src/unix/utilsunx.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        utilsunx.cpp
   3 // Purpose:     generic Unix implementation of many wx functions
   4 // Author:      Vadim Zeitlin
   5 // Id:          $Id$
   6 // Copyright:   (c) 1998 Robert Roebling, Vadim Zeitlin
   7 // Licence:     wxWindows licence
   8 /////////////////////////////////////////////////////////////////////////////
   9
  10 // ============================================================================
  11 // declarations
  12 // ============================================================================
  13
  14 // ----------------------------------------------------------------------------
  15 // headers
  16 // ----------------------------------------------------------------------------
  17
  18 #include "wx/defs.h"
  19 #include "wx/string.h"
  20
  21 #include "wx/intl.h"
  22 #include "wx/log.h"
  23 #include "wx/app.h"
  24
  25 #include "wx/utils.h"
  26 #include "wx/process.h"
  27 #include "wx/thread.h"
  28
  29 #include "wx/stream.h"
  30
  31 #ifdef HAVE_STATFS
  32     #include <sys/vfs.h>
  33 #endif // HAVE_STATFS
  34
  35 #if wxUSE_GUI
  36     #include "wx/unix/execute.h"
  37 #endif
  38
  39 // SGI signal.h defines signal handler arguments differently depending on
  40 // whether _LANGUAGE_C_PLUS_PLUS is set or not - do set it
  41 #if defined(__SGI__) && !defined(_LANGUAGE_C_PLUS_PLUS)
  42     #define _LANGUAGE_C_PLUS_PLUS 1
  43 #endif // SGI hack
  44
  45 #include <stdarg.h>
  46 #include <dirent.h>
  47 #include <string.h>
  48 #include <sys/stat.h>
  49 #include <sys/types.h>
  50 #include <unistd.h>
  51 #include <sys/wait.h>
  52 #include <pwd.h>
  53 #include <errno.h>
  54 #include <netdb.h>
  55 #include <signal.h>
  56 #include <fcntl.h>          // for O_WRONLY and friends
  57 #include <time.h>           // nanosleep() and/or usleep()
  58 #include <ctype.h>          // isspace()
  59 #include <sys/time.h>       // needed for FD_SETSIZE
  60
  61 #ifdef HAVE_UNAME
  62     #include <sys/utsname.h> // for uname()
  63 #endif // HAVE_UNAME
  64
  65 // ----------------------------------------------------------------------------
  66 // conditional compilation
  67 // ----------------------------------------------------------------------------
  68
  69 // many versions of Unices have this function, but it is not defined in system
  70 // headers - please add your system here if it is the case for your OS.
  71 // SunOS < 5.6 (i.e. Solaris < 2.6) and DG-UX are like this.
  72 #if !defined(HAVE_USLEEP) && \
  73     (defined(__SUN__) && !defined(__SunOs_5_6) && \
  74                          !defined(__SunOs_5_7) && !defined(__SUNPRO_CC)) || \
  75      defined(__osf__) || defined(__EMX__)
  76     extern "C"
  77     {
  78         #ifdef __SUN__
  79             int usleep(unsigned int usec);
  80         #else // !Sun
  81             #ifdef __EMX__
  82                 /* I copied this from the XFree86 diffs. AV. */
  83                 #define INCL_DOSPROCESS
  84                 #include <os2.h>
  85                 inline void usleep(unsigned long delay)
  86                 {
  87                     DosSleep(delay ? (delay/1000l) : 1l);
  88                 }
  89             #else // !Sun && !EMX
  90                 void usleep(unsigned long usec);
  91             #endif
  92         #endif // Sun/EMX/Something else
  93     };
  94
  95     #define HAVE_USLEEP 1
  96 #endif // Unices without usleep()
  97
  98 // ============================================================================
  99 // implementation
 100 // ============================================================================
 101
 102 // ----------------------------------------------------------------------------
 103 // sleeping
 104 // ----------------------------------------------------------------------------
 105
 106 void wxSleep(int nSecs)
 107 {
 108     sleep(nSecs);
 109 }
 110
 111 void wxUsleep(unsigned long milliseconds)
 112 {
 113 #if defined(HAVE_NANOSLEEP)
 114     timespec tmReq;
 115     tmReq.tv_sec = (time_t)(milliseconds / 1000);
 116     tmReq.tv_nsec = (milliseconds % 1000) * 1000 * 1000;
 117
 118     // we're not interested in remaining time nor in return value
 119     (void)nanosleep(&tmReq, (timespec *)NULL);
 120 #elif defined(HAVE_USLEEP)
 121     // uncomment this if you feel brave or if you are sure that your version
 122     // of Solaris has a safe usleep() function but please notice that usleep()
 123     // is known to lead to crashes in MT programs in Solaris 2.[67] and is not
 124     // documented as MT-Safe
 125     #if defined(__SUN__) && wxUSE_THREADS
 126         #error "usleep() cannot be used in MT programs under Solaris."
