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This function depends on genrand.c, which depends on lib/crypto. This way the other IDR tree code can be used without lib/crypto. While doing this, create idtree.h and idtree_random.h and clean up the includes. Signed-off-by: Martin Schwenke <martin@meltin.net> Reviewed-by: Volker Lendecke <vl@samba.org>
69 lines
2.1 KiB
C
69 lines
2.1 KiB
C
/*
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Unix SMB/CIFS implementation.
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very efficient functions to manage mapping a id (such as a fnum) to
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a pointer. This is used for fnum and search id allocation.
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Copyright (C) Andrew Tridgell 2004
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This code is derived from lib/idr.c in the 2.6 Linux kernel, which was
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written by Jim Houston jim.houston@ccur.com, and is
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Copyright (C) 2002 by Concurrent Computer Corporation
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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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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, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef _SAMBA_IDTREE_H_
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#define _SAMBA_IDTREE_H_
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#include <talloc.h>
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struct idr_context;
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/**
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initialise a idr tree. The context return value must be passed to
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all subsequent idr calls. To destroy the idr tree use talloc_free()
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on this context
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*/
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struct idr_context *idr_init(TALLOC_CTX *mem_ctx);
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/**
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allocate the next available id, and assign 'ptr' into its slot.
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you can retrieve later this pointer using idr_find()
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*/
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int idr_get_new(struct idr_context *idp, void *ptr, int limit);
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/**
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allocate a new id, giving the first available value greater than or
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equal to the given starting id
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*/
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int idr_get_new_above(struct idr_context *idp, void *ptr, int starting_id, int limit);
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/**
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allocate a new id randomly in the given range
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*/
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int idr_get_new_random(struct idr_context *idp, void *ptr, int limit);
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/**
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find a pointer value previously set with idr_get_new given an id
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*/
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void *idr_find(struct idr_context *idp, int id);
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/**
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remove an id from the idr tree
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*/
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int idr_remove(struct idr_context *idp, int id);
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#endif /* _SAMBA_IDTREE_H_ */
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