xapian-core/common/replicate_utils.cc

   1 /** @file replicate_utils.cc
   2  * @brief Utility functions for replication implementations
   3  */
   4 /* Copyright (C) 2010 Richard Boulton
   5  * Copyright (C) 2010 Olly Betts
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 2 of the License, or
  10  * (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
  20  */
  21
  22 #include <config.h>
  23
  24 #include "replicate_utils.h"
  25
  26 #include "xapian/error.h"
  27
  28 #include "io_utils.h"
  29 #include "posixy_wrapper.h"
  30
  31 #include "safeerrno.h"
  32 #include "safefcntl.h"
  33 #include "safesysstat.h"
  34 #include "safeunistd.h"
  35
  36 #include <sys/types.h>
  37
  38 #include <string>
  39
  40 using namespace std;
  41
  42 int
  43 create_changeset_file(const string & changeset_dir,
  44                       const string & filename,
  45                       string & changes_name)
  46 {
  47     changes_name = changeset_dir;
  48     changes_name += '/';
  49     changes_name += filename;
  50     int changes_fd = posixy_open(changes_name.c_str(), O_WRONLY | O_CREAT | O_TRUNC | O_CLOEXEC, 0666);
  51     if (changes_fd < 0) {
  52         string message("Couldn't open changeset to write: ");
  53         message += changes_name;
  54         throw Xapian::DatabaseError(message, errno);
  55     }
  56     return changes_fd;
  57 }
  58
  59 void
  60 write_and_clear_changes(int changes_fd, string & buf, size_t bytes)
  61 {
  62     if (changes_fd != -1) {
  63         io_write(changes_fd, buf.data(), bytes);
  64     }
  65     buf.erase(0, bytes);
  66 }