libiberty/pexecute.c

   1 /* Utilities to execute a program in a subprocess (possibly linked by pipes
   2    with other subprocesses), and wait for it.
   3    Copyright (C) 1996, 1997, 1998 Free Software Foundation, Inc.
   4
   5 This file is part of the libiberty library.
   6 Libiberty is free software; you can redistribute it and/or
   7 modify it under the terms of the GNU Library General Public
   8 License as published by the Free Software Foundation; either
   9 version 2 of the License, or (at your option) any later version.
  10
  11 Libiberty is distributed in the hope that it will be useful,
  12 but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14 Library General Public License for more details.
  15
  16 You should have received a copy of the GNU Library General Public
  17 License along with libiberty; see the file COPYING.LIB.  If not,
  18 write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  19 Boston, MA 02111-1307, USA.  */
  20
  21 /* This file exports two functions: pexecute and pwait.  */
  22
  23 /* This file lives in at least two places: libiberty and gcc.
  24    Don't change one without the other.  */
  25
  26 #ifdef HAVE_CONFIG_H
  27 #include "config.h"
  28 #endif
  29
  30 #include <stdio.h>
  31 #include <errno.h>
  32 #ifdef HAVE_UNISTD_H
  33 #include <unistd.h>
  34 #endif
  35 #define ISSPACE (x) isspace(x)
  36 #ifdef HAVE_SYS_WAIT_H
  37 #include <sys/wait.h>
  38 #endif
  39
  40 #ifdef vfork /* Autoconf may define this to fork for us. */
  41 # define VFORK_STRING "fork"
  42 #else
  43 # define VFORK_STRING "vfork"
  44 #endif
  45 #ifdef HAVE_VFORK_H
  46 #include <vfork.h>
  47 #endif
  48 #ifdef VMS
  49 #define vfork() (decc$$alloc_vfork_blocks() >= 0 ? \
  50                lib$get_current_invo_context(decc$$get_vfork_jmpbuf()) : -1)
  51 #endif /* VMS */
  52
  53 #include "libiberty.h"
  54
  55 /* stdin file number.  */
  56 #define STDIN_FILE_NO 0
  57
  58 /* stdout file number.  */
  59 #define STDOUT_FILE_NO 1
  60
  61 /* value of `pipe': port index for reading.  */
  62 #define READ_PORT 0
  63
  64 /* value of `pipe': port index for writing.  */
  65 #define WRITE_PORT 1
  66
  67 static char *install_error_msg = "installation problem, cannot exec `%s'";
  68
  69 /* pexecute: execute a program.
  70
  71    PROGRAM and ARGV are the arguments to execv/execvp.
  72
  73    THIS_PNAME is name of the calling program (i.e. argv[0]).
  74
  75    TEMP_BASE is the path name, sans suffix, of a temporary file to use
  76    if needed.  This is currently only needed for MSDOS ports that don't use
  77    GO32 (do any still exist?).  Ports that don't need it can pass NULL.
  78
  79    (FLAGS & PEXECUTE_SEARCH) is non-zero if $PATH should be searched
  80    (??? It's not clear that GCC passes this flag correctly).
  81    (FLAGS & PEXECUTE_FIRST) is nonzero for the first process in chain.
  82    (FLAGS & PEXECUTE_FIRST) is nonzero for the last process in chain.
  83    FIRST_LAST could be simplified to only mark the last of a chain of processes
  84    but that requires the caller to always mark the last one (and not give up
  85    early if some error occurs).  It's more robust to require the caller to
  86    mark both ends of the chain.
  87
  88    The result is the pid on systems like Unix where we fork/exec and on systems
  89    like WIN32 and OS2 where we use spawn.  It is up to the caller to wait for
  90    the child.
  91
  92    The result is the WEXITSTATUS on systems like MSDOS where we spawn and wait
  93    for the child here.
  94
  95    Upon failure, ERRMSG_FMT and ERRMSG_ARG are set to the text of the error
  96    message with an optional argument (if not needed, ERRMSG_ARG is set to
  97    NULL), and -1 is returned.  `errno' is available to the caller to use.
  98
  99    pwait: cover function for wait.
 100
 101    PID is the process id of the task to wait for.
 102    STATUS is the `status' argument to wait.
 103    FLAGS is currently unused (allows future enhancement without breaking
 104    upward compatibility).  Pass 0 for now.