 127     #endif // Sun
 128
 129     usleep(milliseconds * 1000); // usleep(3) wants microseconds
 130 #elif defined(HAVE_SLEEP)
 131     // under BeOS sleep() takes seconds (what about other platforms, if any?)
 132     sleep(milliseconds * 1000);
 133 #else // !sleep function
 134     #error "usleep() or nanosleep() function required for wxUsleep"
 135 #endif // sleep function
 136 }
 137
 138 // ----------------------------------------------------------------------------
 139 // process management
 140 // ----------------------------------------------------------------------------
 141
 142 int wxKill(long pid, wxSignal sig, wxKillError *rc)
 143 {
 144     int err = kill((pid_t)pid, (int)sig);
 145     if ( rc )
 146     {
 147         switch ( err )
 148         {
 149             case 0:
 150                 *rc = wxKILL_OK;
 151                 break;
 152
 153             case EINVAL:
 154                 *rc = wxKILL_BAD_SIGNAL;
 155                 break;
 156
 157             case EPERM:
 158                 *rc = wxKILL_ACCESS_DENIED;
 159                 break;
 160
 161             case ESRCH:
 162                 *rc = wxKILL_NO_PROCESS;
 163                 break;
 164
 165             default:
 166                 // this goes against Unix98 docs so log it
 167                 wxLogDebug(_T("unexpected kill(2) return value %d"), err);
 168
 169                 // something else...
 170                 *rc = wxKILL_ERROR;
 171         }
 172     }
 173
 174     return err;
 175 }
 176
 177 #define WXEXECUTE_NARGS   127
 178
 179 long wxExecute( const wxString& command, bool sync, wxProcess *process )
 180 {
 181     wxCHECK_MSG( !command.IsEmpty(), 0, wxT("can't exec empty command") );
 182
 183     int argc = 0;
 184     wxChar *argv[WXEXECUTE_NARGS];
 185     wxString argument;
 186     const wxChar *cptr = command.c_str();
 187     wxChar quotechar = wxT('\0'); // is arg quoted?
 188     bool escaped = FALSE;
 189
 190     // split the command line in arguments
 191     do
 192     {
 193         argument=wxT("");
 194         quotechar = wxT('\0');
 195
 196         // eat leading whitespace:
 197         while ( wxIsspace(*cptr) )
 198             cptr++;
 199
 200         if ( *cptr == wxT('\'') || *cptr == wxT('"') )
 201             quotechar = *cptr++;
 202
 203         do
 204         {
 205             if ( *cptr == wxT('\\') && ! escaped )
 206             {
 207                 escaped = TRUE;
 208                 cptr++;
 209                 continue;
 210             }
 211
 212             // all other characters:
 213             argument += *cptr++;
 214             escaped = FALSE;
 215
 216             // have we reached the end of the argument?
 217             if ( (*cptr == quotechar && ! escaped)
 218                  || (quotechar == wxT('\0') && wxIsspace(*cptr))
 219                  || *cptr == wxT('\0') )
 220             {
 221                 wxASSERT_MSG( argc < WXEXECUTE_NARGS,
 222                               wxT("too many arguments in wxExecute") );
 223
 224                 argv[argc] = new wxChar[argument.length() + 1];
 225                 wxStrcpy(argv[argc], argument.c_str());
 226                 argc++;
 227
 228                 // if not at end of buffer, swallow last character:
 229                 if(*cptr)
 230                     cptr++;
 231
 232                 break; // done with this one, start over
 233             }
 234         } while(*cptr);
 235     } while(*cptr);
 236     argv[argc] = NULL;
 237
 238     // do execute the command
 239     long lRc = wxExecute(argv, sync, process);
 240
 241     // clean up
 242     argc = 0;
 243     while( argv[argc] )
 244         delete [] argv[argc++];
 245
 246     return lRc;
 247 }
 248
 249 // ----------------------------------------------------------------------------
 250 // wxShell
 251 // ----------------------------------------------------------------------------
 252
 253 static wxString wxMakeShellCommand(const wxString& command)
 254 {
 255     wxString cmd;
 256     if ( !command )
 257     {
 258         // just an interactive shell
 259         cmd = _T("xterm");
 260     }
 261     else
 262     {
 263         // execute command in a shell
 264         cmd << _T("/bin/sh -c '") << command << _T('\'');
 265     }
 266
 267     return cmd;
 268 }
 269
 270 bool wxShell(const wxString& command)
 271 {
 272     return wxExecute(wxMakeShellCommand(command), TRUE /* sync */) == 0;
 273 }
 274
 275 bool wxShell(const wxString& command, wxArrayString& output)
 276 {
 277     wxCHECK_MSG( !!command, FALSE, _T("can't exec shell non interactively") );
 278
 279     return wxExecute(wxMakeShellCommand(command), output);
 280 }
 281
 282 #if wxUSE_GUI
 283
 284 void wxHandleProcessTermination(wxEndProcessData *proc_data)
 285 {
 286     int pid = (proc_data->pid > 0) ? proc_data->pid : -(proc_data->pid);
 287
 288     // waitpid is POSIX so should be available everywhere, however on older
 289     // systems wait() might be used instead in a loop (until the right pid
 290     // terminates)
 291     int status = 0;
 292     int rc;
 293
 294     // wait for child termination and if waitpid() was interrupted, try again
 295     do
 296     {
 297        rc = waitpid(pid, &status, 0);
 298     }
 299     while ( rc == -1 && errno == EINTR );
 300
 301
 302     if( rc == -1 || ! (WIFEXITED(status) || WIFSIGNALED(status)) )
 303     {
 304        wxLogSysError(_("Waiting for subprocess termination failed"));
 305        /* AFAIK, this can only happen if something went wrong within
 306           wxGTK, i.e. due to a race condition or some serious bug.
