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 | #ifdef HAVE_SYS_WAIT_H |
45 | #include <sys/wait.h> | |
46 | #endif | |
47 | ||
252b5132 | 48 | #include "libiberty.h" |
ac424eb3 | 49 | #include "safe-ctype.h" |
252b5132 | 50 | |
252b5132 RH |
51 | /* stdin file number. */ |
52 | #define STDIN_FILE_NO 0 | |
53 | ||
54 | /* stdout file number. */ | |
55 | #define STDOUT_FILE_NO 1 | |
56 | ||
57 | /* value of `pipe': port index for reading. */ | |
58 | #define READ_PORT 0 | |
59 | ||
60 | /* value of `pipe': port index for writing. */ | |
61 | #define WRITE_PORT 1 | |
62 | ||
63 | static char *install_error_msg = "installation problem, cannot exec `%s'"; | |
64 | ||
65 | /* pexecute: execute a program. | |
66 | ||
67 | PROGRAM and ARGV are the arguments to execv/execvp. | |
68 | ||
69 | THIS_PNAME is name of the calling program (i.e. argv[0]). | |
70 | ||
71 | TEMP_BASE is the path name, sans suffix, of a temporary file to use | |
72 | if needed. This is currently only needed for MSDOS ports that don't use | |
73 | GO32 (do any still exist?). Ports that don't need it can pass NULL. | |
74 | ||
75 | (FLAGS & PEXECUTE_SEARCH) is non-zero if $PATH should be searched | |
76 | (??? It's not clear that GCC passes this flag correctly). | |
77 | (FLAGS & PEXECUTE_FIRST) is nonzero for the first process in chain. | |
78 | (FLAGS & PEXECUTE_FIRST) is nonzero for the last process in chain. | |
79 | FIRST_LAST could be simplified to only mark the last of a chain of processes | |
80 | but that requires the caller to always mark the last one (and not give up | |
81 | early if some error occurs). It's more robust to require the caller to | |
82 | mark both ends of the chain. | |
83 | ||
84 | The result is the pid on systems like Unix where we fork/exec and on systems | |
85 | like WIN32 and OS2 where we use spawn. It is up to the caller to wait for | |
86 | the child. | |
87 | ||
88 | The result is the WEXITSTATUS on systems like MSDOS where we spawn and wait | |
89 | for the child here. | |
90 | ||
91 | Upon failure, ERRMSG_FMT and ERRMSG_ARG are set to the text of the error | |
92 | message with an optional argument (if not needed, ERRMSG_ARG is set to | |
93 | NULL), and -1 is returned. `errno' is available to the caller to use. | |
94 | ||
95 | pwait: cover function for wait. | |
96 | ||
97 | PID is the process id of the task to wait for. | |
98 | STATUS is the `status' argument to wait. | |
99 | FLAGS is currently unused (allows future enhancement without breaking | |
100 | upward compatibility). Pass 0 for now. | |
101 | ||
102 | The result is the pid of the child reaped, | |
103 | or -1 for failure (errno says why). | |
104 | ||
105 | On systems that don't support waiting for a particular child, PID is | |
106 | ignored. On systems like MSDOS that don't really multitask pwait | |
107 | is just a mechanism to provide a consistent interface for the caller. | |
108 | ||
109 | pfinish: finish generation of script | |
110 | ||
111 | pfinish is necessary for systems like MPW where a script is generated that | |
112 | runs the requested programs. | |
113 | */ | |
114 | ||
115 | #ifdef __MSDOS__ | |
116 | ||
117 | /* MSDOS doesn't multitask, but for the sake of a consistent interface | |
118 | the code behaves like it does. pexecute runs the program, tucks the | |
119 | exit code away, and returns a "pid". pwait must be called to fetch the | |
120 | exit code. */ | |
121 | ||
