1 /*
   2  * Copyright (c) 1997, 2011, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *
  23  */
  24 
  25 #include "precompiled.hpp"
  26 #include "compiler/compileLog.hpp"
  27 #include "oops/oop.inline.hpp"
  28 #include "runtime/arguments.hpp"
  29 #include "utilities/defaultStream.hpp"
  30 #include "utilities/ostream.hpp"
  31 #include "utilities/top.hpp"
  32 #include "utilities/xmlstream.hpp"
  33 #ifdef TARGET_OS_FAMILY_linux
  34 # include "os_linux.inline.hpp"
  35 #endif
  36 #ifdef TARGET_OS_FAMILY_solaris
  37 # include "os_solaris.inline.hpp"
  38 #endif
  39 #ifdef TARGET_OS_FAMILY_windows
  40 # include "os_windows.inline.hpp"
  41 #endif
  42 
  43 extern "C" void jio_print(const char* s); // Declarationtion of jvm method
  44 
  45 outputStream::outputStream(int width) {
  46   _width       = width;
  47   _position    = 0;
  48   _newlines    = 0;
  49   _precount    = 0;
  50   _indentation = 0;
  51 }
  52 
  53 outputStream::outputStream(int width, bool has_time_stamps) {
  54   _width       = width;
  55   _position    = 0;
  56   _newlines    = 0;
  57   _precount    = 0;
  58   _indentation = 0;
  59   if (has_time_stamps)  _stamp.update();
  60 }
  61 
  62 void outputStream::update_position(const char* s, size_t len) {
  63   for (size_t i = 0; i < len; i++) {
  64     char ch = s[i];
  65     if (ch == '\n') {
  66       _newlines += 1;
  67       _precount += _position + 1;
  68       _position = 0;
  69     } else if (ch == '\t') {
  70       int tw = 8 - (_position & 7);
  71       _position += tw;
  72       _precount -= tw-1;  // invariant:  _precount + _position == total count
  73     } else {
  74       _position += 1;
  75     }
  76   }
  77 }
  78 
  79 // Execute a vsprintf, using the given buffer if necessary.
  80 // Return a pointer to the formatted string.
  81 const char* outputStream::do_vsnprintf(char* buffer, size_t buflen,
  82                                        const char* format, va_list ap,
  83                                        bool add_cr,
  84                                        size_t& result_len) {
  85   const char* result;
  86   if (add_cr)  buflen--;
  87   if (!strchr(format, '%')) {
  88     // constant format string
  89     result = format;
  90     result_len = strlen(result);
  91     if (add_cr && result_len >= buflen)  result_len = buflen-1;  // truncate
  92   } else if (format[0] == '%' && format[1] == 's' && format[2] == '\0') {
  93     // trivial copy-through format string
  94     result = va_arg(ap, const char*);
  95     result_len = strlen(result);
  96     if (add_cr && result_len >= buflen)  result_len = buflen-1;  // truncate
  97   } else if (vsnprintf(buffer, buflen, format, ap) >= 0) {
  98     result = buffer;
  99     result_len = strlen(result);
 100   } else {
 101     DEBUG_ONLY(warning("increase O_BUFLEN in ostream.hpp -- output truncated");)
 102     result = buffer;
 103     result_len = buflen - 1;
 104     buffer[result_len] = 0;
 105   }
 106   if (add_cr) {
 107     if (result != buffer) {
 108       strncpy(buffer, result, buflen);
 109       result = buffer;
 110     }
 111     buffer[result_len++] = '\n';
 112     buffer[result_len] = 0;
 113   }
 114   return result;
 115 }
 116 
 117 void outputStream::print(const char* format, ...) {
 118   char buffer[O_BUFLEN];
 119   va_list ap;
 120   va_start(ap, format);
 121   size_t len;
 122   const char* str = do_vsnprintf(buffer, O_BUFLEN, format, ap, false, len);
 123   write(str, len);
 124   va_end(ap);
 125 }
 126 
 127 void outputStream::print_cr(const char* format, ...) {
 128   char buffer[O_BUFLEN];
 129   va_list ap;
 130   va_start(ap, format);
 131   size_t len;
 132   const char* str = do_vsnprintf(buffer, O_BUFLEN, format, ap, true, len);
 133   write(str, len);
 134   va_end(ap);
 135 }
 136 
 137 void outputStream::vprint(const char *format, va_list argptr) {
 138   char buffer[O_BUFLEN];
 139   size_t len;
 140   const char* str = do_vsnprintf(buffer, O_BUFLEN, format, argptr, false, len);
 141   write(str, len);
 142 }
 143 
 144 void outputStream::vprint_cr(const char* format, va_list argptr) {
