4c7a3798d8
This simplifies code that would otherwise use dup and close. * gnulib.modules: Add dup2. * src/system.c: Add #pragma to pacify GCC 13. (xdup2): Simplify by using dup2.
920 lines
21 KiB
C
920 lines
21 KiB
C
/* System-dependent calls for tar.
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Copyright 2003-2023 Free Software Foundation, Inc.
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This program is free software; you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published by the
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Free Software Foundation; either version 3, or (at your option) any later
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version.
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This program is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
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Public License for more details.
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You should have received a copy of the GNU General Public License along
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with this program. If not, see <http://www.gnu.org/licenses/>. */
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#include <system.h>
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#include <system-ioctl.h>
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#include "common.h"
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#include <priv-set.h>
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#include <rmt.h>
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#include <signal.h>
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#include <wordsplit.h>
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static _Noreturn void
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xexec (const char *cmd)
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{
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char *argv[4];
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argv[0] = (char *) "/bin/sh";
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argv[1] = (char *) "-c";
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argv[2] = (char *) cmd;
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argv[3] = NULL;
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execv ("/bin/sh", argv);
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exec_fatal (cmd);
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}
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/* True if the archive is seekable via ioctl and MTIOCTOP,
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or if it is not known whether it is seekable.
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False if it is known to be not seekable. */
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static bool mtioseekable_archive;
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bool
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mtioseek (bool count_files, off_t count)
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{
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if (mtioseekable_archive)
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{
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#ifdef MTIOCTOP
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struct mtop operation;
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operation.mt_op = (count_files
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? (count < 0 ? MTBSF : MTFSF)
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: (count < 0 ? MTBSR : MTFSR));
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if (! (count < 0
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? INT_SUBTRACT_WRAPV (0, count, &operation.mt_count)
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: INT_ADD_WRAPV (count, 0, &operation.mt_count))
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&& (0 <= rmtioctl (archive, MTIOCTOP, &operation)
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|| (errno == EIO
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&& 0 <= rmtioctl (archive, MTIOCTOP, &operation))))
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return true;
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#endif
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mtioseekable_archive = false;
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}
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return false;
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}
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#if MSDOS
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bool
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sys_get_archive_stat (void)
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{
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return 0;
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}
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bool
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sys_file_is_archive (struct tar_stat_info *p)
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{
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return false;
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}
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void
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sys_detect_dev_null_output (void)
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{
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static char const dev_null[] = "nul";
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dev_null_output = (strcmp (archive_name_array[0], dev_null) == 0
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|| (! _isrmt (archive)));
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}
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void
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sys_wait_for_child (pid_t child_pid, bool eof)
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{
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}
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void
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sys_spawn_shell (void)
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{
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spawnl (P_WAIT, getenv ("COMSPEC"), "-", 0);
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}
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/* stat() in djgpp's C library gives a constant number of 42 as the
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uid and gid of a file. So, comparing an FTP'ed archive just after
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unpack would fail on MSDOS. */
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bool
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sys_compare_uid (struct stat *a, struct stat *b)
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{
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return true;
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}
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bool
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sys_compare_gid (struct stat *a, struct stat *b)
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{
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return true;
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}
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void
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sys_compare_links (struct stat *link_data, struct stat *stat_data)
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{
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return true;
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}
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int
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sys_truncate (int fd)
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{
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return write (fd, "", 0);
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}
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size_t
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sys_write_archive_buffer (void)
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{
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return full_write (archive, record_start->buffer, record_size);
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}
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/* Set ARCHIVE for writing, then compressing an archive. */
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void
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sys_child_open_for_compress (void)
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{
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FATAL_ERROR ((0, 0, _("Cannot use compressed or remote archives")));
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}
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/* Set ARCHIVE for uncompressing, then reading an archive. */
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void
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sys_child_open_for_uncompress (void)
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{
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FATAL_ERROR ((0, 0, _("Cannot use compressed or remote archives")));
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}
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#else
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extern union block *record_start; /* FIXME */
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bool
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sys_get_archive_stat (void)
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{
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bool remote = _isrmt (archive);
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mtioseekable_archive = true;
