
  12  *    notice, this list of conditions and the following disclaimer in the
  13  *    documentation and/or other materials provided with the distribution.
  14  * 3. The name of the author may not be used to endorse or promote products
  15  *    derived from this software without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  18  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  19  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  20  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  21  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  22  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  23  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  24  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  26  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27  */
  28
  29 #include "defs.h"
  30 #if defined HAVE_POLL_H
  31 # include <poll.h>
  32 #elif defined HAVE_SYS_POLL_H
  33 # include <sys/poll.h>
  34 #endif
  35 #ifdef HAVE_SYS_CONF_H
  36 # include <sys/conf.h>
  37 #endif
  38
  39 /* Who has STREAMS syscalls?
  40  * Linux hasn't. Solaris has (had?).
  41  * Just in case I miss something, retain in for Sparc...
  42  */
  43 #if defined(SPARC) || defined(SPARC64)
  44
  45 # ifdef HAVE_STROPTS_H
  46 #  include <stropts.h>
  47 # else
  48 #  define RS_HIPRI 1
  49 struct strbuf {
  50         int     maxlen;                 /* no. of bytes in buffer */
  51         int     len;                    /* no. of bytes returned */
  52         const char *buf;                /* pointer to data */
  53 };
  54 #  define MORECTL 1
  55 #  define MOREDATA 2
  56 # endif
  57
  58 #include "xlat/msgflags.h"
  59
  60 static void
  61 printstrbuf(struct tcb *tcp, struct strbuf *sbp, int getting)
  62 {
  63         if (sbp->maxlen == -1 && getting)
  64                 tprints("{maxlen=-1}");
  65         else {
  66                 tprints("{");
  67                 if (getting)
  68                         tprintf("maxlen=%d, ", sbp->maxlen);
  69                 tprintf("len=%d, buf=", sbp->len);
  70                 printstr(tcp, (unsigned long) sbp->buf, sbp->len);
  71                 tprints("}");
  72         }
  73 }
  74
  75 static void
  76 printstrbufarg(struct tcb *tcp, long arg, int getting)
  77 {
  78         struct strbuf buf;
  79
  80         if (arg == 0)
  81                 tprints("NULL");
  82         else if (umove(tcp, arg, &buf) < 0)
  83                 tprints("{...}");
  84         else
  85                 printstrbuf(tcp, &buf, getting);
  86         tprints(", ");
  87 }
  88
  89 SYS_FUNC(putmsg)
  90 {
  91         int i;
  92
  93         if (entering(tcp)) {
  94                 /* fd */
  95                 tprintf("%ld, ", tcp->u_arg[0]);
  96                 /* control and data */
  97                 for (i = 1; i < 3; i++)
  98                         printstrbufarg(tcp, tcp->u_arg[i], 0);
  99                 /* flags */
 100                 printflags(msgflags, tcp->u_arg[3], "RS_???");
 101         }
 102         return 0;
 103 }
 104
 105 SYS_FUNC(getmsg)
 106 {
 107         int i, flags;
 108
 109         if (entering(tcp)) {
 110                 /* fd */
 111                 tprintf("%lu, ", tcp->u_arg[0]);
 112         } else {
 113                 if (syserror(tcp)) {
 114                         tprintf("%#lx, %#lx, %#lx",
 115                                 tcp->u_arg[1], tcp->u_arg[2], tcp->u_arg[3]);
 116                         return 0;
 117                 }
 118                 /* control and data */
 119                 for (i = 1; i < 3; i++)
 120                         printstrbufarg(tcp, tcp->u_arg[i], 1);
 121                 /* pointer to flags */
 122                 if (tcp->u_arg[3] == 0)
 123                         tprints("NULL");
 124                 else if (umove(tcp, tcp->u_arg[3], &flags) < 0)
 125                         tprints("[?]");
 126                 else {
 127                         tprints("[");
 128                         printflags(msgflags, flags, "RS_???");
 129                         tprints("]");
 130                 }
 131                 /* decode return value */
 132                 switch (tcp->u_rval) {
 133                 case MORECTL:
 134                         tcp->auxstr = "MORECTL";
 135                         break;
 136                 case MORECTL|MOREDATA:
 137                         tcp->auxstr = "MORECTL|MOREDATA";
 138                         break;
 139                 case MOREDATA:
 140                         tcp->auxstr = "MORECTL";
 141                         break;
 142                 default:
 143                         tcp->auxstr = NULL;
 144                         break;
 145                 }
 146         }
 147         return RVAL_HEX | RVAL_STR;
