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  *      $Id$
  29  */
  30
  31 #include "defs.h"
  32 #include <sys/syscall.h>
  33
  34 #ifdef HAVE_POLL_H
  35 #include <poll.h>
  36 #endif
  37 #ifdef HAVE_SYS_POLL_H
  38 #include <sys/poll.h>
  39 #endif
  40 #ifdef HAVE_STROPTS_H
  41 #include <stropts.h>
  42 #endif
  43 #ifdef HAVE_SYS_CONF_H
  44 #include <sys/conf.h>
  45 #endif
  46
  47 #ifndef HAVE_STROPTS_H
  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 /* !HAVE_STROPTS_H */
  57
  58 static const struct xlat msgflags[] = {
  59         { RS_HIPRI,     "RS_HIPRI"      },
  60         { 0,            NULL            },
  61 };
  62
  63 static void
  64 printstrbuf(struct tcb *tcp, struct strbuf *sbp, int getting)
  65 {
  66         if (sbp->maxlen == -1 && getting)
  67                 tprints("{maxlen=-1}");
  68         else {
  69                 tprints("{");
  70                 if (getting)
  71                         tprintf("maxlen=%d, ", sbp->maxlen);
  72                 tprintf("len=%d, buf=", sbp->len);
  73                 printstr(tcp, (unsigned long) sbp->buf, sbp->len);
  74                 tprints("}");
  75         }
  76 }
  77
  78 static void
  79 printstrbufarg(struct tcb *tcp, int arg, int getting)
  80 {
  81         struct strbuf buf;
  82
  83         if (arg == 0)
  84                 tprints("NULL");
  85         else if (umove(tcp, arg, &buf) < 0)
  86                 tprints("{...}");
  87         else
  88                 printstrbuf(tcp, &buf, getting);
  89         tprints(", ");
  90 }
  91
  92 int
  93 sys_putmsg(struct tcb *tcp)
  94 {
  95         int i;
  96
  97         if (entering(tcp)) {
  98                 /* fd */
  99                 tprintf("%ld, ", tcp->u_arg[0]);
 100                 /* control and data */
 101                 for (i = 1; i < 3; i++)
 102                         printstrbufarg(tcp, tcp->u_arg[i], 0);
 103                 /* flags */
 104                 printflags(msgflags, tcp->u_arg[3], "RS_???");
 105         }
 106         return 0;
 107 }
 108
 109 #if defined(SPARC) || defined(SPARC64)
 110 int
 111 sys_getmsg(struct tcb *tcp)
 112 {
 113         int i, flags;
 114
 115         if (entering(tcp)) {
 116                 /* fd */
 117                 tprintf("%lu, ", tcp->u_arg[0]);
 118         } else {
 119                 if (syserror(tcp)) {
 120                         tprintf("%#lx, %#lx, %#lx",
 121                                 tcp->u_arg[1], tcp->u_arg[2], tcp->u_arg[3]);
 122                         return 0;
 123                 }
 124                 /* control and data */
 125                 for (i = 1; i < 3; i++)
 126                         printstrbufarg(tcp, tcp->u_arg[i], 1);
 127                 /* pointer to flags */
 128                 if (tcp->u_arg[3] == 0)
 129                         tprints("NULL");
 130                 else if (umove(tcp, tcp->u_arg[3], &flags) < 0)
 131                         tprints("[?]");
 132                 else {
 133                         tprints("[");
 134                         printflags(msgflags, flags, "RS_???");
 135                         tprints("]");
 136                 }
 137                 /* decode return value */
 138                 switch (tcp->u_rval) {
 139                 case MORECTL:
 140                         tcp->auxstr = "MORECTL";
 141                         break;
 142                 case MORECTL|MOREDATA:
 143                         tcp->auxstr = "MORECTL|MOREDATA";
 144                         break;
 145                 case MOREDATA:
 146                         tcp->auxstr = "MORECTL";
 147                         break;
 148                 default:
 149                         tcp->auxstr = NULL;
 150                         break;
 151                 }
 152         }
 153         return RVAL_HEX | RVAL_STR;
 154 }
 155 #endif
 156
 157 #if defined SYS_putpmsg || defined SYS_getpmsg
 158 static const struct xlat pmsgflags[] = {
 159 #ifdef MSG_HIPRI
 160         { MSG_HIPRI,    "MSG_HIPRI"     },
 161 #endif
 162 #ifdef MSG_AND
 163         { MSG_ANY,      "MSG_ANY"       },
 164 #endif
 165 #ifdef MSG_BAND
 166         { MSG_BAND,     "MSG_BAND"      },
 167 #endif
 168         { 0,            NULL            },
 169 };
 170 #endif
 171
 172 #ifdef SYS_putpmsg
 173 int
 174 sys_putpmsg(struct tcb *tcp)
 175 {
 176         int i;
 177
 178         if (entering(tcp)) {
 179                 /* fd */
 180                 tprintf("%ld, ", tcp->u_arg[0]);
 181                 /* control and data */
 182                 for (i = 1; i < 3; i++)
 183                         printstrbufarg(tcp, tcp->u_arg[i], 0);
 184                 /* band */
 185                 tprintf("%ld, ", tcp->u_arg[3]);
 186                 /* flags */
 187                 printflags(pmsgflags, tcp->u_arg[4], "MSG_???");