 105
 106    The result is the pid of the child reaped,
 107    or -1 for failure (errno says why).
 108
 109    On systems that don't support waiting for a particular child, PID is
 110    ignored.  On systems like MSDOS that don't really multitask pwait
 111    is just a mechanism to provide a consistent interface for the caller.
 112
 113    pfinish: finish generation of script
 114
 115    pfinish is necessary for systems like MPW where a script is generated that
 116    runs the requested programs.
 117 */
 118
 119 #ifdef __MSDOS__
 120
 121 /* MSDOS doesn't multitask, but for the sake of a consistent interface
 122    the code behaves like it does.  pexecute runs the program, tucks the
 123    exit code away, and returns a "pid".  pwait must be called to fetch the
 124    exit code.  */
 125
 126 #include <process.h>
 127
 128 /* For communicating information from pexecute to pwait.  */
 129 static int last_pid = 0;
 130 static int last_status = 0;
 131 static int last_reaped = 0;
 132
 133 int
 134 pexecute (program, argv, this_pname, temp_base, errmsg_fmt, errmsg_arg, flags)
 135      const char *program;
 136      char * const *argv;
 137      const char *this_pname;
 138      const char *temp_base;
 139      char **errmsg_fmt, **errmsg_arg;
 140      int flags;
 141 {
 142   int rc;
 143
 144   last_pid++;
 145   if (last_pid < 0)
 146     last_pid = 1;
 147
 148   if ((flags & PEXECUTE_ONE) != PEXECUTE_ONE)
 149     abort ();
 150
 151 #ifdef __GO32__
 152   /* ??? What are the possible return values from spawnv?  */
 153   rc = (flags & PEXECUTE_SEARCH ? spawnvp : spawnv) (1, program, argv);
 154 #else
 155   char *scmd, *rf;
 156   FILE *argfile;
 157   int i, el = flags & PEXECUTE_SEARCH ? 4 : 0;
 158
 159   scmd = (char *) xmalloc (strlen (program) + strlen (temp_base) + 6 + el);
 160   rf = scmd + strlen(program) + 2 + el;
 161   sprintf (scmd, "%s%s @%s.gp", program,
 162            (flags & PEXECUTE_SEARCH ? ".exe" : ""), temp_base);
 163   argfile = fopen (rf, "w");
 164   if (argfile == 0)
 165     {
 166       int errno_save = errno;
 167       free (scmd);
 168       errno = errno_save;
 169       *errmsg_fmt = "cannot open `%s.gp'";
 170       *errmsg_arg = temp_base;
 171       return -1;
 172     }
 173
 174   for (i=1; argv[i]; i++)
 175     {
 176       char *cp;
 177       for (cp = argv[i]; *cp; cp++)
 178         {
 179           if (*cp == '"' || *cp == '\'' || *cp == '\\' || ISSPACE (*cp))
 180             fputc ('\\', argfile);
 181           fputc (*cp, argfile);
 182         }
 183       fputc ('\n', argfile);
 184     }
 185   fclose (argfile);
 186
 187   rc = system (scmd);
 188
 189   {
 190     int errno_save = errno;
 191     remove (rf);
 192     free (scmd);
 193     errno = errno_save;
 194   }
 195 #endif
 196
 197   if (rc == -1)
 198     {
 199       *errmsg_fmt = install_error_msg;
 200       *errmsg_arg = program;
 201       return -1;
 202     }
 203
 204   /* Tuck the status away for pwait, and return a "pid".  */
 205   last_status = rc << 8;
 206   return last_pid;
 207 }
 208
 209 int
 210 pwait (pid, status, flags)
 211      int pid;
 212      int *status;
 213      int flags;
 214 {
 215   /* On MSDOS each pexecute must be followed by it's associated pwait.  */
 216   if (pid != last_pid
 217       /* Called twice for the same child?  */
 218       || pid == last_reaped)
 219     {
 220       /* ??? ECHILD would be a better choice.  Can we use it here?  */
 221       errno = EINVAL;
 222       return -1;
 223     }
 224   /* ??? Here's an opportunity to canonicalize the values in STATUS.
