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 int
  90 sys_putmsg(struct tcb *tcp)
  91 {
  92         int i;
  93
  94         if (entering(tcp)) {
  95                 /* fd */
  96                 tprintf("%ld, ", tcp->u_arg[0]);
  97                 /* control and data */
  98                 for (i = 1; i < 3; i++)
  99                         printstrbufarg(tcp, tcp->u_arg[i], 0);
 100                 /* flags */
 101                 printflags(msgflags, tcp->u_arg[3], "RS_???");
 102         }
 103         return 0;
 104 }
 105
 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
 152 # if defined SYS_putpmsg || defined SYS_getpmsg
 153 #include "xlat/pmsgflags.h"
 154 #  ifdef SYS_putpmsg
 155 int
 156 sys_putpmsg(struct tcb *tcp)
 157 {
 158         int i;
 159
 160         if (entering(tcp)) {
 161                 /* fd */
 162                 tprintf("%ld, ", tcp->u_arg[0]);
 163                 /* control and data */
 164                 for (i = 1; i < 3; i++)
 165                         printstrbufarg(tcp, tcp->u_arg[i], 0);
 166                 /* band */
 167                 tprintf("%ld, ", tcp->u_arg[3]);
 168                 /* flags */
 169                 printflags(pmsgflags, tcp->u_arg[4], "MSG_???");
 170         }
 171         return 0;
 172 }
 173 #  endif
 174 #  ifdef SYS_getpmsg
 175 int
 176 sys_getpmsg(struct tcb *tcp)
 177 {
 178         int i, flags;
 179
 180         if (entering(tcp)) {
 181                 /* fd */
 182                 tprintf("%lu, ", tcp->u_arg[0]);
 183         } else {
 184                 if (syserror(tcp)) {
 185                         tprintf("%#lx, %#lx, %#lx, %#lx", tcp->u_arg[1],
 186                                 tcp->u_arg[2], tcp->u_arg[3], tcp->u_arg[4]);
 187                         return 0;
 188                 }
 189                 /* control and data */
 190                 for (i = 1; i < 3; i++)
 191                         printstrbufarg(tcp, tcp->u_arg[i], 1);
 192                 /* pointer to band */
 193                 printnum(tcp, tcp->u_arg[3], "%d");
 194                 tprints(", ");
 195                 /* pointer to flags */
 196                 if (tcp->u_arg[4] == 0)
 197                         tprints("NULL");
 198                 else if (umove(tcp, tcp->u_arg[4], &flags) < 0)
 199                         tprints("[?]");
 200                 else {
 201                         tprints("[");
 202                         printflags(pmsgflags, flags, "MSG_???");
 203                         tprints("]");
 204                 }
 205                 /* decode return value */
 206                 switch (tcp->u_rval) {
 207                 case MORECTL:
 208                         tcp->auxstr = "MORECTL";
 209                         break;
 210                 case MORECTL|MOREDATA:
 211                         tcp->auxstr = "MORECTL|MOREDATA";
 212                         break;
 213                 case MOREDATA:
 214                         tcp->auxstr = "MORECTL";
 215                         break;
 216                 default:
 217                         tcp->auxstr = NULL;
 218                         break;
 219                 }
 220         }
 221         return RVAL_HEX | RVAL_STR;
 222 }
 223 #  endif
 224 # endif /* getpmsg/putpmsg */
 225
 226 #endif /* STREAMS syscalls support */
 227
 228
 229 #ifdef HAVE_SYS_POLL_H
 230
 231 #include "xlat/pollflags.h"
 232
 233 static int
 234 decode_poll(struct tcb *tcp, long pts)
 235 {
 236         struct pollfd fds;
 237         unsigned nfds;
 238         unsigned long size, start, cur, end, abbrev_end;
 239         int failed = 0;
 240
 241         if (entering(tcp)) {
 242                 nfds = tcp->u_arg[1];
 243                 size = sizeof(fds) * nfds;
 244                 start = tcp->u_arg[0];
 245                 end = start + size;
 246                 if (nfds == 0 || size / sizeof(fds) != nfds || end < start) {
 247                         tprintf("%#lx, %d, ",
 248                                 tcp->u_arg[0], nfds);
 249                         return 0;
 250                 }
 251                 if (abbrev(tcp)) {
 252                         abbrev_end = start + max_strlen * sizeof(fds);
 253                         if (abbrev_end < start)
 254                                 abbrev_end = end;
 255                 } else {
 256                         abbrev_end = end;
 257                 }
 258                 tprints("[");
 259                 for (cur = start; cur < end; cur += sizeof(fds)) {
 260                         if (cur > start)
 261                                 tprints(", ");
 262                         if (cur >= abbrev_end) {
 263                                 tprints("...");
 264                                 break;
 265                         }
 266                         if (umoven(tcp, cur, sizeof fds, (char *) &fds) < 0) {
 267                                 tprints("?");
 268                                 failed = 1;
 269                                 break;
 270                         }
 271                         if (fds.fd < 0) {
