git.m6w6.name Git - awesomized/libmemcached/blob - libtest/cmdline.cc

   1 /*  vim:expandtab:shiftwidth=2:tabstop=2:smarttab:
   2  *
   3  *  Data Differential YATL (i.e. libtest)  library
   4  *
   5  *  Copyright (C) 2012-2013 Data Differential, http://datadifferential.com/
   6  *
   7  *  Redistribution and use in source and binary forms, with or without
   8  *  modification, are permitted provided that the following conditions are
   9  *  met:
  10  *
  11  *      * Redistributions of source code must retain the above copyright
  12  *  notice, this list of conditions and the following disclaimer.
  13  *
  14  *      * Redistributions in binary form must reproduce the above
  15  *  copyright notice, this list of conditions and the following disclaimer
  16  *  in the documentation and/or other materials provided with the
  17  *  distribution.
  18  *
  19  *      * The names of its contributors may not be used to endorse or
  20  *  promote products derived from this software without specific prior
  21  *  written permission.
  22  *
  23  *  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  24  *  "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  25  *  LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  26  *  A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  27  *  OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  28  *  SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  29  *  LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  30  *  DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  31  *  THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  32  *  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  33  *  OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  34  *
  35  */
  36
  37 #include "libtest/yatlcon.h"
  38
  39 #include "libtest/common.h"
  40
  41 using namespace libtest;
  42
  43 #include <cstdlib>
  44 #include <cstring>
  45 #include <cerrno>
  46 #include <fcntl.h>
  47 #include <fstream>
  48 #include <memory>
  49 #ifdef HAVE_POLL_H
  50 # include <poll.h>
  51 #endif
  52 #ifdef HAVE_SPAWN_H
  53 # include <spawn.h>
  54 #endif
  55 #include <sstream>
  56 #include <string>
  57 #include <sys/stat.h>
  58 #include <sys/types.h>
  59 #include <unistd.h>
  60
  61 #include <algorithm>
  62 #include <stdexcept>
  63
  64 #ifndef __USE_GNU
  65 static char **environ= NULL;
  66 #endif
  67
  68 #ifndef FD_CLOEXEC
  69 # define FD_CLOEXEC 0
  70 #endif
  71
  72 namespace {
  73
  74   std::string print_argv(libtest::vchar_ptr_t& built_argv)
  75   {
  76     std::stringstream arg_buffer;
  77
  78     for (vchar_ptr_t::iterator iter= built_argv.begin();
  79          iter != built_argv.end();
  80          ++iter)
  81     {
  82       arg_buffer << *iter << " ";
  83     }
  84
  85     return arg_buffer.str();
  86   }
  87
  88 #if 0
  89   std::string print_argv(char** argv)
  90   {
  91     std::stringstream arg_buffer;
  92
  93     for (char** ptr= argv; *ptr; ++ptr)
  94     {
  95       arg_buffer << *ptr << " ";
  96     }
  97
  98     return arg_buffer.str();
  99   }
 100 #endif
 101
 102   static Application::error_t int_to_error_t(int arg)
 103   {
 104     switch (arg)
 105     {
 106     case 127:
 107       return Application::INVALID_POSIX_SPAWN;
 108
 109     case 0:
 110       return Application::SUCCESS;
 111
 112     case 1:
 113       return Application::FAILURE;
 114
 115     default:
 116       return Application::UNKNOWN;
 117     }
 118   }
 119 }
 120
 121 namespace libtest {
 122
 123 Application::Application(const std::string& arg, const bool _use_libtool_arg) :
 124   _use_libtool(_use_libtool_arg),
 125   _use_valgrind(false),
 126   _use_gdb(false),
 127   _use_ptrcheck(false),
 128   _will_fail(false),
 129   _argc(0),
 130   _exectuble(arg),
 131   stdin_fd(STDIN_FILENO),
 132   stdout_fd(STDOUT_FILENO),
 133   stderr_fd(STDERR_FILENO),
 134   _pid(-1),
 135   _status(0),