 148 }
 149
 150 # if defined SYS_putpmsg || defined SYS_getpmsg
 151 #include "xlat/pmsgflags.h"
 152 #  ifdef SYS_putpmsg
 153 SYS_FUNC(putpmsg)
 154 {
 155         int i;
 156
 157         if (entering(tcp)) {
 158                 /* fd */
 159                 tprintf("%ld, ", tcp->u_arg[0]);
 160                 /* control and data */
 161                 for (i = 1; i < 3; i++)
 162                         printstrbufarg(tcp, tcp->u_arg[i], 0);
 163                 /* band */
 164                 tprintf("%ld, ", tcp->u_arg[3]);
 165                 /* flags */
 166                 printflags(pmsgflags, tcp->u_arg[4], "MSG_???");
 167         }
 168         return 0;
 169 }
 170 #  endif
 171 #  ifdef SYS_getpmsg
 172 SYS_FUNC(getpmsg)
 173 {
 174         int i, flags;
 175
 176         if (entering(tcp)) {
 177                 /* fd */
 178                 tprintf("%lu, ", tcp->u_arg[0]);
 179         } else {
 180                 if (syserror(tcp)) {
 181                         tprintf("%#lx, %#lx, %#lx, %#lx", tcp->u_arg[1],
 182                                 tcp->u_arg[2], tcp->u_arg[3], tcp->u_arg[4]);
 183                         return 0;
 184                 }
 185                 /* control and data */
 186                 for (i = 1; i < 3; i++)
 187                         printstrbufarg(tcp, tcp->u_arg[i], 1);
 188                 /* pointer to band */
 189                 printnum_int(tcp, tcp->u_arg[3], "%d");
 190                 tprints(", ");
 191                 /* pointer to flags */
 192                 if (tcp->u_arg[4] == 0)
 193                         tprints("NULL");
 194                 else if (umove(tcp, tcp->u_arg[4], &flags) < 0)
 195                         tprints("[?]");
 196                 else {
 197                         tprints("[");
 198                         printflags(pmsgflags, flags, "MSG_???");
 199                         tprints("]");
 200                 }
 201                 /* decode return value */
 202                 switch (tcp->u_rval) {
 203                 case MORECTL:
 204                         tcp->auxstr = "MORECTL";
 205                         break;
 206                 case MORECTL|MOREDATA:
 207                         tcp->auxstr = "MORECTL|MOREDATA";
 208                         break;
 209                 case MOREDATA:
 210                         tcp->auxstr = "MORECTL";
 211                         break;
 212                 default:
 213                         tcp->auxstr = NULL;
 214                         break;
 215                 }
 216         }
 217         return RVAL_HEX | RVAL_STR;
 218 }
 219 #  endif
 220 # endif /* getpmsg/putpmsg */
 221
 222 #endif /* STREAMS syscalls support */
 223
 224
 225 #ifdef HAVE_SYS_POLL_H
 226
 227 #include "xlat/pollflags.h"
 228
 229 static int
 230 decode_poll(struct tcb *tcp, long pts)
 231 {
 232         struct pollfd fds;
 233         unsigned nfds;
 234         unsigned long size, start, cur, end, abbrev_end;
 235         int failed = 0;
 236
 237         if (entering(tcp)) {
 238                 nfds = tcp->u_arg[1];
 239                 size = sizeof(fds) * nfds;
 240                 start = tcp->u_arg[0];
 241                 end = start + size;
 242                 if (nfds == 0 || size / sizeof(fds) != nfds || end < start) {
 243                         tprintf("%#lx, %d, ",
 244                                 tcp->u_arg[0], nfds);
 245                         return 0;
 246                 }
 247                 if (abbrev(tcp)) {
 248                         abbrev_end = start + max_strlen * sizeof(fds);
 249                         if (abbrev_end < start)
 250                                 abbrev_end = end;
 251                 } else {
 252                         abbrev_end = end;
 253                 }
 254                 tprints("[");
 255                 for (cur = start; cur < end; cur += sizeof(fds)) {
 256                         if (cur > start)
 257                                 tprints(", ");
 258                         if (cur >= abbrev_end) {
 259                                 tprints("...");
 260                                 break;
 261                         }
 262                         if (umoven(tcp, cur, sizeof fds, &fds) < 0) {
 263                                 tprints("?");
 264                                 failed = 1;
 265                                 break;
 266                         }
 267                         if (fds.fd < 0) {
 268                                 tprintf("{fd=%d}", fds.fd);
 269                                 continue;
 270                         }
 271                         tprints("{fd=");
 272                         printfd(tcp, fds.fd);
 273                         tprints(", events=");
