| 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 | #if !defined (__CYGWIN__) && defined (__CYGWIN32__) |
| 56 | #define __CYGWIN__ 1 |
| 57 | #endif |
| 58 | |
| 59 | /* stdin file number. */ |
| 60 | #define STDIN_FILE_NO 0 |
| 61 | |
| 62 | /* stdout file number. */ |
| 63 | #define STDOUT_FILE_NO 1 |
| 64 | |
| 65 | /* value of `pipe': port index for reading. */ |
| 66 | #define READ_PORT 0 |
| 67 | |
| 68 | /* value of `pipe': port index for writing. */ |
| 69 | #define WRITE_PORT 1 |
| 70 | |
| 71 | static char *install_error_msg = "installation problem, cannot exec `%s'"; |
| 72 | |
| 73 | /* pexecute: execute a program. |
| 74 | |
| 75 | PROGRAM and ARGV are the arguments to execv/execvp. |
| 76 | |
| 77 | THIS_PNAME is name of the calling program (i.e. argv[0]). |
| 78 | |
| 79 | TEMP_BASE is the path name, sans suffix, of a temporary file to use |
| 80 | if needed. This is currently only needed for MSDOS ports that don't use |
| 81 | GO32 (do any still exist?). Ports that don't need it can pass NULL. |
| 82 | |
| 83 | (FLAGS & PEXECUTE_SEARCH) is non-zero if $PATH should be searched |
| 84 | (??? It's not clear that GCC passes this flag correctly). |
| 85 | (FLAGS & PEXECUTE_FIRST) is nonzero for the first process in chain. |
| 86 | (FLAGS & PEXECUTE_FIRST) is nonzero for the last process in chain. |
| 87 | FIRST_LAST could be simplified to only mark the last of a chain of processes |
| 88 | but that requires the caller to always mark the last one (and not give up |
| 89 | early if some error occurs). It's more robust to require the caller to |
| 90 | mark both ends of the chain. |
| 91 | |
| 92 | The result is the pid on systems like Unix where we fork/exec and on systems |
| 93 | like WIN32 and OS2 where we use spawn. It is up to the caller to wait for |
| 94 | the child. |
| 95 | |
| 96 | The result is the WEXITSTATUS on systems like MSDOS where we spawn and wait |
| 97 | for the child here. |
| 98 | |
| 99 | Upon failure, ERRMSG_FMT and ERRMSG_ARG are set to the text of the error |
| 100 | message with an optional argument (if not needed, ERRMSG_ARG is set to |
| 101 | NULL), and -1 is returned. `errno' is available to the caller to use. |
| 102 | |
| 103 | pwait: cover function for wait. |
| 104 | |
| 105 | PID is the process id of the task to wait for. |
| 106 | STATUS is the `status' argument to wait. |
| 107 | FLAGS is currently unused (allows future enhancement without breaking |
| 108 | upward compatibility). Pass 0 for now. |
| 109 | |
| 110 | The result is the pid of the child reaped, |
| 111 | or -1 for failure (errno says why). |
| 112 | |
| 113 | On systems that don't support waiting for a particular child, PID is |
| 114 | ignored. On systems like MSDOS that don't really multitask pwait |
| 115 | is just a mechanism to provide a consistent interface for the caller. |
| 116 | |
| 117 | pfinish: finish generation of script |
| 118 | |
| 119 | pfinish is necessary for systems like MPW where a script is generated that |
| 120 | runs the requested programs. |
| 121 | */ |
| 122 | |
| 123 | #ifdef __MSDOS__ |
| 124 | |
| 125 | /* MSDOS doesn't multitask, but for the sake of a consistent interface |
