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 #ifdef HAVE_POLL_H
  31 # include <poll.h>
  32 #endif
  33 #ifdef HAVE_SYS_POLL_H
  34 # include <sys/poll.h>
  35 #endif
  36 #ifdef HAVE_STROPTS_H
  37 # include <stropts.h>
  38 #endif
  39 #ifdef HAVE_SYS_CONF_H
  40 # include <sys/conf.h>
  41 #endif
  42
  43 #ifndef HAVE_STROPTS_H
  44 #define RS_HIPRI 1
  45 struct strbuf {
  46         int     maxlen;                 /* no. of bytes in buffer */
  47         int     len;                    /* no. of bytes returned */
  48         const char *buf;                /* pointer to data */
  49 };
  50 #define MORECTL 1
  51 #define MOREDATA 2
  52 #endif /* !HAVE_STROPTS_H */
  53
  54 static const struct xlat msgflags[] = {
  55         { RS_HIPRI,     "RS_HIPRI"      },
  56         { 0,            NULL            },
  57 };
  58
  59 static void
  60 printstrbuf(struct tcb *tcp, struct strbuf *sbp, int getting)
  61 {
  62         if (sbp->maxlen == -1 && getting)
  63                 tprints("{maxlen=-1}");
  64         else {
  65                 tprints("{");
  66                 if (getting)
  67                         tprintf("maxlen=%d, ", sbp->maxlen);
  68                 tprintf("len=%d, buf=", sbp->len);
  69                 printstr(tcp, (unsigned long) sbp->buf, sbp->len);
  70                 tprints("}");
  71         }
  72 }
  73
  74 static void
  75 printstrbufarg(struct tcb *tcp, long arg, int getting)
  76 {
  77         struct strbuf buf;
  78
  79         if (arg == 0)
  80                 tprints("NULL");
  81         else if (umove(tcp, arg, &buf) < 0)
  82                 tprints("{...}");
  83         else
  84                 printstrbuf(tcp, &buf, getting);
  85         tprints(", ");
  86 }
  87
  88 int
  89 sys_putmsg(struct tcb *tcp)
  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 #if defined(SPARC) || defined(SPARC64)
 106 int
 107 sys_getmsg(struct tcb *tcp)
 108 {
 109         int i, flags;
 110
 111         if (entering(tcp)) {
 112                 /* fd */
 113                 tprintf("%lu, ", tcp->u_arg[0]);
 114         } else {
 115                 if (syserror(tcp)) {
 116                         tprintf("%#lx, %#lx, %#lx",
 117                                 tcp->u_arg[1], tcp->u_arg[2], tcp->u_arg[3]);
 118                         return 0;
 119                 }
 120                 /* control and data */
 121                 for (i = 1; i < 3; i++)
 122                         printstrbufarg(tcp, tcp->u_arg[i], 1);
 123                 /* pointer to flags */
 124                 if (tcp->u_arg[3] == 0)
 125                         tprints("NULL");
 126                 else if (umove(tcp, tcp->u_arg[3], &flags) < 0)
 127                         tprints("[?]");
 128                 else {
 129                         tprints("[");
 130                         printflags(msgflags, flags, "RS_???");
 131                         tprints("]");
 132                 }
 133                 /* decode return value */
 134                 switch (tcp->u_rval) {
 135                 case MORECTL:
 136                         tcp->auxstr = "MORECTL";
 137                         break;
 138                 case MORECTL|MOREDATA:
 139                         tcp->auxstr = "MORECTL|MOREDATA";
 140                         break;
 141                 case MOREDATA:
 142                         tcp->auxstr = "MORECTL";
 143                         break;
 144                 default:
 145                         tcp->auxstr = NULL;
 146                         break;
 147                 }
 148         }
 149         return RVAL_HEX | RVAL_STR;
 150 }
 151 #endif
 152
 153 #if defined SYS_putpmsg || defined SYS_getpmsg
 154 static const struct xlat pmsgflags[] = {
 155 #ifdef MSG_HIPRI
 156         { MSG_HIPRI,    "MSG_HIPRI"     },
 157 #endif
 158 #ifdef MSG_AND
 159         { MSG_ANY,      "MSG_ANY"       },
 160 #endif
 161 #ifdef MSG_BAND
 162         { MSG_BAND,     "MSG_BAND"      },
 163 #endif
 164         { 0,            NULL            },
 165 };
 166 #endif
 167
 168 #ifdef SYS_putpmsg
 169 int
 170 sys_putpmsg(struct tcb *tcp)
 171 {
 172         int i;
 173
 174         if (entering(tcp)) {
 175                 /* fd */
 176                 tprintf("%ld, ", tcp->u_arg[0]);
 177                 /* control and data */
 178                 for (i = 1; i < 3; i++)
 179                         printstrbufarg(tcp, tcp->u_arg[i], 0);
 180                 /* band */
 181                 tprintf("%ld, ", tcp->u_arg[3]);
 182                 /* flags */
 183                 printflags(pmsgflags, tcp->u_arg[4], "MSG_???");
 184         }
 185         return 0;
 186 }
 187 #endif /* SYS_putpmsg */
 188
 189 #ifdef SYS_getpmsg
 190 int
