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[chaz/tar] / src / system.c
1 /* System-dependent calls for tar.
2
3 Copyright 2003-2008, 2010, 2013-2014 Free Software Foundation, Inc.
4
5 This program is free software; you can redistribute it and/or modify it
6 under the terms of the GNU General Public License as published by the
7 Free Software Foundation; either version 3, or (at your option) any later
8 version.
9
10 This program is distributed in the hope that it will be useful, but
11 WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
13 Public License for more details.
14
15 You should have received a copy of the GNU General Public License along
16 with this program. If not, see <http://www.gnu.org/licenses/>. */
17
18 #include <system.h>
19
20 #include "common.h"
21 #include <priv-set.h>
22 #include <rmt.h>
23 #include <signal.h>
24 #include <wordsplit.h>
25
26 static _Noreturn void
27 xexec (const char *cmd)
28 {
29 struct wordsplit ws;
30
31 ws.ws_env = (const char **) environ;
32 if (wordsplit (cmd, &ws, (WRDSF_DEFFLAGS | WRDSF_ENV) & ~WRDSF_NOVAR))
33 FATAL_ERROR ((0, 0, _("cannot split string '%s': %s"),
34 cmd, wordsplit_strerror (&ws)));
35 execvp (ws.ws_wordv[0], ws.ws_wordv);
36 exec_fatal (cmd);
37 }
38
39 #if MSDOS
40
41 bool
42 sys_get_archive_stat (void)
43 {
44 return 0;
45 }
46
47 bool
48 sys_file_is_archive (struct tar_stat_info *p)
49 {
50 return false;
51 }
52
53 void
54 sys_save_archive_dev_ino (void)
55 {
56 }
57
58 void
59 sys_detect_dev_null_output (void)
60 {
61 static char const dev_null[] = "nul";
62
63 dev_null_output = (strcmp (archive_name_array[0], dev_null) == 0
64 || (! _isrmt (archive)));
65 }
66
67 void
68 sys_wait_for_child (pid_t child_pid, bool eof)
69 {
70 }
71
72 void
73 sys_spawn_shell (void)
74 {
75 spawnl (P_WAIT, getenv ("COMSPEC"), "-", 0);
76 }
77
78 /* stat() in djgpp's C library gives a constant number of 42 as the
79 uid and gid of a file. So, comparing an FTP'ed archive just after
80 unpack would fail on MSDOS. */
81
82 bool
83 sys_compare_uid (struct stat *a, struct stat *b)
84 {
85 return true;
86 }
87
88 bool
89 sys_compare_gid (struct stat *a, struct stat *b)
90 {
91 return true;
92 }
93
94 void
95 sys_compare_links (struct stat *link_data, struct stat *stat_data)
96 {
97 return true;
98 }
99
100 int
101 sys_truncate (int fd)
102 {
103 return write (fd, "", 0);
104 }
105
106 size_t
107 sys_write_archive_buffer (void)
108 {
109 return full_write (archive, record_start->buffer, record_size);
110 }
111
112 /* Set ARCHIVE for writing, then compressing an archive. */
113 void
114 sys_child_open_for_compress (void)
115 {
116 FATAL_ERROR ((0, 0, _("Cannot use compressed or remote archives")));
117 }
118
119 /* Set ARCHIVE for uncompressing, then reading an archive. */
120 void
121 sys_child_open_for_uncompress (void)
122 {
123 FATAL_ERROR ((0, 0, _("Cannot use compressed or remote archives")));
124 }
125
126 #else
127
128 extern union block *record_start; /* FIXME */
129
130 static struct stat archive_stat; /* stat block for archive file */
131
132 bool
133 sys_get_archive_stat (void)
134 {
135 return fstat (archive, &archive_stat) == 0;
136 }
137
138 bool
