130 lines
3.3 KiB
C
130 lines
3.3 KiB
C
/*
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file.c - file handling
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Copyright (C) Lumiera.org
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2008, Christian Thaeter <ct@pipapo.org>
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include "lib/mutex.h"
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#include "lib/safeclib.h"
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#include "backend/file.h"
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#include "backend/filehandlecache.h"
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#include "backend/filedescriptor.h"
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#include <limits.h>
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#include <unistd.h>
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NOBUG_DEFINE_FLAG_PARENT (file, file_all);
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LUMIERA_ERROR_DEFINE(FILE_CHANGED, "File changed unexpected");
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LumieraFile
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lumiera_file_init (LumieraFile self, const char* name, int flags)
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{
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TRACE (file);
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if (!(self->descriptor = lumiera_filedescriptor_acquire (name, flags)))
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return NULL;
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self->name = lumiera_strndup (name, PATH_MAX);
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return self;
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}
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LumieraFile
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lumiera_file_destroy (LumieraFile self)
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{
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TRACE (file);
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lumiera_filedescriptor_release (self->descriptor);
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lumiera_free (self->name);
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return self;
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}
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LumieraFile
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lumiera_file_new (const char* name, int flags)
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{
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TRACE (file);
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LumieraFile self = lumiera_malloc (sizeof (lumiera_file));
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return lumiera_file_init (self, name, flags);
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}
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void
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lumiera_file_delete (LumieraFile self)
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{
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TRACE (file);
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lumiera_free (lumiera_file_destroy (self));
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}
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int
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lumiera_file_handle_acquire (LumieraFile self)
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{
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TRACE (file);
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REQUIRE (self);
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REQUIRE (self->descriptor);
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REQUIRE (lumiera_fhcache);
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LUMIERA_MUTEX_SECTION (file, &self->descriptor->lock)
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{
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if (!self->descriptor->handle)
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/* no handle yet, get a new one */
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lumiera_filehandlecache_handle_acquire (lumiera_fhcache, self->descriptor);
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else
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lumiera_filehandlecache_checkout (lumiera_fhcache, self->descriptor->handle);
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if (self->descriptor->handle->fd == -1)
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{
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int fd;
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fd = open (self->name, self->descriptor->flags & LUMIERA_FILE_MASK);
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if (fd == -1)
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{
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LUMIERA_ERROR_SET (file, ERRNO);
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}
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else
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{
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struct stat st;
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if (fstat (fd, &st) == -1)
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{
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close (fd);
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LUMIERA_ERROR_SET (file, ERRNO);
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}
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else if (self->descriptor->stat.st_dev != st.st_dev || self->descriptor->stat.st_ino != st.st_ino)
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{
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close (fd);
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/* Woops this is not the file we expected to use */
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LUMIERA_ERROR_SET (file, FILE_CHANGED);
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}
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}
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self->descriptor->handle->fd = fd;
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}
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}
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return self->descriptor->handle->fd;
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}
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void
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lumiera_file_handle_release (LumieraFile self)
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{
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TRACE (file);
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LUMIERA_MUTEX_SECTION (file, &self->descriptor->lock)
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{
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lumiera_filehandlecache_checkin (lumiera_fhcache, self->descriptor->handle);
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}
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}
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