 136   _app_exit_state(UNINITIALIZED)
 137   {
 138     if (_use_libtool)
 139     {
 140       if (libtool() == NULL)
 141       {
 142         FATAL("libtool requested, but know libtool was found");
 143       }
 144     }
 145
 146     // Find just the name of the application with no path
 147     {
 148       size_t found= arg.find_last_of("/\\");
 149       if (found)
 150       {
 151         _exectuble_name= arg.substr(found +1);
 152       }
 153       else
 154       {
 155         _exectuble_name= arg;
 156       }
 157     }
 158
 159     if (_use_libtool and getenv("PWD"))
 160     {
 161       _exectuble_with_path+= getenv("PWD");
 162       _exectuble_with_path+= "/";
 163     }
 164     _exectuble_with_path+= _exectuble;
 165   }
 166
 167 Application::~Application()
 168 {
 169   murder();
 170   delete_argv();
 171 }
 172
 173 Application::error_t Application::run(const char *args[])
 174 {
 175   stdin_fd.reset();
 176   stdout_fd.reset();
 177   stderr_fd.reset();
 178   _stdout_buffer.clear();
 179   _stderr_buffer.clear();
 180
 181   posix_spawn_file_actions_t file_actions;
 182   posix_spawn_file_actions_init(&file_actions);
 183
 184   stdin_fd.dup_for_spawn(file_actions);
 185   stdout_fd.dup_for_spawn(file_actions);
 186   stderr_fd.dup_for_spawn(file_actions);
 187
 188   posix_spawnattr_t spawnattr;
 189   posix_spawnattr_init(&spawnattr);
 190
 191   short flags= 0;
 192
 193   // Child should not block signals
 194   flags |= POSIX_SPAWN_SETSIGMASK;
 195
 196   sigset_t mask;
 197   sigemptyset(&mask);
 198
 199   fatal_assert(posix_spawnattr_setsigmask(&spawnattr, &mask) == 0);
 200
 201 #if defined(POSIX_SPAWN_USEVFORK) || defined(__linux__)
 202   // Use USEVFORK on linux
 203   flags |= POSIX_SPAWN_USEVFORK;
 204 #endif
 205
 206   flags |= POSIX_SPAWN_SETPGROUP;
 207   fatal_assert(posix_spawnattr_setpgroup(&spawnattr, 0) == 0);
 208
 209   fatal_assert(posix_spawnattr_setflags(&spawnattr, flags) == 0);
 210
 211   create_argv(args);
 212
 213   int spawn_ret;
 214   if (_use_gdb)
 215   {
 216     std::string gdb_run_file= create_tmpfile(_exectuble_name);
 217     std::fstream file_stream;
 218     file_stream.open(gdb_run_file.c_str(), std::fstream::out | std::fstream::trunc);
 219
 220     _gdb_filename= create_tmpfile(_exectuble_name);
 221     file_stream
 222       << "set logging redirect on" << std::endl
 223       << "set logging file " << _gdb_filename << std::endl
 224       << "set logging overwrite on" << std::endl
 225       << "set logging on" << std::endl
 226       << "set environment LIBTEST_IN_GDB=1" << std::endl
 227       << "run " << arguments() << std::endl
 228       << "thread apply all bt" << std::endl
 229       << "quit" << std::endl;
 230
 231     fatal_assert(file_stream.good());
 232     file_stream.close();
 233
 234     if (_use_libtool)
 235     {
 236       // libtool --mode=execute gdb -f -x binary
 237       char *argv[]= {
 238         const_cast<char *>(libtool()),
 239         const_cast<char *>("--mode=execute"),
 240         const_cast<char *>("gdb"),
 241         const_cast<char *>("-batch"),
 242         const_cast<char *>("-f"),
 243         const_cast<char *>("-x"),
 244         const_cast<char *>(gdb_run_file.c_str()),
 245         const_cast<char *>(_exectuble_with_path.c_str()),
 246         0};
 247
 248       spawn_ret= posix_spawnp(&_pid, libtool(), &file_actions, &spawnattr, argv, environ);
 249     }
 250     else
 251     {
 252       // gdb binary
 253       char *argv[]= {
 254         const_cast<char *>("gdb"),
 255         const_cast<char *>("-batch"),
 256         const_cast<char *>("-f"),
 257         const_cast<char *>("-x"),
 258         const_cast<char *>(gdb_run_file.c_str()),
 259         const_cast<char *>(_exectuble_with_path.c_str()),
 260         0};
 261       spawn_ret= posix_spawnp(&_pid, "gdb", &file_actions, &spawnattr, argv, environ);
 262     }
 263   }
 264   else
 265   {