122 | #include <process.h> | |
123 | ||
124 | /* For communicating information from pexecute to pwait. */ | |
125 | static int last_pid = 0; | |
126 | static int last_status = 0; | |
127 | static int last_reaped = 0; | |
128 | ||
129 | int | |
130 | pexecute (program, argv, this_pname, temp_base, errmsg_fmt, errmsg_arg, flags) | |
131 | const char *program; | |
132 | char * const *argv; | |
133 | const char *this_pname; | |
134 | const char *temp_base; | |
135 | char **errmsg_fmt, **errmsg_arg; | |
136 | int flags; | |
137 | { | |
138 | int rc; | |
139 | ||
140 | last_pid++; | |
141 | if (last_pid < 0) | |
142 | last_pid = 1; | |
143 | ||
144 | if ((flags & PEXECUTE_ONE) != PEXECUTE_ONE) | |
145 | abort (); | |
146 | ||
a9f34fb6 | 147 | #ifdef __DJGPP__ |
252b5132 | 148 | /* ??? What are the possible return values from spawnv? */ |
a9f34fb6 | 149 | rc = (flags & PEXECUTE_SEARCH ? spawnvp : spawnv) (P_WAIT, program, argv); |
252b5132 RH |
150 | #else |
151 | char *scmd, *rf; | |
152 | FILE *argfile; | |
153 | int i, el = flags & PEXECUTE_SEARCH ? 4 : 0; | |
154 | ||
0c0a36a4 ILT |
155 | if (temp_base == 0) |
156 | temp_base = choose_temp_base (); | |
252b5132 RH |
157 | scmd = (char *) xmalloc (strlen (program) + strlen (temp_base) + 6 + el); |
158 | rf = scmd + strlen(program) + 2 + el; | |
159 | sprintf (scmd, "%s%s @%s.gp", program, | |
160 | (flags & PEXECUTE_SEARCH ? ".exe" : ""), temp_base); | |
161 | argfile = fopen (rf, "w"); | |
162 | if (argfile == 0) | |
163 | { | |
164 | int errno_save = errno; | |
165 | free (scmd); | |
166 | errno = errno_save; | |
167 | *errmsg_fmt = "cannot open `%s.gp'"; | |
168 | *errmsg_arg = temp_base; | |
169 | return -1; | |
170 | } | |
171 | ||
172 | for (i=1; argv[i]; i++) | |
173 | { | |
174 | char *cp; | |
175 | for (cp = argv[i]; *cp; cp++) | |
176 | { | |
177 | if (*cp == '"' || *cp == '\'' || *cp == '\\' || ISSPACE (*cp)) | |
178 | fputc ('\\', argfile); | |
179 | fputc (*cp, argfile); | |
180 | } | |
181 | fputc ('\n', argfile); | |
182 | } | |
183 | fclose (argfile); | |
184 | ||
185 | rc = system (scmd); | |
186 | ||
187 | { | |
188 | int errno_save = errno; | |
189 | remove (rf); | |
190 | free (scmd); | |
191 | errno = errno_save; | |
192 | } | |
193 | #endif | |
194 | ||
195 | if (rc == -1) | |
196 | { | |
197 | *errmsg_fmt = install_error_msg; | |
a9f34fb6 | 198 | *errmsg_arg = (char *)program; |
252b5132 RH |
199 | return -1; |
200 | } | |
201 | ||
202 | /* Tuck the status away for pwait, and return a "pid". */ | |
203 | last_status = rc << 8; | |
204 | return last_pid; | |
205 | } | |
206 | ||
a9f34fb6 JL |
207 | /* Use ECHILD if available, otherwise use EINVAL. */ |
208 | #ifdef ECHILD | |
209 | #define PWAIT_ERROR ECHILD | |
210 | #else | |
211 | #define PWAIT_ERROR EINVAL | |
212 | #endif | |
213 | ||
252b5132 RH |
214 | int |
215 | pwait (pid, status, flags) | |
216 | int pid; | |
217 | int *status; | |
218 | int flags; | |
219 | { | |
220 | /* On MSDOS each pexecute must be followed by it's associated pwait. */ | |
221 | if (pid != last_pid | |
222 | /* Called twice for the same child? */ | |
223 | || pid == last_reaped) | |
224 | { | |
a9f34fb6 | 225 | errno = PWAIT_ERROR; |
252b5132 RH |
226 | return -1; |
227 | } | |
228 | /* ??? Here's an opportunity to canonicalize the values in STATUS. | |
229 | Needed? */ | |
a9f34fb6 JL |
230 | #ifdef __DJGPP__ |
231 | *status = (last_status >> 8); | |
232 | #else | |