 145   char buffer[O_BUFLEN];
 146   size_t len;
 147   const char* str = do_vsnprintf(buffer, O_BUFLEN, format, argptr, true, len);
 148   write(str, len);
 149 }
 150 
 151 void outputStream::fill_to(int col) {
 152   int need_fill = col - position();
 153   sp(need_fill);
 154 }
 155 
 156 void outputStream::move_to(int col, int slop, int min_space) {
 157   if (position() >= col + slop)
 158     cr();
 159   int need_fill = col - position();
 160   if (need_fill < min_space)
 161     need_fill = min_space;
 162   sp(need_fill);
 163 }
 164 
 165 void outputStream::put(char ch) {
 166   assert(ch != 0, "please fix call site");
 167   char buf[] = { ch, '\0' };
 168   write(buf, 1);
 169 }
 170 
 171 #define SP_USE_TABS false
 172 
 173 void outputStream::sp(int count) {
 174   if (count < 0)  return;
 175   if (SP_USE_TABS && count >= 8) {
 176     int target = position() + count;
 177     while (count >= 8) {
 178       this->write("\t", 1);
 179       count -= 8;
 180     }
 181     count = target - position();
 182   }
 183   while (count > 0) {
 184     int nw = (count > 8) ? 8 : count;
 185     this->write("        ", nw);
 186     count -= nw;
 187   }
 188 }
 189 
 190 void outputStream::cr() {
 191   this->write("\n", 1);
 192 }
 193 
 194 void outputStream::stamp() {
 195   if (! _stamp.is_updated()) {
 196     _stamp.update(); // start at 0 on first call to stamp()
 197   }
 198 
 199   // outputStream::stamp() may get called by ostream_abort(), use snprintf
 200   // to avoid allocating large stack buffer in print().
 201   char buf[40];
 202   jio_snprintf(buf, sizeof(buf), "%.3f", _stamp.seconds());
 203   print_raw(buf);
 204 }
 205 
 206 void outputStream::stamp(bool guard,
 207                          const char* prefix,
 208                          const char* suffix) {
 209   if (!guard) {
 210     return;
 211   }
 212   print_raw(prefix);
 213   stamp();
 214   print_raw(suffix);
 215 }
 216 
 217 void outputStream::date_stamp(bool guard,
 218                               const char* prefix,
 219                               const char* suffix) {
 220   if (!guard) {
 221     return;
 222   }
 223   print_raw(prefix);
 224   static const char error_time[] = "yyyy-mm-ddThh:mm:ss.mmm+zzzz";
 225   static const int buffer_length = 32;
 226   char buffer[buffer_length];
 227   const char* iso8601_result = os::iso8601_time(buffer, buffer_length);
 228   if (iso8601_result != NULL) {
 229     print_raw(buffer);
 230   } else {
 231     print_raw(error_time);
 232   }
 233   print_raw(suffix);
 234   return;
 235 }
 236 
 237 void outputStream::indent() {
 238   while (_position < _indentation) sp();
 239 }
 240 
 241 void outputStream::print_jlong(jlong value) {
 242   // N.B. Same as INT64_FORMAT
 243   print(os::jlong_format_specifier(), value);
 244 }
 245 
 246 void outputStream::print_julong(julong value) {
 247   // N.B. Same as UINT64_FORMAT
 248   print(os::julong_format_specifier(), value);
 249 }
 250 
 251 stringStream::stringStream(size_t initial_size) : outputStream() {
 252   buffer_length = initial_size;
 253   buffer        = NEW_RESOURCE_ARRAY(char, buffer_length);
 254   buffer_pos    = 0;
 255   buffer_fixed  = false;
 256 }
 257 
 258 // useful for output to fixed chunks of memory, such as performance counters
 259 stringStream::stringStream(char* fixed_buffer, size_t fixed_buffer_size) : outputStream() {
 260   buffer_length = fixed_buffer_size;
 261   buffer        = fixed_buffer;
 262   buffer_pos    = 0;
 263   buffer_fixed  = true;
 264 }
 265 
 266 void stringStream::write(const char* s, size_t len) {
 267   size_t write_len = len;               // number of non-null bytes to write
 268   size_t end = buffer_pos + len + 1;    // position after write and final '\0'
 269   if (end > buffer_length) {
 270     if (buffer_fixed) {
 271       // if buffer cannot resize, silently truncate
 272       end = buffer_length;
 273       write_len = end - buffer_pos - 1; // leave room for the final '\0'
 274     } else {
 275       // For small overruns, double the buffer.  For larger ones,
 276       // increase to the requested size.
