1 /* Common code for executing a program in a sub-process.
2 Copyright (C) 2005 Free Software Foundation, Inc.
3 Written by Ian Lance Taylor <ian@airs.com>.
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.
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.
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., 51 Franklin Street - Fifth Floor,
19 Boston, MA 02110-1301, USA. */
22 #include "libiberty.h"
23 #include "pex-common.h"
27 #ifdef NEED_DECLARATION_ERRNO
40 extern int mkstemps (char *, int);
42 /* This file contains subroutines for the program execution routines
43 (pex_init, pex_run, etc.). This file is compiled on all
46 static void pex_add_remove (struct pex_obj *, const char *, int);
47 static int pex_get_status_and_time (struct pex_obj *, int, const char **,
50 /* Initialize a pex_obj structure. */
53 pex_init_common (int flags, const char *pname, const char *tempbase,
54 const struct pex_funcs *funcs)
58 obj = XNEW (struct pex_obj);
61 obj->tempbase = tempbase;
62 obj->next_input = STDIN_FILE_NO;
63 obj->next_input_name = NULL;
64 obj->next_input_name_allocated = 0;
69 obj->number_waited = 0;
70 obj->read_output = NULL;
71 obj->remove_count = 0;
78 /* Add a file to be removed when we are done. */
81 pex_add_remove (struct pex_obj *obj, const char *name, int allocated)
86 obj->remove = XRESIZEVEC (char *, obj->remove, obj->remove_count);
91 obj->remove[obj->remove_count - 1] = add;
94 /* Generate a temporary file name based on OBJ, FLAGS, and NAME.
95 Return NULL if we were unable to reserve a temporary filename.
97 If non-NULL, the result is either allocated with malloc, or the
98 same pointer as NAME. */
100 temp_file (struct pex_obj *obj, int flags, char *name)
104 if (obj->tempbase == NULL)
106 name = make_temp_file (NULL);
110 int len = strlen (obj->tempbase);
114 && strcmp (obj->tempbase + len - 6, "XXXXXX") == 0)
115 name = xstrdup (obj->tempbase);
117 name = concat (obj->tempbase, "XXXXXX", NULL);
119 out = mkstemps (name, 0);
126 /* This isn't obj->funcs->close because we got the
127 descriptor from mkstemps, not from a function in
128 obj->funcs. Calling close here is just like what
129 make_temp_file does. */
133 else if ((flags & PEX_SUFFIX) != 0)
135 if (obj->tempbase == NULL)
136 name = make_temp_file (name);
138 name = concat (obj->tempbase, name, NULL);
147 pex_run (struct pex_obj *obj, int flags, const char *executable,
148 char * const * argv, const char *orig_outname, const char *errname,
154 int outname_allocated;
161 outname = (char *) orig_outname;
162 outname_allocated = 0;
166 if (obj->next_input_name != NULL)
168 /* We have to make sure that the previous process has completed
169 before we try to read the file. */
170 if (!pex_get_status_and_time (obj, 0, &errmsg, err))
173 in = obj->funcs->open_read (obj, obj->next_input_name,
174 (flags & PEX_BINARY_INPUT) != 0);
178 errmsg = "open temporary file";
181 if (obj->next_input_name_allocated)
183 free (obj->next_input_name);
184 obj->next_input_name_allocated = 0;
186 obj->next_input_name = NULL;
190 in = obj->next_input;
194 errmsg = "pipeline already complete";
199 /* Set OUT and OBJ->NEXT_INPUT/OBJ->NEXT_INPUT_NAME. */
201 if ((flags & PEX_LAST) != 0)
204 out = STDOUT_FILE_NO;
205 else if ((flags & PEX_SUFFIX) != 0)
207 outname = concat (obj->tempbase, outname, NULL);
208 outname_allocated = 1;
210 obj->next_input = -1;
212 else if ((obj->flags & PEX_USE_PIPES) == 0)
214 outname = temp_file (obj, flags, outname);
218 errmsg = "could not create temporary file";
222 if (outname != orig_outname)
223 outname_allocated = 1;
225 if ((obj->flags & PEX_SAVE_TEMPS) == 0)
227 pex_add_remove (obj, outname, outname_allocated);
228 outname_allocated = 0;
231 /* Hand off ownership of outname to the next stage. */
232 obj->next_input_name = outname;
233 obj->next_input_name_allocated = outname_allocated;
234 outname_allocated = 0;
238 if (obj->funcs->pipe (obj, p, (flags & PEX_BINARY_OUTPUT) != 0) < 0)