 272                                 tprintf("{fd=%d}", fds.fd);
 273                                 continue;
 274                         }
 275                         tprints("{fd=");
 276                         printfd(tcp, fds.fd);
 277                         tprints(", events=");
 278                         printflags(pollflags, fds.events, "POLL???");
 279                         tprints("}");
 280                 }
 281                 tprints("]");
 282                 if (failed)
 283                         tprintf(" %#lx", start);
 284                 tprintf(", %d, ", nfds);
 285                 return 0;
 286         } else {
 287                 static char outstr[1024];
 288                 char *outptr;
 289 #define end_outstr (outstr + sizeof(outstr))
 290                 const char *flagstr;
 291
 292                 if (syserror(tcp))
 293                         return 0;
 294                 if (tcp->u_rval == 0) {
 295                         tcp->auxstr = "Timeout";
 296                         return RVAL_STR;
 297                 }
 298
 299                 nfds = tcp->u_arg[1];
 300                 size = sizeof(fds) * nfds;
 301                 start = tcp->u_arg[0];
 302                 end = start + size;
 303                 if (nfds == 0 || size / sizeof(fds) != nfds || end < start)
 304                         return 0;
 305                 if (abbrev(tcp)) {
 306                         abbrev_end = start + max_strlen * sizeof(fds);
 307                         if (abbrev_end < start)
 308                                 abbrev_end = end;
 309                 } else {
 310                         abbrev_end = end;
 311                 }
 312
 313                 outptr = outstr;
 314
 315                 for (cur = start; cur < end; cur += sizeof(fds)) {
 316                         if (umoven(tcp, cur, sizeof fds, (char *) &fds) < 0) {
 317                                 if (outptr < end_outstr - 2)
 318                                         *outptr++ = '?';
 319                                 failed = 1;
 320                                 break;
 321                         }
 322                         if (!fds.revents)
 323                                 continue;
 324                         if (outptr == outstr) {
 325                                 *outptr++ = '[';
 326                         } else {
 327                                 if (outptr < end_outstr - 3)
 328                                         outptr = stpcpy(outptr, ", ");
 329                         }
 330                         if (cur >= abbrev_end) {
 331                                 if (outptr < end_outstr - 4)
 332                                         outptr = stpcpy(outptr, "...");
 333                                 break;
 334                         }
 335                         if (outptr < end_outstr - (sizeof("{fd=%d, revents=") + sizeof(int)*3) + 1)
 336                                 outptr += sprintf(outptr, "{fd=%d, revents=", fds.fd);
 337                         flagstr = sprintflags("", pollflags, fds.revents);
 338                         if (outptr < end_outstr - (strlen(flagstr) + 2)) {
 339                                 outptr = stpcpy(outptr, flagstr);
 340                                 *outptr++ = '}';
 341                         }
 342                 }
 343                 if (failed)
 344                         return 0;
 345
 346                 if (outptr != outstr /* && outptr < end_outstr - 1 (always true)*/)
 347                         *outptr++ = ']';
 348
 349                 *outptr = '\0';
 350                 if (pts) {
 351                         if (outptr < end_outstr - (10 + TIMESPEC_TEXT_BUFSIZE)) {
 352                                 outptr = stpcpy(outptr, outptr == outstr ? "left " : ", left ");
 353                                 sprint_timespec(outptr, tcp, pts);
 354                         }
 355                 }
 356
 357                 if (outptr == outstr)
 358                         return 0;
 359
 360                 tcp->auxstr = outstr;
 361                 return RVAL_STR;
 362 #undef end_outstr
 363         }
 364 }
 365
 366 int
 367 sys_poll(struct tcb *tcp)
 368 {
 369         int rc = decode_poll(tcp, 0);
 370         if (entering(tcp)) {
 371 # ifdef INFTIM
 372                 if (tcp->u_arg[2] == INFTIM)
 373                         tprints("INFTIM");
 374                 else
 375 # endif
 376                         tprintf("%ld", tcp->u_arg[2]);
 377         }
 378         return rc;
 379 }
 380
 381 int
 382 sys_ppoll(struct tcb *tcp)
 383 {
 384         int rc = decode_poll(tcp, tcp->u_arg[2]);
 385         if (entering(tcp)) {
 386                 print_timespec(tcp, tcp->u_arg[2]);
 387                 tprints(", ");
 388                 /* NB: kernel requires arg[4] == NSIG / 8 */
 389                 print_sigset_addr_len(tcp, tcp->u_arg[3], tcp->u_arg[4]);
 390                 tprintf(", %lu", tcp->u_arg[4]);
 391         }
 392         return rc;
 393 }
 394
 395 #else /* !HAVE_SYS_POLL_H */
 396 int
 397 sys_poll(struct tcb *tcp)
 398 {
 399         return 0;
 400 }
 401 #endif