 225      Needed?  */
 226   *status = last_status;
 227   last_reaped = last_pid;
 228   return last_pid;
 229 }
 230
 231 #endif /* MSDOS */
 232
 233 #if defined (_WIN32) && ! defined (_UWIN)
 234
 235 #include <process.h>
 236
 237 #ifdef __CYGWIN__
 238
 239 #define fix_argv(argvec) (argvec)
 240
 241 extern int _spawnv ();
 242 extern int _spawnvp ();
 243
 244 #else /* ! __CYGWIN__ */
 245
 246 /* This is a kludge to get around the Microsoft C spawn functions' propensity
 247    to remove the outermost set of double quotes from all arguments.  */
 248
 249 const char * const *
 250 fix_argv (argvec)
 251      char **argvec;
 252 {
 253   int i;
 254
 255   for (i = 1; argvec[i] != 0; i++)
 256     {
 257       int len, j;
 258       char *temp, *newtemp;
 259
 260       temp = argvec[i];
 261       len = strlen (temp);
 262       for (j = 0; j < len; j++)
 263         {
 264           if (temp[j] == '"')
 265             {
 266               newtemp = xmalloc (len + 2);
 267               strncpy (newtemp, temp, j);
 268               newtemp [j] = '\\';
 269               strncpy (&newtemp [j+1], &temp [j], len-j);
 270               newtemp [len+1] = 0;
 271               temp = newtemp;
 272               len++;
 273               j++;
 274             }
 275         }
 276
 277         argvec[i] = temp;
 278       }
 279
 280   return (const char * const *) argvec;
 281 }
 282 #endif /* __CYGWIN__ */
 283
 284 #include <io.h>
 285 #include <fcntl.h>
 286 #include <signal.h>
 287
 288 /* mingw32 headers may not define the following.  */
 289
 290 #ifndef _P_WAIT
 291 #  define _P_WAIT       0
 292 #  define _P_NOWAIT     1
 293 #  define _P_OVERLAY    2
 294 #  define _P_NOWAITO    3
 295 #  define _P_DETACH     4
 296
 297 #  define WAIT_CHILD    0
 298 #  define WAIT_GRANDCHILD       1
 299 #endif
 300
 301 /* Win32 supports pipes */
 302 int
 303 pexecute (program, argv, this_pname, temp_base, errmsg_fmt, errmsg_arg, flags)
 304      const char *program;
 305      char * const *argv;
 306      const char *this_pname;
 307      const char *temp_base;
 308      char **errmsg_fmt, **errmsg_arg;
 309      int flags;
 310 {
 311   int pid;
 312   int pdes[2], org_stdin, org_stdout;
 313   int input_desc, output_desc;
 314   int retries, sleep_interval;
 315
 316   /* Pipe waiting from last process, to be used as input for the next one.
 317      Value is STDIN_FILE_NO if no pipe is waiting
 318      (i.e. the next command is the first of a group).  */
 319   static int last_pipe_input;
 320
 321   /* If this is the first process, initialize.  */
 322   if (flags & PEXECUTE_FIRST)
 323     last_pipe_input = STDIN_FILE_NO;
 324
 325   input_desc = last_pipe_input;
 326
 327   /* If this isn't the last process, make a pipe for its output,
 328      and record it as waiting to be the input to the next process.  */
 329   if (! (flags & PEXECUTE_LAST))
 330     {
 331       if (_pipe (pdes, 256, O_BINARY) < 0)
 332         {
 333           *errmsg_fmt = "pipe";
 334           *errmsg_arg = NULL;
 335           return -1;
 336         }
 337       output_desc = pdes[WRITE_PORT];
 338       last_pipe_input = pdes[READ_PORT];
 339     }
 340   else
 341     {
 342       /* Last process.  */
 343       output_desc = STDOUT_FILE_NO;
 344       last_pipe_input = STDIN_FILE_NO;
 345     }
 346
 347   if (input_desc != STDIN_FILE_NO)
 348     {
 349       org_stdin = dup (STDIN_FILE_NO);
 350       dup2 (input_desc, STDIN_FILE_NO);
 351       close (input_desc);
 352     }
 353
 354   if (output_desc != STDOUT_FILE_NO)
 355     {
