73f057be6f
It's a used by codec/plugin loading and vastly reduces code duplication. It's also a step forward in getting rid of libuisimulator in the application ports. git-svn-id: svn://svn.rockbox.org/rockbox/trunk@27900 a1c6a512-1295-4272-9138-f99709370657
118 lines
3.4 KiB
C
118 lines
3.4 KiB
C
/***************************************************************************
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* __________ __ ___.
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* Open \______ \ ____ ____ | | _\_ |__ _______ ___
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* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
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* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
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* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
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* \/ \/ \/ \/ \/
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* $Id$
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*
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* Copyright (C) 2010 by Thomas Martitz
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*
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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
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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****************************************************************************/
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#include "plugin.h"
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#include <setjmp.h>
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PLUGIN_HEADER
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/*
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* EXIT_MAGIC magic, because 0 cannot be used due to setjmp()
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* must be > 0
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*/
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#define EXIT_MAGIC 0x0CDEBABE
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extern enum plugin_status plugin_start(const void*);
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extern unsigned char plugin_bss_start[];
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extern unsigned char plugin_end_addr[];
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static jmp_buf __exit_env;
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/* only 1 atexit handler for now, chain in the exit handler if you need more */
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static void (*atexit_handler)(void);
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int rb_atexit(void (*fn)(void))
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{
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if (atexit_handler)
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return -1;
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atexit_handler = fn;
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return 0;
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}
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void exit(int status)
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{ /* jump back in time to before starting the plugin */
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longjmp(__exit_env, status != 0 ? status : EXIT_MAGIC);
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}
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void _exit(int status)
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{ /* don't call exit handler */
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atexit_handler = NULL;
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exit(status);
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}
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enum plugin_status plugin__start(const void *param)
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{
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int exit_ret;
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enum plugin_status ret;
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/* zero out the bss section */
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#if (CONFIG_PLATFORM & PLATFORM_NATIVE)
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rb->memset(plugin_bss_start, 0, plugin_end_addr - plugin_bss_start);
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#endif
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/* we come back here if exit() was called or the plugin returned normally */
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exit_ret = setjmp(__exit_env);
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if (exit_ret == 0)
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{ /* start the plugin */
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ret = plugin_start(param);
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}
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else
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{ /* plugin exit via exit() */
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if (exit_ret == EXIT_MAGIC)
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{ /* exit(EXIT_SUCCESS) */
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ret = PLUGIN_OK;
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}
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else if (exit_ret < INTERNAL_PLUGIN_RETVAL_START)
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{ /* exit(EXIT_FAILURE) */
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ret = PLUGIN_ERROR;
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}
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else
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{ /* exit(PLUGIN_XXX) */
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ret = (enum plugin_status)exit_ret;
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}
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}
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/* before finishing, call the exit handler if there was one */
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if (atexit_handler != NULL)
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atexit_handler();
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return ret;
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}
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static void cleanup_wrapper(void *param)
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{
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(void)param;
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if (atexit_handler)
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atexit_handler();
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}
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void exit_on_usb(int button)
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{ /* the default handler will call the exit handler before
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* showing the usb screen; after that we don't want the exit handler
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* to be called a second time, hence _exit()
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*
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* if not usb, then the handler will only be called if powering off
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* if poweroff, the plugin doesn't want to run any further so exit as well*/
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long result = rb->default_event_handler_ex(button, cleanup_wrapper, NULL);
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if (result == SYS_USB_CONNECTED)
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_exit(PLUGIN_USB_CONNECTED);
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else if (result == SYS_POWEROFF)
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_exit(PLUGIN_POWEROFF);
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}
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