apr_mmap.h

Apache V2.0.15 Alpha For Linuxhttpd-2_0_15-alpha.tar.Z

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#ifndef APR_MMAP_H
#define APR_MMAP_H

#include "apr.h"
#include "apr_pools.h"
#include "apr_errno.h"
#include "apr_file_io.h"        /* for apr_file_t */

#ifdef BEOS
#include <kernel/OS.h>
#endif

#ifdef __cplusplus
extern "C" {
#endif /* __cplusplus */

#define APR_MMAP_READ    1
#define APR_MMAP_WRITE   2

/**
 * @package APR MMAP library
 */

typedef struct apr_mmap_t            apr_mmap_t;
/* As far as I can tell the only really sane way to store an MMAP is as a
 * void * and a length.  BeOS requires this area_id, but that's just a little
 * something extra.  I am exposing this type, because it doesn't make much
 * sense to keep it private, and opening it up makes some stuff easier in
 * Apache.
 */
/** The MMAP structure */
struct apr_mmap_t {
    /** The pool the mmap structure was allocated out of. */
    apr_pool_t *cntxt;
#ifdef BEOS
    /** An area ID.  Only valid on BeOS */
    area_id area;
#endif
#ifdef WIN32
    /** The handle of the file mapping */
    HANDLE mhandle;
    /** The start of the real memory page area (mapped view) */
    void *mv;
    /** The physical start, size and offset */
    size_t pstart;
    size_t psize;
    size_t poffset;
#endif
    /** The start of the memory mapped area */
    void *mm;
    /** The amount of data in the mmap */
    size_t size;
};

#if APR_HAS_MMAP

/*   Function definitions */

/** 
 * Create a new mmap'ed file out of an existing APR file.
 * @param newmmap The newly created mmap'ed file.
 * @param file The file turn into an mmap.
 * @param offset The offset into the file to start the data pointer at.
 * @param size The size of the file
 * @param flag bit-wise or of:
 * <PRE>
 *          APR_MMAP_READ       MMap opened for reading
 *          APR_MMAP_WRITE      MMap opened for writing
 * </PRE>
 * @param cntxt The pool to use when creating the mmap.
 * @deffunc apr_status_t apr_mmap_create(apr_mmap_t **newmmap, apr_file_t *file, apr_off_t offset, apr_size_t size, apr_int32_t flag, apr_pool_t *cntxt)
 */
APR_DECLARE(apr_status_t) apr_mmap_create(apr_mmap_t **newmmap, 
                                          apr_file_t *file, apr_off_t offset,
                                          apr_size_t size, apr_int32_t flag,
                                          apr_pool_t *cntxt);

/**
 * Remove a mmap'ed.
 * @param mmap The mmap'ed file.
 * @deffunc apr_status_t apr_mmap_delete(apr_mmap_t *mmap)
 */
APR_DECLARE(apr_status_t) apr_mmap_delete(apr_mmap_t *mmap);

/** 
 * Move the pointer into the mmap'ed file to the specified offset.
 * @param addr The pointer to the offset specified.
 * @param mmap The mmap'ed file.
 * @param offset The offset to move to.
 * @deffunc apr_status_t apr_mmap_offset(void **addr, apr_mmap_t *mmap, apr_off_t offset)
 */
APR_DECLARE(apr_status_t) apr_mmap_offset(void **addr, apr_mmap_t *mmap, 
                                          apr_off_t offset);

#endif /* APR_HAS_MMAP */

#ifdef __cplusplus
}
#endif

#endif  /* ! APR_MMAP_H */