 356       org_stdout = dup (STDOUT_FILE_NO);
 357       dup2 (output_desc, STDOUT_FILE_NO);
 358       close (output_desc);
 359     }
 360
 361   pid = (flags & PEXECUTE_SEARCH ? _spawnvp : _spawnv)
 362     (_P_NOWAIT, program, fix_argv(argv));
 363
 364   if (input_desc != STDIN_FILE_NO)
 365     {
 366       dup2 (org_stdin, STDIN_FILE_NO);
 367       close (org_stdin);
 368     }
 369
 370   if (output_desc != STDOUT_FILE_NO)
 371     {
 372       dup2 (org_stdout, STDOUT_FILE_NO);
 373       close (org_stdout);
 374     }
 375
 376   if (pid == -1)
 377     {
 378       *errmsg_fmt = install_error_msg;
 379       *errmsg_arg = program;
 380       return -1;
 381     }
 382
 383   return pid;
 384 }
 385
 386 /* MS CRTDLL doesn't return enough information in status to decide if the
 387    child exited due to a signal or not, rather it simply returns an
 388    integer with the exit code of the child; eg., if the child exited with
 389    an abort() call and didn't have a handler for SIGABRT, it simply returns
 390    with status = 3. We fix the status code to conform to the usual WIF*
 391    macros. Note that WIFSIGNALED will never be true under CRTDLL. */
 392
 393 int
 394 pwait (pid, status, flags)
 395      int pid;
 396      int *status;
 397      int flags;
 398 {
 399 #ifdef __CYGWIN__
 400   return wait (status);
 401 #else
 402   int termstat;
 403
 404   pid = _cwait (&termstat, pid, WAIT_CHILD);
 405
 406   /* ??? Here's an opportunity to canonicalize the values in STATUS.
 407      Needed?  */
 408
 409   /* cwait returns the child process exit code in termstat.
 410      A value of 3 indicates that the child caught a signal, but not
 411      which one.  Since only SIGABRT, SIGFPE and SIGINT do anything, we
 412      report SIGABRT.  */
 413   if (termstat == 3)
 414     *status = SIGABRT;
 415   else
 416     *status = (((termstat) & 0xff) << 8);
 417
 418   return pid;
 419 #endif /* __CYGWIN__ */
 420 }
 421
 422 #endif /* _WIN32 && ! _UWIN */
 423
 424 #ifdef OS2
 425
 426 /* ??? Does OS2 have process.h?  */
 427 extern int spawnv ();
 428 extern int spawnvp ();
 429
 430 int
 431 pexecute (program, argv, this_pname, temp_base, errmsg_fmt, errmsg_arg, flags)
 432      const char *program;
 433      char * const *argv;
 434      const char *this_pname;
 435      const char *temp_base;
 436      char **errmsg_fmt, **errmsg_arg;
 437      int flags;
 438 {
 439   int pid;
 440
 441   if ((flags & PEXECUTE_ONE) != PEXECUTE_ONE)
 442     abort ();
 443   /* ??? Presumably 1 == _P_NOWAIT.  */
 444   pid = (flags & PEXECUTE_SEARCH ? spawnvp : spawnv) (1, program, argv);
 445   if (pid == -1)
 446     {
 447       *errmsg_fmt = install_error_msg;
 448       *errmsg_arg = program;
 449       return -1;
 450     }
 451   return pid;
 452 }
 453
 454 int
 455 pwait (pid, status, flags)
 456      int pid;
 457      int *status;
 458      int flags;
 459 {
 460   /* ??? Here's an opportunity to canonicalize the values in STATUS.
 461      Needed?  */
 462   int pid = wait (status);
 463   return pid;
 464 }
 465
 466 #endif /* OS2 */
 467
 468 #ifdef MPW
 469
 470 /* MPW pexecute doesn't actually run anything; instead, it writes out
 471    script commands that, when run, will do the actual executing.
 472
 473    For example, in GCC's case, GCC will write out several script commands:
 474
 475    cpp ...
 476    cc1 ...
 477    as ...
 478    ld ...
 479
 480    and then exit.  None of the above programs will have run yet.  The task
 481    that called GCC will then execute the script and cause cpp,etc. to run.