252b5132 | 233 | *status = last_status; |
a9f34fb6 | 234 | #endif |
252b5132 RH |
235 | last_reaped = last_pid; |
236 | return last_pid; | |
237 | } | |
238 | ||
239 | #endif /* MSDOS */ | |
240 | ||
0c0a36a4 | 241 | #if defined (_WIN32) && ! defined (_UWIN) |
252b5132 RH |
242 | |
243 | #include <process.h> | |
244 | ||
245 | #ifdef __CYGWIN__ | |
246 | ||
247 | #define fix_argv(argvec) (argvec) | |
248 | ||
249 | extern int _spawnv (); | |
250 | extern int _spawnvp (); | |
251 | ||
252 | #else /* ! __CYGWIN__ */ | |
253 | ||
254 | /* This is a kludge to get around the Microsoft C spawn functions' propensity | |
255 | to remove the outermost set of double quotes from all arguments. */ | |
256 | ||
257 | const char * const * | |
258 | fix_argv (argvec) | |
259 | char **argvec; | |
260 | { | |
261 | int i; | |
262 | ||
263 | for (i = 1; argvec[i] != 0; i++) | |
264 | { | |
265 | int len, j; | |
266 | char *temp, *newtemp; | |
267 | ||
268 | temp = argvec[i]; | |
269 | len = strlen (temp); | |
270 | for (j = 0; j < len; j++) | |
271 | { | |
272 | if (temp[j] == '"') | |
273 | { | |
274 | newtemp = xmalloc (len + 2); | |
275 | strncpy (newtemp, temp, j); | |
276 | newtemp [j] = '\\'; | |
277 | strncpy (&newtemp [j+1], &temp [j], len-j); | |
278 | newtemp [len+1] = 0; | |
279 | temp = newtemp; | |
280 | len++; | |
281 | j++; | |
282 | } | |
283 | } | |
284 | ||
285 | argvec[i] = temp; | |
286 | } | |
287 | ||
0c0a36a4 ILT |
288 | for (i = 0; argvec[i] != 0; i++) |
289 | { | |
290 | if (strpbrk (argvec[i], " \t")) | |
291 | { | |
292 | int len, trailing_backslash; | |
293 | char *temp; | |
294 | ||
295 | len = strlen (argvec[i]); | |
296 | trailing_backslash = 0; | |
297 | ||
298 | /* There is an added complication when an arg with embedded white | |
299 | space ends in a backslash (such as in the case of -iprefix arg | |
300 | passed to cpp). The resulting quoted strings gets misinterpreted | |
301 | by the command interpreter -- it thinks that the ending quote | |
302 | is escaped by the trailing backslash and things get confused. | |
303 | We handle this case by escaping the trailing backslash, provided | |
304 | it was not escaped in the first place. */ | |
305 | if (len > 1 | |
306 | && argvec[i][len-1] == '\\' | |
307 | && argvec[i][len-2] != '\\') | |
308 | { | |
309 | trailing_backslash = 1; | |
310 | ++len; /* to escape the final backslash. */ | |
311 | } | |
312 | ||
313 | len += 2; /* and for the enclosing quotes. */ | |
314 | ||
315 | temp = xmalloc (len + 1); | |
316 | temp[0] = '"'; | |
317 | strcpy (temp + 1, argvec[i]); | |
318 | if (trailing_backslash) | |
319 | temp[len-2] = '\\'; | |
320 | temp[len-1] = '"'; | |
321 | temp[len] = '\0'; | |
322 | ||
323 | argvec[i] = temp; | |
324 | } | |
325 | } | |
326 | ||
252b5132 RH |
327 | return (const char * const *) argvec; |
328 | } | |
329 | #endif /* __CYGWIN__ */ | |
330 | ||
331 | #include <io.h> | |
332 | #include <fcntl.h> | |
333 | #include <signal.h> | |
334 | ||
335 | /* mingw32 headers may not define the following. */ | |
336 | ||
337 | #ifndef _P_WAIT | |
338 | # define _P_WAIT 0 | |
339 | # define _P_NOWAIT 1 | |
340 | # define _P_OVERLAY 2 | |
341 | # define _P_NOWAITO 3 | |
342 | # define _P_DETACH 4 | |
343 | ||
344 | # define WAIT_CHILD 0 | |
345 | # define WAIT_GRANDCHILD 1 | |
346 | #endif | |
347 | ||
348 | /* Win32 supports pipes */ | |
349 | int | |
350 | pexecute (program, argv, this_pname, temp_base, errmsg_fmt, errmsg_arg, flags) | |