| 126 | the code behaves like it does. pexecute runs the program, tucks the |
| 127 | exit code away, and returns a "pid". pwait must be called to fetch the |
| 128 | exit code. */ |
| 129 | |
| 130 | #include <process.h> |
| 131 | |
| 132 | /* For communicating information from pexecute to pwait. */ |
| 133 | static int last_pid = 0; |
| 134 | static int last_status = 0; |
| 135 | static int last_reaped = 0; |
| 136 | |
| 137 | int |
| 138 | pexecute (program, argv, this_pname, temp_base, errmsg_fmt, errmsg_arg, flags) |
| 139 | const char *program; |
| 140 | char * const *argv; |
| 141 | const char *this_pname; |
| 142 | const char *temp_base; |
| 143 | char **errmsg_fmt, **errmsg_arg; |
| 144 | int flags; |
| 145 | { |
| 146 | int rc; |
| 147 | |
| 148 | last_pid++; |
| 149 | if (last_pid < 0) |
| 150 | last_pid = 1; |
| 151 | |
| 152 | if ((flags & PEXECUTE_ONE) != PEXECUTE_ONE) |
| 153 | abort (); |
| 154 | |
| 155 | #ifdef __GO32__ |
| 156 | /* ??? What are the possible return values from spawnv? */ |
| 157 | rc = (flags & PEXECUTE_SEARCH ? spawnvp : spawnv) (1, program, argv); |
| 158 | #else |
| 159 | char *scmd, *rf; |
| 160 | FILE *argfile; |
| 161 | int i, el = flags & PEXECUTE_SEARCH ? 4 : 0; |
| 162 | |
| 163 | scmd = (char *) xmalloc (strlen (program) + strlen (temp_base) + 6 + el); |
| 164 | rf = scmd + strlen(program) + 2 + el; |
| 165 | sprintf (scmd, "%s%s @%s.gp", program, |
| 166 | (flags & PEXECUTE_SEARCH ? ".exe" : ""), temp_base); |
| 167 | argfile = fopen (rf, "w"); |
| 168 | if (argfile == 0) |
| 169 | { |
| 170 | int errno_save = errno; |
| 171 | free (scmd); |
| 172 | errno = errno_save; |
| 173 | *errmsg_fmt = "cannot open `%s.gp'"; |
| 174 | *errmsg_arg = temp_base; |
| 175 | return -1; |
| 176 | } |
| 177 | |
| 178 | for (i=1; argv[i]; i++) |
| 179 | { |
| 180 | char *cp; |
| 181 | for (cp = argv[i]; *cp; cp++) |
| 182 | { |
| 183 | if (*cp == '"' || *cp == '\'' || *cp == '\\' || ISSPACE (*cp)) |
| 184 | fputc ('\\', argfile); |
| 185 | fputc (*cp, argfile); |
| 186 | } |
| 187 | fputc ('\n', argfile); |
| 188 | } |
| 189 | fclose (argfile); |
| 190 | |
| 191 | rc = system (scmd); |
| 192 | |
| 193 | { |
| 194 | int errno_save = errno; |
| 195 | remove (rf); |
| 196 | free (scmd); |
| 197 | errno = errno_save; |
| 198 | } |
| 199 | #endif |
| 200 | |
| 201 | if (rc == -1) |
| 202 | { |
| 203 | *errmsg_fmt = install_error_msg; |
| 204 | *errmsg_arg = program; |
| 205 | return -1; |
| 206 | } |
| 207 | |
| 208 | /* Tuck the status away for pwait, and return a "pid". */ |
| 209 | last_status = rc << 8; |
| 210 | return last_pid; |
| 211 | } |
| 212 | |
| 213 | int |
| 214 | pwait (pid, status, flags) |
| 215 | int pid; |
| 216 | int *status; |
| 217 | int flags; |
| 218 | { |
| 219 | /* On MSDOS each pexecute must be followed by it's associated pwait. */ |
| 220 | if (pid != last_pid |
| 221 | /* Called twice for the same child? */ |
| 222 | || pid == last_reaped) |
| 223 | { |
| 224 | /* ??? ECHILD would be a better choice. Can we use it here? */ |
| 225 | errno = EINVAL; |
| 226 | return -1; |
| 227 | } |
| 228 | /* ??? Here's an opportunity to canonicalize the values in STATUS. |