 277       if (end < buffer_length * 2) {
 278         end = buffer_length * 2;
 279       }
 280       char* oldbuf = buffer;
 281       buffer = NEW_RESOURCE_ARRAY(char, end);
 282       strncpy(buffer, oldbuf, buffer_pos);
 283       buffer_length = end;
 284     }
 285   }
 286   // invariant: buffer is always null-terminated
 287   guarantee(buffer_pos + write_len + 1 <= buffer_length, "stringStream oob");
 288   buffer[buffer_pos + write_len] = 0;
 289   strncpy(buffer + buffer_pos, s, write_len);
 290   buffer_pos += write_len;
 291 
 292   // Note that the following does not depend on write_len.
 293   // This means that position and count get updated
 294   // even when overflow occurs.
 295   update_position(s, len);
 296 }
 297 
 298 char* stringStream::as_string() {
 299   char* copy = NEW_RESOURCE_ARRAY(char, buffer_pos+1);
 300   strncpy(copy, buffer, buffer_pos);
 301   copy[buffer_pos] = 0;  // terminating null
 302   return copy;
 303 }
 304 
 305 stringStream::~stringStream() {}
 306 
 307 xmlStream*   xtty;
 308 outputStream* tty;
 309 outputStream* gclog_or_tty;
 310 extern Mutex* tty_lock;
 311 
 312 fileStream::fileStream(const char* file_name) {
 313   _file = fopen(file_name, "w");
 314   _need_close = true;
 315 }
 316 
 317 fileStream::fileStream(const char* file_name, const char* opentype) {
 318   _file = fopen(file_name, opentype);
 319   _need_close = true;
 320 }
 321 
 322 void fileStream::write(const char* s, size_t len) {
 323   if (_file != NULL)  {
 324     // Make an unused local variable to avoid warning from gcc 4.x compiler.
 325     size_t count = fwrite(s, 1, len, _file);
 326   }
 327   update_position(s, len);
 328 }
 329 
 330 long fileStream::fileSize() {
 331   long size = -1;
 332   if (_file != NULL) {
 333     long pos  = ::ftell(_file);
 334     if (::fseek(_file, 0, SEEK_END) == 0) {
 335       size = ::ftell(_file);
 336     }
 337     ::fseek(_file, pos, SEEK_SET);
 338   }
 339   return size;
 340 }
 341 
 342 char* fileStream::readln(char *data, int count ) {
 343   char * ret = ::fgets(data, count, _file);
 344   //Get rid of annoying \n char
 345   data[::strlen(data)-1] = '\0';
 346   return ret;
 347 }
 348 
 349 fileStream::~fileStream() {
 350   if (_file != NULL) {
 351     if (_need_close) fclose(_file);
 352     _file = NULL;
 353   }
 354 }
 355 
 356 void fileStream::flush() {
 357   fflush(_file);
 358 }
 359 
 360 fdStream::fdStream(const char* file_name) {
 361   _fd = open(file_name, O_WRONLY | O_CREAT | O_TRUNC, 0666);
 362   _need_close = true;
 363 }
 364 
 365 fdStream::~fdStream() {
 366   if (_fd != -1) {
 367     if (_need_close) close(_fd);
 368     _fd = -1;
 369   }
 370 }
 371 
 372 void fdStream::write(const char* s, size_t len) {
 373   if (_fd != -1) {
 374     // Make an unused local variable to avoid warning from gcc 4.x compiler.
 375     size_t count = ::write(_fd, s, (int)len);
 376   }
 377   update_position(s, len);
 378 }
 379 
 380 defaultStream* defaultStream::instance = NULL;
 381 int defaultStream::_output_fd = 1;
 382 int defaultStream::_error_fd  = 2;
 383 FILE* defaultStream::_output_stream = stdout;
 384 FILE* defaultStream::_error_stream  = stderr;
 385 
 386 #define LOG_MAJOR_VERSION 160
 387 #define LOG_MINOR_VERSION 1
 388 
 389 void defaultStream::init() {
 390   _inited = true;
 391   if (LogVMOutput || LogCompilation) {
 392     init_log();
 393   }
 394 }
 395 
 396 bool defaultStream::has_log_file() {
 397   // lazily create log file (at startup, LogVMOutput is false even
 398   // if +LogVMOutput is used, because the flags haven't been parsed yet)
 399   // For safer printing during fatal error handling, do not init logfile
 400   // if a VM error has been reported.
