96 lines
3.5 KiB
Plaintext
96 lines
3.5 KiB
Plaintext
/*
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* $Id: fcatomic.fncs,v 1.2 2009/04/05 16:43:35 matthieu Exp $
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*
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* Copyright © 2003 Keith Packard
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*
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* Permission to use, copy, modify, distribute, and sell this software and its
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* documentation for any purpose is hereby granted without fee, provided that
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* the above copyright notice appear in all copies and that both that
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* copyright notice and this permission notice appear in supporting
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* documentation, and that the name of Keith Packard not be used in
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* advertising or publicity pertaining to distribution of the software without
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* specific, written prior permission. Keith Packard makes no
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* representations about the suitability of this software for any purpose. It
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* is provided "as is" without express or implied warranty.
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*
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* KEITH PACKARD DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
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* INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
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* EVENT SHALL KEITH PACKARD BE LIABLE FOR ANY SPECIAL, INDIRECT OR
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* CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
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* DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
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* TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
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* PERFORMANCE OF THIS SOFTWARE.
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*/
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@RET@ FcAtomic *
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@FUNC@ FcAtomicCreate
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@TYPE1@ const FcChar8 * @ARG1@ file
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@PURPOSE@ create an FcAtomic object
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@DESC@
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Creates a data structure containing data needed to control access to <parameter>file</parameter>.
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Writing is done to a separate file. Once that file is complete, the original
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configuration file is atomically replaced so that reading process always see
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a consistent and complete file without the need to lock for reading.
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@@
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@RET@ FcBool
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@FUNC@ FcAtomicLock
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@TYPE1@ FcAtomic * @ARG1@ atomic
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@PURPOSE@ lock a file
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@DESC@
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Attempts to lock the file referenced by <parameter>atomic</parameter>.
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Returns FcFalse if the file is already locked, else returns FcTrue and
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leaves the file locked.
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@@
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@RET@ FcChar8 *
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@FUNC@ FcAtomicNewFile
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@TYPE1@ FcAtomic * @ARG1@ atomic
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@PURPOSE@ return new temporary file name
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@DESC@
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Returns the filename for writing a new version of the file referenced
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by <parameter>atomic</parameter>.
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@@
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@RET@ FcChar8 *
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@FUNC@ FcAtomicOrigFile
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@TYPE1@ FcAtomic * @ARG1@ atomic
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@PURPOSE@ return original file name
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@DESC@
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Returns the file refernced by <parameter>atomic</parameter>.
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@@
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@RET@ FcBool
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@FUNC@ FcAtomicReplaceOrig
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@TYPE1@ FcAtomic * @ARG1@ atomic
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@PURPOSE@ replace original with new
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@DESC@
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Replaces the original file referenced by <parameter>atomic</parameter> with
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the new file. Returns FcFalse if the file cannot be replaced due to
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permission issues in the filesystem. Otherwise returns FcTrue.
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@@
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@RET@ void
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@FUNC@ FcAtomicDeleteNew
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@TYPE1@ FcAtomic * @ARG1@ atomic
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@PURPOSE@ delete new file
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@DESC@
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Deletes the new file. Used in error recovery to back out changes.
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@@
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@RET@ void
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@FUNC@ FcAtomicUnlock
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@TYPE1@ FcAtomic * @ARG1@ atomic
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@PURPOSE@ unlock a file
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@DESC@
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Unlocks the file.
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@@
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@RET@ void
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@FUNC@ FcAtomicDestroy
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@TYPE1@ FcAtomic * @ARG1@ atomic
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@PURPOSE@ destroy an FcAtomic object
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@DESC@
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Destroys <parameter>atomic</parameter>.
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@@
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