 307           After having fixed the order of statements in
 308           GTK_EndProcessDetector(). (KB)
 309        */
 310     }
 311     else
 312     {
 313         // notify user about termination if required
 314         if (proc_data->process)
 315         {
 316             proc_data->process->OnTerminate(proc_data->pid,
 317                                             WEXITSTATUS(status));
 318         }
 319         // clean up
 320         if ( proc_data->pid > 0 )
 321         {
 322            delete proc_data;
 323         }
 324         else
 325         {
 326            // wxExecute() will know about it
 327            proc_data->exitcode = status;
 328
 329            proc_data->pid = 0;
 330         }
 331     }
 332 }
 333
 334 #endif // wxUSE_GUI
 335
 336 // ----------------------------------------------------------------------------
 337 // wxStream classes to support IO redirection in wxExecute
 338 // ----------------------------------------------------------------------------
 339
 340 #if wxUSE_STREAMS
 341
 342 class wxProcessFileInputStream : public wxInputStream
 343 {
 344 public:
 345     wxProcessFileInputStream(int fd) { m_fd = fd; }
 346     ~wxProcessFileInputStream() { close(m_fd); }
 347
 348     virtual bool Eof() const;
 349
 350 protected:
 351     size_t OnSysRead(void *buffer, size_t bufsize);
 352
 353 protected:
 354     int m_fd;
 355 };
 356
 357 class wxProcessFileOutputStream : public wxOutputStream
 358 {
 359 public:
 360     wxProcessFileOutputStream(int fd) { m_fd = fd; }
 361     ~wxProcessFileOutputStream() { close(m_fd); }
 362
 363 protected:
 364     size_t OnSysWrite(const void *buffer, size_t bufsize);
 365
 366 protected:
 367     int m_fd;
 368 };
 369
 370 bool wxProcessFileInputStream::Eof() const
 371 {
 372     if ( m_lasterror == wxSTREAM_EOF )
 373         return TRUE;
 374
 375     // check if there is any input available
 376     struct timeval tv;
 377     tv.tv_sec = 0;
 378     tv.tv_usec = 0;
 379
 380     fd_set readfds;
 381     FD_ZERO(&readfds);
 382     FD_SET(m_fd, &readfds);
 383     switch ( select(m_fd + 1, &readfds, NULL, NULL, &tv) )
 384     {
 385         case -1:
 386             wxLogSysError(_("Impossible to get child process input"));
 387             // fall through
 388
 389         case 0:
 390             return TRUE;
 391
 392         default:
 393             wxFAIL_MSG(_T("unexpected select() return value"));
 394             // still fall through
 395
 396         case 1:
 397             // input available: check if there is any
 398             return wxInputStream::Eof();
 399     }
 400 }
 401
 402 size_t wxProcessFileInputStream::OnSysRead(void *buffer, size_t bufsize)
 403 {
 404     int ret = read(m_fd, buffer, bufsize);
 405     if ( ret == 0 )
 406     {
 407         m_lasterror = wxSTREAM_EOF;
 408     }
 409     else if ( ret == -1 )
 410     {
 411         m_lasterror = wxSTREAM_READ_ERROR;
 412         ret = 0;
 413     }
 414     else
 415     {
 416         m_lasterror = wxSTREAM_NOERROR;
 417     }
 418
 419     return ret;
 420 }
 421
 422 size_t wxProcessFileOutputStream::OnSysWrite(const void *buffer, size_t bufsize)
 423 {
 424     int ret = write(m_fd, buffer, bufsize);
 425     if ( ret == -1 )
 426     {
 427         m_lasterror = wxSTREAM_WRITE_ERROR;
 428         ret = 0;
 429     }
 430     else
 431     {
 432         m_lasterror = wxSTREAM_NOERROR;
 433     }
 434
 435     return ret;
 436 }
 437
 438 #endif // wxUSE_STREAMS
 439
 440 long wxExecute(wxChar **argv,
 441                bool sync,