| 229 | Needed? */ |
| 230 | *status = last_status; |
| 231 | last_reaped = last_pid; |
| 232 | return last_pid; |
| 233 | } |
| 234 | |
| 235 | #endif /* MSDOS */ |
| 236 | |
| 237 | #if defined (_WIN32) && ! defined (__UWIN__) |
| 238 | |
| 239 | #include <process.h> |
| 240 | |
| 241 | #ifdef __CYGWIN__ |
| 242 | |
| 243 | #define fix_argv(argvec) (argvec) |
| 244 | |
| 245 | extern int _spawnv (); |
| 246 | extern int _spawnvp (); |
| 247 | |
| 248 | #else /* ! __CYGWIN__ */ |
| 249 | |
| 250 | /* This is a kludge to get around the Microsoft C spawn functions' propensity |
| 251 | to remove the outermost set of double quotes from all arguments. */ |
| 252 | |
| 253 | const char * const * |
| 254 | fix_argv (argvec) |
| 255 | char **argvec; |
| 256 | { |
| 257 | int i; |
| 258 | |
| 259 | for (i = 1; argvec[i] != 0; i++) |
| 260 | { |
| 261 | int len, j; |
| 262 | char *temp, *newtemp; |
| 263 | |
| 264 | temp = argvec[i]; |
| 265 | len = strlen (temp); |
| 266 | for (j = 0; j < len; j++) |
| 267 | { |
| 268 | if (temp[j] == '"') |
| 269 | { |
| 270 | newtemp = xmalloc (len + 2); |
| 271 | strncpy (newtemp, temp, j); |
| 272 | newtemp [j] = '\\'; |
| 273 | strncpy (&newtemp [j+1], &temp [j], len-j); |
| 274 | newtemp [len+1] = 0; |
| 275 | temp = newtemp; |
| 276 | len++; |
| 277 | j++; |
| 278 | } |
| 279 | } |
| 280 | |
| 281 | argvec[i] = temp; |
| 282 | } |
| 283 | |
| 284 | return (const char * const *) argvec; |
| 285 | } |
| 286 | #endif /* __CYGWIN__ */ |
| 287 | |
| 288 | #include <io.h> |
| 289 | #include <fcntl.h> |
| 290 | #include <signal.h> |
| 291 | |
| 292 | /* mingw32 headers may not define the following. */ |
| 293 | |
| 294 | #ifndef _P_WAIT |
| 295 | # define _P_WAIT 0 |
| 296 | # define _P_NOWAIT 1 |
| 297 | # define _P_OVERLAY 2 |
| 298 | # define _P_NOWAITO 3 |
| 299 | # define _P_DETACH 4 |
| 300 | |
| 301 | # define WAIT_CHILD 0 |
| 302 | # define WAIT_GRANDCHILD 1 |
| 303 | #endif |
| 304 | |
| 305 | /* Win32 supports pipes */ |
| 306 | int |
| 307 | pexecute (program, argv, this_pname, temp_base, errmsg_fmt, errmsg_arg, flags) |
| 308 | const char *program; |
| 309 | char * const *argv; |
| 310 | const char *this_pname; |
| 311 | const char *temp_base; |
| 312 | char **errmsg_fmt, **errmsg_arg; |
| 313 | int flags; |
| 314 | { |
| 315 | int pid; |
| 316 | int pdes[2], org_stdin, org_stdout; |
| 317 | int input_desc, output_desc; |
| 318 | int retries, sleep_interval; |
| 319 | |
| 320 | /* Pipe waiting from last process, to be used as input for the next one. |
| 321 | Value is STDIN_FILE_NO if no pipe is waiting |
| 322 | (i.e. the next command is the first of a group). */ |
| 323 | static int last_pipe_input; |
| 324 | |
| 325 | /* If this is the first process, initialize. */ |
| 326 | if (flags & PEXECUTE_FIRST) |
| 327 | last_pipe_input = STDIN_FILE_NO; |
| 328 | |
| 329 | input_desc = last_pipe_input; |
| 330 | |
| 331 | /* If this isn't the last process, make a pipe for its output, |
| 332 | and record it as waiting to be the input to the next process. */ |
| 333 | if (! (flags & PEXECUTE_LAST)) |
| 334 | { |
| 335 | if (_pipe (pdes, 256, O_BINARY) < 0) |
