Commit | Line | Data |
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252b5132 RH |
1 | /* Utilities to execute a program in a subprocess (possibly linked by pipes |
2 | with other subprocesses), and wait for it. | |
0c0a36a4 | 3 | Copyright (C) 1996-2000 Free Software Foundation, Inc. |
252b5132 RH |
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> | |
7d3ffcaf JL |
32 | #ifdef NEED_DECLARATION_ERRNO |
33 | extern int errno; | |
34 | #endif | |
0c0a36a4 ILT |
35 | #ifdef HAVE_STRING_H |
36 | #include <string.h> | |
37 | #endif | |
252b5132 RH |
38 | #ifdef HAVE_UNISTD_H |
39 | #include <unistd.h> | |
40 | #endif | |
5c82d20a ZW |
41 | #ifdef HAVE_STDLIB_H |
42 | #include <stdlib.h> | |
43 | #endif | |
252b5132 RH |
44 | #define ISSPACE (x) isspace(x) |
45 | #ifdef HAVE_SYS_WAIT_H | |
46 | #include <sys/wait.h> | |
47 | #endif | |
48 | ||
49 | #ifdef vfork /* Autoconf may define this to fork for us. */ | |
50 | # define VFORK_STRING "fork" | |
51 | #else | |
52 | # define VFORK_STRING "vfork" | |
53 | #endif | |
54 | #ifdef HAVE_VFORK_H | |
55 | #include <vfork.h> | |
56 | #endif | |
57 | #ifdef VMS | |
58 | #define vfork() (decc$$alloc_vfork_blocks() >= 0 ? \ | |
59 | lib$get_current_invo_context(decc$$get_vfork_jmpbuf()) : -1) | |
60 | #endif /* VMS */ | |
61 | ||
62 | #include "libiberty.h" | |
63 | ||
252b5132 RH |
64 | /* stdin file number. */ |
65 | #define STDIN_FILE_NO 0 | |
66 | ||
67 | /* stdout file number. */ | |
68 | #define STDOUT_FILE_NO 1 | |
69 | ||
70 | /* value of `pipe': port index for reading. */ | |
71 | #define READ_PORT 0 | |
72 | ||
73 | /* value of `pipe': port index for writing. */ | |
74 | #define WRITE_PORT 1 | |
75 | ||
76 | static char *install_error_msg = "installation problem, cannot exec `%s'"; | |
77 | ||
78 | /* pexecute: execute a program. | |
79 | ||
80 | PROGRAM and ARGV are the arguments to execv/execvp. | |
81 | ||
82 | THIS_PNAME is name of the calling program (i.e. argv[0]). | |
83 | ||
84 | TEMP_BASE is the path name, sans suffix, of a temporary file to use | |
85 | if needed. This is currently only needed for MSDOS ports that don't use | |
86 | GO32 (do any still exist?). Ports that don't need it can pass NULL. | |
87 | ||
88 | (FLAGS & PEXECUTE_SEARCH) is non-zero if $PATH should be searched | |
89 | (??? It's not clear that GCC passes this flag correctly). | |
90 | (FLAGS & PEXECUTE_FIRST) is nonzero for the first process in chain. | |
91 | (FLAGS & PEXECUTE_FIRST) is nonzero for the last process in chain. | |
92 | FIRST_LAST could be simplified to only mark the last of a chain of processes | |
93 | but that requires the caller to always mark the last one (and not give up | |
94 | early if some error occurs). It's more robust to require the caller to | |
95 | mark both ends of the chain. | |
96 | ||
97 | The result is the pid on systems like Unix where we fork/exec and on systems | |
98 | like WIN32 and OS2 where we use spawn. It is up to the caller to wait for | |
99 | the child. | |
100 | ||
101 | The result is the WEXITSTATUS on systems like MSDOS where we spawn and wait | |
