/***
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*
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* rtcfg/rtcfg_file.c
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*
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* Real-Time Configuration Distribution Protocol
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*
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* Copyright (C) 2004 Jan Kiszka <jan.kiszka@web.de>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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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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*
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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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*/
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#include <linux/init.h>
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#include <rtdm/driver.h>
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#include <rtcfg_chrdev.h>
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#include <rtcfg/rtcfg.h>
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#include <rtcfg/rtcfg_file.h>
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/* Note:
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* We don't need any special lock protection while manipulating the
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* rtcfg_files list. The list is only accessed through valid connections, and
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* connections are already lock-protected.
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*/
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LIST_HEAD(rtcfg_files);
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struct rtcfg_file *rtcfg_get_file(const char *filename)
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{
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struct list_head *entry;
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struct rtcfg_file *file;
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RTCFG_DEBUG(4, "RTcfg: looking for file %s\n", filename);
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list_for_each (entry, &rtcfg_files) {
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file = list_entry(entry, struct rtcfg_file, entry);
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if (strcmp(file->name, filename) == 0) {
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file->ref_count++;
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RTCFG_DEBUG(4,
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"RTcfg: reusing file entry, now %d users\n",
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file->ref_count);
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return file;
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}
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}
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return NULL;
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}
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void rtcfg_add_file(struct rtcfg_file *file)
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{
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RTCFG_DEBUG(4, "RTcfg: adding file %s to list\n", file->name);
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file->ref_count = 1;
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list_add_tail(&file->entry, &rtcfg_files);
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}
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int rtcfg_release_file(struct rtcfg_file *file)
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{
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if (--file->ref_count == 0) {
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RTCFG_DEBUG(4, "RTcfg: removing file %s from list\n",
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file->name);
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list_del(&file->entry);
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}
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return file->ref_count;
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}
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