 274                         printflags(pollflags, fds.events, "POLL???");
 275                         tprints("}");
 276                 }
 277                 tprints("]");
 278                 if (failed)
 279                         tprintf(" %#lx", start);
 280                 tprintf(", %d, ", nfds);
 281                 return 0;
 282         } else {
 283                 static char outstr[1024];
 284                 char *outptr;
 285 #define end_outstr (outstr + sizeof(outstr))
 286                 const char *flagstr;
 287
 288                 if (syserror(tcp))
 289                         return 0;
 290                 if (tcp->u_rval == 0) {
 291                         tcp->auxstr = "Timeout";
 292                         return RVAL_STR;
 293                 }
 294
 295                 nfds = tcp->u_arg[1];
 296                 size = sizeof(fds) * nfds;
 297                 start = tcp->u_arg[0];
 298                 end = start + size;
 299                 if (nfds == 0 || size / sizeof(fds) != nfds || end < start)
 300                         return 0;
 301                 if (abbrev(tcp)) {
 302                         abbrev_end = start + max_strlen * sizeof(fds);
 303                         if (abbrev_end < start)
 304                                 abbrev_end = end;
 305                 } else {
 306                         abbrev_end = end;
 307                 }
 308
 309                 outptr = outstr;
 310
 311                 for (cur = start; cur < end; cur += sizeof(fds)) {
 312                         if (umoven(tcp, cur, sizeof fds, &fds) < 0) {
 313                                 if (outptr < end_outstr - 2)
 314                                         *outptr++ = '?';
 315                                 failed = 1;
 316                                 break;
 317                         }
 318                         if (!fds.revents)
 319                                 continue;
 320                         if (outptr == outstr) {
 321                                 *outptr++ = '[';
 322                         } else {
 323                                 if (outptr < end_outstr - 3)
 324                                         outptr = stpcpy(outptr, ", ");
 325                         }
 326                         if (cur >= abbrev_end) {
 327                                 if (outptr < end_outstr - 4)
 328                                         outptr = stpcpy(outptr, "...");
 329                                 break;
 330                         }
 331                         if (outptr < end_outstr - (sizeof("{fd=%d, revents=") + sizeof(int)*3) + 1)
 332                                 outptr += sprintf(outptr, "{fd=%d, revents=", fds.fd);
 333                         flagstr = sprintflags("", pollflags, fds.revents);
 334                         if (outptr < end_outstr - (strlen(flagstr) + 2)) {
 335                                 outptr = stpcpy(outptr, flagstr);
 336                                 *outptr++ = '}';
 337                         }
 338                 }
 339                 if (failed)
 340                         return 0;
 341
 342                 if (outptr != outstr /* && outptr < end_outstr - 1 (always true)*/)
 343                         *outptr++ = ']';
 344
 345                 *outptr = '\0';
 346                 if (pts) {
 347                         if (outptr < end_outstr - (10 + TIMESPEC_TEXT_BUFSIZE)) {
 348                                 outptr = stpcpy(outptr, outptr == outstr ? "left " : ", left ");
 349                                 sprint_timespec(outptr, tcp, pts);
 350                         }
 351                 }
 352
 353                 if (outptr == outstr)
 354                         return 0;
 355
 356                 tcp->auxstr = outstr;
 357                 return RVAL_STR;
 358 #undef end_outstr
 359         }
 360 }
 361
 362 SYS_FUNC(poll)
 363 {
 364         int rc = decode_poll(tcp, 0);
 365         if (entering(tcp)) {
 366 # ifdef INFTIM
 367                 if (tcp->u_arg[2] == INFTIM)
 368                         tprints("INFTIM");
 369                 else
 370 # endif
 371                         tprintf("%ld", tcp->u_arg[2]);
 372         }
 373         return rc;
 374 }
 375
 376 SYS_FUNC(ppoll)
 377 {
 378         int rc = decode_poll(tcp, tcp->u_arg[2]);
 379         if (entering(tcp)) {
 380                 print_timespec(tcp, tcp->u_arg[2]);
 381                 tprints(", ");
 382                 /* NB: kernel requires arg[4] == NSIG / 8 */
 383                 print_sigset_addr_len(tcp, tcp->u_arg[3], tcp->u_arg[4]);
 384                 tprintf(", %lu", tcp->u_arg[4]);
 385         }
 386         return rc;
 387 }
 388
 389 #else /* !HAVE_SYS_POLL_H */
 390 SYS_FUNC(poll)
 391 {
 392         return 0;
 393 }
 394 #endif