102 | for the child here. | |
103 | ||
104 | Upon failure, ERRMSG_FMT and ERRMSG_ARG are set to the text of the error | |
105 | message with an optional argument (if not needed, ERRMSG_ARG is set to | |
106 | NULL), and -1 is returned. `errno' is available to the caller to use. | |
107 | ||
108 | pwait: cover function for wait. | |
109 | ||
110 | PID is the process id of the task to wait for. | |
111 | STATUS is the `status' argument to wait. | |
112 | FLAGS is currently unused (allows future enhancement without breaking | |
113 | upward compatibility). Pass 0 for now. | |
114 | ||
115 | The result is the pid of the child reaped, | |
116 | or -1 for failure (errno says why). | |
117 | ||
118 | On systems that don't support waiting for a particular child, PID is | |
119 | ignored. On systems like MSDOS that don't really multitask pwait | |
120 | is just a mechanism to provide a consistent interface for the caller. | |
121 | ||
122 | pfinish: finish generation of script | |
123 | ||
124 | pfinish is necessary for systems like MPW where a script is generated that | |
125 | runs the requested programs. | |
126 | */ | |
127 | ||
128 | #ifdef __MSDOS__ | |
129 | ||
130 | /* MSDOS doesn't multitask, but for the sake of a consistent interface | |
131 | the code behaves like it does. pexecute runs the program, tucks the | |
132 | exit code away, and returns a "pid". pwait must be called to fetch the | |
133 | exit code. */ | |
134 | ||
135 | #include <process.h> | |
136 | ||
137 | /* For communicating information from pexecute to pwait. */ | |
138 | static int last_pid = 0; | |
139 | static int last_status = 0; | |
140 | static int last_reaped = 0; | |
141 | ||
142 | int | |
143 | pexecute (program, argv, this_pname, temp_base, errmsg_fmt, errmsg_arg, flags) | |
144 | const char *program; | |
145 | char * const *argv; | |
146 | const char *this_pname; | |
147 | const char *temp_base; | |
148 | char **errmsg_fmt, **errmsg_arg; | |
149 | int flags; | |
150 | { | |
151 | int rc; | |
152 | ||
153 | last_pid++; | |
154 | if (last_pid < 0) | |
155 | last_pid = 1; | |
156 | ||
157 | if ((flags & PEXECUTE_ONE) != PEXECUTE_ONE) | |
158 | abort (); | |
159 | ||
160 | #ifdef __GO32__ | |
161 | /* ??? What are the possible return values from spawnv? */ | |
162 | rc = (flags & PEXECUTE_SEARCH ? spawnvp : spawnv) (1, program, argv); | |
163 | #else | |
164 | char *scmd, *rf; | |
165 | FILE *argfile; | |
166 | int i, el = flags & PEXECUTE_SEARCH ? 4 : 0; | |
167 | ||
0c0a36a4 ILT |
168 | if (temp_base == 0) |
169 | temp_base = choose_temp_base (); | |
252b5132 RH |
170 | scmd = (char *) xmalloc (strlen (program) + strlen (temp_base) + 6 + el); |
171 | rf = scmd + strlen(program) + 2 + el; | |
172 | sprintf (scmd, "%s%s @%s.gp", program, | |
173 | (flags & PEXECUTE_SEARCH ? ".exe" : ""), temp_base); | |
174 | argfile = fopen (rf, "w"); | |
175 | if (argfile == 0) | |
176 | { | |
177 | int errno_save = errno; | |
178 | free (scmd); | |
179 | errno = errno_save; | |
180 | *errmsg_fmt = "cannot open `%s.gp'"; | |
181 | *errmsg_arg = temp_base; | |
182 | return -1; | |