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if (!remote && 0 <= archive && fstat (archive, &archive_stat) == 0)
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{
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if (!S_ISCHR (archive_stat.st_mode))
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mtioseekable_archive = false;
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return true;
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}
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else
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{
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/* FIXME: This memset should not be needed. It is present only
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because other parts of tar may incorrectly access
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archive_stat even if it's not the archive status. */
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memset (&archive_stat, 0, sizeof archive_stat);
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return remote;
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}
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}
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bool
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sys_file_is_archive (struct tar_stat_info *p)
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{
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return (!dev_null_output && !_isrmt (archive)
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&& p->stat.st_dev == archive_stat.st_dev
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&& p->stat.st_ino == archive_stat.st_ino);
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}
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/* Detect if outputting to "/dev/null". */
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void
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sys_detect_dev_null_output (void)
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{
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static char const dev_null[] = "/dev/null";
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static struct stat dev_null_stat;
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dev_null_output = (strcmp (archive_name_array[0], dev_null) == 0
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|| (! _isrmt (archive)
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&& S_ISCHR (archive_stat.st_mode)
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&& (dev_null_stat.st_ino != 0
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|| stat (dev_null, &dev_null_stat) == 0)
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&& archive_stat.st_ino == dev_null_stat.st_ino
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&& archive_stat.st_dev == dev_null_stat.st_dev));
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}
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void
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sys_wait_for_child (pid_t child_pid, bool eof)
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{
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if (child_pid)
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{
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int wait_status;
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while (waitpid (child_pid, &wait_status, 0) == -1)
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if (errno != EINTR)
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{
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waitpid_error (use_compress_program_option);
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break;
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}
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if (WIFSIGNALED (wait_status))
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{
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int sig = WTERMSIG (wait_status);
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if (!(!eof && sig == SIGPIPE))
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FATAL_ERROR ((0, 0, _("Child died with signal %d"), sig));
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}
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else if (WEXITSTATUS (wait_status) != 0)
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FATAL_ERROR ((0, 0, _("Child returned status %d"),
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WEXITSTATUS (wait_status)));
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}
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}
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void
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sys_spawn_shell (void)
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{
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pid_t child;
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const char *shell = getenv ("SHELL");
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if (! shell)
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shell = "/bin/sh";
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child = xfork ();
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if (child == 0)
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{
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priv_set_restore_linkdir ();
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execlp (shell, "-sh", "-i", NULL);
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exec_fatal (shell);
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}
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else
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{
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int wait_status;
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while (waitpid (child, &wait_status, 0) == -1)
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if (errno != EINTR)
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{
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waitpid_error (shell);
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break;
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}
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}
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}
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bool
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sys_compare_uid (struct stat *a, struct stat *b)
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{
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return a->st_uid == b->st_uid;
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}
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bool
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sys_compare_gid (struct stat *a, struct stat *b)
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{
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return a->st_gid == b->st_gid;
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}
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bool
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sys_compare_links (struct stat *link_data, struct stat *stat_data)
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{
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return stat_data->st_dev == link_data->st_dev
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&& stat_data->st_ino == link_data->st_ino;
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}
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int
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sys_truncate (int fd)
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{
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off_t pos = lseek (fd, (off_t) 0, SEEK_CUR);
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return pos < 0 ? -1 : ftruncate (fd, pos);
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}
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/* Return nonzero if NAME is the name of a regular file, or if the file
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does not exist (so it would be created as a regular file). */
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static int
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is_regular_file (const char *name)
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{
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struct stat stbuf;
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if (stat (name, &stbuf) == 0)
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return S_ISREG (stbuf.st_mode);
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else
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return errno == ENOENT;
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}
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size_t
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sys_write_archive_buffer (void)
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{
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return rmtwrite (archive, record_start->buffer, record_size);
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}
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#define PREAD 0 /* read file descriptor from pipe() */
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#define PWRITE 1 /* write file descriptor from pipe() */
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/* Work around GCC bug 109839. */
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#if 13 <= __GNUC__
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# pragma GCC diagnostic ignored "-Wanalyzer-fd-leak"
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#endif
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/* Duplicate file descriptor FROM into becoming INTO.