 442                wxProcess *process)
 443 {
 444     // for the sync execution, we return -1 to indicate failure, but for async
 445     // case we return 0 which is never a valid PID
 446     //
 447     // we define this as a macro, not a variable, to avoid compiler warnings
 448     // about "ERROR_RETURN_CODE value may be clobbered by fork()"
 449     #define ERROR_RETURN_CODE ((sync) ? -1 : 0)
 450
 451     wxCHECK_MSG( *argv, ERROR_RETURN_CODE, wxT("can't exec empty command") );
 452
 453 #if wxUSE_UNICODE
 454     int mb_argc = 0;
 455     char *mb_argv[WXEXECUTE_NARGS];
 456
 457     while (argv[mb_argc])
 458     {
 459         wxWX2MBbuf mb_arg = wxConvertWX2MB(argv[mb_argc]);
 460         mb_argv[mb_argc] = strdup(mb_arg);
 461         mb_argc++;
 462     }
 463     mb_argv[mb_argc] = (char *) NULL;
 464
 465     // this macro will free memory we used above
 466     #define ARGS_CLEANUP                                 \
 467         for ( mb_argc = 0; mb_argv[mb_argc]; mb_argc++ ) \
 468             free(mb_argv[mb_argc])
 469 #else // ANSI
 470     // no need for cleanup
 471     #define ARGS_CLEANUP
 472
 473     wxChar **mb_argv = argv;
 474 #endif // Unicode/ANSI
 475
 476 #if wxUSE_GUI
 477     // create pipes
 478     int end_proc_detect[2];
 479     if ( pipe(end_proc_detect) == -1 )
 480     {
 481         wxLogSysError( _("Pipe creation failed") );
 482         wxLogError( _("Failed to execute '%s'\n"), *argv );
 483
 484         ARGS_CLEANUP;
 485
 486         return ERROR_RETURN_CODE;
 487     }
 488 #endif // wxUSE_GUI
 489
 490     // pipes for inter process communication
 491     int pipeIn[2],      // stdin
 492         pipeOut[2],     // stdout
 493         pipeErr[2];     // stderr
 494
 495     pipeIn[0] = pipeIn[1] =
 496     pipeOut[0] = pipeOut[1] =
 497     pipeErr[0] = pipeErr[1] = -1;
 498
 499     if ( process && process->IsRedirected() )
 500     {
 501         if ( pipe(pipeIn) == -1 || pipe(pipeOut) == -1 || pipe(pipeErr) == -1 )
 502         {
 503 #if wxUSE_GUI
 504             // free previously allocated resources
 505             close(end_proc_detect[0]);
 506             close(end_proc_detect[1]);
 507 #endif // wxUSE_GUI
 508
 509             wxLogSysError( _("Pipe creation failed") );
 510             wxLogError( _("Failed to execute '%s'\n"), *argv );
 511
 512             ARGS_CLEANUP;
 513
 514             return ERROR_RETURN_CODE;
 515         }
 516     }
 517
 518     // fork the process
 519 #ifdef HAVE_VFORK
 520     pid_t pid = vfork();
 521 #else
 522     pid_t pid = fork();
 523 #endif
 524
 525     if ( pid == -1 )     // error?
 526     {
 527 #if wxUSE_GUI
 528         close(end_proc_detect[0]);
 529         close(end_proc_detect[1]);
 530         close(pipeIn[0]);
 531         close(pipeIn[1]);
 532         close(pipeOut[0]);
 533         close(pipeOut[1]);
 534         close(pipeErr[0]);
 535         close(pipeErr[1]);
 536 #endif // wxUSE_GUI
 537
 538         wxLogSysError( _("Fork failed") );
 539
 540         ARGS_CLEANUP;
 541
 542         return ERROR_RETURN_CODE;
 543     }
 544     else if ( pid == 0 )  // we're in child
 545     {
 546 #if wxUSE_GUI
 547         close(end_proc_detect[0]); // close reading side
 548 #endif // wxUSE_GUI
 549
 550         // These lines close the open file descriptors to to avoid any
 551         // input/output which might block the process or irritate the user. If
 552         // one wants proper IO for the subprocess, the right thing to do is to
 553         // start an xterm executing it.