183 | } | |
184 | ||
185 | for (i=1; argv[i]; i++) | |
186 | { | |
187 | char *cp; | |
188 | for (cp = argv[i]; *cp; cp++) | |
189 | { | |
190 | if (*cp == '"' || *cp == '\'' || *cp == '\\' || ISSPACE (*cp)) | |
191 | fputc ('\\', argfile); | |
192 | fputc (*cp, argfile); | |
193 | } | |
194 | fputc ('\n', argfile); | |
195 | } | |
196 | fclose (argfile); | |
197 | ||
198 | rc = system (scmd); | |
199 | ||
200 | { | |
201 | int errno_save = errno; | |
202 | remove (rf); | |
203 | free (scmd); | |
204 | errno = errno_save; | |
205 | } | |
206 | #endif | |
207 | ||
208 | if (rc == -1) | |
209 | { | |
210 | *errmsg_fmt = install_error_msg; | |
211 | *errmsg_arg = program; | |
212 | return -1; | |
213 | } | |
214 | ||
215 | /* Tuck the status away for pwait, and return a "pid". */ | |
216 | last_status = rc << 8; | |
217 | return last_pid; | |
218 | } | |
219 | ||
220 | int | |
221 | pwait (pid, status, flags) | |
222 | int pid; | |
223 | int *status; | |
224 | int flags; | |
225 | { | |
226 | /* On MSDOS each pexecute must be followed by it's associated pwait. */ | |
227 | if (pid != last_pid | |
228 | /* Called twice for the same child? */ | |
229 | || pid == last_reaped) | |
230 | { | |
231 | /* ??? ECHILD would be a better choice. Can we use it here? */ | |
232 | errno = EINVAL; | |
233 | return -1; | |
234 | } | |
235 | /* ??? Here's an opportunity to canonicalize the values in STATUS. | |
236 | Needed? */ | |
237 | *status = last_status; | |
238 | last_reaped = last_pid; | |
239 | return last_pid; | |
240 | } | |
241 | ||
242 | #endif /* MSDOS */ | |
243 | ||
0c0a36a4 | 244 | #if defined (_WIN32) && ! defined (_UWIN) |
252b5132 RH |
245 | |
246 | #include <process.h> | |
247 | ||
248 | #ifdef __CYGWIN__ | |
249 | ||
250 | #define fix_argv(argvec) (argvec) | |
251 | ||
252 | extern int _spawnv (); | |
253 | extern int _spawnvp (); | |
254 | ||
255 | #else /* ! __CYGWIN__ */ | |
256 | ||
257 | /* This is a kludge to get around the Microsoft C spawn functions' propensity | |
258 | to remove the outermost set of double quotes from all arguments. */ | |
259 | ||
260 | const char * const * | |
261 | fix_argv (argvec) | |
262 | char **argvec; | |
263 | { | |
264 | int i; | |
265 | ||
266 | for (i = 1; argvec[i] != 0; i++) | |
267 | { | |
268 | int len, j; | |
269 | char *temp, *newtemp; | |
270 | ||
271 | temp = argvec[i]; | |
272 | len = strlen (temp); | |
273 | for (j = 0; j < len; j++) | |
274 | { | |
275 | if (temp[j] == '"') | |
276 | { | |
277 | newtemp = xmalloc (len + 2); | |
278 | strncpy (newtemp, temp, j); | |
279 | newtemp [j] = '\\'; | |
280 | strncpy (&newtemp [j+1], &temp [j], len-j); | |
281 | newtemp [len+1] = 0; | |
282 | temp = newtemp; | |
283 | len++; | |
284 | j++; | |
285 | } | |
286 | } | |
287 | ||
288 | argvec[i] = temp; | |
289 | } | |
290 | ||
0c0a36a4 ILT |
291 | for (i = 0; argvec[i] != 0; i++) |
292 | { | |
293 | if (strpbrk (argvec[i], " \t")) | |
294 | { | |
295 | int len, trailing_backslash; | |
296 | char *temp; | |
297 | ||
298 | len = strlen (argvec[i]); | |
299 | trailing_backslash = 0; | |
300 | ||