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INTO is closed first and has to be the next available slot. */
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static void
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xdup2 (int from, int into)
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{
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if (from != into)
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{
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if (dup2 (from, into) < 0)
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{
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int e = errno;
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FATAL_ERROR ((0, e, _("Cannot dup2")));
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}
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xclose (from);
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}
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}
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/* Propagate any failure of the grandchild back to the parent. */
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static _Noreturn void
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wait_for_grandchild (pid_t pid)
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{
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int wait_status;
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int exit_code = 0;
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while (waitpid (pid, &wait_status, 0) == -1)
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if (errno != EINTR)
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{
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waitpid_error (use_compress_program_option);
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break;
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}
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if (WIFSIGNALED (wait_status))
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raise (WTERMSIG (wait_status));
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else if (WEXITSTATUS (wait_status) != 0)
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exit_code = WEXITSTATUS (wait_status);
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exit (exit_code);
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}
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/* Set ARCHIVE for writing, then compressing an archive. */
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pid_t
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sys_child_open_for_compress (void)
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{
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int parent_pipe[2];
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int child_pipe[2];
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pid_t grandchild_pid;
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pid_t child_pid;
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signal (SIGPIPE, SIG_IGN);
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xpipe (parent_pipe);
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child_pid = xfork ();
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if (child_pid > 0)
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{
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/* The parent tar is still here! Just clean up. */
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archive = parent_pipe[PWRITE];
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xclose (parent_pipe[PREAD]);
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return child_pid;
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}
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/* The new born child tar is here! */
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set_program_name (_("tar (child)"));
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signal (SIGPIPE, SIG_DFL);
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xdup2 (parent_pipe[PREAD], STDIN_FILENO);
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xclose (parent_pipe[PWRITE]);
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/* Check if we need a grandchild tar. This happens only if either:
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a) the file is to be accessed by rmt: compressor doesn't know how;
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b) the file is not a plain file. */
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if (!_remdev (archive_name_array[0])
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&& is_regular_file (archive_name_array[0]))
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{
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if (backup_option)
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maybe_backup_file (archive_name_array[0], 1);
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/* We don't need a grandchild tar. Open the archive and launch the
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compressor. */
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if (strcmp (archive_name_array[0], "-"))
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{
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archive = creat (archive_name_array[0], MODE_RW);
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if (archive < 0)
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{
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int saved_errno = errno;
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if (backup_option)
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undo_last_backup ();
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errno = saved_errno;
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open_fatal (archive_name_array[0]);
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}
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xdup2 (archive, STDOUT_FILENO);
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}
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priv_set_restore_linkdir ();
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xexec (use_compress_program_option);
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}
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/* We do need a grandchild tar. */
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xpipe (child_pipe);
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grandchild_pid = xfork ();
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if (grandchild_pid == 0)
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{