 401   if (!_inited && !is_error_reported())  init();
 402   return _log_file != NULL;
 403 }
 404 
 405 static const char* make_log_name(const char* log_name, const char* force_directory) {
 406   const char* basename = log_name;
 407   char file_sep = os::file_separator()[0];
 408   const char* cp;
 409   for (cp = log_name; *cp != '\0'; cp++) {
 410     if (*cp == '/' || *cp == file_sep) {
 411       basename = cp+1;
 412     }
 413   }
 414   const char* nametail = log_name;
 415 
 416   // Compute buffer length
 417   size_t buffer_length;
 418   if (force_directory != NULL) {
 419     buffer_length = strlen(force_directory) + strlen(os::file_separator()) +
 420                     strlen(basename) + 1;
 421   } else {
 422     buffer_length = strlen(log_name) + 1;
 423   }
 424 
 425   const char* star = strchr(basename, '*');
 426   int star_pos = (star == NULL) ? -1 : (star - nametail);
 427   int skip = 1;
 428   if (star == NULL) {
 429     // Try %p
 430     star = strstr(basename, "%p");
 431     if (star != NULL) {
 432       skip = 2;
 433     }
 434   }
 435   star_pos = (star == NULL) ? -1 : (star - nametail);
 436 
 437   char pid[32];
 438   if (star_pos >= 0) {
 439     jio_snprintf(pid, sizeof(pid), "%u", os::current_process_id());
 440     buffer_length += strlen(pid);
 441   }
 442 
 443   // Create big enough buffer.
 444   char *buf = NEW_C_HEAP_ARRAY(char, buffer_length);
 445 
 446   strcpy(buf, "");
 447   if (force_directory != NULL) {
 448     strcat(buf, force_directory);
 449     strcat(buf, os::file_separator());
 450     nametail = basename;       // completely skip directory prefix
 451   }
 452 
 453   if (star_pos >= 0) {
 454     // convert foo*bar.log or foo%pbar.log to foo123bar.log
 455     int buf_pos = (int) strlen(buf);
 456     strncpy(&buf[buf_pos], nametail, star_pos);
 457     strcpy(&buf[buf_pos + star_pos], pid);
 458     nametail += star_pos + skip;  // skip prefix and pid format
 459   }
 460 
 461   strcat(buf, nametail);      // append rest of name, or all of name
 462   return buf;
 463 }
 464 
 465 void defaultStream::init_log() {
 466   // %%% Need a MutexLocker?
 467   const char* log_name = LogFile != NULL ? LogFile : "hotspot.log";
 468   const char* try_name = make_log_name(log_name, NULL);
 469   fileStream* file = new(ResourceObj::C_HEAP) fileStream(try_name);
 470   if (!file->is_open()) {
 471     // Try again to open the file.
 472     char warnbuf[O_BUFLEN*2];
 473     jio_snprintf(warnbuf, sizeof(warnbuf),
 474                  "Warning:  Cannot open log file: %s\n", try_name);
 475     // Note:  This feature is for maintainer use only.  No need for L10N.
 476     jio_print(warnbuf);
 477     FREE_C_HEAP_ARRAY(char, try_name);
 478     try_name = make_log_name("hs_pid%p.log", os::get_temp_directory());
 479     jio_snprintf(warnbuf, sizeof(warnbuf),
 480                  "Warning:  Forcing option -XX:LogFile=%s\n", try_name);
 481     jio_print(warnbuf);
 482     delete file;
 483     file = new(ResourceObj::C_HEAP) fileStream(try_name);
 484     FREE_C_HEAP_ARRAY(char, try_name);
 485   }
 486   if (file->is_open()) {
 487     _log_file = file;
 488     xmlStream* xs = new(ResourceObj::C_HEAP) xmlStream(file);
 489     _outer_xmlStream = xs;
 490     if (this == tty)  xtty = xs;
 491     // Write XML header.
 492     xs->print_cr("<?xml version='1.0' encoding='UTF-8'?>");
 493     // (For now, don't bother to issue a DTD for this private format.)