351 | const char *program; | |
352 | char * const *argv; | |
353 | const char *this_pname; | |
354 | const char *temp_base; | |
355 | char **errmsg_fmt, **errmsg_arg; | |
356 | int flags; | |
357 | { | |
358 | int pid; | |
359 | int pdes[2], org_stdin, org_stdout; | |
360 | int input_desc, output_desc; | |
361 | int retries, sleep_interval; | |
362 | ||
363 | /* Pipe waiting from last process, to be used as input for the next one. | |
364 | Value is STDIN_FILE_NO if no pipe is waiting | |
365 | (i.e. the next command is the first of a group). */ | |
366 | static int last_pipe_input; | |
367 | ||
368 | /* If this is the first process, initialize. */ | |
369 | if (flags & PEXECUTE_FIRST) | |
370 | last_pipe_input = STDIN_FILE_NO; | |
371 | ||
372 | input_desc = last_pipe_input; | |
373 | ||
374 | /* If this isn't the last process, make a pipe for its output, | |
375 | and record it as waiting to be the input to the next process. */ | |
376 | if (! (flags & PEXECUTE_LAST)) | |
377 | { | |
378 | if (_pipe (pdes, 256, O_BINARY) < 0) | |
379 | { | |
380 | *errmsg_fmt = "pipe"; | |
381 | *errmsg_arg = NULL; | |
382 | return -1; | |
383 | } | |
384 | output_desc = pdes[WRITE_PORT]; | |
385 | last_pipe_input = pdes[READ_PORT]; | |
386 | } | |
387 | else | |
388 | { | |
389 | /* Last process. */ | |
390 | output_desc = STDOUT_FILE_NO; | |
391 | last_pipe_input = STDIN_FILE_NO; | |
392 | } | |
393 | ||
394 | if (input_desc != STDIN_FILE_NO) | |
395 | { | |
396 | org_stdin = dup (STDIN_FILE_NO); | |
397 | dup2 (input_desc, STDIN_FILE_NO); | |
398 | close (input_desc); | |
399 | } | |
400 | ||
401 | if (output_desc != STDOUT_FILE_NO) | |
402 | { | |
403 | org_stdout = dup (STDOUT_FILE_NO); | |
404 | dup2 (output_desc, STDOUT_FILE_NO); | |
405 | close (output_desc); | |
406 | } | |
407 | ||
408 | pid = (flags & PEXECUTE_SEARCH ? _spawnvp : _spawnv) | |
409 | (_P_NOWAIT, program, fix_argv(argv)); | |
410 | ||
411 | if (input_desc != STDIN_FILE_NO) | |
412 | { | |
413 | dup2 (org_stdin, STDIN_FILE_NO); | |
414 | close (org_stdin); | |
415 | } | |
416 | ||
417 | if (output_desc != STDOUT_FILE_NO) | |
418 | { | |
419 | dup2 (org_stdout, STDOUT_FILE_NO); | |
420 | close (org_stdout); | |
421 | } | |
422 | ||
423 | if (pid == -1) | |
424 | { | |
425 | *errmsg_fmt = install_error_msg; | |
426 | *errmsg_arg = program; | |
427 | return -1; | |
428 | } | |
429 | ||
430 | return pid; | |
431 | } | |
432 | ||
433 | /* MS CRTDLL doesn't return enough information in status to decide if the | |
434 | child exited due to a signal or not, rather it simply returns an | |
435 | integer with the exit code of the child; eg., if the child exited with | |
436 | an abort() call and didn't have a handler for SIGABRT, it simply returns | |
437 | with status = 3. We fix the status code to conform to the usual WIF* | |
438 | macros. Note that WIFSIGNALED will never be true under CRTDLL. */ | |
439 | ||
440 | int | |
441 | pwait (pid, status, flags) | |
442 | int pid; | |
443 | int *status; | |
444 | int flags; | |
445 | { | |
446 | #ifdef __CYGWIN__ | |
447 | return wait (status); | |
448 | #else | |
449 | int termstat; | |
450 | ||
451 | pid = _cwait (&termstat, pid, WAIT_CHILD); | |
452 | ||
453 | /* ??? Here's an opportunity to canonicalize the values in STATUS. | |
454 | Needed? */ | |
455 | ||
456 | /* cwait returns the child process exit code in termstat. | |