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/* The newborn grandchild tar is here! Launch the compressor. */
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set_program_name (_("tar (grandchild)"));
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xdup2 (child_pipe[PWRITE], STDOUT_FILENO);
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xclose (child_pipe[PREAD]);
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priv_set_restore_linkdir ();
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xexec (use_compress_program_option);
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}
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/* The child tar is still here! */
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/* Prepare for reblocking the data from the compressor into the archive. */
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xdup2 (child_pipe[PREAD], STDIN_FILENO);
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xclose (child_pipe[PWRITE]);
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if (strcmp (archive_name_array[0], "-") == 0)
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archive = STDOUT_FILENO;
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else
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{
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archive = rmtcreat (archive_name_array[0], MODE_RW, rsh_command_option);
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if (archive < 0)
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open_fatal (archive_name_array[0]);
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}
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/* Let's read out of the stdin pipe and write an archive. */
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while (1)
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{
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size_t status = 0;
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char *cursor;
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size_t length;
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/* Assemble a record. */
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for (length = 0, cursor = record_start->buffer;
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length < record_size;
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length += status, cursor += status)
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{
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size_t size = record_size - length;
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status = safe_read (STDIN_FILENO, cursor, size);
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if (status == SAFE_READ_ERROR)
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read_fatal (use_compress_program_option);
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if (status == 0)
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break;
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}
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/* Copy the record. */
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if (status == 0)
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{
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/* We hit the end of the file. Write last record at
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full length, as the only role of the grandchild is
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doing proper reblocking. */
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if (length > 0)
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{
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memset (record_start->buffer + length, 0, record_size - length);
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status = sys_write_archive_buffer ();
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if (status != record_size)
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archive_write_error (status);
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}
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/* There is nothing else to read, break out. */
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break;
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}
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status = sys_write_archive_buffer ();
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if (status != record_size)
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archive_write_error (status);
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}
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wait_for_grandchild (grandchild_pid);
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}
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static void
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run_decompress_program (void)
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{
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int i;
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const char *p, *prog = NULL;
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struct wordsplit ws;
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int wsflags = (WRDSF_DEFFLAGS | WRDSF_ENV | WRDSF_DOOFFS) & ~WRDSF_NOVAR;
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ws.ws_env = (const char **) environ;
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ws.ws_offs = 1;
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for (p = first_decompress_program (&i); p; p = next_decompress_program (&i))
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{
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if (prog)
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{
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WARNOPT (WARN_DECOMPRESS_PROGRAM,
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(0, errno, _("cannot run %s"), prog));
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WARNOPT (WARN_DECOMPRESS_PROGRAM,
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(0, 0, _("trying %s"), p));
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}
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if (wordsplit (p, &ws, wsflags))
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FATAL_ERROR ((0, 0, _("cannot split string '%s': %s"),
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p, wordsplit_strerror (&ws)));
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wsflags |= WRDSF_REUSE;
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memmove(ws.ws_wordv, ws.ws_wordv + ws.ws_offs,
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sizeof(ws.ws_wordv[0])*ws.ws_wordc);