 266     spawn_ret= posix_spawn(&_pid, built_argv[0], &file_actions, &spawnattr, &built_argv[0], NULL);
 267   }
 268
 269   posix_spawn_file_actions_destroy(&file_actions);
 270   posix_spawnattr_destroy(&spawnattr);
 271
 272   stdin_fd.close(Application::Pipe::READ);
 273   stdout_fd.close(Application::Pipe::WRITE);
 274   stderr_fd.close(Application::Pipe::WRITE);
 275
 276   if (spawn_ret != 0)
 277   {
 278     if (_will_fail == false)
 279     {
 280       Error << strerror(spawn_ret) << "(" << spawn_ret << ")";
 281     }
 282     _pid= -1;
 283     return Application::INVALID_POSIX_SPAWN;
 284   }
 285
 286   assert(_pid != -1);
 287   if (_pid == -1)
 288   {
 289     return Application::INVALID_POSIX_SPAWN;
 290   }
 291
 292 #if 0
 293   app_thread_st* _app_thread= new app_thread_st(_pid, _status, built_argv[0], _app_exit_state);
 294   int error;
 295   if ((error= pthread_create(&_thread, NULL, &app_thread, _app_thread)) != 0)
 296   {
 297     Error << "pthread_create() died during pthread_create(" << strerror(error) << ")";
 298     return Application::FAILURE;
 299   }
 300 #endif
 301
 302   return Application::SUCCESS;
 303 }
 304
 305 bool Application::check() const
 306 {
 307   if (_pid > 1 and kill(_pid, 0) == 0)
 308   {
 309     return true;
 310   }
 311
 312   return false;
 313 }
 314
 315 void Application::murder()
 316 {
 317   if (check())
 318   {
 319     int count= 5;
 320     while ((count--) > 0 and check())
 321     {
 322       if (kill(_pid, SIGTERM) == 0)
 323       {
 324         join();
 325       }
 326       else
 327       {
 328         Error << "kill(pid, SIGTERM) failed after kill with error of " << strerror(errno);
 329         continue;
 330       }
 331
 332       break;
 333     }
 334
 335     // If for whatever reason it lives, kill it hard
 336     if (check())
 337     {
 338       Error << "using SIGKILL, things will likely go poorly from this point";
 339       (void)kill(_pid, SIGKILL);
 340     }
 341   }
 342   slurp();
 343 }
 344
 345 // false means that no data was returned
 346 bool Application::slurp()
 347 {
 348   struct pollfd fds[2];
 349   fds[0].fd= stdout_fd.fd();
 350   fds[0].events= POLLRDNORM;
 351   fds[0].revents= 0;
 352   fds[1].fd= stderr_fd.fd();
 353   fds[1].events= POLLRDNORM;
 354   fds[1].revents= 0;
 355
 356   int active_fd;
 357   if ((active_fd= poll(fds, 2, 0)) == -1)
 358   {
 359     int error;
 360     switch ((error= errno))
 361     {
 362 #ifdef TARGET_OS_LINUX
 363     case ERESTART:
 364 #endif
 365     case EINTR:
 366       break;
 367
 368     case EFAULT:
 369     case ENOMEM:
 370       FATAL(strerror(error));
 371       break;
 372
 373     case EINVAL:
 374       FATAL("RLIMIT_NOFILE exceeded, or if OSX the timeout value was invalid");
 375       break;
 376
 377     default:
 378       FATAL(strerror(error));
 379       break;
 380     }
 381
 382     return false;
 383   }
 384
 385   if (active_fd == 0)
 386   {
 387     return false;
 388   }
 389
 390   bool data_was_read= false;
 391   if (fds[0].revents & POLLRDNORM)
 392   {
 393     if (stdout_fd.read(_stdout_buffer) == true)
 394     {
 395       data_was_read= true;
 396     }
 397   }
 398
 399   if (fds[1].revents & POLLRDNORM)
 400   {
 401     if (stderr_fd.read(_stderr_buffer) == true)
 402     {
 403       data_was_read= true;
 404     }
 405   }
 406
 407   return data_was_read;
 408 }
 409
 410 Application::error_t Application::join()
 411 {
 412   pid_t waited_pid= waitpid(_pid, &_status, WUNTRACED);
 413   slurp();
 414   if (waited_pid == _pid and WIFEXITED(_status) == false)
 415   {
 416     /*
 417       What we are looking for here is how the exit status happened.
 418       - 127 means that posix_spawn() itself had an error.
 419       - If WEXITSTATUS is positive we need to see if it is a signal that we sent to kill the process. If not something bad happened in the process itself.
 420       - Finally something has happened that we don't currently understand.