 188         }
 189         return 0;
 190 }
 191 #endif /* SYS_putpmsg */
 192
 193 #ifdef SYS_getpmsg
 194 int
 195 sys_getpmsg(struct tcb *tcp)
 196 {
 197         int i, flags;
 198
 199         if (entering(tcp)) {
 200                 /* fd */
 201                 tprintf("%lu, ", tcp->u_arg[0]);
 202         } else {
 203                 if (syserror(tcp)) {
 204                         tprintf("%#lx, %#lx, %#lx, %#lx", tcp->u_arg[1],
 205                                 tcp->u_arg[2], tcp->u_arg[3], tcp->u_arg[4]);
 206                         return 0;
 207                 }
 208                 /* control and data */
 209                 for (i = 1; i < 3; i++)
 210                         printstrbufarg(tcp, tcp->u_arg[i], 1);
 211                 /* pointer to band */
 212                 printnum(tcp, tcp->u_arg[3], "%d");
 213                 tprints(", ");
 214                 /* pointer to flags */
 215                 if (tcp->u_arg[4] == 0)
 216                         tprints("NULL");
 217                 else if (umove(tcp, tcp->u_arg[4], &flags) < 0)
 218                         tprints("[?]");
 219                 else {
 220                         tprints("[");
 221                         printflags(pmsgflags, flags, "MSG_???");
 222                         tprints("]");
 223                 }
 224                 /* decode return value */
 225                 switch (tcp->u_rval) {
 226                 case MORECTL:
 227                         tcp->auxstr = "MORECTL";
 228                         break;
 229                 case MORECTL|MOREDATA:
 230                         tcp->auxstr = "MORECTL|MOREDATA";
 231                         break;
 232                 case MOREDATA:
 233                         tcp->auxstr = "MORECTL";
 234                         break;
 235                 default:
 236                         tcp->auxstr = NULL;
 237                         break;
 238                 }
 239         }
 240         return RVAL_HEX | RVAL_STR;
 241 }
 242 #endif /* SYS_getpmsg */
 243
 244 #ifdef HAVE_SYS_POLL_H
 245
 246 static const struct xlat pollflags[] = {
 247 #ifdef POLLIN
 248         { POLLIN,       "POLLIN"        },
 249         { POLLPRI,      "POLLPRI"       },
 250         { POLLOUT,      "POLLOUT"       },
 251 #ifdef POLLRDNORM
 252         { POLLRDNORM,   "POLLRDNORM"    },
 253 #endif
 254 #ifdef POLLWRNORM
 255         { POLLWRNORM,   "POLLWRNORM"    },
 256 #endif
 257 #ifdef POLLRDBAND
 258         { POLLRDBAND,   "POLLRDBAND"    },
 259 #endif
 260 #ifdef POLLWRBAND
 261         { POLLWRBAND,   "POLLWRBAND"    },
 262 #endif
 263         { POLLERR,      "POLLERR"       },
 264         { POLLHUP,      "POLLHUP"       },
 265         { POLLNVAL,     "POLLNVAL"      },
 266 #endif
 267         { 0,            NULL            },
 268 };
 269
 270 static int
 271 decode_poll(struct tcb *tcp, long pts)
 272 {
 273         struct pollfd fds;
 274         unsigned nfds;
 275         unsigned long size, start, cur, end, abbrev_end;
 276         int failed = 0;
 277
 278         if (entering(tcp)) {
 279                 nfds = tcp->u_arg[1];
 280                 size = sizeof(fds) * nfds;
 281                 start = tcp->u_arg[0];
 282                 end = start + size;
 283                 if (nfds == 0 || size / sizeof(fds) != nfds || end < start) {
 284                         tprintf("%#lx, %d, ",
 285                                 tcp->u_arg[0], nfds);
 286                         return 0;
 287                 }
 288                 if (abbrev(tcp)) {
 289                         abbrev_end = start + max_strlen * sizeof(fds);
 290                         if (abbrev_end < start)
 291                                 abbrev_end = end;
 292                 } else {
 293                         abbrev_end = end;
 294                 }
 295                 tprints("[");
 296                 for (cur = start; cur < end; cur += sizeof(fds)) {
 297                         if (cur > start)
 298                                 tprints(", ");
 299                         if (cur >= abbrev_end) {
 300                                 tprints("...");
 301                                 break;
 302                         }
 303                         if (umoven(tcp, cur, sizeof fds, (char *) &fds) < 0) {
 304                                 tprints("?");
 305                                 failed = 1;
 306                                 break;
 307                         }
 308                         if (fds.fd < 0) {
 309                                 tprintf("{fd=%d}", fds.fd);
 310                                 continue;
 311                         }
 312                         tprints("{fd=");
 313                         printfd(tcp, fds.fd);