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ws.ws_wordv[ws.ws_wordc] = (char *) "-d";
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prog = p;
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execvp (ws.ws_wordv[0], ws.ws_wordv);
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ws.ws_wordv[ws.ws_wordc] = NULL;
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}
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if (!prog)
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FATAL_ERROR ((0, 0, _("unable to run decompression program")));
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exec_fatal (prog);
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}
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/* Set ARCHIVE for uncompressing, then reading an archive. */
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pid_t
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sys_child_open_for_uncompress (void)
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{
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int parent_pipe[2];
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int child_pipe[2];
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pid_t grandchild_pid;
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pid_t child_pid;
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xpipe (parent_pipe);
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child_pid = xfork ();
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if (child_pid > 0)
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{
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/* The parent tar is still here! Just clean up. */
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archive = parent_pipe[PREAD];
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xclose (parent_pipe[PWRITE]);
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return child_pid;
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}
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/* The newborn child tar is here! */
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set_program_name (_("tar (child)"));
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signal (SIGPIPE, SIG_DFL);
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xdup2 (parent_pipe[PWRITE], STDOUT_FILENO);
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xclose (parent_pipe[PREAD]);
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/* Check if we need a grandchild tar. This happens only if either:
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a) we're reading stdin: to force unblocking;
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b) the file is to be accessed by rmt: compressor doesn't know how;
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c) the file is not a plain file. */
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if (strcmp (archive_name_array[0], "-") != 0
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&& !_remdev (archive_name_array[0])
|
||
&& is_regular_file (archive_name_array[0]))
|
||
{
|
||
/* We don't need a grandchild tar. Open the archive and launch the
|
||
uncompressor. */
|
||
|
||
archive = open (archive_name_array[0], O_RDONLY | O_BINARY, MODE_RW);
|
||
if (archive < 0)
|
||
open_fatal (archive_name_array[0]);
|
||
xdup2 (archive, STDIN_FILENO);
|
||
priv_set_restore_linkdir ();
|
||
run_decompress_program ();
|
||
}
|
||
|
||
/* We do need a grandchild tar. */
|
||
|
||
xpipe (child_pipe);
|
||
grandchild_pid = xfork ();
|
||
|
||
if (grandchild_pid == 0)
|
||
{
|
||
/* The newborn grandchild tar is here! Launch the uncompressor. */
|
||
|
||
set_program_name (_("tar (grandchild)"));
|
||
|
||
xdup2 (child_pipe[PREAD], STDIN_FILENO);
|
||
xclose (child_pipe[PWRITE]);
|
||
priv_set_restore_linkdir ();
|
||
run_decompress_program ();
|
||
}
|
||
|
||
/* The child tar is still here! */
|
||
|
||
/* Prepare for unblocking the data from the archive into the
|
||
uncompressor. */
|
||
|
||
xdup2 (child_pipe[PWRITE], STDOUT_FILENO);
|
||
xclose (child_pipe[PREAD]);
|
||
|
||
if (strcmp (archive_name_array[0], "-") == 0)
|
||
archive = STDIN_FILENO;
|
||
else
|
||
archive = rmtopen (archive_name_array[0], O_RDONLY | O_BINARY,
|
||
MODE_RW, rsh_command_option);
|
||
if (archive < 0)
|
||
open_fatal (archive_name_array[0]);
|
||
|
||
/* Let's read the archive and pipe it into stdout. */
|
||
|
||
while (1)
|
||
{
|
||
char *cursor;
|
||
size_t maximum;
|
||
size_t count;
|
||
size_t status;
|
||
|
||
clear_read_error_count ();
|
||
|
||
error_loop:
|
||
status = rmtread (archive, record_start->buffer, record_size);
|
||
if (status == SAFE_READ_ERROR)
|
||
{
|
||
archive_read_error ();
|
||
goto error_loop;
|
||
}
|
||
if (status == 0)
|
||
break;
|
||
cursor = record_start->buffer;
|
||
maximum = status;
|
||
while (maximum)
|
||
{
|
||
count = maximum < BLOCKSIZE ? maximum : BLOCKSIZE;
|
||
if (full_write (STDOUT_FILENO, cursor, count) != count)
|
||
write_error (use_compress_program_option);
|
||
cursor += count;
|
||
maximum -= count;
|
||
}
|
||
}
|
||
|
||
xclose (STDOUT_FILENO);
|
||
|
||
wait_for_grandchild (grandchild_pid);
|
||
}
|
||
|
||
|
||
|
||
static void
|
||
dec_to_env (char const *envar, uintmax_t num)
|
||
{
|
||
char buf[UINTMAX_STRSIZE_BOUND];
|
||
char *numstr;
|
||
|
||
numstr = STRINGIFY_BIGINT (num, buf);
|
||
if (setenv (envar, numstr, 1) != 0)
|
||
xalloc_die ();
|
||
}
|
||
|
||
static void
|
||
time_to_env (char const *envar, struct timespec t)
|
||
{
|
||
char buf[TIMESPEC_STRSIZE_BOUND];
|
||
if (setenv (envar, code_timespec (t, buf), 1) != 0)
|
||
xalloc_die ();
|
||
}
|
||
|
||
static void
|
||
oct_to_env (char const *envar, unsigned long num)
|
||
{
|
||
char buf[1+1+(sizeof(unsigned long)*CHAR_BIT+2)/3];
|
||
|
||
snprintf (buf, sizeof buf, "0%lo", num);
|
||
if (setenv (envar, buf, 1) != 0)
|
||
xalloc_die ();
|
||
}
|
||
|
||
static void
|
||
str_to_env (char const *envar, char const *str)
|
||
{
|
||
if (str)
|
||
{
|
||
if (setenv (envar, str, 1) != 0)
|
||
xalloc_die ();
|
||
}
|
||
else
|
||
unsetenv (envar);
|
||
}
|
||
|
||
static void
|
||
chr_to_env (char const *envar, char c)
|
||
{
|
||
char buf[2];
|
||
buf[0] = c;
|
||
buf[1] = 0;
|
||
if (setenv (envar, buf, 1) != 0)
|
||
xalloc_die ();
|
||
}
|
||
|
||
static void
|
||
stat_to_env (char *name, char type, struct tar_stat_info *st)
|
||
{
|
||
str_to_env ("TAR_VERSION", PACKAGE_VERSION);
|
||
str_to_env ("TAR_ARCHIVE", *archive_name_cursor);
|
||
dec_to_env ("TAR_VOLUME", archive_name_cursor - archive_name_array + 1);
|
||
dec_to_env ("TAR_BLOCKING_FACTOR", blocking_factor);
|
||
str_to_env ("TAR_FORMAT",
|
||
archive_format_string (current_format == DEFAULT_FORMAT ?
