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/* update.c - The routines for updating the file to a consistent state. */
/* This file is part of GDBM, the GNU data base manager.
Copyright (C) 1990-2023 Free Software Foundation, Inc.
GDBM 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, or (at your option)
any later version.
GDBM 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 GDBM. If not, see <http://www.gnu.org/licenses/>. */
/* Include system configuration before all else. */
#include "autoconf.h"
#include "gdbmdefs.h"
/* This procedure writes the header back to the file described by DBF. */
static int
write_header (GDBM_FILE dbf)
{
off_t file_pos; /* Return value for lseek. */
int rc;
file_pos = gdbm_file_seek (dbf, 0L, SEEK_SET);
if (file_pos != 0)
{
GDBM_SET_ERRNO2 (dbf, GDBM_FILE_SEEK_ERROR, TRUE, GDBM_DEBUG_STORE);
_gdbm_fatal (dbf, _("lseek error"));
return -1;
}
rc = _gdbm_full_write (dbf, dbf->header, dbf->header->block_size);
if (rc)
{
GDBM_DEBUG (GDBM_DEBUG_STORE|GDBM_DEBUG_ERR,
"%s: error writing header: %s",
dbf->name, gdbm_db_strerror (dbf));
return -1;
}
/* Sync the file if fast_write is FALSE. */
if (dbf->fast_write == FALSE)
gdbm_file_sync (dbf);
return 0;
}
/* After all changes have been made in memory, we now write them
all to disk. */
int
_gdbm_end_update (GDBM_FILE dbf)
{
off_t file_pos; /* Return value for lseek. */
int rc;
/* Write the changed buckets if there are any. */
_gdbm_cache_flush (dbf);
/* Write the directory. */
if (dbf->directory_changed)
{
file_pos = gdbm_file_seek (dbf, dbf->header->dir, SEEK_SET);
if (file_pos != dbf->header->dir)
{
GDBM_SET_ERRNO2 (dbf, GDBM_FILE_SEEK_ERROR, TRUE, GDBM_DEBUG_STORE);
_gdbm_fatal (dbf, _("lseek error"));
return -1;
}
rc = _gdbm_full_write (dbf, dbf->dir, dbf->header->dir_size);
if (rc)
{
GDBM_DEBUG (GDBM_DEBUG_STORE|GDBM_DEBUG_ERR,
"%s: error writing directory: %s",
dbf->name, gdbm_db_strerror (dbf));
_gdbm_fatal (dbf, gdbm_db_strerror (dbf));
return -1;
}
dbf->directory_changed = FALSE;
if (!dbf->header_changed && dbf->fast_write == FALSE)
gdbm_file_sync (dbf);
}
/* Final write of the header. */
if (dbf->header_changed)
{
if (write_header (dbf))
return -1;
if (_gdbm_file_extend (dbf, dbf->header->next_block))
return -1;
dbf->header_changed = FALSE;
}
return 0;
}
/* For backward compatibility, if the caller defined fatal_err function,
call it upon fatal error and exit. */
void
_gdbm_fatal (GDBM_FILE dbf, const char *val)
{
if (dbf && dbf->fatal_err)
{
(*dbf->fatal_err) (val);
exit (1);
}
}
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