 554         if ( !sync )
 555         {
 556             for ( int fd = 0; fd < FD_SETSIZE; fd++ )
 557             {
 558                 if ( fd == pipeIn[0] || fd == pipeOut[1] || fd == pipeErr[1]
 559 #if wxUSE_GUI
 560                      || fd == end_proc_detect[1]
 561 #endif // wxUSE_GUI
 562                    )
 563                 {
 564                     // don't close this one, we still need it
 565                     continue;
 566                 }
 567
 568                 // leave stderr opened too, it won't do any hurm
 569                 if ( fd != STDERR_FILENO )
 570                     close(fd);
 571             }
 572         }
 573
 574         // redirect stdio, stdout and stderr
 575         if ( pipeIn[0] != -1 )
 576         {
 577             if ( dup2(pipeIn[0], STDIN_FILENO) == -1 ||
 578                  dup2(pipeOut[1], STDOUT_FILENO) == -1 ||
 579                  dup2(pipeErr[1], STDERR_FILENO) == -1 )
 580             {
 581                 wxLogSysError(_("Failed to redirect child process input/output"));
 582             }
 583
 584             close(pipeIn[0]);
 585             close(pipeOut[1]);
 586             close(pipeErr[1]);
 587         }
 588
 589         execvp (*mb_argv, mb_argv);
 590
 591         // there is no return after successful exec()
 592         _exit(-1);
 593     }
 594     else // we're in parent
 595     {
 596         ARGS_CLEANUP;
 597
 598         // pipe initialization: construction of the wxStreams
 599         if ( process && process->IsRedirected() )
 600         {
 601 #if wxUSE_STREAMS
 602             // These two streams are relative to this process.
 603             wxOutputStream *outStream = new wxProcessFileOutputStream(pipeIn[1]);
 604             wxInputStream *inStream = new wxProcessFileInputStream(pipeOut[0]);
 605             wxInputStream *errStream = new wxProcessFileInputStream(pipeErr[0]);
 606
 607             process->SetPipeStreams(inStream, outStream, errStream);
 608 #endif // wxUSE_STREAMS
 609
 610             close(pipeIn[0]); // close reading side
 611             close(pipeOut[1]); // close writing side
 612             close(pipeErr[1]); // close writing side
 613         }
 614
 615 #if wxUSE_GUI && !defined(__WXMICROWIN__)
 616         wxEndProcessData *data = new wxEndProcessData;
 617
 618         if ( sync )
 619         {
 620             // we may have process for capturing the program output, but it's
 621             // not used in wxEndProcessData in the case of sync execution
 622             data->process = NULL;
 623
 624             // sync execution: indicate it by negating the pid
 625             data->pid = -pid;
 626             data->tag = wxAddProcessCallback(data, end_proc_detect[0]);
 627
 628             close(end_proc_detect[1]); // close writing side
 629
 630             wxBusyCursor bc;
 631             wxWindowDisabler wd;
 632
 633             // it will be set to 0 from GTK_EndProcessDetector
 634             while (data->pid != 0)
 635                 wxYield();
 636
 637             int exitcode = data->exitcode;
 638
 639             delete data;
 640
 641             return exitcode;
 642         }
 643         else // async execution
 644         {
 645             // async execution, nothing special to do - caller will be
 646             // notified about the process termination if process != NULL, data
 647             // will be deleted in GTK_EndProcessDetector
 648             data->process  = process;
 649             data->pid      = pid;
 650             data->tag      = wxAddProcessCallback(data, end_proc_detect[0]);
 651
 652             close(end_proc_detect[1]); // close writing side
 653
 654             return pid;
 655         }
 656 #else // !wxUSE_GUI
 657         wxASSERT_MSG( sync, wxT("async execution not supported yet") );
 658
 659         int exitcode = 0;
 660         if ( waitpid(pid, &exitcode, 0) == -1 || !WIFEXITED(exitcode) )
 661         {
 662             wxLogSysError(_("Waiting for subprocess termination failed"));
 663         }
 664
 665         return exitcode;
 666 #endif // wxUSE_GUI
 667     }
 668 #ifdef __VMS
 669    // VMS does not recognise exit as a return and complains about
 670    // a missing return
 671    // I think VMS is wrong in this
 672    //     JJ
 673    return 0;
 674 #endif
 675 }
 676
 677 #undef ERROR_RETURN_CODE
 678 #undef ARGS_CLEANUP
 679
 680 // ----------------------------------------------------------------------------
 681 // file and directory functions
 682 // ----------------------------------------------------------------------------
 683
 684 const wxChar* wxGetHomeDir( wxString *home  )
 685 {
 686     *home = wxGetUserHome( wxString() );
 687    wxString tmp;
 688     if ( home->IsEmpty() )
 689         *home = wxT("/");
 690 #ifdef __VMS
 691    tmp = *home;
 692    if ( tmp.Last() != wxT(']'))
 693      if ( tmp.Last() != wxT('/')) *home << wxT('/');
 694 #endif
 695     return home->c_str();
 696 }
 697
 698 #if wxUSE_UNICODE
 699 const wxMB2WXbuf wxGetUserHome( const wxString &user )
 700 #else // just for binary compatibility -- there is no 'const' here
 701 char *wxGetUserHome( const wxString &user )
 702 #endif
 703 {
 704     struct passwd *who = (struct passwd *) NULL;
 705
 706     if ( !user )
 707     {
 708         wxChar *ptr;
 709
 710         if ((ptr = wxGetenv(wxT("HOME"))) != NULL)
 711         {
 712             return ptr;
 713         }
 714         if ((ptr = wxGetenv(wxT("USER"))) != NULL || (ptr = wxGetenv(wxT("LOGNAME"))) != NULL)
 715         {
 716             who = getpwnam(wxConvertWX2MB(ptr));
 717         }
 718
 719         // We now make sure the the user exists!