301 | /* There is an added complication when an arg with embedded white | |
302 | space ends in a backslash (such as in the case of -iprefix arg | |
303 | passed to cpp). The resulting quoted strings gets misinterpreted | |
304 | by the command interpreter -- it thinks that the ending quote | |
305 | is escaped by the trailing backslash and things get confused. | |
306 | We handle this case by escaping the trailing backslash, provided | |
307 | it was not escaped in the first place. */ | |
308 | if (len > 1 | |
309 | && argvec[i][len-1] == '\\' | |
310 | && argvec[i][len-2] != '\\') | |
311 | { | |
312 | trailing_backslash = 1; | |
313 | ++len; /* to escape the final backslash. */ | |
314 | } | |
315 | ||
316 | len += 2; /* and for the enclosing quotes. */ | |
317 | ||
318 | temp = xmalloc (len + 1); | |
319 | temp[0] = '"'; | |
320 | strcpy (temp + 1, argvec[i]); | |
321 | if (trailing_backslash) | |
322 | temp[len-2] = '\\'; | |
323 | temp[len-1] = '"'; | |
324 | temp[len] = '\0'; | |
325 | ||
326 | argvec[i] = temp; | |
327 | } | |
328 | } | |
329 | ||
252b5132 RH |
330 | return (const char * const *) argvec; |
331 | } | |
332 | #endif /* __CYGWIN__ */ | |
333 | ||
334 | #include <io.h> | |
335 | #include <fcntl.h> | |
336 | #include <signal.h> | |
337 | ||
338 | /* mingw32 headers may not define the following. */ | |
339 | ||
340 | #ifndef _P_WAIT | |
341 | # define _P_WAIT 0 | |
342 | # define _P_NOWAIT 1 | |
343 | # define _P_OVERLAY 2 | |
344 | # define _P_NOWAITO 3 | |
345 | # define _P_DETACH 4 | |
346 | ||
347 | # define WAIT_CHILD 0 | |
348 | # define WAIT_GRANDCHILD 1 | |
349 | #endif | |
350 | ||
351 | /* Win32 supports pipes */ | |
352 | int | |
353 | pexecute (program, argv, this_pname, temp_base, errmsg_fmt, errmsg_arg, flags) | |
354 | const char *program; | |
355 | char * const *argv; | |
356 | const char *this_pname; | |
357 | const char *temp_base; | |
358 | char **errmsg_fmt, **errmsg_arg; | |
359 | int flags; | |
360 | { | |
361 | int pid; | |
362 | int pdes[2], org_stdin, org_stdout; | |
363 | int input_desc, output_desc; | |
364 | int retries, sleep_interval; | |
365 | ||
366 | /* Pipe waiting from last process, to be used as input for the next one. | |
367 | Value is STDIN_FILE_NO if no pipe is waiting | |
368 | (i.e. the next command is the first of a group). */ | |
369 | static int last_pipe_input; | |
370 | ||
371 | /* If this is the first process, initialize. */ | |
372 | if (flags & PEXECUTE_FIRST) | |
373 | last_pipe_input = STDIN_FILE_NO; | |
374 | ||
375 | input_desc = last_pipe_input; | |
376 | ||
377 | /* If this isn't the last process, make a pipe for its output, | |
378 | and record it as waiting to be the input to the next process. */ | |
379 | if (! (flags & PEXECUTE_LAST)) | |
380 | { | |
381 | if (_pipe (pdes, 256, O_BINARY) < 0) | |
382 | { | |
383 | *errmsg_fmt = "pipe"; | |
384 | *errmsg_arg = NULL; | |
385 | return -1; | |
386 | } | |
387 | output_desc = pdes[WRITE_PORT]; | |
388 | last_pipe_input = pdes[READ_PORT]; | |
389 | } | |
390 | else | |
391 | { | |
392 | /* Last process. */ | |