139 sys_file_is_archive (struct tar_stat_info *p)
140 {
141 return (ar_dev && p->stat.st_dev == ar_dev && p->stat.st_ino == ar_ino);
142 }
143
144 /* Save archive file inode and device numbers */
145 void
146 sys_save_archive_dev_ino (void)
147 {
148 if (!_isrmt (archive) && S_ISREG (archive_stat.st_mode))
149 {
150 ar_dev = archive_stat.st_dev;
151 ar_ino = archive_stat.st_ino;
152 }
153 else
154 ar_dev = 0;
155 }
156
157 /* Detect if outputting to "/dev/null". */
158 void
159 sys_detect_dev_null_output (void)
160 {
161 static char const dev_null[] = "/dev/null";
162 struct stat dev_null_stat;
163
164 dev_null_output = (strcmp (archive_name_array[0], dev_null) == 0
165 || (! _isrmt (archive)
166 && S_ISCHR (archive_stat.st_mode)
167 && stat (dev_null, &dev_null_stat) == 0
168 && archive_stat.st_dev == dev_null_stat.st_dev
169 && archive_stat.st_ino == dev_null_stat.st_ino));
170 }
171
172 void
173 sys_wait_for_child (pid_t child_pid, bool eof)
174 {
175 if (child_pid)
176 {
177 int wait_status;
178
179 while (waitpid (child_pid, &wait_status, 0) == -1)
180 if (errno != EINTR)
181 {
182 waitpid_error (use_compress_program_option);
183 break;
184 }
185
186 if (WIFSIGNALED (wait_status))
187 {
188 int sig = WTERMSIG (wait_status);
189 if (!(!eof && sig == SIGPIPE))
190 FATAL_ERROR ((0, 0, _("Child died with signal %d"), sig));
191 }
192 else if (WEXITSTATUS (wait_status) != 0)
193 FATAL_ERROR ((0, 0, _("Child returned status %d"),
194 WEXITSTATUS (wait_status)));
195 }
196 }
197
198 void
199 sys_spawn_shell (void)
200 {
201 pid_t child;
202 const char *shell = getenv ("SHELL");
203 if (! shell)
204 shell = "/bin/sh";
205 child = xfork ();
206 if (child == 0)
207 {
208 priv_set_restore_linkdir ();
209 execlp (shell, "-sh", "-i", NULL);
210 exec_fatal (shell);
211 }
212 else
213 {
214 int wait_status;
215 while (waitpid (child, &wait_status, 0) == -1)
216 if (errno != EINTR)
217 {
218 waitpid_error (shell);
219 break;
220 }
221 }
222 }
223
224 bool
225 sys_compare_uid (struct stat *a, struct stat *b)
226 {
227 return a->st_uid == b->st_uid;
228 }
229
230 bool
231 sys_compare_gid (struct stat *a, struct stat *b)
232 {
233 return a->st_gid == b->st_gid;
234 }
235
236 bool
237 sys_compare_links (struct stat *link_data, struct stat *stat_data)
238 {
239 return stat_data->st_dev == link_data->st_dev
240 && stat_data->st_ino == link_data->st_ino;
241 }
242
243 int
244 sys_truncate (int fd)
245 {
246 off_t pos = lseek (fd, (off_t) 0, SEEK_CUR);
247 return pos < 0 ? -1 : ftruncate (fd, pos);
248 }
249
250 /* Return nonzero if NAME is the name of a regular file, or if the file
251 does not exist (so it would be created as a regular file). */
252 static int
253 is_regular_file (const char *name)
254 {
255 struct stat stbuf;
256
257 if (stat (name, &stbuf) == 0)
258 return S_ISREG (stbuf.st_mode);
259 else
260 return errno == ENOENT;
261 }
262
263 size_t
264 sys_write_archive_buffer (void)
265 {
266 return rmtwrite (archive, record_start->buffer, record_size);
267 }
268
269 #define PREAD 0 /* read file descriptor from pipe() */
270 #define PWRITE 1 /* write file descriptor from pipe() */
271
272 /* Duplicate file descriptor FROM into becoming INTO.