|
||
archive_format : current_format));
|
||
chr_to_env ("TAR_FILETYPE", type);
|
||
oct_to_env ("TAR_MODE", st->stat.st_mode);
|
||
str_to_env ("TAR_FILENAME", name);
|
||
str_to_env ("TAR_REALNAME", st->file_name);
|
||
str_to_env ("TAR_UNAME", st->uname);
|
||
str_to_env ("TAR_GNAME", st->gname);
|
||
time_to_env ("TAR_ATIME", st->atime);
|
||
time_to_env ("TAR_MTIME", st->mtime);
|
||
time_to_env ("TAR_CTIME", st->ctime);
|
||
dec_to_env ("TAR_SIZE", st->stat.st_size);
|
||
dec_to_env ("TAR_UID", st->stat.st_uid);
|
||
dec_to_env ("TAR_GID", st->stat.st_gid);
|
||
|
||
switch (type)
|
||
{
|
||
case 'b':
|
||
case 'c':
|
||
dec_to_env ("TAR_MINOR", minor (st->stat.st_rdev));
|
||
dec_to_env ("TAR_MAJOR", major (st->stat.st_rdev));
|
||
unsetenv ("TAR_LINKNAME");
|
||
break;
|
||
|
||
case 'l':
|
||
case 'h':
|
||
unsetenv ("TAR_MINOR");
|
||
unsetenv ("TAR_MAJOR");
|
||
str_to_env ("TAR_LINKNAME", st->link_name);
|
||
break;
|
||
|
||
default:
|
||
unsetenv ("TAR_MINOR");
|
||
unsetenv ("TAR_MAJOR");
|
||
unsetenv ("TAR_LINKNAME");
|
||
break;
|
||
}
|
||
}
|
||
|
||
static pid_t global_pid;
|
||
static void (*pipe_handler) (int sig);
|
||
|
||
int
|
||
sys_exec_command (char *file_name, int typechar, struct tar_stat_info *st)
|
||
{
|
||
int p[2];
|
||
|
||
xpipe (p);
|
||
pipe_handler = signal (SIGPIPE, SIG_IGN);
|
||
global_pid = xfork ();
|
||
|
||
if (global_pid != 0)
|
||
{
|
||
xclose (p[PREAD]);
|
||
return p[PWRITE];
|
||
}
|
||
|
||
/* Child */
|
||
xdup2 (p[PREAD], STDIN_FILENO);
|
||
xclose (p[PWRITE]);
|
||
|
||
stat_to_env (file_name, typechar, st);
|
||
|
||
priv_set_restore_linkdir ();
|
||
xexec (to_command_option);
|
||
}
|
||
|
||
void
|
||
sys_wait_command (void)
|
||
{
|
||
int status;
|
||
|
||
if (global_pid < 0)
|
||
return;
|
||
|
||
signal (SIGPIPE, pipe_handler);
|
||
while (waitpid (global_pid, &status, 0) == -1)
|
||
if (errno != EINTR)
|
||
{
|
||
global_pid = -1;
|
||
waitpid_error (to_command_option);
|
||
return;
|
||
}
|
||
|
||
if (WIFEXITED (status))
|
||
{
|
||
if (!ignore_command_error_option && WEXITSTATUS (status))
|
||
ERROR ((0, 0, _("%lu: Child returned status %d"),
|
||
(unsigned long) global_pid, WEXITSTATUS (status)));
|
||
}
|
||
else if (WIFSIGNALED (status))
|
||
{
|
||
WARN ((0, 0, _("%lu: Child terminated on signal %d"),
|
||
(unsigned long) global_pid, WTERMSIG (status)));
|
||
}
|
||
else
|
||
ERROR ((0, 0, _("%lu: Child terminated on unknown reason"),
|
||
(unsigned long) global_pid));
|
||
|
||
global_pid = -1;
|
||
}
|
||
|
||
int
|
||
sys_exec_info_script (const char **archive_name, int volume_number)
|
||
{
|
||
pid_t pid;
|
||
char uintbuf[UINTMAX_STRSIZE_BOUND];