393 | output_desc = STDOUT_FILE_NO; | |
394 | last_pipe_input = STDIN_FILE_NO; | |
395 | } | |
396 | ||
397 | if (input_desc != STDIN_FILE_NO) | |
398 | { | |
399 | org_stdin = dup (STDIN_FILE_NO); | |
400 | dup2 (input_desc, STDIN_FILE_NO); | |
401 | close (input_desc); | |
402 | } | |
403 | ||
404 | if (output_desc != STDOUT_FILE_NO) | |
405 | { | |
406 | org_stdout = dup (STDOUT_FILE_NO); | |
407 | dup2 (output_desc, STDOUT_FILE_NO); | |
408 | close (output_desc); | |
409 | } | |
410 | ||
411 | pid = (flags & PEXECUTE_SEARCH ? _spawnvp : _spawnv) | |
412 | (_P_NOWAIT, program, fix_argv(argv)); | |
413 | ||
414 | if (input_desc != STDIN_FILE_NO) | |
415 | { | |
416 | dup2 (org_stdin, STDIN_FILE_NO); | |
417 | close (org_stdin); | |
418 | } | |
419 | ||
420 | if (output_desc != STDOUT_FILE_NO) | |
421 | { | |
422 | dup2 (org_stdout, STDOUT_FILE_NO); | |
423 | close (org_stdout); | |
424 | } | |
425 | ||
426 | if (pid == -1) | |
427 | { | |
428 | *errmsg_fmt = install_error_msg; | |
429 | *errmsg_arg = program; | |
430 | return -1; | |
431 | } | |
432 | ||
433 | return pid; | |
434 | } | |
435 | ||
436 | /* MS CRTDLL doesn't return enough information in status to decide if the | |
437 | child exited due to a signal or not, rather it simply returns an | |
438 | integer with the exit code of the child; eg., if the child exited with | |
439 | an abort() call and didn't have a handler for SIGABRT, it simply returns | |
440 | with status = 3. We fix the status code to conform to the usual WIF* | |
441 | macros. Note that WIFSIGNALED will never be true under CRTDLL. */ | |
442 | ||
443 | int | |
444 | pwait (pid, status, flags) | |
445 | int pid; | |
446 | int *status; | |
447 | int flags; | |
448 | { | |
449 | #ifdef __CYGWIN__ | |
450 | return wait (status); | |
451 | #else | |
452 | int termstat; | |
453 | ||
454 | pid = _cwait (&termstat, pid, WAIT_CHILD); | |
455 | ||
456 | /* ??? Here's an opportunity to canonicalize the values in STATUS. | |
457 | Needed? */ | |
458 | ||
459 | /* cwait returns the child process exit code in termstat. | |
460 | A value of 3 indicates that the child caught a signal, but not | |
461 | which one. Since only SIGABRT, SIGFPE and SIGINT do anything, we | |
462 | report SIGABRT. */ | |
463 | if (termstat == 3) | |
464 | *status = SIGABRT; | |
465 | else | |
466 | *status = (((termstat) & 0xff) << 8); | |
467 | ||
468 | return pid; | |
469 | #endif /* __CYGWIN__ */ | |
470 | } | |
471 | ||
0c0a36a4 | 472 | #endif /* _WIN32 && ! _UWIN */ |
252b5132 RH |
473 | |
474 | #ifdef OS2 | |
475 | ||
476 | /* ??? Does OS2 have process.h? */ | |
477 | extern int spawnv (); | |
478 | extern int spawnvp (); | |
479 | ||
480 | int | |
481 | pexecute (program, argv, this_pname, temp_base, errmsg_fmt, errmsg_arg, flags) | |
482 | const char *program; | |
483 | char * const *argv; | |
484 | const char *this_pname; | |
485 | const char *temp_base; | |
486 | char **errmsg_fmt, **errmsg_arg; | |
487 | int flags; | |
488 | { | |
489 | int pid; | |
490 | ||
491 | if ((flags & PEXECUTE_ONE) != PEXECUTE_ONE) | |
492 | abort (); | |
