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 static const struct xlat msgflags[] = {
  59         XLAT(RS_HIPRI),
  60         XLAT_END
  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, long 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 int
 110 sys_getmsg(struct tcb *tcp)
 111 {
 112         int i, flags;
 113
 114         if (entering(tcp)) {
 115                 /* fd */
 116                 tprintf("%lu, ", tcp->u_arg[0]);
 117         } else {
 118                 if (syserror(tcp)) {
 119                         tprintf("%#lx, %#lx, %#lx",
 120                                 tcp->u_arg[1], tcp->u_arg[2], tcp->u_arg[3]);
 121                         return 0;
 122                 }
 123                 /* control and data */
 124                 for (i = 1; i < 3; i++)
 125                         printstrbufarg(tcp, tcp->u_arg[i], 1);
 126                 /* pointer to flags */
 127                 if (tcp->u_arg[3] == 0)
 128                         tprints("NULL");
 129                 else if (umove(tcp, tcp->u_arg[3], &flags) < 0)
 130                         tprints("[?]");
 131                 else {
 132                         tprints("[");
 133                         printflags(msgflags, flags, "RS_???");
 134                         tprints("]");
 135                 }
 136                 /* decode return value */
 137                 switch (tcp->u_rval) {
 138                 case MORECTL:
 139                         tcp->auxstr = "MORECTL";
 140                         break;
 141                 case MORECTL|MOREDATA:
 142                         tcp->auxstr = "MORECTL|MOREDATA";
 143                         break;
 144                 case MOREDATA:
 145                         tcp->auxstr = "MORECTL";
 146                         break;
 147                 default:
 148                         tcp->auxstr = NULL;
 149                         break;
 150                 }
 151         }
 152         return RVAL_HEX | RVAL_STR;
 153 }
 154
 155 # if defined SYS_putpmsg || defined SYS_getpmsg
 156 static const struct xlat pmsgflags[] = {
 157 #  ifdef MSG_HIPRI
 158         XLAT(MSG_HIPRI),
 159 #  endif
 160 #  ifdef MSG_AND
 161         XLAT(MSG_ANY),
 162 #  endif
 163 #  ifdef MSG_BAND
 164         XLAT(MSG_BAND),
 165 #  endif
 166         XLAT_END
 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
 188 #  ifdef SYS_getpmsg
 189 int
 190 sys_getpmsg(struct tcb *tcp)
 191 {
 192         int i, flags;
 193
 194         if (entering(tcp)) {
 195                 /* fd */
 196                 tprintf("%lu, ", tcp->u_arg[0]);
 197         } else {
 198                 if (syserror(tcp)) {
 199                         tprintf("%#lx, %#lx, %#lx, %#lx", tcp->u_arg[1],
 200                                 tcp->u_arg[2], tcp->u_arg[3], tcp->u_arg[4]);
 201                         return 0;
 202                 }
 203                 /* control and data */
 204                 for (i = 1; i < 3; i++)
 205                         printstrbufarg(tcp, tcp->u_arg[i], 1);
 206                 /* pointer to band */
 207                 printnum(tcp, tcp->u_arg[3], "%d");
 208                 tprints(", ");
 209                 /* pointer to flags */
 210                 if (tcp->u_arg[4] == 0)
 211                         tprints("NULL");
 212                 else if (umove(tcp, tcp->u_arg[4], &flags) < 0)
 213                         tprints("[?]");
 214                 else {
 215                         tprints("[");
 216                         printflags(pmsgflags, flags, "MSG_???");
 217                         tprints("]");
 218                 }
 219                 /* decode return value */
 220                 switch (tcp->u_rval) {
 221                 case MORECTL:
 222                         tcp->auxstr = "MORECTL";
 223                         break;
 224                 case MORECTL|MOREDATA:
 225                         tcp->auxstr = "MORECTL|MOREDATA";
 226                         break;
 227                 case MOREDATA:
 228                         tcp->auxstr = "MORECTL";
 229                         break;
 230                 default:
 231                         tcp->auxstr = NULL;
 232                         break;
 233                 }
 234         }
 235         return RVAL_HEX | RVAL_STR;
 236 }
 237 #  endif
 238 # endif /* getpmsg/putpmsg */
 239
 240 #endif /* STREAMS syscalls support */
 241
 242
 243 #ifdef HAVE_SYS_POLL_H
 244
 245 static const struct xlat pollflags[] = {
 246 # ifdef POLLIN
 247         XLAT(POLLIN),
 248         XLAT(POLLPRI),
 249         XLAT(POLLOUT),
 250 #  ifdef POLLRDNORM
 251         XLAT(POLLRDNORM),
 252 #  endif
 253 #  ifdef POLLWRNORM
 254         XLAT(POLLWRNORM),
 255 #  endif
 256 #  ifdef POLLRDBAND
 257         XLAT(POLLRDBAND),
 258 #  endif
 259 #  ifdef POLLWRBAND
 260         XLAT(POLLWRBAND),
 261 #  endif
 262         XLAT(POLLERR),
 263         XLAT(POLLHUP),
 264         XLAT(POLLNVAL),
 265 # endif
 266         XLAT_END
 267 };
 268
 269 static int
 270 decode_poll(struct tcb *tcp, long pts)
 271 {
 272         struct pollfd fds;
 273         unsigned nfds;
 274         unsigned long size, start, cur, end, abbrev_end;
 275         int failed = 0;
 276
 277         if (entering(tcp)) {
 278                 nfds = tcp->u_arg[1];
 279                 size = sizeof(fds) * nfds;
 280                 start = tcp->u_arg[0];
 281                 end = start + size;
 282                 if (nfds == 0 || size / sizeof(fds) != nfds || end < start) {
 283                         tprintf("%#lx, %d, ",
 284                                 tcp->u_arg[0], nfds);
 285                         return 0;
 286                 }
 287                 if (abbrev(tcp)) {
 288                         abbrev_end = start + max_strlen * sizeof(fds);
 289                         if (abbrev_end < start)