| 336 | { |
| 337 | *errmsg_fmt = "pipe"; |
| 338 | *errmsg_arg = NULL; |
| 339 | return -1; |
| 340 | } |
| 341 | output_desc = pdes[WRITE_PORT]; |
| 342 | last_pipe_input = pdes[READ_PORT]; |
| 343 | } |
| 344 | else |
| 345 | { |
| 346 | /* Last process. */ |
| 347 | output_desc = STDOUT_FILE_NO; |
| 348 | last_pipe_input = STDIN_FILE_NO; |
| 349 | } |
| 350 | |
| 351 | if (input_desc != STDIN_FILE_NO) |
| 352 | { |
| 353 | org_stdin = dup (STDIN_FILE_NO); |
| 354 | dup2 (input_desc, STDIN_FILE_NO); |
| 355 | close (input_desc); |
| 356 | } |
| 357 | |
| 358 | if (output_desc != STDOUT_FILE_NO) |
| 359 | { |
| 360 | org_stdout = dup (STDOUT_FILE_NO); |
| 361 | dup2 (output_desc, STDOUT_FILE_NO); |
| 362 | close (output_desc); |
| 363 | } |
| 364 | |
| 365 | pid = (flags & PEXECUTE_SEARCH ? _spawnvp : _spawnv) |
| 366 | (_P_NOWAIT, program, fix_argv(argv)); |
| 367 | |
| 368 | if (input_desc != STDIN_FILE_NO) |
| 369 | { |
| 370 | dup2 (org_stdin, STDIN_FILE_NO); |
| 371 | close (org_stdin); |
| 372 | } |
| 373 | |
| 374 | if (output_desc != STDOUT_FILE_NO) |
| 375 | { |
| 376 | dup2 (org_stdout, STDOUT_FILE_NO); |
| 377 | close (org_stdout); |
| 378 | } |
| 379 | |
| 380 | if (pid == -1) |
| 381 | { |
| 382 | *errmsg_fmt = install_error_msg; |
| 383 | *errmsg_arg = program; |
| 384 | return -1; |
| 385 | } |
| 386 | |
| 387 | return pid; |
| 388 | } |
| 389 | |
| 390 | /* MS CRTDLL doesn't return enough information in status to decide if the |
| 391 | child exited due to a signal or not, rather it simply returns an |
| 392 | integer with the exit code of the child; eg., if the child exited with |
| 393 | an abort() call and didn't have a handler for SIGABRT, it simply returns |
| 394 | with status = 3. We fix the status code to conform to the usual WIF* |
| 395 | macros. Note that WIFSIGNALED will never be true under CRTDLL. */ |
| 396 | |
| 397 | int |
| 398 | pwait (pid, status, flags) |
| 399 | int pid; |
| 400 | int *status; |
| 401 | int flags; |
| 402 | { |
| 403 | #ifdef __CYGWIN__ |
| 404 | return wait (status); |
| 405 | #else |
| 406 | int termstat; |
| 407 | |
| 408 | pid = _cwait (&termstat, pid, WAIT_CHILD); |
| 409 | |
| 410 | /* ??? Here's an opportunity to canonicalize the values in STATUS. |
| 411 | Needed? */ |
| 412 | |
| 413 | /* cwait returns the child process exit code in termstat. |
| 414 | A value of 3 indicates that the child caught a signal, but not |
| 415 | which one. Since only SIGABRT, SIGFPE and SIGINT do anything, we |
| 416 | report SIGABRT. */ |
| 417 | if (termstat == 3) |
| 418 | *status = SIGABRT; |
| 419 | else |
| 420 | *status = (((termstat) & 0xff) << 8); |
| 421 | |
| 422 | return pid; |
| 423 | #endif /* __CYGWIN__ */ |
| 424 | } |
| 425 | |
| 426 | #endif /* _WIN32 && ! __UWIN__ */ |
| 427 | |
| 428 | #ifdef OS2 |
| 429 | |
| 430 | /* ??? Does OS2 have process.h? */ |
| 431 | extern int spawnv (); |
| 432 | extern int spawnvp (); |
| 433 | |
| 434 | int |
| 435 | pexecute (program, argv, this_pname, temp_base, errmsg_fmt, errmsg_arg, flags) |
| 436 | const char *program; |
| 437 | char * const *argv; |
| 438 | const char *this_pname; |