457 | A value of 3 indicates that the child caught a signal, but not | |
458 | which one. Since only SIGABRT, SIGFPE and SIGINT do anything, we | |
459 | report SIGABRT. */ | |
460 | if (termstat == 3) | |
461 | *status = SIGABRT; | |
462 | else | |
463 | *status = (((termstat) & 0xff) << 8); | |
464 | ||
465 | return pid; | |
466 | #endif /* __CYGWIN__ */ | |
467 | } | |
468 | ||
0c0a36a4 | 469 | #endif /* _WIN32 && ! _UWIN */ |
252b5132 RH |
470 | |
471 | #ifdef OS2 | |
472 | ||
473 | /* ??? Does OS2 have process.h? */ | |
474 | extern int spawnv (); | |
475 | extern int spawnvp (); | |
476 | ||
477 | int | |
478 | pexecute (program, argv, this_pname, temp_base, errmsg_fmt, errmsg_arg, flags) | |
479 | const char *program; | |
480 | char * const *argv; | |
481 | const char *this_pname; | |
482 | const char *temp_base; | |
483 | char **errmsg_fmt, **errmsg_arg; | |
484 | int flags; | |
485 | { | |
486 | int pid; | |
487 | ||
488 | if ((flags & PEXECUTE_ONE) != PEXECUTE_ONE) | |
489 | abort (); | |
490 | /* ??? Presumably 1 == _P_NOWAIT. */ | |
491 | pid = (flags & PEXECUTE_SEARCH ? spawnvp : spawnv) (1, program, argv); | |
492 | if (pid == -1) | |
493 | { | |
494 | *errmsg_fmt = install_error_msg; | |
495 | *errmsg_arg = program; | |
496 | return -1; | |
497 | } | |
498 | return pid; | |
499 | } | |
500 | ||
501 | int | |
502 | pwait (pid, status, flags) | |
503 | int pid; | |
504 | int *status; | |
505 | int flags; | |
506 | { | |
507 | /* ??? Here's an opportunity to canonicalize the values in STATUS. | |
508 | Needed? */ | |
509 | int pid = wait (status); | |
510 | return pid; | |
511 | } | |
512 | ||
513 | #endif /* OS2 */ | |
514 | ||
515 | #ifdef MPW | |
516 | ||
517 | /* MPW pexecute doesn't actually run anything; instead, it writes out | |
518 | script commands that, when run, will do the actual executing. | |
519 | ||
520 | For example, in GCC's case, GCC will write out several script commands: | |
521 | ||
522 | cpp ... | |
523 | cc1 ... | |
524 | as ... | |
525 | ld ... | |
526 | ||
527 | and then exit. None of the above programs will have run yet. The task | |
528 | that called GCC will then execute the script and cause cpp,etc. to run. | |
529 | The caller must invoke pfinish before calling exit. This adds | |
530 | the finishing touches to the generated script. */ | |
531 | ||
532 | static int first_time = 1; | |
533 | ||
534 | int | |
535 | pexecute (program, argv, this_pname, temp_base, errmsg_fmt, errmsg_arg, flags) | |
536 | const char *program; | |
537 | char * const *argv; | |
538 | const char *this_pname; | |
539 | const char *temp_base; | |
540 | char **errmsg_fmt, **errmsg_arg; | |
541 | int flags; | |
542 | { | |
543 | char tmpprogram[255]; | |
544 | char *cp, *tmpname; | |
545 | int i; | |
546 | ||
547 | mpwify_filename (program, tmpprogram); | |
548 | if (first_time) | |
549 | { | |
550 | printf ("Set Failed 0\n"); | |
551 | first_time = 0; | |
552 | } | |
553 | ||
554 | fputs ("If {Failed} == 0\n", stdout); | |
555 | /* If being verbose, output a copy of the command. It should be | |
556 | accurate enough and escaped enough to be "clickable". */ | |
557 | if (flags & PEXECUTE_VERBOSE) | |
558 | { | |
559 | fputs ("\tEcho ", stdout); | |
560 | fputc ('\'', stdout); | |
561 | fputs (tmpprogram, stdout); | |
562 | fputc ('\'', stdout); | |
563 | fputc (' ', stdout); | |
564 | for (i=1; argv[i]; i++) | |
565 | { | |
566 | fputc ('\'', stdout); | |