 720         if (who == NULL)
 721         {
 722             who = getpwuid(getuid());
 723         }
 724     }
 725     else
 726     {
 727       who = getpwnam (user.mb_str());
 728     }
 729
 730     return wxConvertMB2WX(who ? who->pw_dir : 0);
 731 }
 732
 733 // ----------------------------------------------------------------------------
 734 // network and user id routines
 735 // ----------------------------------------------------------------------------
 736
 737 // retrieve either the hostname or FQDN depending on platform (caller must
 738 // check whether it's one or the other, this is why this function is for
 739 // private use only)
 740 static bool wxGetHostNameInternal(wxChar *buf, int sz)
 741 {
 742     wxCHECK_MSG( buf, FALSE, wxT("NULL pointer in wxGetHostNameInternal") );
 743
 744     *buf = wxT('\0');
 745
 746     // we're using uname() which is POSIX instead of less standard sysinfo()
 747 #if defined(HAVE_UNAME)
 748     struct utsname uts;
 749     bool ok = uname(&uts) != -1;
 750     if ( ok )
 751     {
 752         wxStrncpy(buf, wxConvertMB2WX(uts.nodename), sz - 1);
 753         buf[sz] = wxT('\0');
 754     }
 755 #elif defined(HAVE_GETHOSTNAME)
 756     bool ok = gethostname(buf, sz) != -1;
 757 #else // no uname, no gethostname
 758     wxFAIL_MSG(wxT("don't know host name for this machine"));
 759
 760     bool ok = FALSE;
 761 #endif // uname/gethostname
 762
 763     if ( !ok )
 764     {
 765         wxLogSysError(_("Cannot get the hostname"));
 766     }
 767
 768     return ok;
 769 }
 770
 771 bool wxGetHostName(wxChar *buf, int sz)
 772 {
 773     bool ok = wxGetHostNameInternal(buf, sz);
 774
 775     if ( ok )
 776     {
 777         // BSD systems return the FQDN, we only want the hostname, so extract
 778         // it (we consider that dots are domain separators)
 779         wxChar *dot = wxStrchr(buf, wxT('.'));
 780         if ( dot )
 781         {
 782             // nuke it
 783             *dot = wxT('\0');
 784         }
 785     }
 786
 787     return ok;
 788 }
 789
 790 bool wxGetFullHostName(wxChar *buf, int sz)
 791 {
 792     bool ok = wxGetHostNameInternal(buf, sz);
 793
 794     if ( ok )
 795     {
 796         if ( !wxStrchr(buf, wxT('.')) )
 797         {
 798             struct hostent *host = gethostbyname(wxConvertWX2MB(buf));
 799             if ( !host )
 800             {
 801                 wxLogSysError(_("Cannot get the official hostname"));
 802
 803                 ok = FALSE;
 804             }
 805             else
 806             {
 807                 // the canonical name
 808                 wxStrncpy(buf, wxConvertMB2WX(host->h_name), sz);
 809             }
 810         }
 811         //else: it's already a FQDN (BSD behaves this way)
 812     }
 813
 814     return ok;
 815 }
 816
 817 bool wxGetUserId(wxChar *buf, int sz)
 818 {
 819     struct passwd *who;
 820
 821     *buf = wxT('\0');
 822     if ((who = getpwuid(getuid ())) != NULL)
 823     {
 824         wxStrncpy (buf, wxConvertMB2WX(who->pw_name), sz - 1);
 825         return TRUE;
 826     }
 827
 828     return FALSE;
 829 }
 830
 831 bool wxGetUserName(wxChar *buf, int sz)
 832 {
 833     struct passwd *who;
 834
 835     *buf = wxT('\0');
 836     if ((who = getpwuid (getuid ())) != NULL)
 837     {
 838         // pw_gecos field in struct passwd is not standard
 839 #ifdef HAVE_PW_GECOS
 840        char *comma = strchr(who->pw_gecos, ',');
 841        if (comma)
 842            *comma = '\0'; // cut off non-name comment fields
 843        wxStrncpy (buf, wxConvertMB2WX(who->pw_gecos), sz - 1);
