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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, 1991, 1993, 2007, 2011, 2013 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"
static void write_header (GDBM_FILE);
/* This procedure writes the header back to the file described by DBF. */
static void
write_header (GDBM_FILE dbf)
{
off_t file_pos; /* Return value for lseek. */
int rc;
file_pos = __lseek (dbf, 0L, SEEK_SET);
if (file_pos != 0) _gdbm_fatal (dbf, _("lseek error"));
rc = _gdbm_full_write (dbf, dbf->header, dbf->header->block_size);
if (rc)
_gdbm_fatal (dbf, gdbm_strerror (rc));
/* Sync the file if fast_write is FALSE. */
if (dbf->fast_write == FALSE)
__fsync (dbf);
}
/* After all changes have been made in memory, we now write them
all to disk. */
void
_gdbm_end_update (GDBM_FILE dbf)
{
off_t file_pos; /* Return value for lseek. */
int rc;
/* Write the current bucket. */
if (dbf->bucket_changed && (dbf->cache_entry != NULL))
{
_gdbm_write_bucket (dbf, dbf->cache_entry);
dbf->bucket_changed = FALSE;
}
/* Write the other changed buckets if there are any. */
if (dbf->second_changed)
{
if (dbf->bucket_cache != NULL)
{
int index;
for (index = 0; index < dbf->cache_size; index++)
{
if (dbf->bucket_cache[index].ca_changed)
_gdbm_write_bucket (dbf, &dbf->bucket_cache[index]);
}
}
dbf->second_changed = FALSE;
}
/* Write the directory. */
if (dbf->directory_changed)
{
file_pos = __lseek (dbf, dbf->header->dir, SEEK_SET);
if (file_pos != dbf->header->dir) _gdbm_fatal (dbf, _("lseek error"));
rc = _gdbm_full_write (dbf, dbf->dir, dbf->header->dir_size);
if (rc)
_gdbm_fatal (dbf, gdbm_strerror (rc));
dbf->directory_changed = FALSE;
if (!dbf->header_changed && dbf->fast_write == FALSE)
__fsync (dbf);
}
/* Final write of the header. */
if (dbf->header_changed)
{
write_header (dbf);
dbf->header_changed = FALSE;
}
}
/* If a fatal error is detected, come here and exit. VAL tells which fatal
error occured. */
void
_gdbm_fatal (GDBM_FILE dbf, const char *val)
{
if ((dbf != NULL) && (dbf->fatal_err != NULL))
(*dbf->fatal_err) (val);
else
{
fprintf (stderr, _("gdbm fatal: %s\n"), val ? val : "");
}
exit (1);
/* NOTREACHED */
}
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