|
||
int p[2];
|
||
static void (*saved_handler) (int sig);
|
||
|
||
xpipe (p);
|
||
saved_handler = signal (SIGPIPE, SIG_IGN);
|
||
|
||
pid = xfork ();
|
||
|
||
if (pid != 0)
|
||
{
|
||
/* Master */
|
||
|
||
int rc;
|
||
int status;
|
||
char *buf = NULL;
|
||
size_t size = 0;
|
||
FILE *fp;
|
||
|
||
xclose (p[PWRITE]);
|
||
fp = fdopen (p[PREAD], "r");
|
||
rc = getline (&buf, &size, fp);
|
||
fclose (fp);
|
||
|
||
if (rc > 0 && buf[rc-1] == '\n')
|
||
buf[--rc] = 0;
|
||
|
||
while (waitpid (pid, &status, 0) == -1)
|
||
if (errno != EINTR)
|
||
{
|
||
signal (SIGPIPE, saved_handler);
|
||
waitpid_error (info_script_option);
|
||
return -1;
|
||
}
|
||
|
||
signal (SIGPIPE, saved_handler);
|
||
|
||
if (WIFEXITED (status))
|
||
{
|
||
if (WEXITSTATUS (status) == 0 && rc > 0)
|
||
*archive_name = buf;
|
||
else
|
||
free (buf);
|
||
return WEXITSTATUS (status);
|
||
}
|
||
|
||
free (buf);
|
||
return -1;
|
||
}
|
||
|
||
/* Child */
|
||
setenv ("TAR_VERSION", PACKAGE_VERSION, 1);
|
||
setenv ("TAR_ARCHIVE", *archive_name, 1);
|
||
setenv ("TAR_VOLUME", STRINGIFY_BIGINT (volume_number, uintbuf), 1);
|
||
setenv ("TAR_BLOCKING_FACTOR",
|
||
STRINGIFY_BIGINT (blocking_factor, uintbuf), 1);
|
||
setenv ("TAR_SUBCOMMAND", subcommand_string (subcommand_option), 1);
|
||
setenv ("TAR_FORMAT",
|
||
archive_format_string (current_format == DEFAULT_FORMAT ?
|
||
archive_format : current_format), 1);
|
||
setenv ("TAR_FD", STRINGIFY_BIGINT (p[PWRITE], uintbuf), 1);
|
||
|
||
xclose (p[PREAD]);
|
||
|
||
priv_set_restore_linkdir ();
|
||
xexec (info_script_option);
|
||
}
|
||
|
||
void
|
||
sys_exec_checkpoint_script (const char *script_name,
|
||
const char *archive_name,
|
||
int checkpoint_number)
|
||
{
|
||
pid_t pid;
|
||
char uintbuf[UINTMAX_STRSIZE_BOUND];
|
||
|
||
pid = xfork ();
|
||
|
||
if (pid != 0)
|
||
{
|
||
/* Master */
|
||
|
||
int status;
|
||
|
||
while (waitpid (pid, &status, 0) == -1)
|
||
if (errno != EINTR)
|
||
{
|
||
waitpid_error (script_name);
|
||
break;
|
||
}
|
||
|
||
return;
|
||
}
|
||
|
||
/* Child */
|
||
setenv ("TAR_VERSION", PACKAGE_VERSION, 1);
|
||
setenv ("TAR_ARCHIVE", archive_name, 1);
|
||
setenv ("TAR_CHECKPOINT", STRINGIFY_BIGINT (checkpoint_number, uintbuf), 1);
|
||
setenv ("TAR_BLOCKING_FACTOR",
|
||
STRINGIFY_BIGINT (blocking_factor, uintbuf), 1);
|
||
setenv ("TAR_SUBCOMMAND", subcommand_string (subcommand_option), 1);
|
||
setenv ("TAR_FORMAT",
|
||
archive_format_string (current_format == DEFAULT_FORMAT ?
|
||
archive_format : current_format), 1);
|
||
priv_set_restore_linkdir ();
|
||
xexec (script_name);
|
||
}
|
||
|
||
#endif /* not MSDOS */
|