567 | /* See if we have an argument that needs fixing. */ | |
568 | if (strchr(argv[i], '/')) | |
569 | { | |
570 | tmpname = (char *) xmalloc (256); | |
571 | mpwify_filename (argv[i], tmpname); | |
572 | argv[i] = tmpname; | |
573 | } | |
574 | for (cp = argv[i]; *cp; cp++) | |
575 | { | |
576 | /* Write an Option-d escape char in front of special chars. */ | |
577 | if (strchr("'+", *cp)) | |
578 | fputc ('\266', stdout); | |
579 | fputc (*cp, stdout); | |
580 | } | |
581 | fputc ('\'', stdout); | |
582 | fputc (' ', stdout); | |
583 | } | |
584 | fputs ("\n", stdout); | |
585 | } | |
586 | fputs ("\t", stdout); | |
587 | fputs (tmpprogram, stdout); | |
588 | fputc (' ', stdout); | |
589 | ||
590 | for (i=1; argv[i]; i++) | |
591 | { | |
592 | /* See if we have an argument that needs fixing. */ | |
593 | if (strchr(argv[i], '/')) | |
594 | { | |
595 | tmpname = (char *) xmalloc (256); | |
596 | mpwify_filename (argv[i], tmpname); | |
597 | argv[i] = tmpname; | |
598 | } | |
599 | if (strchr (argv[i], ' ')) | |
600 | fputc ('\'', stdout); | |
601 | for (cp = argv[i]; *cp; cp++) | |
602 | { | |
603 | /* Write an Option-d escape char in front of special chars. */ | |
604 | if (strchr("'+", *cp)) | |
605 | fputc ('\266', stdout); | |
606 | fputc (*cp, stdout); | |
607 | } | |
608 | if (strchr (argv[i], ' ')) | |
609 | fputc ('\'', stdout); | |
610 | fputc (' ', stdout); | |
611 | } | |
612 | ||
613 | fputs ("\n", stdout); | |
614 | ||
615 | /* Output commands that arrange to clean up and exit if a failure occurs. | |
616 | We have to be careful to collect the status from the program that was | |
617 | run, rather than some other script command. Also, we don't exit | |
618 | immediately, since necessary cleanups are at the end of the script. */ | |
619 | fputs ("\tSet TmpStatus {Status}\n", stdout); | |
620 | fputs ("\tIf {TmpStatus} != 0\n", stdout); | |
621 | fputs ("\t\tSet Failed {TmpStatus}\n", stdout); | |
622 | fputs ("\tEnd\n", stdout); | |
623 | fputs ("End\n", stdout); | |
624 | ||
625 | /* We're just composing a script, can't fail here. */ | |
626 | return 0; | |
627 | } | |
628 | ||
629 | int | |
630 | pwait (pid, status, flags) | |
631 | int pid; | |
632 | int *status; | |
633 | int flags; | |
634 | { | |
635 | *status = 0; | |
636 | return 0; | |
637 | } | |
638 | ||
639 | /* Write out commands that will exit with the correct error code | |
640 | if something in the script failed. */ | |
641 | ||
642 | void | |
643 | pfinish () | |
644 | { | |
645 | printf ("\tExit \"{Failed}\"\n"); | |
646 | } | |
647 | ||
648 | #endif /* MPW */ | |
649 | ||
650 | /* include for Unix-like environments but not for Dos-like environments */ | |
651 | #if ! defined (__MSDOS__) && ! defined (OS2) && ! defined (MPW) \ | |
0c0a36a4 | 652 | && ! (defined (_WIN32) && ! defined (_UWIN)) |
252b5132 RH |
653 | |
654 | extern int execv (); | |
655 | extern int execvp (); | |
656 | ||
657 | int | |
658 | pexecute (program, argv, this_pname, temp_base, errmsg_fmt, errmsg_arg, flags) | |
659 | const char *program; | |
660 | char * const *argv; | |
661 | const char *this_pname; | |
08372f14 | 662 | const char *temp_base ATTRIBUTE_UNUSED; |
252b5132 RH |
663 | char **errmsg_fmt, **errmsg_arg; |
664 | int flags; | |
665 | { | |
666 | int (*func)() = (flags & PEXECUTE_SEARCH ? execvp : execv); | |
667 | int pid; | |
668 | int pdes[2]; | |
669 | int input_desc, output_desc; | |