| 439 | const char *temp_base; |
| 440 | char **errmsg_fmt, **errmsg_arg; |
| 441 | int flags; |
| 442 | { |
| 443 | int pid; |
| 444 | |
| 445 | if ((flags & PEXECUTE_ONE) != PEXECUTE_ONE) |
| 446 | abort (); |
| 447 | /* ??? Presumably 1 == _P_NOWAIT. */ |
| 448 | pid = (flags & PEXECUTE_SEARCH ? spawnvp : spawnv) (1, program, argv); |
| 449 | if (pid == -1) |
| 450 | { |
| 451 | *errmsg_fmt = install_error_msg; |
| 452 | *errmsg_arg = program; |
| 453 | return -1; |
| 454 | } |
| 455 | return pid; |
| 456 | } |
| 457 | |
| 458 | int |
| 459 | pwait (pid, status, flags) |
| 460 | int pid; |
| 461 | int *status; |
| 462 | int flags; |
| 463 | { |
| 464 | /* ??? Here's an opportunity to canonicalize the values in STATUS. |
| 465 | Needed? */ |
| 466 | int pid = wait (status); |
| 467 | return pid; |
| 468 | } |
| 469 | |
| 470 | #endif /* OS2 */ |
| 471 | |
| 472 | #ifdef MPW |
| 473 | |
| 474 | /* MPW pexecute doesn't actually run anything; instead, it writes out |
| 475 | script commands that, when run, will do the actual executing. |
| 476 | |
| 477 | For example, in GCC's case, GCC will write out several script commands: |
| 478 | |
| 479 | cpp ... |
| 480 | cc1 ... |
| 481 | as ... |
| 482 | ld ... |
| 483 | |
| 484 | and then exit. None of the above programs will have run yet. The task |
| 485 | that called GCC will then execute the script and cause cpp,etc. to run. |
| 486 | The caller must invoke pfinish before calling exit. This adds |
| 487 | the finishing touches to the generated script. */ |
| 488 | |
| 489 | static int first_time = 1; |
| 490 | |
| 491 | int |
| 492 | pexecute (program, argv, this_pname, temp_base, errmsg_fmt, errmsg_arg, flags) |
| 493 | const char *program; |
| 494 | char * const *argv; |
| 495 | const char *this_pname; |
| 496 | const char *temp_base; |
| 497 | char **errmsg_fmt, **errmsg_arg; |
| 498 | int flags; |
| 499 | { |
| 500 | char tmpprogram[255]; |
| 501 | char *cp, *tmpname; |
| 502 | int i; |
| 503 | |
| 504 | mpwify_filename (program, tmpprogram); |
| 505 | if (first_time) |
| 506 | { |
| 507 | printf ("Set Failed 0\n"); |
| 508 | first_time = 0; |
| 509 | } |
| 510 | |
| 511 | fputs ("If {Failed} == 0\n", stdout); |
| 512 | /* If being verbose, output a copy of the command. It should be |
| 513 | accurate enough and escaped enough to be "clickable". */ |
| 514 | if (flags & PEXECUTE_VERBOSE) |
| 515 | { |
| 516 | fputs ("\tEcho ", stdout); |
| 517 | fputc ('\'', stdout); |
| 518 | fputs (tmpprogram, stdout); |
| 519 | fputc ('\'', stdout); |
| 520 | fputc (' ', stdout); |
| 521 | for (i=1; argv[i]; i++) |
| 522 | { |
| 523 | fputc ('\'', stdout); |
| 524 | /* See if we have an argument that needs fixing. */ |
| 525 | if (strchr(argv[i], '/')) |
| 526 | { |
| 527 | tmpname = (char *) xmalloc (256); |
| 528 | mpwify_filename (argv[i], tmpname); |
| 529 | argv[i] = tmpname; |
| 530 | } |
| 531 | for (cp = argv[i]; *cp; cp++) |
| 532 | { |
| 533 | /* Write an Option-d escape char in front of special chars. */ |
| 534 | if (strchr("'+", *cp)) |
| 535 | fputc ('\266', stdout); |
| 536 | fputc (*cp, stdout); |
| 537 | } |
| 538 | fputc ('\'', stdout); |