 482    The caller must invoke pfinish before calling exit.  This adds
 483    the finishing touches to the generated script.  */
 484
 485 static int first_time = 1;
 486
 487 int
 488 pexecute (program, argv, this_pname, temp_base, errmsg_fmt, errmsg_arg, flags)
 489      const char *program;
 490      char * const *argv;
 491      const char *this_pname;
 492      const char *temp_base;
 493      char **errmsg_fmt, **errmsg_arg;
 494      int flags;
 495 {
 496   char tmpprogram[255];
 497   char *cp, *tmpname;
 498   int i;
 499
 500   mpwify_filename (program, tmpprogram);
 501   if (first_time)
 502     {
 503       printf ("Set Failed 0\n");
 504       first_time = 0;
 505     }
 506
 507   fputs ("If {Failed} == 0\n", stdout);
 508   /* If being verbose, output a copy of the command.  It should be
 509      accurate enough and escaped enough to be "clickable".  */
 510   if (flags & PEXECUTE_VERBOSE)
 511     {
 512       fputs ("\tEcho ", stdout);
 513       fputc ('\'', stdout);
 514       fputs (tmpprogram, stdout);
 515       fputc ('\'', stdout);
 516       fputc (' ', stdout);
 517       for (i=1; argv[i]; i++)
 518         {
 519           fputc ('\'', stdout);
 520           /* See if we have an argument that needs fixing.  */
 521           if (strchr(argv[i], '/'))
 522             {
 523               tmpname = (char *) xmalloc (256);
 524               mpwify_filename (argv[i], tmpname);
 525               argv[i] = tmpname;
 526             }
 527           for (cp = argv[i]; *cp; cp++)
 528             {
 529               /* Write an Option-d escape char in front of special chars.  */
 530               if (strchr("'+", *cp))
 531                 fputc ('\266', stdout);
 532               fputc (*cp, stdout);
 533             }
 534           fputc ('\'', stdout);
 535           fputc (' ', stdout);
 536         }
 537       fputs ("\n", stdout);
 538     }
 539   fputs ("\t", stdout);
 540   fputs (tmpprogram, stdout);
 541   fputc (' ', stdout);
 542
 543   for (i=1; argv[i]; i++)
 544     {
 545       /* See if we have an argument that needs fixing.  */
 546       if (strchr(argv[i], '/'))
 547         {
 548           tmpname = (char *) xmalloc (256);
 549           mpwify_filename (argv[i], tmpname);
 550           argv[i] = tmpname;
 551         }
 552       if (strchr (argv[i], ' '))
 553         fputc ('\'', stdout);
 554       for (cp = argv[i]; *cp; cp++)
 555         {
 556           /* Write an Option-d escape char in front of special chars.  */
 557           if (strchr("'+", *cp))
 558             fputc ('\266', stdout);
 559           fputc (*cp, stdout);
 560         }
 561       if (strchr (argv[i], ' '))
 562         fputc ('\'', stdout);
 563       fputc (' ', stdout);
 564     }
 565
 566   fputs ("\n", stdout);
 567
 568   /* Output commands that arrange to clean up and exit if a failure occurs.
 569      We have to be careful to collect the status from the program that was
 570      run, rather than some other script command.  Also, we don't exit
 571      immediately, since necessary cleanups are at the end of the script.  */
 572   fputs ("\tSet TmpStatus {Status}\n", stdout);
 573   fputs ("\tIf {TmpStatus} != 0\n", stdout);
 574   fputs ("\t\tSet Failed {TmpStatus}\n", stdout);
 575   fputs ("\tEnd\n", stdout);
 576   fputs ("End\n", stdout);
 577
 578   /* We're just composing a script, can't fail here.  */
 579   return 0;
 580 }
 581
 582 int
 583 pwait (pid, status, flags)
 584      int pid;
 585      int *status;
 586      int flags;
 587 {
 588   *status = 0;
 589   return 0;
 590 }
 591
 592 /* Write out commands that will exit with the correct error code
 593    if something in the script failed.  */
 594
 595 void
 596 pfinish ()
 597 {
 598   printf ("\tExit \"{Failed}\"\n");
 599 }
 600
 601 #endif /* MPW */
 602
 603 /* include for Unix-like environments but not for Dos-like environments */
 604 #if ! defined (__MSDOS__) && ! defined (OS2) && ! defined (MPW) \
 605     && ! (defined (_WIN32) && ! defined (_UWIN))
 606
 607 extern int execv ();
 608 extern int execvp ();
 609
 610 int
 611 pexecute (program, argv, this_pname, temp_base, errmsg_fmt, errmsg_arg, flags)
 612      const char *program;
 613      char * const *argv;
 614      const char *this_pname;
 615      const char *temp_base;
 616      char **errmsg_fmt, **errmsg_arg;
 617      int flags;
 618 {
 619   int (*func)() = (flags & PEXECUTE_SEARCH ? execvp : execv);
 620   int pid;
 621   int pdes[2];
 622   int input_desc, output_desc;
 623   int retries, sleep_interval;
 624   /* Pipe waiting from last process, to be used as input for the next one.