493 | /* ??? Presumably 1 == _P_NOWAIT. */ | |
494 | pid = (flags & PEXECUTE_SEARCH ? spawnvp : spawnv) (1, program, argv); | |
495 | if (pid == -1) | |
496 | { | |
497 | *errmsg_fmt = install_error_msg; | |
498 | *errmsg_arg = program; | |
499 | return -1; | |
500 | } | |
501 | return pid; | |
502 | } | |
503 | ||
504 | int | |
505 | pwait (pid, status, flags) | |
506 | int pid; | |
507 | int *status; | |
508 | int flags; | |
509 | { | |
510 | /* ??? Here's an opportunity to canonicalize the values in STATUS. | |
511 | Needed? */ | |
512 | int pid = wait (status); | |
513 | return pid; | |
514 | } | |
515 | ||
516 | #endif /* OS2 */ | |
517 | ||
518 | #ifdef MPW | |
519 | ||
520 | /* MPW pexecute doesn't actually run anything; instead, it writes out | |
521 | script commands that, when run, will do the actual executing. | |
522 | ||
523 | For example, in GCC's case, GCC will write out several script commands: | |
524 | ||
525 | cpp ... | |
526 | cc1 ... | |
527 | as ... | |
528 | ld ... | |
529 | ||
530 | and then exit. None of the above programs will have run yet. The task | |
531 | that called GCC will then execute the script and cause cpp,etc. to run. | |
532 | The caller must invoke pfinish before calling exit. This adds | |
533 | the finishing touches to the generated script. */ | |
534 | ||
535 | static int first_time = 1; | |
536 | ||
537 | int | |
538 | pexecute (program, argv, this_pname, temp_base, errmsg_fmt, errmsg_arg, flags) | |
539 | const char *program; | |
540 | char * const *argv; | |
541 | const char *this_pname; | |
542 | const char *temp_base; | |
543 | char **errmsg_fmt, **errmsg_arg; | |
544 | int flags; | |
545 | { | |
546 | char tmpprogram[255]; | |
547 | char *cp, *tmpname; | |
548 | int i; | |
549 | ||
550 | mpwify_filename (program, tmpprogram); | |
551 | if (first_time) | |
552 | { | |
553 | printf ("Set Failed 0\n"); | |
554 | first_time = 0; | |
555 | } | |
556 | ||
557 | fputs ("If {Failed} == 0\n", stdout); | |
558 | /* If being verbose, output a copy of the command. It should be | |
559 | accurate enough and escaped enough to be "clickable". */ | |
560 | if (flags & PEXECUTE_VERBOSE) | |
561 | { | |
562 | fputs ("\tEcho ", stdout); | |
563 | fputc ('\'', stdout); | |
564 | fputs (tmpprogram, stdout); | |
565 | fputc ('\'', stdout); | |
566 | fputc (' ', stdout); | |
567 | for (i=1; argv[i]; i++) | |
568 | { | |
569 | fputc ('\'', stdout); | |
570 | /* See if we have an argument that needs fixing. */ | |
571 | if (strchr(argv[i], '/')) | |
572 | { | |
573 | tmpname = (char *) xmalloc (256); | |
574 | mpwify_filename (argv[i], tmpname); | |
575 | argv[i] = tmpname; | |
576 | } | |
577 | for (cp = argv[i]; *cp; cp++) | |
578 | { | |
579 | /* Write an Option-d escape char in front of special chars. */ | |
580 | if (strchr("'+", *cp)) | |
581 | fputc ('\266', stdout); | |
582 | fputc (*cp, stdout); | |
583 | } | |
584 | fputc ('\'', stdout); | |
585 | fputc (' ', stdout); | |
586 | } | |
587 | fputs ("\n", stdout); | |
588 | } | |
589 | fputs ("\t", stdout); | |
590 | fputs (tmpprogram, stdout); | |
591 | fputc (' ', stdout); | |