 314                         tprints(", events=");
 315                         printflags(pollflags, fds.events, "POLL???");
 316                         tprints("}");
 317                 }
 318                 tprints("]");
 319                 if (failed)
 320                         tprintf(" %#lx", start);
 321                 tprintf(", %d, ", nfds);
 322                 return 0;
 323         } else {
 324                 static char outstr[1024];
 325                 char *outptr;
 326 #define end_outstr (outstr + sizeof(outstr))
 327                 const char *flagstr;
 328
 329                 if (syserror(tcp))
 330                         return 0;
 331                 if (tcp->u_rval == 0) {
 332                         tcp->auxstr = "Timeout";
 333                         return RVAL_STR;
 334                 }
 335
 336                 nfds = tcp->u_arg[1];
 337                 size = sizeof(fds) * nfds;
 338                 start = tcp->u_arg[0];
 339                 end = start + size;
 340                 if (nfds == 0 || size / sizeof(fds) != nfds || end < start)
 341                         return 0;
 342                 if (abbrev(tcp)) {
 343                         abbrev_end = start + max_strlen * sizeof(fds);
 344                         if (abbrev_end < start)
 345                                 abbrev_end = end;
 346                 } else {
 347                         abbrev_end = end;
 348                 }
 349
 350                 outptr = outstr;
 351
 352                 for (cur = start; cur < end; cur += sizeof(fds)) {
 353                         if (umoven(tcp, cur, sizeof fds, (char *) &fds) < 0) {
 354                                 if (outptr < end_outstr - 2)
 355                                         *outptr++ = '?';
 356                                 failed = 1;
 357                                 break;
 358                         }
 359                         if (!fds.revents)
 360                                 continue;
 361                         if (outptr == outstr) {
 362                                 *outptr++ = '[';
 363                         } else {
 364                                 if (outptr < end_outstr - 3)
 365                                         outptr = stpcpy(outptr, ", ");
 366                         }
 367                         if (cur >= abbrev_end) {
 368                                 if (outptr < end_outstr - 4)
 369                                         outptr = stpcpy(outptr, "...");
 370                                 break;
 371                         }
 372                         if (outptr < end_outstr - (sizeof("{fd=%d, revents=") + sizeof(int)*3) + 1)
 373                                 outptr += sprintf(outptr, "{fd=%d, revents=", fds.fd);
 374                         flagstr = sprintflags("", pollflags, fds.revents);
 375                         if (outptr < end_outstr - (strlen(flagstr) + 2)) {
 376                                 outptr = stpcpy(outptr, flagstr);
 377                                 *outptr++ = '}';
 378                         }
 379                 }
 380                 if (failed)
 381                         return 0;
 382
 383                 if (outptr != outstr /* && outptr < end_outstr - 1 (always true)*/)
 384                         *outptr++ = ']';
 385
 386                 *outptr = '\0';
 387                 if (pts) {
 388                         if (outptr < end_outstr - (10 + TIMESPEC_TEXT_BUFSIZE)) {
 389                                 outptr = stpcpy(outptr, outptr == outstr ? "left " : ", left ");
 390                                 sprint_timespec(outptr, tcp, pts);
 391                         }
 392                 }
 393
 394                 if (outptr == outstr)
 395                         return 0;
 396
 397                 tcp->auxstr = outstr;
 398                 return RVAL_STR;
 399 #undef end_outstr
 400         }
 401 }
 402
 403 int
 404 sys_poll(struct tcb *tcp)
 405 {
 406         int rc = decode_poll(tcp, 0);
 407         if (entering(tcp)) {
 408 #ifdef INFTIM
 409                 if (tcp->u_arg[2] == INFTIM)
 410                         tprints("INFTIM");
 411                 else
 412 #endif
 413                         tprintf("%ld", tcp->u_arg[2]);
 414         }
 415         return rc;
 416 }
 417
 418 int
 419 sys_ppoll(struct tcb *tcp)
 420 {
 421         int rc = decode_poll(tcp, tcp->u_arg[2]);
 422         if (entering(tcp)) {
 423                 print_timespec(tcp, tcp->u_arg[2]);
 424                 tprints(", ");
 425                 print_sigset(tcp, tcp->u_arg[3], 0);
 426                 tprintf(", %lu", tcp->u_arg[4]);
 427         }
 428         return rc;
 429 }
 430
 431 #else /* !HAVE_SYS_POLL_H */
 432 int
 433 sys_poll(struct tcb *tcp)
 434 {
 435         return 0;
 436 }
 437 #endif