273 INTO is closed first and has to be the next available slot. */
274 static void
275 xdup2 (int from, int into)
276 {
277 if (from != into)
278 {
279 int status = close (into);
280
281 if (status != 0 && errno != EBADF)
282 {
283 int e = errno;
284 FATAL_ERROR ((0, e, _("Cannot close")));
285 }
286 status = dup (from);
287 if (status != into)
288 {
289 if (status < 0)
290 {
291 int e = errno;
292 FATAL_ERROR ((0, e, _("Cannot dup")));
293 }
294 abort ();
295 }
296 xclose (from);
297 }
298 }
299
300 static void wait_for_grandchild (pid_t pid) __attribute__ ((__noreturn__));
301
302 /* Propagate any failure of the grandchild back to the parent. */
303 static void
304 wait_for_grandchild (pid_t pid)
305 {
306 int wait_status;
307 int exit_code = 0;
308
309 while (waitpid (pid, &wait_status, 0) == -1)
310 if (errno != EINTR)
311 {
312 waitpid_error (use_compress_program_option);
313 break;
314 }
315
316 if (WIFSIGNALED (wait_status))
317 raise (WTERMSIG (wait_status));
318 else if (WEXITSTATUS (wait_status) != 0)
319 exit_code = WEXITSTATUS (wait_status);
320
321 exit (exit_code);
322 }
323
324 /* Set ARCHIVE for writing, then compressing an archive. */
325 pid_t
326 sys_child_open_for_compress (void)
327 {
328 int parent_pipe[2];
329 int child_pipe[2];
330 pid_t grandchild_pid;
331 pid_t child_pid;
332
333 xpipe (parent_pipe);
334 child_pid = xfork ();
335
336 if (child_pid > 0)
337 {
338 /* The parent tar is still here! Just clean up. */
339
340 archive = parent_pipe[PWRITE];
341 xclose (parent_pipe[PREAD]);
342 return child_pid;
343 }
344
345 /* The new born child tar is here! */
346
347 set_program_name (_("tar (child)"));
348 signal (SIGPIPE, SIG_DFL);
349
350 xdup2 (parent_pipe[PREAD], STDIN_FILENO);
351 xclose (parent_pipe[PWRITE]);
352
353 /* Check if we need a grandchild tar. This happens only if either:
354 a) the file is to be accessed by rmt: compressor doesn't know how;
355 b) the file is not a plain file. */
356
357 if (!_remdev (archive_name_array[0])
358 && is_regular_file (archive_name_array[0]))
359 {
360 if (backup_option)
361 maybe_backup_file (archive_name_array[0], 1);
362
363 /* We don't need a grandchild tar. Open the archive and launch the
364 compressor. */
365 if (strcmp (archive_name_array[0], "-"))
366 {
367 archive = creat (archive_name_array[0], MODE_RW);
368 if (archive < 0)
369 {
370 int saved_errno = errno;
371
372 if (backup_option)
373 undo_last_backup ();
374 errno = saved_errno;
375 open_fatal (archive_name_array[0]);
376 }
377 xdup2 (archive, STDOUT_FILENO);
378 }
379 priv_set_restore_linkdir ();
380 xexec (use_compress_program_option);
381 }
382
383 /* We do need a grandchild tar. */
384
385 xpipe (child_pipe);
386 grandchild_pid = xfork ();
387
388 if (grandchild_pid == 0)
389 {
390 /* The newborn grandchild tar is here! Launch the compressor. */
391
392 set_program_name (_("tar (grandchild)"));
393
394 xdup2 (child_pipe[PWRITE], STDOUT_FILENO);
395 xclose (child_pipe[PREAD]);
396 priv_set_restore_linkdir ();
397 xexec (use_compress_program_option);
398 }
399
400 /* The child tar is still here! */
401
402 /* Prepare for reblocking the data from the compressor into the archive. */
403
404 xdup2 (child_pipe[PREAD], STDIN_FILENO);
405 xclose (child_pipe[PWRITE]);
406
407 if (strcmp (archive_name_array[0], "-") == 0)
408 archive = STDOUT_FILENO;
409 else
410 {
411 archive = rmtcreat (archive_name_array[0], MODE_RW, rsh_command_option);