 290                                 abbrev_end = end;
 291                 } else {
 292                         abbrev_end = end;
 293                 }
 294                 tprints("[");
 295                 for (cur = start; cur < end; cur += sizeof(fds)) {
 296                         if (cur > start)
 297                                 tprints(", ");
 298                         if (cur >= abbrev_end) {
 299                                 tprints("...");
 300                                 break;
 301                         }
 302                         if (umoven(tcp, cur, sizeof fds, (char *) &fds) < 0) {
 303                                 tprints("?");
 304                                 failed = 1;
 305                                 break;
 306                         }
 307                         if (fds.fd < 0) {
 308                                 tprintf("{fd=%d}", fds.fd);
 309                                 continue;
 310                         }
 311                         tprints("{fd=");
 312                         printfd(tcp, fds.fd);
 313                         tprints(", events=");
 314                         printflags(pollflags, fds.events, "POLL???");
 315                         tprints("}");
 316                 }
 317                 tprints("]");
 318                 if (failed)
 319                         tprintf(" %#lx", start);
 320                 tprintf(", %d, ", nfds);
 321                 return 0;
 322         } else {
 323                 static char outstr[1024];
 324                 char *outptr;
 325 #define end_outstr (outstr + sizeof(outstr))
 326                 const char *flagstr;
 327
 328                 if (syserror(tcp))
 329                         return 0;
 330                 if (tcp->u_rval == 0) {
 331                         tcp->auxstr = "Timeout";
 332                         return RVAL_STR;
 333                 }
 334
 335                 nfds = tcp->u_arg[1];
 336                 size = sizeof(fds) * nfds;
 337                 start = tcp->u_arg[0];
 338                 end = start + size;
 339                 if (nfds == 0 || size / sizeof(fds) != nfds || end < start)
 340                         return 0;
 341                 if (abbrev(tcp)) {
 342                         abbrev_end = start + max_strlen * sizeof(fds);
 343                         if (abbrev_end < start)
 344                                 abbrev_end = end;
 345                 } else {
 346                         abbrev_end = end;
 347                 }
 348
 349                 outptr = outstr;
 350
 351                 for (cur = start; cur < end; cur += sizeof(fds)) {
 352                         if (umoven(tcp, cur, sizeof fds, (char *) &fds) < 0) {
 353                                 if (outptr < end_outstr - 2)
 354                                         *outptr++ = '?';
 355                                 failed = 1;
 356                                 break;
 357                         }
 358                         if (!fds.revents)
 359                                 continue;
 360                         if (outptr == outstr) {
 361                                 *outptr++ = '[';
 362                         } else {
 363                                 if (outptr < end_outstr - 3)
 364                                         outptr = stpcpy(outptr, ", ");
 365                         }
 366                         if (cur >= abbrev_end) {
 367                                 if (outptr < end_outstr - 4)
 368                                         outptr = stpcpy(outptr, "...");
 369                                 break;
 370                         }
 371                         if (outptr < end_outstr - (sizeof("{fd=%d, revents=") + sizeof(int)*3) + 1)
 372                                 outptr += sprintf(outptr, "{fd=%d, revents=", fds.fd);
 373                         flagstr = sprintflags("", pollflags, fds.revents);
 374                         if (outptr < end_outstr - (strlen(flagstr) + 2)) {
 375                                 outptr = stpcpy(outptr, flagstr);
 376                                 *outptr++ = '}';
 377                         }
 378                 }
 379                 if (failed)
 380                         return 0;
 381
 382                 if (outptr != outstr /* && outptr < end_outstr - 1 (always true)*/)
 383                         *outptr++ = ']';
 384
 385                 *outptr = '\0';
 386                 if (pts) {
 387                         if (outptr < end_outstr - (10 + TIMESPEC_TEXT_BUFSIZE)) {
 388                                 outptr = stpcpy(outptr, outptr == outstr ? "left " : ", left ");
 389                                 sprint_timespec(outptr, tcp, pts);
 390                         }
 391                 }
 392
 393                 if (outptr == outstr)
 394                         return 0;
 395
 396                 tcp->auxstr = outstr;
 397                 return RVAL_STR;
 398 #undef end_outstr
 399         }
 400 }
 401
 402 int
 403 sys_poll(struct tcb *tcp)
 404 {
 405         int rc = decode_poll(tcp, 0);
 406         if (entering(tcp)) {
 407 # ifdef INFTIM
 408                 if (tcp->u_arg[2] == INFTIM)
 409                         tprints("INFTIM");
 410                 else
 411 # endif
 412                         tprintf("%ld", tcp->u_arg[2]);
 413         }
 414         return rc;
 415 }
 416
 417 int
 418 sys_ppoll(struct tcb *tcp)
 419 {
 420         int rc = decode_poll(tcp, tcp->u_arg[2]);
 421         if (entering(tcp)) {
 422                 print_timespec(tcp, tcp->u_arg[2]);
 423                 tprints(", ");
 424                 /* NB: kernel requires arg[4] == NSIG / 8 */
 425                 print_sigset_addr_len(tcp, tcp->u_arg[3], tcp->u_arg[4]);
 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