 494     jlong time_ms = os::javaTimeMillis() - tty->time_stamp().milliseconds();
 495     // %%% Should be: jlong time_ms = os::start_time_milliseconds(), if
 496     // we ever get round to introduce that method on the os class
 497     xs->head("hotspot_log version='%d %d'"
 498              " process='%d' time_ms='"INT64_FORMAT"'",
 499              LOG_MAJOR_VERSION, LOG_MINOR_VERSION,
 500              os::current_process_id(), time_ms);
 501     // Write VM version header immediately.
 502     xs->head("vm_version");
 503     xs->head("name"); xs->text("%s", VM_Version::vm_name()); xs->cr();
 504     xs->tail("name");
 505     xs->head("release"); xs->text("%s", VM_Version::vm_release()); xs->cr();
 506     xs->tail("release");
 507     xs->head("info"); xs->text("%s", VM_Version::internal_vm_info_string()); xs->cr();
 508     xs->tail("info");
 509     xs->tail("vm_version");
 510     // Record information about the command-line invocation.
 511     xs->head("vm_arguments");  // Cf. Arguments::print_on()
 512     if (Arguments::num_jvm_flags() > 0) {
 513       xs->head("flags");
 514       Arguments::print_jvm_flags_on(xs->text());
 515       xs->tail("flags");
 516     }
 517     if (Arguments::num_jvm_args() > 0) {
 518       xs->head("args");
 519       Arguments::print_jvm_args_on(xs->text());
 520       xs->tail("args");
 521     }
 522     if (Arguments::java_command() != NULL) {
 523       xs->head("command"); xs->text()->print_cr("%s", Arguments::java_command());
 524       xs->tail("command");
 525     }
 526     if (Arguments::sun_java_launcher() != NULL) {
 527       xs->head("launcher"); xs->text()->print_cr("%s", Arguments::sun_java_launcher());
 528       xs->tail("launcher");
 529     }
 530     if (Arguments::system_properties() !=  NULL) {
 531       xs->head("properties");
 532       // Print it as a java-style property list.
 533       // System properties don't generally contain newlines, so don't bother with unparsing.
 534       for (SystemProperty* p = Arguments::system_properties(); p != NULL; p = p->next()) {
 535         xs->text()->print_cr("%s=%s", p->key(), p->value());
 536       }
 537       xs->tail("properties");
 538     }
 539     xs->tail("vm_arguments");
 540     // tty output per se is grouped under the <tty>...</tty> element.
 541     xs->head("tty");
 542     // All further non-markup text gets copied to the tty:
 543     xs->_text = this;  // requires friend declaration!
 544   } else {
 545     delete(file);
 546     // and leave xtty as NULL
 547     LogVMOutput = false;
 548     DisplayVMOutput = true;
 549     LogCompilation = false;
 550   }
 551 }
 552 
 553 // finish_log() is called during normal VM shutdown. finish_log_on_error() is
 554 // called by ostream_abort() after a fatal error.
 555 //
 556 void defaultStream::finish_log() {
 557   xmlStream* xs = _outer_xmlStream;
 558   xs->done("tty");
 559 
 560   // Other log forks are appended here, at the End of Time:
 561   CompileLog::finish_log(xs->out());  // write compile logging, if any, now
 562 
 563   xs->done("hotspot_log");
 564   xs->flush();
 565 
 566   fileStream* file = _log_file;
 567   _log_file = NULL;
 568 
 569   delete _outer_xmlStream;
 570   _outer_xmlStream = NULL;
 571 
 572   file->flush();
 573   delete file;
 574 }
 575 
 576 void defaultStream::finish_log_on_error(char *buf, int buflen) {
 577   xmlStream* xs = _outer_xmlStream;
 578 
 579   if (xs && xs->out()) {
 580 
 581     xs->done_raw("tty");
 582 
 583     // Other log forks are appended here, at the End of Time:
 584     CompileLog::finish_log_on_error(xs->out(), buf, buflen);  // write compile logging, if any, now
 585 
 586     xs->done_raw("hotspot_log");
 587     xs->flush();
 588 
 589     fileStream* file = _log_file;
 590     _log_file = NULL;
 591     _outer_xmlStream = NULL;
 592 
 593     if (file) {
 594       file->flush();
 595 
 596       // Can't delete or close the file because delete and fclose aren't
 597       // async-safe. We are about to die, so leave it to the kernel.
 598       // delete file;
 599     }
 600   }
 601 }
 602 
 603 intx defaultStream::hold(intx writer_id) {
 604   bool has_log = has_log_file();  // check before locking
 605   if (// impossible, but who knows?
