X-Git-Url: https://git.distorted.org.uk/u/mdw/catacomb/blobdiff_plain/ba6e6b64033b1f9de49feccb5c9cd438354481f7..0f00dc4c8eb47e67bc0f148c2dd109f73a451e0a:/lmem.h

diff --git a/lmem.h b/lmem.h
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-/* -*-c-*-
- *
- * $Id: lmem.h,v 1.5 2004/04/08 01:36:15 mdw Exp $
- *
- * Locked memory allocation
- *
- * (c) 1999 Straylight/Edgeware
- */
-
-/*----- Licensing notice --------------------------------------------------*
- *
- * This file is part of Catacomb.
- *
- * Catacomb is free software; you can redistribute it and/or modify
- * it under the terms of the GNU Library General Public License as
- * published by the Free Software Foundation; either version 2 of the
- * License, or (at your option) any later version.
- *
- * Catacomb is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU Library General Public License for more details.
- *
- * You should have received a copy of the GNU Library General Public
- * License along with Catacomb; if not, write to the Free
- * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
- * MA 02111-1307, USA.
- */
-
-#ifndef CATACOMB_LMEM_H
-#define CATACOMB_LMEM_H
-
-#ifdef __cplusplus
-  extern "C" {
-#endif
-
-/*----- Header files ------------------------------------------------------*/
-
-#include <stddef.h>
-
-#include <mLib/arena.h>
-#include <mLib/dstr.h>
-
-/*----- Data structures ---------------------------------------------------*/
-
-/* --- Block list --- *
- *
- * The block list is kept in normal memory, to avoid wasting precious locked
- * memory.  Entries are sorted into ascending address order to make
- * coalescing free blocks easier.  All blocks, free or not, are included in
- * the list.
- */
-
-typedef struct l_node {
-  struct l_node *next;			/* Next free block in chain */
-  char *p;				/* Pointer to the block */
-  size_t sz;				/* Size of the block */
-  unsigned f;				/* Various flags */
-} l_node;
-
-#define LF_ALLOC 1u
-
-/* --- Locked memory buffer state --- */
-
-typedef struct lmem {
-  arena a;				/* Arena header block */
-  unsigned f;				/* Various flags */
-  char *p;				/* Pointer to locked buffer */
-  l_node *l;				/* Pointer to block list */
-  size_t sz;				/* Size of locked buffer */
-  size_t free;				/* Size of free area */
-  int err; char *emsg;			/* Error indicators */
-} lmem;
-
-#define LF_LOCKED 1u
-
-/*----- Functions provided ------------------------------------------------*/
-
-/* --- @l_init@ --- *
- *
- * Arguments:	@lmem *lm@ = pointer to locked memory descriptor
- *		@size_t sz@ = size of locked memory area requested
- *
- * Returns:	Zero if everything is fine, @+1@ if some insecure memory was
- *		allocated, and @-1@ if everything went horribly wrong.
- *
- * Use:		Initializes the locked memory manager.  This function is safe
- *		to call in a privileged program; privileges should usually be
- *		dropped after allocating the locked memory block.
- *
- *		You must call @sub_init@ before allocating locked memory
- *		buffers.
- */
-
-extern int l_init(lmem */*lm*/, size_t /*sz*/);
-
-/* --- @l_alloc@ --- *
- *
- * Arguments:	@lmem *lm@ = pointer to locked memory descriptor
- *		@size_t sz@ = size requested
- *
- * Returns:	Pointer to allocated memory.
- *
- * Use:		Allocates @sz@ bytes of locked memory.
- */
-
-extern void *l_alloc(lmem */*lm*/, size_t /*sz*/);
-
-/* --- @l_free@ --- *
- *
- * Arguments:	@lmem *lm@ = pointer to locked memory descriptor
- *		@void *p@ = pointer to block
- *
- * Returns:	---
- *
- * Use:		Releases a block of locked memory.
- */
-
-extern void l_free(lmem */*lm*/, void */*p*/);
-
-/* --- @l_purge@ --- *
- *
- * Arguments:	@lmem *lm@ = pointer to locked memory descriptor
- *
- * Returns:	---
- *
- * Use:		Purges all the free blocks in the buffer, and clears all of
- *		the locked memory.  Memory is not freed back to the system.
- */
-
-extern void l_purge(lmem */*lm*/);
-
-/* --- @l_destroy@ --- *
- *
- * Arguments:	@lmem *lm@ = pointer to locked memory descriptor
- *
- * Returns:	---
- *
- * Use:		Disposes of a locked memory arena permanently.
- */
-
-extern void l_destroy(lmem */*lm*/);
-
-/* --- @l_report@ --- *
- *
- * Arguments:	@lmem *lm@ = pointer to locked memory descriptor
- *		@dstr *d@ = string to write the error message on
- *
- * Returns:	Zero if the buffer is fine, @+1@ if there was a problem
- *		getting locked memory but insecure stuff could be allocated,
- *		and @-1@ if not even insecure memory could be found.
- *
- * Use:		Returns a user-digestable explanation for the state of a
- *		locked memory buffer.  If the return code is zero, no message
- *		is emitted to the string @d@.
- */
-
-extern int l_report(lmem */*lm*/, dstr */*d*/);
-
-/*----- That's all, folks -------------------------------------------------*/
-
-#ifdef __cplusplus
-  }
-#endif
-
-#endif