 844 #else // !HAVE_PW_GECOS
 845        wxStrncpy (buf, wxConvertMB2WX(who->pw_name), sz - 1);
 846 #endif // HAVE_PW_GECOS/!HAVE_PW_GECOS
 847        return TRUE;
 848     }
 849
 850     return FALSE;
 851 }
 852
 853 wxString wxGetOsDescription()
 854 {
 855 #ifndef WXWIN_OS_DESCRIPTION
 856     #error WXWIN_OS_DESCRIPTION should be defined in config.h by configure
 857 #else
 858     return WXWIN_OS_DESCRIPTION;
 859 #endif
 860 }
 861
 862 // this function returns the GUI toolkit version in GUI programs, but OS
 863 // version in non-GUI ones
 864 #if !wxUSE_GUI
 865
 866 int wxGetOsVersion(int *majorVsn, int *minorVsn)
 867 {
 868     int major, minor;
 869     char name[256];
 870
 871     if ( sscanf(WXWIN_OS_DESCRIPTION, "%s %d.%d", name, &major, &minor) != 3 )
 872     {
 873         // unreckognized uname string format
 874         major = minor = -1;
 875     }
 876
 877     if ( majorVsn )
 878         *majorVsn = major;
 879     if ( minorVsn )
 880         *minorVsn = minor;
 881
 882     return wxUNIX;
 883 }
 884
 885 #endif // !wxUSE_GUI
 886
 887 long wxGetFreeMemory()
 888 {
 889 #if defined(__LINUX__)
 890     // get it from /proc/meminfo
 891     FILE *fp = fopen("/proc/meminfo", "r");
 892     if ( fp )
 893     {
 894         long memFree = -1;
 895
 896         char buf[1024];
 897         if ( fgets(buf, WXSIZEOF(buf), fp) && fgets(buf, WXSIZEOF(buf), fp) )
 898         {
 899             long memTotal, memUsed;
 900             sscanf(buf, "Mem: %ld %ld %ld", &memTotal, &memUsed, &memFree);
 901         }
 902
 903         fclose(fp);
 904
 905         return memFree;
 906     }
 907 #elif defined(__SUN__) && defined(_SC_AVPHYS_PAGES)
 908     return sysconf(_SC_AVPHYS_PAGES)*sysconf(_SC_PAGESIZE);
 909 //#elif defined(__FREEBSD__) -- might use sysctl() to find it out, probably
 910 #endif
 911
 912     // can't find it out
 913     return -1;
 914 }
 915
 916 bool wxGetDiskSpace(const wxString& path, wxLongLong *pTotal, wxLongLong *pFree)
 917 {
 918 #ifdef HAVE_STATFS
 919
 920     struct statfs fs;
 921     if ( statfs(path, &fs) != 0 )
 922     {
 923         wxLogSysError("Failed to get file system statistics");
 924
 925         return FALSE;
 926     }
 927
 928     if ( pTotal )
 929     {
 930         *pTotal = wxLongLong(fs.f_blocks) * fs.f_bsize;
 931     }
 932
 933     if ( pFree )
 934     {
 935         *pFree = wxLongLong(fs.f_bavail) * fs.f_bsize;
 936     }
 937
 938     return TRUE;
 939 #endif // HAVE_STATFS
 940
 941     return FALSE;
 942 }
 943
 944 // ----------------------------------------------------------------------------
 945 // env vars
 946 // ----------------------------------------------------------------------------
 947
 948 bool wxGetEnv(const wxString& var, wxString *value)
 949 {
 950     // wxGetenv is defined as getenv()
 951     wxChar *p = wxGetenv(var);
 952     if ( !p )
 953         return FALSE;
 954
 955     if ( value )
 956     {
 957         *value = p;
 958     }
 959
 960     return TRUE;
 961 }
 962
 963 bool wxSetEnv(const wxString& variable, const wxChar *value)
 964 {
 965 #if defined(HAVE_SETENV)
 966     return setenv(variable.mb_str(), value ? wxString(value).mb_str().data()
 967                                            : NULL, 1 /* overwrite */) == 0;
 968 #elif defined(HAVE_PUTENV)
 969     wxString s = variable;
 970     if ( value )
 971         s << _T('=') << value;
 972
 973     // transform to ANSI
 974     const char *p = s.mb_str();
 975
 976     // the string will be free()d by libc
 977     char *buf = (char *)malloc(strlen(p) + 1);
 978     strcpy(buf, p);