412 if (archive < 0)
413 open_fatal (archive_name_array[0]);
414 }
415
416 /* Let's read out of the stdin pipe and write an archive. */
417
418 while (1)
419 {
420 size_t status = 0;
421 char *cursor;
422 size_t length;
423
424 /* Assemble a record. */
425
426 for (length = 0, cursor = record_start->buffer;
427 length < record_size;
428 length += status, cursor += status)
429 {
430 size_t size = record_size - length;
431
432 status = safe_read (STDIN_FILENO, cursor, size);
433 if (status == SAFE_READ_ERROR)
434 read_fatal (use_compress_program_option);
435 if (status == 0)
436 break;
437 }
438
439 /* Copy the record. */
440
441 if (status == 0)
442 {
443 /* We hit the end of the file. Write last record at
444 full length, as the only role of the grandchild is
445 doing proper reblocking. */
446
447 if (length > 0)
448 {
449 memset (record_start->buffer + length, 0, record_size - length);
450 status = sys_write_archive_buffer ();
451 if (status != record_size)
452 archive_write_error (status);
453 }
454
455 /* There is nothing else to read, break out. */
456 break;
457 }
458
459 status = sys_write_archive_buffer ();
460 if (status != record_size)
461 archive_write_error (status);
462 }
463
464 wait_for_grandchild (grandchild_pid);
465 }
466
467 static void
468 run_decompress_program (void)
469 {
470 int i;
471 const char *p, *prog = NULL;
472 struct wordsplit ws;
473 int wsflags = (WRDSF_DEFFLAGS | WRDSF_ENV | WRDSF_DOOFFS) & ~WRDSF_NOVAR;
474
475 ws.ws_env = (const char **) environ;
476 ws.ws_offs = 1;
477
478 for (p = first_decompress_program (&i); p; p = next_decompress_program (&i))
479 {
480 if (prog)
481 {
482 WARNOPT (WARN_DECOMPRESS_PROGRAM,
483 (0, errno, _("cannot run %s"), prog));
484 WARNOPT (WARN_DECOMPRESS_PROGRAM,
485 (0, 0, _("trying %s"), p));
486 }
487 if (wordsplit (p, &ws, wsflags))
488 FATAL_ERROR ((0, 0, _("cannot split string '%s': %s"),
489 p, wordsplit_strerror (&ws)));
490 wsflags |= WRDSF_REUSE;
491 memmove(ws.ws_wordv, ws.ws_wordv + ws.ws_offs,
492 sizeof(ws.ws_wordv[0])*ws.ws_wordc);
493 ws.ws_wordv[ws.ws_wordc] = (char *) "-d";
494 prog = p;
495 execvp (ws.ws_wordv[0], ws.ws_wordv);
496 ws.ws_wordv[ws.ws_wordc] = NULL;
497 }
498 if (!prog)
499 FATAL_ERROR ((0, 0, _("unable to run decompression program")));
500 exec_fatal (prog);
501 }
502
503 /* Set ARCHIVE for uncompressing, then reading an archive. */
504 pid_t
505 sys_child_open_for_uncompress (void)
506 {
507 int parent_pipe[2];
508 int child_pipe[2];
509 pid_t grandchild_pid;
510 pid_t child_pid;
511
512 xpipe (parent_pipe);
513 child_pid = xfork ();
514
515 if (child_pid > 0)
516 {
517 /* The parent tar is still here! Just clean up. */
518
519 archive = parent_pipe[PREAD];
520 xclose (parent_pipe[PWRITE]);
521 return child_pid;
522 }
523
524 /* The newborn child tar is here! */
525
526 set_program_name (_("tar (child)"));
527 signal (SIGPIPE, SIG_DFL);
528
529 xdup2 (parent_pipe[PWRITE], STDOUT_FILENO);
530 xclose (parent_pipe[PREAD]);
531
532 /* Check if we need a grandchild tar. This happens only if either:
533 a) we're reading stdin: to force unblocking;
534 b) the file is to be accessed by rmt: compressor doesn't know how;
535 c) the file is not a plain file. */
536
537 if (strcmp (archive_name_array[0], "-") != 0
538 && !_remdev (archive_name_array[0])
539 && is_regular_file (archive_name_array[0]))
540 {
541 /* We don't need a grandchild tar. Open the archive and lauch the
