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.\" gd_flush.3. The gd_flush man page.
.\"
.\" Copyright (C) 2008, 2009, 2010, 2011, 2012, 2014, 2016 D. V. Wiebe
.\"
.\""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""
.\"
.\" This file is part of the GetData project.
.\"
.\" Permission is granted to copy, distribute and/or modify this document
.\" under the terms of the GNU Free Documentation License, Version 1.2 or
.\" any later version published by the Free Software Foundation; with no
.\" Invariant Sections, with no Front-Cover Texts, and with no Back-Cover
.\" Texts. A copy of the license is included in the `COPYING.DOC' file
.\" as part of this distribution.
.\"
.TH gd_flush 3 "25 December 2016" "Version 0.10.0" "GETDATA"
.SH NAME
gd_flush gd_raw_close gd_sync \(em write all pending Dirfile changes to disk or
close open raw fields
.SH SYNOPSIS
.SC
.B #include <getdata.h>
.HP
.HP
.BI "int gd_flush(DIRFILE *" dirfile ", const char *" field_code );
.HP
.BI "int gd_raw_close(DIRFILE *" dirfile ", const char *" field_code );
.HP
.BI "int gd_sync(DIRFILE *" dirfile ", const char *" field_code );
.EC
.SH DESCRIPTION
The
.FN gd_sync
function flushes all pending writes to disk of raw data files associated with
.ARG field_code ,
or its input(s), in the dirfile specified by
.ARG dirfile .
If the
.ARG field_code
contains a valid representation suffix, it will be ignored.
As a special case, if NULL is passed to
.FN gd_sync
as
.ARG field_code ,
all fields in
.ARG dirfile
will be flushed. In this special case, modified metadata will also be flushed
to disk as if
.F3 gd_metaflush
had been called. If the dirfile has been opened read-only, this function does
nothing. Additionally, some encoding schemes may implement this as a NOP.
.PP
The
.FN gd_raw_close
function closes any raw data files which GetData has opened associated with
.ARG field_code ,
or its input(s). Again, if
.ARG field_code
is NULL, all open data files are closed. The I/O pointer of any
.B RAW
field which is closed is reset to the beginning-of-field.
.PP
Calling
.FN gd_flush
is essentially equivalent to calling first
.FN gd_sync
and then
.FN gd_raw_close
(ie. it does both tasks), although, if
.ARG field_code
is NULL, the order of operations if may be different than making the two explicit
calls.
.SH RETURN VALUE
On success, these functions return zero. On error, a negative-valued error
code is returned. Possible error codes are:
.DD GD_E_ALLOC
The library was unable to allocate memory.
.DD GD_E_BAD_CODE
The field specified by
.ARG field_code
was not found in the database.
.DD GD_E_BAD_DIRFILE
The supplied dirfile was invalid.
.DD GD_E_IO
An I/O error occurred while trying to write modified data or metadata to disk.
.DD GD_E_LINE_TOO_LONG
While attempting to flush modified metadata to disk, a field specification line
exceeded the maximum allowed length. On most platforms, the maximum length is
at least 2**31 bytes, so this typically indicates something pathological
happening.
.DD GD_E_RECURSE_LEVEL
Too many levels of recursion were encountered while trying to resolve
.ARG field_code .
This usually indicates a circular dependency in field specification in the
dirfile.
.PP
The error code is also stored in the
.B DIRFILE
object and may be retrieved after this function returns by calling
.F3 gd_error .
A descriptive error string for the error may be obtained by calling
.F3 gd_error_string .
.SH HISTORY
The
.FN dirfile_flush
function appeared in GetData-0.3.0.
In GetData-0.7.0, this function was renamed to
.FN gd_flush .
The
.FN gd_raw_close
and
.FN gd_sync
functions appeared in GetData-0.8.0.
In GetData-0.10.0, the error return from these functions changed from -1 to a
negative-valued error code.
.SH SEE ALSO
.F3 gd_close ,
.F3 gd_dirfile_standards ,
.F3 gd_error ,
.F3 gd_error_string ,
.F3 gd_metaflush ,
.F3 gd_open
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