d37bb17566
lumiera_error_set() now takes an optional extra string which can be used to pass context relevant data along. This string gets copied into the error state so one can easily create it by the tmpbuf_snprintf() facility. Also a lot of places which define errors get fixed according to this.
108 lines
2.8 KiB
C
108 lines
2.8 KiB
C
/*
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filehandle - filehandle management and caching
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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/llist.h"
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#include "lib/safeclib.h"
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#include "backend/file.h"
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#include "backend/filehandle.h"
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#include "backend/filedescriptor.h"
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#include <unistd.h>
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LumieraFilehandle
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lumiera_filehandle_init (LumieraFilehandle self, LumieraFiledescriptor desc)
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{
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TRACE (filehandle, "%p", self);
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if (self)
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{
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llist_init (&self->cachenode);
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self->fd = -1;
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self->use_cnt = 1;
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self->descriptor = desc;
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}
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return self;
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}
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LumieraFilehandle
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lumiera_filehandle_new (LumieraFiledescriptor desc)
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{
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LumieraFilehandle self = lumiera_malloc (sizeof (*self));
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return lumiera_filehandle_init (self, desc);
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}
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void*
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lumiera_filehandle_destroy_node (LList node)
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{
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TRACE (filehandle);
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REQUIRE (llist_is_empty (node));
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LumieraFilehandle self = (LumieraFilehandle)node;
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REQUIRE (self->use_cnt == 0);
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if (self->fd >= 0)
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close (self->fd);
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return self;
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}
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int
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lumiera_filehandle_get (LumieraFilehandle self)
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{
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REQUIRE (self->descriptor);
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return -1;
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}
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int
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lumiera_filehandle_handle (LumieraFilehandle self)
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{
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TRACE (filehandle);
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int fd = -1;
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if (self->fd == -1)
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{
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fd = open (lumiera_filedescriptor_name (self->descriptor), lumiera_filedescriptor_flags (self->descriptor) & LUMIERA_FILE_MASK);
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if (fd == -1)
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{
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LUMIERA_ERROR_SET (filehandle, ERRNO, lumiera_filedescriptor_name (self->descriptor));
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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 (filehandle, ERRNO, lumiera_filedescriptor_name (self->descriptor));
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}
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else if (!lumiera_filedescriptor_samestat (self->descriptor, &st))
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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 (filehandle, FILE_CHANGED, lumiera_filedescriptor_name (self->descriptor));
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}
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}
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self->fd = fd;
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}
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return self->fd;
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}
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