542 uncompressor. */
543
544 archive = open (archive_name_array[0], O_RDONLY | O_BINARY, MODE_RW);
545 if (archive < 0)
546 open_fatal (archive_name_array[0]);
547 xdup2 (archive, STDIN_FILENO);
548 priv_set_restore_linkdir ();
549 run_decompress_program ();
550 }
551
552 /* We do need a grandchild tar. */
553
554 xpipe (child_pipe);
555 grandchild_pid = xfork ();
556
557 if (grandchild_pid == 0)
558 {
559 /* The newborn grandchild tar is here! Launch the uncompressor. */
560
561 set_program_name (_("tar (grandchild)"));
562
563 xdup2 (child_pipe[PREAD], STDIN_FILENO);
564 xclose (child_pipe[PWRITE]);
565 priv_set_restore_linkdir ();
566 run_decompress_program ();
567 }
568
569 /* The child tar is still here! */
570
571 /* Prepare for unblocking the data from the archive into the
572 uncompressor. */
573
574 xdup2 (child_pipe[PWRITE], STDOUT_FILENO);
575 xclose (child_pipe[PREAD]);
576
577 if (strcmp (archive_name_array[0], "-") == 0)
578 archive = STDIN_FILENO;
579 else
580 archive = rmtopen (archive_name_array[0], O_RDONLY | O_BINARY,
581 MODE_RW, rsh_command_option);
582 if (archive < 0)
583 open_fatal (archive_name_array[0]);
584
585 /* Let's read the archive and pipe it into stdout. */
586
587 while (1)
588 {
589 char *cursor;
590 size_t maximum;
591 size_t count;
592 size_t status;
593
594 clear_read_error_count ();
595
596 error_loop:
597 status = rmtread (archive, record_start->buffer, record_size);
598 if (status == SAFE_READ_ERROR)
599 {
600 archive_read_error ();
601 goto error_loop;
602 }
603 if (status == 0)
604 break;
605 cursor = record_start->buffer;
606 maximum = status;
607 while (maximum)
608 {
609 count = maximum < BLOCKSIZE ? maximum : BLOCKSIZE;
610 if (full_write (STDOUT_FILENO, cursor, count) != count)
611 write_error (use_compress_program_option);
612 cursor += count;
613 maximum -= count;
614 }
615 }
616
617 xclose (STDOUT_FILENO);
618
619 wait_for_grandchild (grandchild_pid);
620 }
621
622 \f
623
624 static void
625 dec_to_env (char const *envar, uintmax_t num)
626 {
627 char buf[UINTMAX_STRSIZE_BOUND];
628 char *numstr;
629
630 numstr = STRINGIFY_BIGINT (num, buf);
631 if (setenv (envar, numstr, 1) != 0)
632 xalloc_die ();
633 }
634
635 static void
636 time_to_env (char const *envar, struct timespec t)
637 {
638 char buf[TIMESPEC_STRSIZE_BOUND];
639 if (setenv (envar, code_timespec (t, buf), 1) != 0)
640 xalloc_die ();
641 }
642
643 static void
644 oct_to_env (char const *envar, unsigned long num)
645 {
646 char buf[1+1+(sizeof(unsigned long)*CHAR_BIT+2)/3];
647
648 snprintf (buf, sizeof buf, "0%lo", num);
649 if (setenv (envar, buf, 1) != 0)
650 xalloc_die ();
651 }
652
653 static void
654 str_to_env (char const *envar, char const *str)
655 {
656 if (str)
657 {
658 if (setenv (envar, str, 1) != 0)
659 xalloc_die ();
660 }
661 else
662 unsetenv (envar);
663 }
664
665 static void
666 chr_to_env (char const *envar, char c)
667 {
668 char buf[2];
669 buf[0] = c;
670 buf[1] = 0;
671 if (setenv (envar, buf, 1) != 0)
672 xalloc_die ();
673 }
674
675 static void
676 stat_to_env (char *name, char type, struct tar_stat_info *st)
677 {
678 str_to_env ("TAR_VERSION", PACKAGE_VERSION);
679 str_to_env ("TAR_ARCHIVE", *archive_name_cursor);
680 dec_to_env ("TAR_VOLUME", archive_name_cursor - archive_name_array + 1);
681 dec_to_env ("TAR_BLOCKING_FACTOR", blocking_factor);
682 str_to_env ("TAR_FORMAT",
683 archive_format_string (current_format == DEFAULT_FORMAT ?