 625      Value is STDIN_FILE_NO if no pipe is waiting
 626      (i.e. the next command is the first of a group).  */
 627   static int last_pipe_input;
 628
 629   /* If this is the first process, initialize.  */
 630   if (flags & PEXECUTE_FIRST)
 631     last_pipe_input = STDIN_FILE_NO;
 632
 633   input_desc = last_pipe_input;
 634
 635   /* If this isn't the last process, make a pipe for its output,
 636      and record it as waiting to be the input to the next process.  */
 637   if (! (flags & PEXECUTE_LAST))
 638     {
 639       if (pipe (pdes) < 0)
 640         {
 641           *errmsg_fmt = "pipe";
 642           *errmsg_arg = NULL;
 643           return -1;
 644         }
 645       output_desc = pdes[WRITE_PORT];
 646       last_pipe_input = pdes[READ_PORT];
 647     }
 648   else
 649     {
 650       /* Last process.  */
 651       output_desc = STDOUT_FILE_NO;
 652       last_pipe_input = STDIN_FILE_NO;
 653     }
 654
 655   /* Fork a subprocess; wait and retry if it fails.  */
 656   sleep_interval = 1;
 657   for (retries = 0; retries < 4; retries++)
 658     {
 659       pid = vfork ();
 660       if (pid >= 0)
 661         break;
 662       sleep (sleep_interval);
 663       sleep_interval *= 2;
 664     }
 665
 666   switch (pid)
 667     {
 668     case -1:
 669       {
 670         *errmsg_fmt = VFORK_STRING;
 671         *errmsg_arg = NULL;
 672         return -1;
 673       }
 674
 675     case 0: /* child */
 676       /* Move the input and output pipes into place, if necessary.  */
 677       if (input_desc != STDIN_FILE_NO)
 678         {
 679           close (STDIN_FILE_NO);
 680           dup (input_desc);
 681           close (input_desc);
 682         }
 683       if (output_desc != STDOUT_FILE_NO)
 684         {
 685           close (STDOUT_FILE_NO);
 686           dup (output_desc);
 687           close (output_desc);
 688         }
 689
 690       /* Close the parent's descs that aren't wanted here.  */
 691       if (last_pipe_input != STDIN_FILE_NO)
 692         close (last_pipe_input);
 693
 694       /* Exec the program.  */
 695       (*func) (program, argv);
 696
 697       /* Note: Calling fprintf and exit here doesn't seem right for vfork.  */
 698       fprintf (stderr, "%s: ", this_pname);
 699       fprintf (stderr, install_error_msg, program);
 700       fprintf (stderr, ": %s\n", xstrerror (errno));
 701       exit (-1);
 702       /* NOTREACHED */
 703       return 0;
 704
 705     default:
 706       /* In the parent, after forking.
 707          Close the descriptors that we made for this child.  */
 708       if (input_desc != STDIN_FILE_NO)
 709         close (input_desc);
 710       if (output_desc != STDOUT_FILE_NO)
 711         close (output_desc);
 712
 713       /* Return child's process number.  */
 714       return pid;
 715     }
 716 }
 717
 718 int
 719 pwait (pid, status, flags)
 720      int pid;
 721      int *status;
 722      int flags;
 723 {
 724   /* ??? Here's an opportunity to canonicalize the values in STATUS.
 725      Needed?  */
 726 #ifdef VMS
 727   pid = waitpid (-1, status, 0);
 728 #else
 729   pid = wait (status);
 730 #endif
 731   return pid;
 732 }
 733
 734 #endif /* ! __MSDOS__ && ! OS2 && ! MPW && ! (_WIN32 && ! _UWIN) */