670 | int retries, sleep_interval; | |
671 | /* Pipe waiting from last process, to be used as input for the next one. | |
672 | Value is STDIN_FILE_NO if no pipe is waiting | |
673 | (i.e. the next command is the first of a group). */ | |
674 | static int last_pipe_input; | |
675 | ||
676 | /* If this is the first process, initialize. */ | |
677 | if (flags & PEXECUTE_FIRST) | |
678 | last_pipe_input = STDIN_FILE_NO; | |
679 | ||
680 | input_desc = last_pipe_input; | |
681 | ||
682 | /* If this isn't the last process, make a pipe for its output, | |
683 | and record it as waiting to be the input to the next process. */ | |
684 | if (! (flags & PEXECUTE_LAST)) | |
685 | { | |
686 | if (pipe (pdes) < 0) | |
687 | { | |
688 | *errmsg_fmt = "pipe"; | |
689 | *errmsg_arg = NULL; | |
690 | return -1; | |
691 | } | |
692 | output_desc = pdes[WRITE_PORT]; | |
693 | last_pipe_input = pdes[READ_PORT]; | |
694 | } | |
695 | else | |
696 | { | |
697 | /* Last process. */ | |
698 | output_desc = STDOUT_FILE_NO; | |
699 | last_pipe_input = STDIN_FILE_NO; | |
700 | } | |
701 | ||
702 | /* Fork a subprocess; wait and retry if it fails. */ | |
703 | sleep_interval = 1; | |
74bcd529 | 704 | pid = -1; |
252b5132 RH |
705 | for (retries = 0; retries < 4; retries++) |
706 | { | |
74bcd529 | 707 | pid = fork (); |
252b5132 RH |
708 | if (pid >= 0) |
709 | break; | |
710 | sleep (sleep_interval); | |
711 | sleep_interval *= 2; | |
712 | } | |
713 | ||
714 | switch (pid) | |
715 | { | |
716 | case -1: | |
74bcd529 DD |
717 | *errmsg_fmt = "fork"; |
718 | *errmsg_arg = NULL; | |
719 | return -1; | |
252b5132 RH |
720 | |
721 | case 0: /* child */ | |
722 | /* Move the input and output pipes into place, if necessary. */ | |
723 | if (input_desc != STDIN_FILE_NO) | |
724 | { | |
725 | close (STDIN_FILE_NO); | |
726 | dup (input_desc); | |
727 | close (input_desc); | |
728 | } | |
729 | if (output_desc != STDOUT_FILE_NO) | |
730 | { | |
731 | close (STDOUT_FILE_NO); | |
732 | dup (output_desc); | |
733 | close (output_desc); | |
734 | } | |
735 | ||
736 | /* Close the parent's descs that aren't wanted here. */ | |
737 | if (last_pipe_input != STDIN_FILE_NO) | |
738 | close (last_pipe_input); | |
739 | ||
740 | /* Exec the program. */ | |
741 | (*func) (program, argv); | |
742 | ||
252b5132 RH |
743 | fprintf (stderr, "%s: ", this_pname); |
744 | fprintf (stderr, install_error_msg, program); | |
745 | fprintf (stderr, ": %s\n", xstrerror (errno)); | |
746 | exit (-1); | |
747 | /* NOTREACHED */ | |
748 | return 0; | |
749 | ||
750 | default: | |
751 | /* In the parent, after forking. | |
752 | Close the descriptors that we made for this child. */ | |
753 | if (input_desc != STDIN_FILE_NO) | |
754 | close (input_desc); | |
755 | if (output_desc != STDOUT_FILE_NO) | |
756 | close (output_desc); | |
757 | ||
758 | /* Return child's process number. */ | |
759 | return pid; | |
760 | } | |
761 | } | |
762 | ||
763 | int | |
764 | pwait (pid, status, flags) | |
765 | int pid; | |
766 | int *status; | |
08372f14 | 767 | int flags ATTRIBUTE_UNUSED; |
252b5132 RH |
768 | { |
769 | /* ??? Here's an opportunity to canonicalize the values in STATUS. | |
770 | Needed? */ | |
771 | #ifdef VMS | |
772 | pid = waitpid (-1, status, 0); | |
773 | #else | |
774 | pid = wait (status); | |
775 | #endif | |
776 | return pid; | |
777 | } | |
778 | ||
0c0a36a4 | 779 | #endif /* ! __MSDOS__ && ! OS2 && ! MPW && ! (_WIN32 && ! _UWIN) */ |