65 lines
1.9 KiB
C
65 lines
1.9 KiB
C
/* handler.c - grub handler function */
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/*
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* GRUB -- GRand Unified Bootloader
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* Copyright (C) 2009 Free Software Foundation, Inc.
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*
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* GRUB 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 3 of the License, or
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* (at your option) any later version.
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*
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* GRUB 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 GRUB. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <grub/handler.h>
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grub_handler_class_t grub_handler_class_list;
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void
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grub_handler_register (grub_handler_class_t class, grub_handler_t handler)
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{
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int first_handler = (class->handler_list == 0);
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grub_list_push (GRUB_AS_LIST_P (&class->handler_list),
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GRUB_AS_LIST (handler));
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if (first_handler)
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{
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grub_list_push (GRUB_AS_LIST_P (&grub_handler_class_list),
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GRUB_AS_LIST (class));
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grub_handler_set_current (class, handler);
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}
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}
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void
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grub_handler_unregister (grub_handler_class_t class, grub_handler_t handler)
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{
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grub_list_remove (GRUB_AS_LIST_P (&class->handler_list),
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GRUB_AS_LIST (handler));
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if (class->handler_list == 0)
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grub_list_remove (GRUB_AS_LIST_P (&grub_handler_class_list),
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GRUB_AS_LIST (class));
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}
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grub_err_t
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grub_handler_set_current (grub_handler_class_t class, grub_handler_t handler)
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{
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if (class->cur_handler && class->cur_handler->fini)
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if ((class->cur_handler->fini) () != GRUB_ERR_NONE)
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return grub_errno;
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if (handler->init)
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if ((handler->init) () != GRUB_ERR_NONE)
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return grub_errno;
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class->cur_handler = handler;
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return GRUB_ERR_NONE;
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}
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