684 archive_format : current_format));
685 chr_to_env ("TAR_FILETYPE", type);
686 oct_to_env ("TAR_MODE", st->stat.st_mode);
687 str_to_env ("TAR_FILENAME", name);
688 str_to_env ("TAR_REALNAME", st->file_name);
689 str_to_env ("TAR_UNAME", st->uname);
690 str_to_env ("TAR_GNAME", st->gname);
691 time_to_env ("TAR_ATIME", st->atime);
692 time_to_env ("TAR_MTIME", st->mtime);
693 time_to_env ("TAR_CTIME", st->ctime);
694 dec_to_env ("TAR_SIZE", st->stat.st_size);
695 dec_to_env ("TAR_UID", st->stat.st_uid);
696 dec_to_env ("TAR_GID", st->stat.st_gid);
697
698 switch (type)
699 {
700 case 'b':
701 case 'c':
702 dec_to_env ("TAR_MINOR", minor (st->stat.st_rdev));
703 dec_to_env ("TAR_MAJOR", major (st->stat.st_rdev));
704 unsetenv ("TAR_LINKNAME");
705 break;
706
707 case 'l':
708 case 'h':
709 unsetenv ("TAR_MINOR");
710 unsetenv ("TAR_MAJOR");
711 str_to_env ("TAR_LINKNAME", st->link_name);
712 break;
713
714 default:
715 unsetenv ("TAR_MINOR");
716 unsetenv ("TAR_MAJOR");
717 unsetenv ("TAR_LINKNAME");
718 break;
719 }
720 }
721
722 static pid_t global_pid;
723 static void (*pipe_handler) (int sig);
724
725 int
726 sys_exec_command (char *file_name, int typechar, struct tar_stat_info *st)
727 {
728 int p[2];
729
730 xpipe (p);
731 pipe_handler = signal (SIGPIPE, SIG_IGN);
732 global_pid = xfork ();
733
734 if (global_pid != 0)
735 {
736 xclose (p[PREAD]);
737 return p[PWRITE];
738 }
739
740 /* Child */
741 xdup2 (p[PREAD], STDIN_FILENO);
742 xclose (p[PWRITE]);
743
744 stat_to_env (file_name, typechar, st);
745
746 priv_set_restore_linkdir ();
747 xexec (to_command_option);
748 }
749
750 void
751 sys_wait_command (void)
752 {
753 int status;
754
755 if (global_pid < 0)
756 return;
757
758 signal (SIGPIPE, pipe_handler);
759 while (waitpid (global_pid, &status, 0) == -1)
760 if (errno != EINTR)
761 {
762 global_pid = -1;
763 waitpid_error (to_command_option);
764 return;
765 }
766
767 if (WIFEXITED (status))
768 {
769 if (!ignore_command_error_option && WEXITSTATUS (status))
770 ERROR ((0, 0, _("%lu: Child returned status %d"),
771 (unsigned long) global_pid, WEXITSTATUS (status)));
772 }
773 else if (WIFSIGNALED (status))
774 {
775 WARN ((0, 0, _("%lu: Child terminated on signal %d"),
776 (unsigned long) global_pid, WTERMSIG (status)));
777 }
778 else
779 ERROR ((0, 0, _("%lu: Child terminated on unknown reason"),
780 (unsigned long) global_pid));
781
782 global_pid = -1;
783 }
784
785 int
786 sys_exec_info_script (const char **archive_name, int volume_number)
787 {
788 pid_t pid;
789 char uintbuf[UINTMAX_STRSIZE_BOUND];
790 int p[2];