 421     */
 422     if (WEXITSTATUS(_status) == 127)
 423     {
 424       _app_exit_state= Application::INVALID_POSIX_SPAWN;
 425       std::string error_string("posix_spawn() failed pid:");
 426       error_string+= _pid;
 427       error_string+= " name:";
 428       error_string+= print_argv(built_argv);
 429       if (stderr_result_length())
 430       {
 431         error_string+= " stderr: ";
 432         error_string+= stderr_c_str();
 433       }
 434       throw std::logic_error(error_string);
 435     }
 436     else if (WIFSIGNALED(_status))
 437     {
 438       if (WTERMSIG(_status) != SIGTERM and WTERMSIG(_status) != SIGHUP)
 439       {
 440         slurp();
 441         _app_exit_state= Application::INVALID_POSIX_SPAWN;
 442         std::string error_string(print_argv(built_argv));
 443         error_string+= " was killed by signal ";
 444         error_string+= strsignal(WTERMSIG(_status));
 445
 446         if (stdout_result_length())
 447         {
 448           error_string+= " stdout: ";
 449           error_string+= stdout_c_str();
 450         }
 451
 452         if (stderr_result_length())
 453         {
 454           error_string+= " stderr: ";
 455           error_string+= stderr_c_str();
 456         }
 457
 458         throw std::runtime_error(error_string);
 459       }
 460
 461       // If we terminted it on purpose then it counts as a success.
 462 #if defined(DEBUG)
 463       if (DEBUG)
 464       {
 465         Out << "waitpid() application terminated at request"
 466           << " pid:" << _pid
 467           << " name:" << built_argv[0];
 468       }
 469 #endif
 470     }
 471     else
 472     {
 473       _app_exit_state= Application::UNKNOWN;
 474       Error << "Unknown logic state at exit:" << WEXITSTATUS(_status)
 475         << " pid:" << _pid
 476         << " name:" << built_argv[0];
 477     }
 478   }
 479   else if (waited_pid == _pid and WIFEXITED(_status))
 480   {
 481     _app_exit_state= int_to_error_t(WEXITSTATUS(_status));
 482   }
 483   else if (waited_pid == -1)
 484   {
 485     std::string error_string;
 486     if (stdout_result_length())
 487     {
 488       error_string+= " stdout: ";
 489       error_string+= stdout_c_str();
 490     }
 491
 492     if (stderr_result_length())
 493     {
 494       error_string+= " stderr: ";
 495       error_string+= stderr_c_str();
 496     }
 497     Error << "waitpid() returned errno:" << strerror(errno) << " " << error_string;
 498     _app_exit_state= Application::UNKNOWN;
 499   }
 500   else
 501   {
 502     _app_exit_state= Application::UNKNOWN;
 503     throw std::logic_error("waitpid() returned an unknown value");
 504   }
 505
 506   return _app_exit_state;
 507 }
 508
 509 void Application::add_long_option(const std::string& name, const std::string& option_value)
 510 {
 511   std::string arg(name);
 512   arg+= option_value;
 513   _options.push_back(std::make_pair(arg, std::string()));
 514 }
 515
 516 void Application::add_option(const std::string& arg)
 517 {
 518   _options.push_back(std::make_pair(arg, std::string()));
 519 }
 520
 521 void Application::add_option(const std::string& name, const std::string& value)
 522 {
 523   _options.push_back(std::make_pair(name, value));
 524 }
 525
 526 Application::Pipe::Pipe(int arg) :
 527   _std_fd(arg)
 528 {
 529   _pipe_fd[READ]= -1;
 530   _pipe_fd[WRITE]= -1;
 531   _open[READ]= false;
 532   _open[WRITE]= false;
 533 }
 534
 535 int Application::Pipe::Pipe::fd()
 536 {
 537   if (_std_fd == STDOUT_FILENO)
 538   {
 539     return _pipe_fd[READ];
 540   }
 541   else if (_std_fd == STDERR_FILENO)
 542   {
 543     return _pipe_fd[READ];
 544   }
 545
 546   return _pipe_fd[WRITE]; // STDIN_FILENO
 547 }
 548
 549
