Adding upstream version 9.4.upstream/9.4upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 234 insertions, 0 deletions

diff --git a/src/sync.c b/src/sync.c
new file mode 100644
index 0000000..22337bc
--- /dev/null
+++ b/src/sync.c
@@ -0,0 +1,234 @@
+/* sync - update the super block
+   Copyright (C) 1994-2023 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 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.
+
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
+
+/* Written by Jim Meyering */
+
+#include <config.h>
+#include <getopt.h>
+#include <stdio.h>
+#include <sys/types.h>
+
+#include "system.h"
+
+/* The official name of this program (e.g., no 'g' prefix).  */
+#define PROGRAM_NAME "sync"
+
+#define AUTHORS                                 \
+  proper_name ("Jim Meyering"),                 \
+  proper_name ("Giuseppe Scrivano")
+
+#ifndef HAVE_SYNCFS
+# define HAVE_SYNCFS 0
+#endif
+
+enum sync_mode
+{
+  MODE_FILE,
+  MODE_DATA,
+  MODE_FILE_SYSTEM,
+  MODE_SYNC
+};
+
+static struct option const long_options[] =
+{
+  {"data", no_argument, nullptr, 'd'},
+  {"file-system", no_argument, nullptr, 'f'},
+  {GETOPT_HELP_OPTION_DECL},
+  {GETOPT_VERSION_OPTION_DECL},
+  {nullptr, 0, nullptr, 0}
+};
+
+void
+usage (int status)
+{
+  if (status != EXIT_SUCCESS)
+    emit_try_help ();
+  else
+    {
+      printf (_("Usage: %s [OPTION] [FILE]...\n"), program_name);
+      fputs (_("\
+Synchronize cached writes to persistent storage\n\
+\n\
+If one or more files are specified, sync only them,\n\
+or their containing file systems.\n\
+\n\
+"), stdout);
+
+      fputs (_("\
+  -d, --data             sync only file data, no unneeded metadata\n\
+"), stdout);
+      fputs (_("\
+  -f, --file-system      sync the file systems that contain the files\n\
+"), stdout);
+
+      fputs (HELP_OPTION_DESCRIPTION, stdout);
+      fputs (VERSION_OPTION_DESCRIPTION, stdout);
+      emit_ancillary_info (PROGRAM_NAME);
+    }
+  exit (status);
+}
+
+/* Sync the specified FILE, or file systems associated with FILE.
+   Return 1 on success.  */
+
+static bool
+sync_arg (enum sync_mode mode, char const *file)
+{
+  bool ret = true;
+  int open_flags = O_RDONLY | O_NONBLOCK;
+  int fd;
+
+#if defined _AIX || defined __CYGWIN__
+  /* AIX 7.1, CYGWIN 2.9.0, fsync requires write access to file.  */
+  if (mode == MODE_FILE)
+    open_flags = O_WRONLY | O_NONBLOCK;
+#endif
+
+  /* Note O_PATH might be supported with syncfs(),
+     though as of Linux 3.18 is not.  */
+  fd = open (file, open_flags);
+  if (fd < 0)
+    {
+      /* Use the O_RDONLY errno, which is significant
+         with directories for example.  */
+      int rd_errno = errno;
+      if (open_flags != (O_WRONLY | O_NONBLOCK))
+        fd = open (file, O_WRONLY | O_NONBLOCK);
+      if (fd < 0)
+        {
+          error (0, rd_errno, _("error opening %s"), quoteaf (file));
+          return false;
+        }
+    }
+
+  /* We used O_NONBLOCK above to not hang with fifos,
+     so reset that here.  */
+  int fdflags = fcntl (fd, F_GETFL);
+  if (fdflags == -1
+      || fcntl (fd, F_SETFL, fdflags & ~O_NONBLOCK) < 0)
+    {
+      error (0, errno, _("couldn't reset non-blocking mode %s"),
+             quoteaf (file));
+      ret = false;
+    }
+
+  if (ret == true)
+    {
+      int sync_status = -1;
+
+      switch (mode)
+        {
+        case MODE_DATA:
+          sync_status = fdatasync (fd);
+          break;
+
+        case MODE_FILE:
+          sync_status = fsync (fd);
+          break;
+
+#if HAVE_SYNCFS
+        case MODE_FILE_SYSTEM:
+          sync_status = syncfs (fd);
+          break;
+#endif
+
+        default:
+          unreachable ();
+        }
+
+      if (sync_status < 0)
+        {
+          error (0, errno, _("error syncing %s"), quoteaf (file));
+          ret = false;
+        }
+    }
+
+  if (close (fd) < 0)
+    {
+      error (0, errno, _("failed to close %s"), quoteaf (file));
+      ret = false;
+    }
+
+  return ret;
+}
+
+int
+main (int argc, char **argv)
+{
+  int c;
+  bool args_specified;
+  bool arg_data = false, arg_file_system = false;
+  enum sync_mode mode;
+  bool ok = true;
+
+  initialize_main (&argc, &argv);
+  set_program_name (argv[0]);
+  setlocale (LC_ALL, "");
+  bindtextdomain (PACKAGE, LOCALEDIR);
+  textdomain (PACKAGE);
+
+  atexit (close_stdout);
+
+  while ((c = getopt_long (argc, argv, "df", long_options, nullptr))
+         != -1)
+    {
+      switch (c)
+        {
+        case 'd':
+          arg_data = true;
+          break;
+
+        case 'f':
+          arg_file_system = true;
+          break;
+
+        case_GETOPT_HELP_CHAR;
+
+        case_GETOPT_VERSION_CHAR (PROGRAM_NAME, AUTHORS);
+
+        default:
+          usage (EXIT_FAILURE);
+        }
+    }
+
+  args_specified = optind < argc;
+
+  if (arg_data && arg_file_system)
+    error (EXIT_FAILURE, 0,
+           _("cannot specify both --data and --file-system"));
+
+  if (!args_specified && arg_data)
+    error (EXIT_FAILURE, 0, _("--data needs at least one argument"));
+
+  if (! args_specified || (arg_file_system && ! HAVE_SYNCFS))
+    mode = MODE_SYNC;
+  else if (arg_file_system)
+    mode = MODE_FILE_SYSTEM;
+  else if (! arg_data)
+    mode = MODE_FILE;
+  else
+    mode = MODE_DATA;
+
+  if (mode == MODE_SYNC)
+    sync ();
+  else
+    {
+      for (; optind < argc; optind++)
+        ok &= sync_arg (mode, argv[optind]);
+    }
+
+  return ok ? EXIT_SUCCESS : EXIT_FAILURE;
+}