791 static void (*saved_handler) (int sig);
792
793 xpipe (p);
794 saved_handler = signal (SIGPIPE, SIG_IGN);
795
796 pid = xfork ();
797
798 if (pid != 0)
799 {
800 /* Master */
801
802 int rc;
803 int status;
804 char *buf = NULL;
805 size_t size = 0;
806 FILE *fp;
807
808 xclose (p[PWRITE]);
809 fp = fdopen (p[PREAD], "r");
810 rc = getline (&buf, &size, fp);
811 fclose (fp);
812
813 if (rc > 0 && buf[rc-1] == '\n')
814 buf[--rc] = 0;
815
816 while (waitpid (pid, &status, 0) == -1)
817 if (errno != EINTR)
818 {
819 signal (SIGPIPE, saved_handler);
820 waitpid_error (info_script_option);
821 return -1;
822 }
823
824 signal (SIGPIPE, saved_handler);
825
826 if (WIFEXITED (status))
827 {
828 if (WEXITSTATUS (status) == 0 && rc > 0)
829 *archive_name = buf;
830 else
831 free (buf);
832 return WEXITSTATUS (status);
833 }
834
835 free (buf);
836 return -1;
837 }
838
839 /* Child */
840 setenv ("TAR_VERSION", PACKAGE_VERSION, 1);
841 setenv ("TAR_ARCHIVE", *archive_name, 1);
842 setenv ("TAR_VOLUME", STRINGIFY_BIGINT (volume_number, uintbuf), 1);
843 setenv ("TAR_BLOCKING_FACTOR",
844 STRINGIFY_BIGINT (blocking_factor, uintbuf), 1);
845 setenv ("TAR_SUBCOMMAND", subcommand_string (subcommand_option), 1);
846 setenv ("TAR_FORMAT",
847 archive_format_string (current_format == DEFAULT_FORMAT ?
848 archive_format : current_format), 1);
849 setenv ("TAR_FD", STRINGIFY_BIGINT (p[PWRITE], uintbuf), 1);
850
851 xclose (p[PREAD]);
852
853 priv_set_restore_linkdir ();
854 xexec (info_script_option);
855 }
856
857 void
858 sys_exec_checkpoint_script (const char *script_name,
859 const char *archive_name,
860 int checkpoint_number)
861 {
862 pid_t pid;
863 char uintbuf[UINTMAX_STRSIZE_BOUND];
864
865 pid = xfork ();
866
867 if (pid != 0)
868 {
869 /* Master */
870
871 int status;
872
873 while (waitpid (pid, &status, 0) == -1)
874 if (errno != EINTR)
875 {
876 waitpid_error (script_name);
877 break;
878 }
879
880 return;
881 }
882
883 /* Child */
884 setenv ("TAR_VERSION", PACKAGE_VERSION, 1);
885 setenv ("TAR_ARCHIVE", archive_name, 1);
886 setenv ("TAR_CHECKPOINT", STRINGIFY_BIGINT (checkpoint_number, uintbuf), 1);
887 setenv ("TAR_BLOCKING_FACTOR",
888 STRINGIFY_BIGINT (blocking_factor, uintbuf), 1);
889 setenv ("TAR_SUBCOMMAND", subcommand_string (subcommand_option), 1);
890 setenv ("TAR_FORMAT",
891 archive_format_string (current_format == DEFAULT_FORMAT ?
892 archive_format : current_format), 1);
893 priv_set_restore_linkdir ();
894 xexec (script_name);
895 }
896
897 #endif /* not MSDOS */
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