 191 sys_getpmsg(struct tcb *tcp)
 192 {
 193         int i, flags;
 194
 195         if (entering(tcp)) {
 196                 /* fd */
 197                 tprintf("%lu, ", tcp->u_arg[0]);
 198         } else {
 199                 if (syserror(tcp)) {
 200                         tprintf("%#lx, %#lx, %#lx, %#lx", tcp->u_arg[1],
 201                                 tcp->u_arg[2], tcp->u_arg[3], tcp->u_arg[4]);
 202                         return 0;
 203                 }
 204                 /* control and data */
 205                 for (i = 1; i < 3; i++)
 206                         printstrbufarg(tcp, tcp->u_arg[i], 1);
 207                 /* pointer to band */
 208                 printnum(tcp, tcp->u_arg[3], "%d");
 209                 tprints(", ");
 210                 /* pointer to flags */
 211                 if (tcp->u_arg[4] == 0)
 212                         tprints("NULL");
 213                 else if (umove(tcp, tcp->u_arg[4], &flags) < 0)
 214                         tprints("[?]");
 215                 else {
 216                         tprints("[");
 217                         printflags(pmsgflags, flags, "MSG_???");
 218                         tprints("]");
 219                 }
 220                 /* decode return value */
 221                 switch (tcp->u_rval) {
 222                 case MORECTL:
 223                         tcp->auxstr = "MORECTL";
 224                         break;
 225                 case MORECTL|MOREDATA:
 226                         tcp->auxstr = "MORECTL|MOREDATA";
 227                         break;
 228                 case MOREDATA:
 229                         tcp->auxstr = "MORECTL";
 230                         break;
 231                 default:
 232                         tcp->auxstr = NULL;
 233                         break;
 234                 }
 235         }
 236         return RVAL_HEX | RVAL_STR;
 237 }
 238 #endif /* SYS_getpmsg */
 239
 240 #ifdef HAVE_SYS_POLL_H
 241
 242 static const struct xlat pollflags[] = {
 243 #ifdef POLLIN
 244         { POLLIN,       "POLLIN"        },
 245         { POLLPRI,      "POLLPRI"       },
 246         { POLLOUT,      "POLLOUT"       },
 247 #ifdef POLLRDNORM
 248         { POLLRDNORM,   "POLLRDNORM"    },
 249 #endif
 250 #ifdef POLLWRNORM
 251         { POLLWRNORM,   "POLLWRNORM"    },
 252 #endif
 253 #ifdef POLLRDBAND
 254         { POLLRDBAND,   "POLLRDBAND"    },
 255 #endif
 256 #ifdef POLLWRBAND
 257         { POLLWRBAND,   "POLLWRBAND"    },
 258 #endif
 259         { POLLERR,      "POLLERR"       },
 260         { POLLHUP,      "POLLHUP"       },
 261         { POLLNVAL,     "POLLNVAL"      },
 262 #endif
 263         { 0,            NULL            },
 264 };
 265
 266 static int
 267 decode_poll(struct tcb *tcp, long pts)
 268 {
 269         struct pollfd fds;
 270         unsigned nfds;
 271         unsigned long size, start, cur, end, abbrev_end;
 272         int failed = 0;
 273
 274         if (entering(tcp)) {
 275                 nfds = tcp->u_arg[1];
 276                 size = sizeof(fds) * nfds;
 277                 start = tcp->u_arg[0];
 278                 end = start + size;
 279                 if (nfds == 0 || size / sizeof(fds) != nfds || end < start) {
 280                         tprintf("%#lx, %d, ",
 281                                 tcp->u_arg[0], nfds);
 282                         return 0;
 283                 }
 284                 if (abbrev(tcp)) {
 285                         abbrev_end = start + max_strlen * sizeof(fds);
 286                         if (abbrev_end < start)
 287                                 abbrev_end = end;
 288                 } else {
 289                         abbrev_end = end;
 290                 }
 291                 tprints("[");
 292                 for (cur = start; cur < end; cur += sizeof(fds)) {
 293                         if (cur > start)
 294                                 tprints(", ");
 295                         if (cur >= abbrev_end) {
 296                                 tprints("...");
 297                                 break;
 298                         }
 299                         if (umoven(tcp, cur, sizeof fds, (char *) &fds) < 0) {
 300                                 tprints("?");
 301                                 failed = 1;
 302                                 break;
 303                         }
 304                         if (fds.fd < 0) {
 305                                 tprintf("{fd=%d}", fds.fd);
 306                                 continue;
 307                         }
 308                         tprints("{fd=");
 309                         printfd(tcp, fds.fd);
 310                         tprints(", events=");
 311                         printflags(pollflags, fds.events, "POLL???");