592 | ||
593 | for (i=1; argv[i]; i++) | |
594 | { | |
595 | /* See if we have an argument that needs fixing. */ | |
596 | if (strchr(argv[i], '/')) | |
597 | { | |
598 | tmpname = (char *) xmalloc (256); | |
599 | mpwify_filename (argv[i], tmpname); | |
600 | argv[i] = tmpname; | |
601 | } | |
602 | if (strchr (argv[i], ' ')) | |
603 | fputc ('\'', stdout); | |
604 | for (cp = argv[i]; *cp; cp++) | |
605 | { | |
606 | /* Write an Option-d escape char in front of special chars. */ | |
607 | if (strchr("'+", *cp)) | |
608 | fputc ('\266', stdout); | |
609 | fputc (*cp, stdout); | |
610 | } | |
611 | if (strchr (argv[i], ' ')) | |
612 | fputc ('\'', stdout); | |
613 | fputc (' ', stdout); | |
614 | } | |
615 | ||
616 | fputs ("\n", stdout); | |
617 | ||
618 | /* Output commands that arrange to clean up and exit if a failure occurs. | |
619 | We have to be careful to collect the status from the program that was | |
620 | run, rather than some other script command. Also, we don't exit | |
621 | immediately, since necessary cleanups are at the end of the script. */ | |
622 | fputs ("\tSet TmpStatus {Status}\n", stdout); | |
623 | fputs ("\tIf {TmpStatus} != 0\n", stdout); | |
624 | fputs ("\t\tSet Failed {TmpStatus}\n", stdout); | |
625 | fputs ("\tEnd\n", stdout); | |
626 | fputs ("End\n", stdout); | |
627 | ||
628 | /* We're just composing a script, can't fail here. */ | |
629 | return 0; | |
630 | } | |
631 | ||
632 | int | |
633 | pwait (pid, status, flags) | |
634 | int pid; | |
635 | int *status; | |
636 | int flags; | |
637 | { | |
638 | *status = 0; | |
639 | return 0; | |
640 | } | |
641 | ||
642 | /* Write out commands that will exit with the correct error code | |
643 | if something in the script failed. */ | |
644 | ||
645 | void | |
646 | pfinish () | |
647 | { | |
648 | printf ("\tExit \"{Failed}\"\n"); | |
649 | } | |
650 | ||
651 | #endif /* MPW */ | |
652 | ||
653 | /* include for Unix-like environments but not for Dos-like environments */ | |
654 | #if ! defined (__MSDOS__) && ! defined (OS2) && ! defined (MPW) \ | |
0c0a36a4 | 655 | && ! (defined (_WIN32) && ! defined (_UWIN)) |
252b5132 RH |
656 | |
657 | extern int execv (); | |
658 | extern int execvp (); | |
659 | ||
660 | int | |
661 | pexecute (program, argv, this_pname, temp_base, errmsg_fmt, errmsg_arg, flags) | |
662 | const char *program; | |
663 | char * const *argv; | |
664 | const char *this_pname; | |
08372f14 | 665 | const char *temp_base ATTRIBUTE_UNUSED; |
252b5132 RH |
666 | char **errmsg_fmt, **errmsg_arg; |
667 | int flags; | |
668 | { | |
669 | int (*func)() = (flags & PEXECUTE_SEARCH ? execvp : execv); | |
670 | int pid; | |
671 | int pdes[2]; | |
672 | int input_desc, output_desc; | |
673 | int retries, sleep_interval; | |
674 | /* Pipe waiting from last process, to be used as input for the next one. | |
675 | Value is STDIN_FILE_NO if no pipe is waiting | |
676 | (i.e. the next command is the first of a group). */ | |
677 | static int last_pipe_input; | |
678 | ||
679 | /* If this is the first process, initialize. */ | |
680 | if (flags & PEXECUTE_FIRST) | |