 606       writer_id == NO_WRITER ||
 607 
 608       // bootstrap problem
 609       tty_lock == NULL ||
 610 
 611       // can't grab a lock or call Thread::current() if TLS isn't initialized
 612       ThreadLocalStorage::thread() == NULL ||
 613 
 614       // developer hook
 615       !SerializeVMOutput ||
 616 
 617       // VM already unhealthy
 618       is_error_reported() ||
 619 
 620       // safepoint == global lock (for VM only)
 621       (SafepointSynchronize::is_synchronizing() &&
 622        Thread::current()->is_VM_thread())
 623       ) {
 624     // do not attempt to lock unless we know the thread and the VM is healthy
 625     return NO_WRITER;
 626   }
 627   if (_writer == writer_id) {
 628     // already held, no need to re-grab the lock
 629     return NO_WRITER;
 630   }
 631   tty_lock->lock_without_safepoint_check();
 632   // got the lock
 633   if (writer_id != _last_writer) {
 634     if (has_log) {
 635       _log_file->bol();
 636       // output a hint where this output is coming from:
 637       _log_file->print_cr("<writer thread='"INTX_FORMAT"'/>", writer_id);
 638     }
 639     _last_writer = writer_id;
 640   }
 641   _writer = writer_id;
 642   return writer_id;
 643 }
 644 
 645 void defaultStream::release(intx holder) {
 646   if (holder == NO_WRITER) {
 647     // nothing to release:  either a recursive lock, or we scribbled (too bad)
 648     return;
 649   }
 650   if (_writer != holder) {
 651     return;  // already unlocked, perhaps via break_tty_lock_for_safepoint
 652   }
 653   _writer = NO_WRITER;
 654   tty_lock->unlock();
 655 }
 656 
 657 
 658 // Yuck:  jio_print does not accept char*/len.
 659 static void call_jio_print(const char* s, size_t len) {
 660   char buffer[O_BUFLEN+100];
 661   if (len > sizeof(buffer)-1) {
 662     warning("increase O_BUFLEN in ostream.cpp -- output truncated");
 663     len = sizeof(buffer)-1;
 664   }
 665   strncpy(buffer, s, len);
 666   buffer[len] = '\0';
 667   jio_print(buffer);
 668 }
 669 
 670 
 671 void defaultStream::write(const char* s, size_t len) {
 672   intx thread_id = os::current_thread_id();
 673   intx holder = hold(thread_id);
 674 
 675   if (DisplayVMOutput &&
 676       (_outer_xmlStream == NULL || !_outer_xmlStream->inside_attrs())) {
 677     // print to output stream. It can be redirected by a vfprintf hook
 678     if (s[len] == '\0') {
 679       jio_print(s);
 680     } else {
 681       call_jio_print(s, len);
 682     }
 683   }
 684 
 685   // print to log file
 686   if (has_log_file()) {
 687     int nl0 = _newlines;
 688     xmlTextStream::write(s, len);
 689     // flush the log file too, if there were any newlines
 690     if (nl0 != _newlines){
 691       flush();
 692     }
 693   } else {
 694     update_position(s, len);
 695   }
 696 
 697   release(holder);
 698 }
 699 
 700 intx ttyLocker::hold_tty() {
 701   if (defaultStream::instance == NULL)  return defaultStream::NO_WRITER;
 702   intx thread_id = os::current_thread_id();
 703   return defaultStream::instance->hold(thread_id);
 704 }
 705 
 706 void ttyLocker::release_tty(intx holder) {
 707   if (holder == defaultStream::NO_WRITER)  return;
 708   defaultStream::instance->release(holder);
 709 }
 710 
 711 bool ttyLocker::release_tty_if_locked() {
 712   intx thread_id = os::current_thread_id();
 713   if (defaultStream::instance->writer() == thread_id) {
 714     // release the lock and return true so callers know if was
 715     // previously held.
 716     release_tty(thread_id);
 717     return true;
 718   }
 719   return false;
 720 }
 721 
 722 void ttyLocker::break_tty_lock_for_safepoint(intx holder) {
 723   if (defaultStream::instance != NULL &&
 724       defaultStream::instance->writer() == holder) {
 725     if (xtty != NULL) {
 726       xtty->print_cr("<!-- safepoint while printing -->");
 727     }
 728     defaultStream::instance->release(holder);
 729   }
 730   // (else there was no lock to break)
 731 }
 732 
 733 void ostream_init() {
 734   if (defaultStream::instance == NULL) {
 735     defaultStream::instance = new(ResourceObj::C_HEAP) defaultStream();
 736     tty = defaultStream::instance;
 737 
 738     // We want to ensure that time stamps in GC logs consider time 0
 739     // the time when the JVM is initialized, not the first time we ask
 740     // for a time stamp. So, here, we explicitly update the time stamp
 741     // of tty.