| 539 | fputc (' ', stdout); |
| 540 | } |
| 541 | fputs ("\n", stdout); |
| 542 | } |
| 543 | fputs ("\t", stdout); |
| 544 | fputs (tmpprogram, stdout); |
| 545 | fputc (' ', stdout); |
| 546 | |
| 547 | for (i=1; argv[i]; i++) |
| 548 | { |
| 549 | /* See if we have an argument that needs fixing. */ |
| 550 | if (strchr(argv[i], '/')) |
| 551 | { |
| 552 | tmpname = (char *) xmalloc (256); |
| 553 | mpwify_filename (argv[i], tmpname); |
| 554 | argv[i] = tmpname; |
| 555 | } |
| 556 | if (strchr (argv[i], ' ')) |
| 557 | fputc ('\'', stdout); |
| 558 | for (cp = argv[i]; *cp; cp++) |
| 559 | { |
| 560 | /* Write an Option-d escape char in front of special chars. */ |
| 561 | if (strchr("'+", *cp)) |
| 562 | fputc ('\266', stdout); |
| 563 | fputc (*cp, stdout); |
| 564 | } |
| 565 | if (strchr (argv[i], ' ')) |
| 566 | fputc ('\'', stdout); |
| 567 | fputc (' ', stdout); |
| 568 | } |
| 569 | |
| 570 | fputs ("\n", stdout); |
| 571 | |
| 572 | /* Output commands that arrange to clean up and exit if a failure occurs. |
| 573 | We have to be careful to collect the status from the program that was |
| 574 | run, rather than some other script command. Also, we don't exit |
| 575 | immediately, since necessary cleanups are at the end of the script. */ |
| 576 | fputs ("\tSet TmpStatus {Status}\n", stdout); |
| 577 | fputs ("\tIf {TmpStatus} != 0\n", stdout); |
| 578 | fputs ("\t\tSet Failed {TmpStatus}\n", stdout); |
| 579 | fputs ("\tEnd\n", stdout); |
| 580 | fputs ("End\n", stdout); |
| 581 | |
| 582 | /* We're just composing a script, can't fail here. */ |
| 583 | return 0; |
| 584 | } |
| 585 | |
| 586 | int |
| 587 | pwait (pid, status, flags) |
| 588 | int pid; |
| 589 | int *status; |
| 590 | int flags; |
| 591 | { |
| 592 | *status = 0; |
| 593 | return 0; |
| 594 | } |
| 595 | |
| 596 | /* Write out commands that will exit with the correct error code |
| 597 | if something in the script failed. */ |
| 598 | |
| 599 | void |
| 600 | pfinish () |
| 601 | { |
| 602 | printf ("\tExit \"{Failed}\"\n"); |
| 603 | } |
| 604 | |
| 605 | #endif /* MPW */ |
| 606 | |
| 607 | /* include for Unix-like environments but not for Dos-like environments */ |
| 608 | #if ! defined (__MSDOS__) && ! defined (OS2) && ! defined (MPW) \ |
| 609 | && ! (defined (_WIN32) && ! defined (__UWIN__)) |
| 610 | |
| 611 | extern int execv (); |
| 612 | extern int execvp (); |
| 613 | |
| 614 | int |
| 615 | pexecute (program, argv, this_pname, temp_base, errmsg_fmt, errmsg_arg, flags) |
| 616 | const char *program; |
| 617 | char * const *argv; |
| 618 | const char *this_pname; |
| 619 | const char *temp_base ATTRIBUTE_UNUSED; |
| 620 | char **errmsg_fmt, **errmsg_arg; |
| 621 | int flags; |
| 622 | { |
| 623 | int (*func)() = (flags & PEXECUTE_SEARCH ? execvp : execv); |
| 624 | int pid; |
| 625 | int pdes[2]; |
| 626 | int input_desc, output_desc; |
| 627 | int retries, sleep_interval; |
| 628 | /* Pipe waiting from last process, to be used as input for the next one. |
| 629 | Value is STDIN_FILE_NO if no pipe is waiting |
| 630 | (i.e. the next command is the first of a group). */ |
| 631 | static int last_pipe_input; |
| 632 | |