681 | last_pipe_input = STDIN_FILE_NO; | |
682 | ||
683 | input_desc = last_pipe_input; | |
684 | ||
685 | /* If this isn't the last process, make a pipe for its output, | |
686 | and record it as waiting to be the input to the next process. */ | |
687 | if (! (flags & PEXECUTE_LAST)) | |
688 | { | |
689 | if (pipe (pdes) < 0) | |
690 | { | |
691 | *errmsg_fmt = "pipe"; | |
692 | *errmsg_arg = NULL; | |
693 | return -1; | |
694 | } | |
695 | output_desc = pdes[WRITE_PORT]; | |
696 | last_pipe_input = pdes[READ_PORT]; | |
697 | } | |
698 | else | |
699 | { | |
700 | /* Last process. */ | |
701 | output_desc = STDOUT_FILE_NO; | |
702 | last_pipe_input = STDIN_FILE_NO; | |
703 | } | |
704 | ||
705 | /* Fork a subprocess; wait and retry if it fails. */ | |
706 | sleep_interval = 1; | |
707 | for (retries = 0; retries < 4; retries++) | |
708 | { | |
709 | pid = vfork (); | |
710 | if (pid >= 0) | |
711 | break; | |
712 | sleep (sleep_interval); | |
713 | sleep_interval *= 2; | |
714 | } | |
715 | ||
716 | switch (pid) | |
717 | { | |
718 | case -1: | |
719 | { | |
720 | *errmsg_fmt = VFORK_STRING; | |
721 | *errmsg_arg = NULL; | |
722 | return -1; | |
723 | } | |
724 | ||
725 | case 0: /* child */ | |
726 | /* Move the input and output pipes into place, if necessary. */ | |
727 | if (input_desc != STDIN_FILE_NO) | |
728 | { | |
729 | close (STDIN_FILE_NO); | |
730 | dup (input_desc); | |
731 | close (input_desc); | |
732 | } | |
733 | if (output_desc != STDOUT_FILE_NO) | |
734 | { | |
735 | close (STDOUT_FILE_NO); | |
736 | dup (output_desc); | |
737 | close (output_desc); | |
738 | } | |
739 | ||
740 | /* Close the parent's descs that aren't wanted here. */ | |
741 | if (last_pipe_input != STDIN_FILE_NO) | |
742 | close (last_pipe_input); | |
743 | ||
744 | /* Exec the program. */ | |
745 | (*func) (program, argv); | |
746 | ||
747 | /* Note: Calling fprintf and exit here doesn't seem right for vfork. */ | |
748 | fprintf (stderr, "%s: ", this_pname); | |
749 | fprintf (stderr, install_error_msg, program); | |
750 | fprintf (stderr, ": %s\n", xstrerror (errno)); | |
751 | exit (-1); | |
752 | /* NOTREACHED */ | |
753 | return 0; | |
754 | ||
755 | default: | |
756 | /* In the parent, after forking. | |
757 | Close the descriptors that we made for this child. */ | |
758 | if (input_desc != STDIN_FILE_NO) | |
759 | close (input_desc); | |
760 | if (output_desc != STDOUT_FILE_NO) | |
761 | close (output_desc); | |
762 | ||
763 | /* Return child's process number. */ | |
764 | return pid; | |
765 | } | |
766 | } | |
767 | ||
768 | int | |
769 | pwait (pid, status, flags) | |
770 | int pid; | |
771 | int *status; | |
08372f14 | 772 | int flags ATTRIBUTE_UNUSED; |
252b5132 RH |
773 | { |
774 | /* ??? Here's an opportunity to canonicalize the values in STATUS. | |
775 | Needed? */ | |
776 | #ifdef VMS | |
777 | pid = waitpid (-1, status, 0); | |
778 | #else | |
779 | pid = wait (status); | |
780 | #endif | |
781 | return pid; | |
782 | } | |
783 | ||
0c0a36a4 | 784 | #endif /* ! __MSDOS__ && ! OS2 && ! MPW && ! (_WIN32 && ! _UWIN) */ |