 742     tty->time_stamp().update_to(1);
 743   }
 744 }
 745 
 746 void ostream_init_log() {
 747   // For -Xloggc:<file> option - called in runtime/thread.cpp
 748   // Note : this must be called AFTER ostream_init()
 749 
 750   gclog_or_tty = tty; // default to tty
 751   if (Arguments::gc_log_filename() != NULL) {
 752     fileStream * gclog = new(ResourceObj::C_HEAP)
 753                            fileStream(Arguments::gc_log_filename());
 754     if (gclog->is_open()) {
 755       // now we update the time stamp of the GC log to be synced up
 756       // with tty.
 757       gclog->time_stamp().update_to(tty->time_stamp().ticks());
 758       gclog_or_tty = gclog;
 759     }
 760   }
 761 
 762   // If we haven't lazily initialized the logfile yet, do it now,
 763   // to avoid the possibility of lazy initialization during a VM
 764   // crash, which can affect the stability of the fatal error handler.
 765   defaultStream::instance->has_log_file();
 766 }
 767 
 768 // ostream_exit() is called during normal VM exit to finish log files, flush
 769 // output and free resource.
 770 void ostream_exit() {
 771   static bool ostream_exit_called = false;
 772   if (ostream_exit_called)  return;
 773   ostream_exit_called = true;
 774   if (gclog_or_tty != tty) {
 775       delete gclog_or_tty;
 776   }
 777   {
 778       // we temporaly disable PrintMallocFree here
 779       // as otherwise it'll lead to using of almost deleted
 780       // tty or defaultStream::instance in logging facility
 781       // of HeapFree(), see 6391258
 782       DEBUG_ONLY(FlagSetting fs(PrintMallocFree, false);)
 783       if (tty != defaultStream::instance) {
 784           delete tty;
 785       }
 786       if (defaultStream::instance != NULL) {
 787           delete defaultStream::instance;
 788       }
 789   }
 790   tty = NULL;
 791   xtty = NULL;
 792   gclog_or_tty = NULL;
 793   defaultStream::instance = NULL;
 794 }
 795 
 796 // ostream_abort() is called by os::abort() when VM is about to die.
 797 void ostream_abort() {
 798   // Here we can't delete gclog_or_tty and tty, just flush their output
 799   if (gclog_or_tty) gclog_or_tty->flush();
 800   if (tty) tty->flush();
 801 
 802   if (defaultStream::instance != NULL) {
 803     static char buf[4096];
 804     defaultStream::instance->finish_log_on_error(buf, sizeof(buf));
 805   }
 806 }
 807 
 808 staticBufferStream::staticBufferStream(char* buffer, size_t buflen,
 809                                        outputStream *outer_stream) {
 810   _buffer = buffer;
 811   _buflen = buflen;
 812   _outer_stream = outer_stream;
 813 }
 814 
 815 void staticBufferStream::write(const char* c, size_t len) {
 816   _outer_stream->print_raw(c, (int)len);
 817 }
 818 
 819 void staticBufferStream::flush() {
 820   _outer_stream->flush();
 821 }
 822 
 823 void staticBufferStream::print(const char* format, ...) {
 824   va_list ap;
 825   va_start(ap, format);
 826   size_t len;
 827   const char* str = do_vsnprintf(_buffer, _buflen, format, ap, false, len);
 828   write(str, len);
 829   va_end(ap);
 830 }
 831 
 832 void staticBufferStream::print_cr(const char* format, ...) {
 833   va_list ap;
 834   va_start(ap, format);
 835   size_t len;
 836   const char* str = do_vsnprintf(_buffer, _buflen, format, ap, true, len);
 837   write(str, len);
 838   va_end(ap);
 839 }
 840 
 841 void staticBufferStream::vprint(const char *format, va_list argptr) {
 842   size_t len;
 843   const char* str = do_vsnprintf(_buffer, _buflen, format, argptr, false, len);
 844   write(str, len);
 845 }
 846 
 847 void staticBufferStream::vprint_cr(const char* format, va_list argptr) {
 848   size_t len;