246 obj->next_input = p[READ_PORT];
251 out = obj->funcs->open_write (obj, outname,
252 (flags & PEX_BINARY_OUTPUT) != 0);
256 errmsg = "open temporary output file";
261 if (outname_allocated)
264 outname_allocated = 0;
270 errdes = STDERR_FILE_NO;
273 /* We assume that stderr is in text mode--it certainly shouldn't
274 be controlled by PEX_BINARY_OUTPUT. If necessary, we can add
275 a PEX_BINARY_STDERR flag. */
276 errdes = obj->funcs->open_write (obj, errname, 0);
280 errmsg = "open error file";
285 /* Run the program. */
287 pid = obj->funcs->exec_child (obj, flags, executable, argv, in, out, errdes,
293 obj->children = XRESIZEVEC (long, obj->children, obj->count);
294 obj->children[obj->count - 1] = pid;
299 if (in >= 0 && in != STDIN_FILE_NO)
300 obj->funcs->close (obj, in);
301 if (out >= 0 && out != STDOUT_FILE_NO)
302 obj->funcs->close (obj, out);
303 if (errdes >= 0 && errdes != STDERR_FILE_NO)
304 obj->funcs->close (obj, errdes);
305 if (outname_allocated)
310 /* Return a FILE pointer for the output of the last program
314 pex_read_output (struct pex_obj *obj, int binary)
316 if (obj->next_input_name != NULL)
321 /* We have to make sure that the process has completed before we
322 try to read the file. */
323 if (!pex_get_status_and_time (obj, 0, &errmsg, &err))
329 obj->read_output = fopen (obj->next_input_name, binary ? "rb" : "r");
331 if (obj->next_input_name_allocated)
333 free (obj->next_input_name);
334 obj->next_input_name_allocated = 0;
336 obj->next_input_name = NULL;
343 if (o < 0 || o == STDIN_FILE_NO)
345 obj->read_output = obj->funcs->fdopenr (obj, o, binary);
346 obj->next_input = -1;
349 return obj->read_output;
352 /* Get the exit status and, if requested, the resource time for all
353 the child processes. Return 0 on failure, 1 on success. */
356 pex_get_status_and_time (struct pex_obj *obj, int done, const char **errmsg,
362 if (obj->number_waited == obj->count)
365 obj->status = XRESIZEVEC (int, obj->status, obj->count);
366 if ((obj->flags & PEX_RECORD_TIMES) != 0)
367 obj->time = XRESIZEVEC (struct pex_time, obj->time, obj->count);
370 for (i = obj->number_waited; i < obj->count; ++i)
372 if (obj->funcs->wait (obj, obj->children[i], &obj->status[i],
373 obj->time == NULL ? NULL : &obj->time[i],
374 done, errmsg, err) < 0)
377 obj->number_waited = i;
382 /* Get exit status of executed programs. */
385 pex_get_status (struct pex_obj *obj, int count, int *vector)
387 if (obj->status == NULL)
392 if (!pex_get_status_and_time (obj, 0, &errmsg, &err))
396 if (count > obj->count)
398 memset (vector + obj->count, 0, (count - obj->count) * sizeof (int));
402 memcpy (vector, obj->status, count * sizeof (int));
407 /* Get process times of executed programs. */
410 pex_get_times (struct pex_obj *obj, int count, struct pex_time *vector)
412 if (obj->status == NULL)
417 if (!pex_get_status_and_time (obj, 0, &errmsg, &err))
421 if (obj->time == NULL)
424 if (count > obj->count)
426 memset (vector + obj->count, 0,
427 (count - obj->count) * sizeof (struct pex_time));
431 memcpy (vector, obj->time, count * sizeof (struct pex_time));
436 /* Free a pex_obj structure. */
439 pex_free (struct pex_obj *obj)
441 if (obj->next_input >= 0 && obj->next_input != STDIN_FILE_NO)
442 obj->funcs->close (obj, obj->next_input);
444 /* If the caller forgot to wait for the children, we do it here, to
446 if (obj->status == NULL)
451 obj->flags &= ~ PEX_RECORD_TIMES;
452 pex_get_status_and_time (obj, 1, &errmsg, &err);
455 if (obj->next_input_name_allocated)
456 free (obj->next_input_name);
457 if (obj->children != NULL)
458 free (obj->children);
459 if (obj->status != NULL)
461 if (obj->time != NULL)
463 if (obj->read_output != NULL)
464 fclose (obj->read_output);
466 if (obj->remove_count > 0)
470 for (i = 0; i < obj->remove_count; ++i)
472 remove (obj->remove[i]);
473 free (obj->remove[i]);
478 if (obj->funcs->cleanup != NULL)
479 obj->funcs->cleanup (obj);