 550 bool Application::Pipe::read(libtest::vchar_t& arg)
 551 {
 552   fatal_assert(_std_fd == STDOUT_FILENO or _std_fd == STDERR_FILENO);
 553
 554   bool data_was_read= false;
 555
 556   libtest::vchar_t buffer;
 557   buffer.resize(1024);
 558   ssize_t read_length;
 559   while ((read_length= ::read(_pipe_fd[READ], &buffer[0], buffer.size())))
 560   {
 561     if (read_length == -1)
 562     {
 563       switch(errno)
 564       {
 565       case EAGAIN:
 566         break;
 567
 568       default:
 569         Error << strerror(errno);
 570         break;
 571       }
 572
 573       break;
 574     }
 575
 576     data_was_read= true;
 577     arg.reserve(read_length +1);
 578     for (size_t x= 0; x < size_t(read_length); ++x)
 579     {
 580       arg.push_back(buffer[x]);
 581     }
 582     // @todo Suck up all errput code here
 583   }
 584
 585   return data_was_read;
 586 }
 587
 588 void Application::Pipe::nonblock()
 589 {
 590   int flags;
 591   do
 592   {
 593     flags= fcntl(_pipe_fd[READ], F_GETFL, 0);
 594   } while (flags == -1 and (errno == EINTR or errno == EAGAIN));
 595
 596   if (flags == -1)
 597   {
 598     Error << "fcntl(F_GETFL) " << strerror(errno);
 599     throw strerror(errno);
 600   }
 601
 602   int rval;
 603   do
 604   {
 605     rval= fcntl(_pipe_fd[READ], F_SETFL, flags | O_NONBLOCK);
 606   } while (rval == -1 and (errno == EINTR or errno == EAGAIN));
 607
 608   if (rval == -1)
 609   {
 610     Error << "fcntl(F_SETFL) " << strerror(errno);
 611     throw strerror(errno);
 612   }
 613 }
 614
 615 void Application::Pipe::reset()
 616 {
 617   close(READ);
 618   close(WRITE);
 619
 620 #ifdef HAVE_PIPE2
 621   if (pipe2(_pipe_fd, O_NONBLOCK|O_CLOEXEC) == -1)
 622 #endif
 623   {
 624     if (pipe(_pipe_fd) == -1)
 625     {
 626       FATAL(strerror(errno));
 627     }
 628
 629     // Since either pipe2() was not found/called we set the pipe directly
 630     nonblock();
 631     cloexec();
 632   }
 633   _open[0]= true;
 634   _open[1]= true;
 635 }
 636
 637 void Application::Pipe::cloexec()
 638 {
 639   //if (SOCK_CLOEXEC == 0)
 640   {
 641     if (FD_CLOEXEC)
 642     {
 643       int flags;
 644       do
 645       {
 646         flags= fcntl(_pipe_fd[WRITE], F_GETFD, 0);
 647       } while (flags == -1 and (errno == EINTR or errno == EAGAIN));
 648
 649       if (flags == -1)
 650       {
 651         Error << "fcntl(F_GETFD) " << strerror(errno);
 652         throw strerror(errno);
 653       }
 654
 655       int rval;
 656       do
 657       {
 658         rval= fcntl(_pipe_fd[WRITE], F_SETFD, flags | FD_CLOEXEC);
 659       } while (rval == -1 && (errno == EINTR or errno == EAGAIN));
 660
 661       if (rval == -1)
 662       {
 663         Error << "fcntl(F_SETFD) " << strerror(errno);
 664         throw strerror(errno);
 665       }
 666     }
 667   }
 668 }
 669
 670 Application::Pipe::~Pipe()
 671 {
 672   if (_pipe_fd[0] != -1)
 673   {
 674     ::close(_pipe_fd[0]);
 675   }
 676
 677   if (_pipe_fd[1] != -1)
 678   {
 679     ::close(_pipe_fd[1]);
 680   }
 681 }
 682
 683 void Application::Pipe::dup_for_spawn(posix_spawn_file_actions_t& file_actions)
 684 {
 685   int type= STDIN_FILENO == _std_fd ? 0 : 1;
 686
 687   int ret;
 688   if ((ret= posix_spawn_file_actions_adddup2(&file_actions, _pipe_fd[type], _std_fd )) < 0)
 689   {
 690     FATAL("posix_spawn_file_actions_adddup2(%s)", strerror(ret));
 691   }
 692
 693   if ((ret= posix_spawn_file_actions_addclose(&file_actions, _pipe_fd[type])) < 0)
 694   {
 695     FATAL("posix_spawn_file_actions_addclose(%s)", strerror(ret));
 696   }
 697 }
 698
 699 void Application::Pipe::close(const close_t& arg)
 700 {
 701   int type= int(arg);
 702
 703   if (_open[type])
 704   {