 312                         tprints("}");
 313                 }
 314                 tprints("]");
 315                 if (failed)
 316                         tprintf(" %#lx", start);
 317                 tprintf(", %d, ", nfds);
 318                 return 0;
 319         } else {
 320                 static char outstr[1024];
 321                 char *outptr;
 322 #define end_outstr (outstr + sizeof(outstr))
 323                 const char *flagstr;
 324
 325                 if (syserror(tcp))
 326                         return 0;
 327                 if (tcp->u_rval == 0) {
 328                         tcp->auxstr = "Timeout";
 329                         return RVAL_STR;
 330                 }
 331
 332                 nfds = tcp->u_arg[1];
 333                 size = sizeof(fds) * nfds;
 334                 start = tcp->u_arg[0];
 335                 end = start + size;
 336                 if (nfds == 0 || size / sizeof(fds) != nfds || end < start)
 337                         return 0;
 338                 if (abbrev(tcp)) {
 339                         abbrev_end = start + max_strlen * sizeof(fds);
 340                         if (abbrev_end < start)
 341                                 abbrev_end = end;
 342                 } else {
 343                         abbrev_end = end;
 344                 }
 345
 346                 outptr = outstr;
 347
 348                 for (cur = start; cur < end; cur += sizeof(fds)) {
 349                         if (umoven(tcp, cur, sizeof fds, (char *) &fds) < 0) {
 350                                 if (outptr < end_outstr - 2)
 351                                         *outptr++ = '?';
 352                                 failed = 1;
 353                                 break;
 354                         }
 355                         if (!fds.revents)
 356                                 continue;
 357                         if (outptr == outstr) {
 358                                 *outptr++ = '[';
 359                         } else {
 360                                 if (outptr < end_outstr - 3)
 361                                         outptr = stpcpy(outptr, ", ");
 362                         }
 363                         if (cur >= abbrev_end) {
 364                                 if (outptr < end_outstr - 4)
 365                                         outptr = stpcpy(outptr, "...");
 366                                 break;
 367                         }
 368                         if (outptr < end_outstr - (sizeof("{fd=%d, revents=") + sizeof(int)*3) + 1)
 369                                 outptr += sprintf(outptr, "{fd=%d, revents=", fds.fd);
 370                         flagstr = sprintflags("", pollflags, fds.revents);
 371                         if (outptr < end_outstr - (strlen(flagstr) + 2)) {
 372                                 outptr = stpcpy(outptr, flagstr);
 373                                 *outptr++ = '}';
 374                         }
 375                 }
 376                 if (failed)
 377                         return 0;
 378
 379                 if (outptr != outstr /* && outptr < end_outstr - 1 (always true)*/)
 380                         *outptr++ = ']';
 381
 382                 *outptr = '\0';
 383                 if (pts) {
 384                         if (outptr < end_outstr - (10 + TIMESPEC_TEXT_BUFSIZE)) {
 385                                 outptr = stpcpy(outptr, outptr == outstr ? "left " : ", left ");
 386                                 sprint_timespec(outptr, tcp, pts);
 387                         }
 388                 }
 389
 390                 if (outptr == outstr)
 391                         return 0;
 392
 393                 tcp->auxstr = outstr;
 394                 return RVAL_STR;
 395 #undef end_outstr
 396         }
 397 }
 398
 399 int
 400 sys_poll(struct tcb *tcp)
 401 {
 402         int rc = decode_poll(tcp, 0);
 403         if (entering(tcp)) {
 404 #ifdef INFTIM
 405                 if (tcp->u_arg[2] == INFTIM)
 406                         tprints("INFTIM");
 407                 else
 408 #endif
 409                         tprintf("%ld", tcp->u_arg[2]);
 410         }
 411         return rc;
 412 }
 413
 414 int
 415 sys_ppoll(struct tcb *tcp)
 416 {
 417         int rc = decode_poll(tcp, tcp->u_arg[2]);
 418         if (entering(tcp)) {
 419                 print_timespec(tcp, tcp->u_arg[2]);
 420                 tprints(", ");
 421                 print_sigset(tcp, tcp->u_arg[3], 0);
 422                 tprintf(", %lu", tcp->u_arg[4]);
 423         }
 424         return rc;
 425 }
 426
 427 #else /* !HAVE_SYS_POLL_H */
 428 int
 429 sys_poll(struct tcb *tcp)
 430 {
 431         return 0;
 432 }
 433 #endif