 979
 980     return putenv(buf) == 0;
 981 #else // no way to set an env var
 982     return FALSE;
 983 #endif
 984 }
 985
 986 // ----------------------------------------------------------------------------
 987 // signal handling
 988 // ----------------------------------------------------------------------------
 989
 990 #if wxUSE_ON_FATAL_EXCEPTION
 991
 992 #include <signal.h>
 993
 994 static void wxFatalSignalHandler(wxTYPE_SA_HANDLER)
 995 {
 996     if ( wxTheApp )
 997     {
 998         // give the user a chance to do something special about this
 999         wxTheApp->OnFatalException();
1000     }
1001
1002     abort();
1003 }
1004
1005 bool wxHandleFatalExceptions(bool doit)
1006 {
1007     // old sig handlers
1008     static bool s_savedHandlers = FALSE;
1009     static struct sigaction s_handlerFPE,
1010                             s_handlerILL,
1011                             s_handlerBUS,
1012                             s_handlerSEGV;
1013
1014     bool ok = TRUE;
1015     if ( doit && !s_savedHandlers )
1016     {
1017         // install the signal handler
1018         struct sigaction act;
1019
1020         // some systems extend it with non std fields, so zero everything
1021         memset(&act, 0, sizeof(act));
1022
1023         act.sa_handler = wxFatalSignalHandler;
1024         sigemptyset(&act.sa_mask);
1025         act.sa_flags = 0;
1026
1027         ok &= sigaction(SIGFPE, &act, &s_handlerFPE) == 0;
1028         ok &= sigaction(SIGILL, &act, &s_handlerILL) == 0;
1029         ok &= sigaction(SIGBUS, &act, &s_handlerBUS) == 0;
1030         ok &= sigaction(SIGSEGV, &act, &s_handlerSEGV) == 0;
1031         if ( !ok )
1032         {
1033             wxLogDebug(_T("Failed to install our signal handler."));
1034         }
1035
1036         s_savedHandlers = TRUE;
1037     }
1038     else if ( s_savedHandlers )
1039     {
1040         // uninstall the signal handler
1041         ok &= sigaction(SIGFPE, &s_handlerFPE, NULL) == 0;
1042         ok &= sigaction(SIGILL, &s_handlerILL, NULL) == 0;
1043         ok &= sigaction(SIGBUS, &s_handlerBUS, NULL) == 0;
1044         ok &= sigaction(SIGSEGV, &s_handlerSEGV, NULL) == 0;
1045         if ( !ok )
1046         {
1047             wxLogDebug(_T("Failed to uninstall our signal handler."));
1048         }
1049
1050         s_savedHandlers = FALSE;
1051     }
1052     //else: nothing to do
1053
1054     return ok;
1055 }
1056
1057 #endif // wxUSE_ON_FATAL_EXCEPTION
1058
1059 // ----------------------------------------------------------------------------
1060 // error and debug output routines (deprecated, use wxLog)
1061 // ----------------------------------------------------------------------------
1062
1063 void wxDebugMsg( const char *format, ... )
1064 {
1065   va_list ap;
1066   va_start( ap, format );
1067   vfprintf( stderr, format, ap );
1068   fflush( stderr );
1069   va_end(ap);
1070 }
1071
1072 void wxError( const wxString &msg, const wxString &title )
1073 {
1074   wxFprintf( stderr, _("Error ") );
1075   if (!title.IsNull()) wxFprintf( stderr, wxT("%s "), WXSTRINGCAST(title) );
1076   if (!msg.IsNull()) wxFprintf( stderr, wxT(": %s"), WXSTRINGCAST(msg) );
1077   wxFprintf( stderr, wxT(".\n") );
1078 }
1079
1080 void wxFatalError( const wxString &msg, const wxString &title )
1081 {
1082   wxFprintf( stderr, _("Error ") );
1083   if (!title.IsNull()) wxFprintf( stderr, wxT("%s "), WXSTRINGCAST(title) );
1084   if (!msg.IsNull()) wxFprintf( stderr, wxT(": %s"), WXSTRINGCAST(msg) );
1085   wxFprintf( stderr, wxT(".\n") );
1086   exit(3); // the same exit code as for abort()
1087 }
1088