 705     if (::close(_pipe_fd[type]) == -1)
 706     {
 707       Error << "close(" << strerror(errno) << ")";
 708     }
 709     _open[type]= false;
 710     _pipe_fd[type]= -1;
 711   }
 712 }
 713
 714 void Application::create_argv(const char *args[])
 715 {
 716   delete_argv();
 717   if (_use_libtool)
 718   {
 719     assert(libtool());
 720     vchar::append(built_argv, libtool());
 721     vchar::append(built_argv, "--mode=execute");
 722   }
 723
 724   if (_use_valgrind)
 725   {
 726     /*
 727       valgrind --error-exitcode=1 --leak-check=yes --track-fds=yes --malloc-fill=A5 --free-fill=DE
 728     */
 729     vchar::append(built_argv, "valgrind");
 730     vchar::append(built_argv, "--error-exitcode=1");
 731     vchar::append(built_argv, "--leak-check=yes");
 732 #if 0
 733     vchar::append(built_argv, "--show-reachable=yes"));
 734 #endif
 735     vchar::append(built_argv, "--track-fds=yes");
 736 #if 0
 737     built_argv[x++]= strdup("--track-origin=yes");
 738 #endif
 739     vchar::append(built_argv, "--malloc-fill=A5");
 740     vchar::append(built_argv, "--free-fill=DE");
 741
 742     std::string log_file= create_tmpfile("valgrind");
 743     libtest::vchar_t buffer;
 744     buffer.resize(1024);
 745     int length= snprintf(&buffer[0], buffer.size(), "--log-file=%s", log_file.c_str());
 746     fatal_assert(length > 0 and size_t(length) < buffer.size());
 747     vchar::append(built_argv, &buffer[0]);
 748   }
 749   else if (_use_ptrcheck)
 750   {
 751     /*
 752       valgrind --error-exitcode=1 --tool=exp-ptrcheck --log-file=
 753     */
 754     vchar::append(built_argv, "valgrind");
 755     vchar::append(built_argv, "--error-exitcode=1");
 756     vchar::append(built_argv, "--tool=exp-ptrcheck");
 757     std::string log_file= create_tmpfile("ptrcheck");
 758     libtest::vchar_t buffer;
 759     buffer.resize(1024);
 760     int length= snprintf(&buffer[0], buffer.size(), "--log-file=%s", log_file.c_str());
 761     fatal_assert(length > 0 and size_t(length) < buffer.size());
 762     vchar::append(built_argv, &buffer[0]);
 763   }
 764   else if (_use_gdb)
 765   {
 766     vchar::append(built_argv, "gdb");
 767   }
 768
 769   vchar::append(built_argv, _exectuble_with_path.c_str());
 770
 771   for (Options::const_iterator iter= _options.begin(); iter != _options.end(); ++iter)
 772   {
 773     vchar::append(built_argv, (*iter).first.c_str());
 774     if ((*iter).second.empty() == false)
 775     {
 776       vchar::append(built_argv, (*iter).second.c_str());
 777     }
 778   }
 779
 780   if (args)
 781   {
 782     for (const char **ptr= args; *ptr; ++ptr)
 783     {
 784       vchar::append(built_argv, *ptr);
 785     }
 786   }
 787   built_argv.push_back(NULL);
 788 }
 789
 790 std::string Application::print()
 791 {
 792   return print_argv(built_argv);
 793 }
 794
 795 std::string Application::arguments()
 796 {
 797   std::stringstream arg_buffer;
 798
 799   // Skip printing out the libtool reference
 800   for (size_t x= _use_libtool ? 2 : 0; x < _argc; ++x)
 801   {
 802     if (built_argv[x])
 803     {
 804       arg_buffer << built_argv[x] << " ";
 805     }
 806   }
 807
 808   return arg_buffer.str();
 809 }
 810
 811 void Application::delete_argv()
 812 {
 813   std::for_each(built_argv.begin(), built_argv.end(), FreeFromVector());
 814
 815   built_argv.clear();
 816   _argc= 0;
 817 }
 818
 819
 820 int exec_cmdline(const std::string& command, const char *args[], bool use_libtool)
 821 {
 822   Application app(command, use_libtool);
 823
 824   Application::error_t ret= app.run(args);
 825
 826   if (ret != Application::SUCCESS)
 827   {
 828     return int(ret);
 829   }
 830
 831   return int(app.join());
 832 }
 833
 834 } // namespace exec_cmdline