-/* PSPP - computes sample statistics.
+/* PSPP - a program for statistical analysis.
Copyright (C) 2004 Free Software Foundation, Inc.
- This program is free software; you can redistribute it and/or
- modify it under the terms of the GNU General Public License as
- published by the Free Software Foundation; either version 2 of the
- License, or (at your option) any later version.
+ This program is free software: you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation, either version 3 of the License, or
+ (at your option) any later version.
- This program is distributed in the hope that it will be useful, but
- WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- General Public License for more details.
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
You should have received a copy of the GNU General Public License
- along with this program; if not, write to the Free Software
- Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
- 02110-1301, USA. */
+ along with this program. If not, see <http://www.gnu.org/licenses/>. */
#include <config.h>
#include <assert.h>
+#include <fcntl.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <stdio.h>
-#include "file-name.h"
-#include "make-file.h"
+#include <sys/stat.h>
+
+#include <data/file-name.h>
+#include <data/make-file.h>
+#include <libpspp/ll.h>
#include <libpspp/message.h>
-#include <libpspp/alloc.h>
+
+#include "fatal-signal.h"
+#include "tempname.h"
+#include "xalloc.h"
#include "gettext.h"
#define _(msgid) gettext (msgid)
const char *parent_dir;
- /* FIXME:
+ /* FIXME:
Need to check for pre-existing file name.
- Need also to pass in the directory instead of using /tmp
+ Need also to pass in the directory instead of using /tmp
*/
assert (file_name != NULL);
return 1;
}
+\f
+struct replace_file
+ {
+ struct ll ll;
+ char *file_name;
+ char *tmp_name;
+ };
+
+static struct ll_list all_files = LL_INITIALIZER (all_files);
+
+static void free_replace_file (struct replace_file *);
+static void unlink_replace_files (void);
+
+struct replace_file *
+replace_file_start (const char *file_name, const char *mode,
+ mode_t permissions, FILE **fp, char **tmp_name)
+{
+ static bool registered;
+ struct stat s;
+ struct replace_file *rf;
+ int fd;
+
+ /* If FILE_NAME represents a special file, write to it directly
+ instead of trying to replace it. */
+ if (stat (file_name, &s) == 0 && !S_ISREG (s.st_mode))
+ {
+ /* Open file descriptor. */
+ fd = open (file_name, O_WRONLY);
+ if (fd < 0)
+ {
+ msg (ME, _("Opening %s for writing: %s."),
+ file_name, strerror (errno));
+ return NULL;
+ }
+
+ /* Open file as stream. */
+ *fp = fdopen (fd, mode);
+ if (*fp == NULL)
+ {
+ msg (ME, _("Opening stream for %s: %s."),
+ file_name, strerror (errno));
+ close (fd);
+ return NULL;
+ }
+
+ rf = xmalloc (sizeof *rf);
+ rf->file_name = NULL;
+ rf->tmp_name = xstrdup (file_name);
+ if (tmp_name != NULL)
+ *tmp_name = rf->tmp_name;
+ return rf;
+ }
+
+ if (!registered)
+ {
+ at_fatal_signal (unlink_replace_files);
+ registered = true;
+ }
+ block_fatal_signals ();
+
+ rf = xmalloc (sizeof *rf);
+ rf->file_name = xstrdup (file_name);
+ for (;;)
+ {
+ /* Generate unique temporary file name. */
+ rf->tmp_name = xasprintf ("%s.tmpXXXXXX", file_name);
+ if (gen_tempname (rf->tmp_name, 0600, GT_NOCREATE) < 0)
+ {
+ msg (ME, _("Creating temporary file to replace %s: %s."),
+ rf->file_name, strerror (errno));
+ goto error;
+ }
+
+ /* Create file by that name. */
+ fd = open (rf->tmp_name, O_WRONLY | O_CREAT | O_EXCL | O_BINARY, permissions);
+ if (fd >= 0)
+ break;
+ if (errno != EEXIST)
+ {
+ msg (ME, _("Creating temporary file %s: %s."),
+ rf->tmp_name, strerror (errno));
+ goto error;
+ }
+ free (rf->tmp_name);
+ }
+
+
+ /* Open file as stream. */
+ *fp = fdopen (fd, mode);
+ if (*fp == NULL)
+ {
+ msg (ME, _("Opening stream for temporary file %s: %s."),
+ rf->tmp_name, strerror (errno));
+ close (fd);
+ unlink (rf->tmp_name);
+ goto error;
+ }
+
+ /* Register file for deletion. */
+ ll_push_head (&all_files, &rf->ll);
+ unblock_fatal_signals ();
+
+ if (tmp_name != NULL)
+ *tmp_name = rf->tmp_name;
+
+ return rf;
+
+error:
+ unblock_fatal_signals ();
+ free_replace_file (rf);
+ *fp = NULL;
+ if (tmp_name != NULL)
+ *tmp_name = NULL;
+ return NULL;
+}
+
+bool
+replace_file_commit (struct replace_file *rf)
+{
+ bool ok = true;
+
+ if (rf->file_name != NULL)
+ {
+ int save_errno;
+
+ block_fatal_signals ();
+ ok = rename (rf->tmp_name, rf->file_name) == 0;
+ save_errno = errno;
+ ll_remove (&rf->ll);
+ unblock_fatal_signals ();
+
+ if (!ok)
+ msg (ME, _("Replacing %s by %s: %s."),
+ rf->tmp_name, rf->file_name, strerror (save_errno));
+ }
+ else
+ {
+ /* Special file: no temporary file to rename. */
+ }
+ free_replace_file (rf);
+
+ return ok;
+}
+
+bool
+replace_file_abort (struct replace_file *rf)
+{
+ bool ok = true;
+
+ if (rf->file_name != NULL)
+ {
+ int save_errno;
+
+ block_fatal_signals ();
+ ok = unlink (rf->tmp_name) == 0;
+ save_errno = errno;
+ ll_remove (&rf->ll);
+ unblock_fatal_signals ();
+
+ if (!ok)
+ msg (ME, _("Removing %s: %s."), rf->tmp_name, strerror (save_errno));
+ }
+ else
+ {
+ /* Special file: no temporary file to unlink. */
+ }
+ free_replace_file (rf);
+ return ok;
+}
+static void
+free_replace_file (struct replace_file *rf)
+{
+ free (rf->file_name);
+ free (rf->tmp_name);
+ free (rf);
+}
+static void
+unlink_replace_files (void)
+{
+ struct replace_file *rf;
+ block_fatal_signals ();
+ ll_for_each (rf, struct replace_file, ll, &all_files)
+ {
+ /* We don't free_replace_file(RF) because calling free is unsafe
+ from an asynchronous signal handler. */
+ unlink (rf->tmp_name);
+ fflush (stdout);
+ }
+ unblock_fatal_signals ();
+}
projects / pspp-builds.git / blobdiff