 849   const char* str = do_vsnprintf(_buffer, _buflen, format, argptr, true, len);
 850   write(str, len);
 851 }
 852 
 853 bufferedStream::bufferedStream(size_t initial_size, size_t bufmax) : outputStream() {
 854   buffer_length = initial_size;
 855   buffer        = NEW_C_HEAP_ARRAY(char, buffer_length);
 856   buffer_pos    = 0;
 857   buffer_fixed  = false;
 858   buffer_max    = bufmax;
 859 }
 860 
 861 bufferedStream::bufferedStream(char* fixed_buffer, size_t fixed_buffer_size, size_t bufmax) : outputStream() {
 862   buffer_length = fixed_buffer_size;
 863   buffer        = fixed_buffer;
 864   buffer_pos    = 0;
 865   buffer_fixed  = true;
 866   buffer_max    = bufmax;
 867 }
 868 
 869 void bufferedStream::write(const char* s, size_t len) {
 870 
 871   if(buffer_pos + len > buffer_max) {
 872     flush();
 873   }
 874 
 875   size_t end = buffer_pos + len;
 876   if (end >= buffer_length) {
 877     if (buffer_fixed) {
 878       // if buffer cannot resize, silently truncate
 879       len = buffer_length - buffer_pos - 1;
 880     } else {
 881       // For small overruns, double the buffer.  For larger ones,
 882       // increase to the requested size.
 883       if (end < buffer_length * 2) {
 884         end = buffer_length * 2;
 885       }
 886       buffer = REALLOC_C_HEAP_ARRAY(char, buffer, end);
 887       buffer_length = end;
 888     }
 889   }
 890   memcpy(buffer + buffer_pos, s, len);
 891   buffer_pos += len;
 892   update_position(s, len);
 893 }
 894 
 895 char* bufferedStream::as_string() {
 896   char* copy = NEW_RESOURCE_ARRAY(char, buffer_pos+1);
 897   strncpy(copy, buffer, buffer_pos);
 898   copy[buffer_pos] = 0;  // terminating null
 899   return copy;
 900 }
 901 
 902 bufferedStream::~bufferedStream() {
 903   if (!buffer_fixed) {
 904     FREE_C_HEAP_ARRAY(char, buffer);
 905   }
 906 }
 907 
 908 #ifndef PRODUCT
 909 
 910 #if defined(SOLARIS) || defined(LINUX)
 911 #include <sys/types.h>
 912 #include <sys/socket.h>
 913 #include <netinet/in.h>
 914 #include <arpa/inet.h>
 915 #endif
 916 
 917 // Network access
 918 networkStream::networkStream() : bufferedStream(1024*10, 1024*10) {
 919 
 920   _socket = -1;
 921 
 922   int result = os::socket(AF_INET, SOCK_STREAM, 0);
 923   if (result <= 0) {
 924     assert(false, "Socket could not be created!");
 925   } else {
 926     _socket = result;
 927   }
 928 }
 929 
 930 int networkStream::read(char *buf, size_t len) {
 931   return os::recv(_socket, buf, (int)len, 0);
 932 }
 933 
 934 void networkStream::flush() {
 935   if (size() != 0) {
 936     int result = os::raw_send(_socket, (char *)base(), (int)size(), 0);
 937     assert(result != -1, "connection error");
 938     assert(result == (int)size(), "didn't send enough data");
 939   }
 940   reset();
 941 }
 942 
 943 networkStream::~networkStream() {
 944   close();
 945 }
 946 
 947 void networkStream::close() {
 948   if (_socket != -1) {
 949     flush();
 950     os::socket_close(_socket);
 951     _socket = -1;
 952   }
 953 }
 954 
 955 bool networkStream::connect(const char *ip, short port) {
 956 
 957   struct sockaddr_in server;
 958   server.sin_family = AF_INET;
 959   server.sin_port = htons(port);
 960 
 961   server.sin_addr.s_addr = inet_addr(ip);
 962   if (server.sin_addr.s_addr == (uint32_t)-1) {
 963     struct hostent* host = os::get_host_by_name((char*)ip);
 964     if (host != NULL) {
 965       memcpy(&server.sin_addr, host->h_addr_list[0], host->h_length);
 966     } else {
 967       return false;
 968     }
 969   }
 970 
 971 
 972   int result = os::connect(_socket, (struct sockaddr*)&server, sizeof(struct sockaddr_in));
 973   return (result >= 0);
 974 }
 975 
 976 #endif