| 633 | /* If this is the first process, initialize. */ |
| 634 | if (flags & PEXECUTE_FIRST) |
| 635 | last_pipe_input = STDIN_FILE_NO; |
| 636 | |
| 637 | input_desc = last_pipe_input; |
| 638 | |
| 639 | /* If this isn't the last process, make a pipe for its output, |
| 640 | and record it as waiting to be the input to the next process. */ |
| 641 | if (! (flags & PEXECUTE_LAST)) |
| 642 | { |
| 643 | if (pipe (pdes) < 0) |
| 644 | { |
| 645 | *errmsg_fmt = "pipe"; |
| 646 | *errmsg_arg = NULL; |
| 647 | return -1; |
| 648 | } |
| 649 | output_desc = pdes[WRITE_PORT]; |
| 650 | last_pipe_input = pdes[READ_PORT]; |
| 651 | } |
| 652 | else |
| 653 | { |
| 654 | /* Last process. */ |
| 655 | output_desc = STDOUT_FILE_NO; |
| 656 | last_pipe_input = STDIN_FILE_NO; |
| 657 | } |
| 658 | |
| 659 | /* Fork a subprocess; wait and retry if it fails. */ |
| 660 | sleep_interval = 1; |
| 661 | for (retries = 0; retries < 4; retries++) |
| 662 | { |
| 663 | pid = vfork (); |
| 664 | if (pid >= 0) |
| 665 | break; |
| 666 | sleep (sleep_interval); |
| 667 | sleep_interval *= 2; |
| 668 | } |
| 669 | |
| 670 | switch (pid) |
| 671 | { |
| 672 | case -1: |
| 673 | { |
| 674 | *errmsg_fmt = VFORK_STRING; |
| 675 | *errmsg_arg = NULL; |
| 676 | return -1; |
| 677 | } |
| 678 | |
| 679 | case 0: /* child */ |
| 680 | /* Move the input and output pipes into place, if necessary. */ |
| 681 | if (input_desc != STDIN_FILE_NO) |
| 682 | { |
| 683 | close (STDIN_FILE_NO); |
| 684 | dup (input_desc); |
| 685 | close (input_desc); |
| 686 | } |
| 687 | if (output_desc != STDOUT_FILE_NO) |
| 688 | { |
| 689 | close (STDOUT_FILE_NO); |
| 690 | dup (output_desc); |
| 691 | close (output_desc); |
| 692 | } |
| 693 | |
| 694 | /* Close the parent's descs that aren't wanted here. */ |
| 695 | if (last_pipe_input != STDIN_FILE_NO) |
| 696 | close (last_pipe_input); |
| 697 | |
| 698 | /* Exec the program. */ |
| 699 | (*func) (program, argv); |
| 700 | |
| 701 | /* Note: Calling fprintf and exit here doesn't seem right for vfork. */ |
| 702 | fprintf (stderr, "%s: ", this_pname); |
| 703 | fprintf (stderr, install_error_msg, program); |
| 704 | fprintf (stderr, ": %s\n", xstrerror (errno)); |
| 705 | exit (-1); |
| 706 | /* NOTREACHED */ |
| 707 | return 0; |
| 708 | |
| 709 | default: |
| 710 | /* In the parent, after forking. |
| 711 | Close the descriptors that we made for this child. */ |
| 712 | if (input_desc != STDIN_FILE_NO) |
| 713 | close (input_desc); |
| 714 | if (output_desc != STDOUT_FILE_NO) |
| 715 | close (output_desc); |
| 716 | |
| 717 | /* Return child's process number. */ |
| 718 | return pid; |
| 719 | } |
| 720 | } |
| 721 | |
| 722 | int |
| 723 | pwait (pid, status, flags) |
| 724 | int pid; |
| 725 | int *status; |
| 726 | int flags ATTRIBUTE_UNUSED; |
| 727 | { |
| 728 | /* ??? Here's an opportunity to canonicalize the values in STATUS. |
| 729 | Needed? */ |
| 730 | #ifdef VMS |
| 731 | pid = waitpid (-1, status, 0); |
| 732 | #else |
| 733 | pid = wait (status); |
| 734 | #endif |
| 735 | return pid; |
| 736 | } |
| 737 | |
| 738 | #endif /* ! __MSDOS__ && ! OS2 && ! MPW && ! (_WIN32 && ! __UWIN__) */ |