mmap.c

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

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 */

#include "apr.h"
#include "apr_private.h"
#include "apr_general.h"
#include "apr_mmap.h"
#include "apr_errno.h"
#include "fileio.h"
#include "apr_portable.h"

/* System headers required for the mmap library */
#ifdef BEOS
#include <kernel/OS.h>
#endif
#if APR_HAVE_STRING_H
#include <string.h>
#endif
#if APR_HAVE_STDIO_H
#include <stdio.h>
#endif
#ifdef HAVE_SYS_STAT_H
#include <sys/stat.h>
#endif
#ifdef HAVE_SYS_MMAN_H
#include <sys/mman.h>
#endif

#if APR_HAS_MMAP || defined(BEOS)

static apr_status_t mmap_cleanup(void *themmap)
{
    apr_mmap_t *mm = themmap;
    int rv;
#ifdef BEOS
    rv = delete_area(mm->area);

    if (rv == 0) {
        mm->mm = (void *)-1;
        return APR_SUCCESS;
    }
#else
    rv = munmap(mm->mm, mm->size);

    if (rv == 0) {
        mm->mm = (void *)-1;
        return APR_SUCCESS;
    }
#endif
    return errno;
}

apr_status_t apr_mmap_create(apr_mmap_t **new, apr_file_t *file, 
                             apr_off_t offset, apr_size_t size, 
                             apr_int32_t flag, apr_pool_t *cont)
{
    apr_int32_t native_flags = 0;
#ifdef BEOS
    void *mm;
    area_id aid = -1;
    uint32 pages = 0;
#else
    void *mm;
#endif
   
    if (file == NULL || file->filedes == -1 || file->buffered)
        return APR_EBADF;
    (*new) = (apr_mmap_t *)apr_pcalloc(cont, sizeof(apr_mmap_t));
    
#ifdef BEOS
    /* XXX: mmap shouldn't really change the seek offset */
    apr_file_seek(file, APR_SET, &offset);
    if (flag & APR_MMAP_WRITE) {
        native_flags |= B_WRITE_AREA;
    }
    if (flag & APR_MMAP_READ) {
        native_flags |= B_READ_AREA;
    }

    /* There seems to be some strange interactions that mean our area must
     * be set as READ & WRITE or writev will fail!  Go figure...
     */
    pages = (size + B_PAGE_SIZE -1) / B_PAGE_SIZE;
    aid = create_area("apr_mmap", &mm , B_ANY_ADDRESS, pages * B_PAGE_SIZE,
        B_NO_LOCK, B_WRITE_AREA|B_READ_AREA);

    if (aid < B_NO_ERROR) {
        /* we failed to get an area we can use... */
        return APR_ENOMEM;
    }

    if (aid >= B_NO_ERROR)
        read(file->filedes, mm, size);
    
    (*new)->area = aid;
#else

    if (flag & APR_MMAP_WRITE) {
        native_flags |= PROT_WRITE;
    }
    if (flag & APR_MMAP_READ) {
        native_flags |= PROT_READ;
    }

    mm = mmap(NULL, size, PROT_READ, MAP_SHARED, file->filedes, offset);

    if (mm == (void *)-1) {
        /* we failed to get an mmap'd file... */
        return APR_ENOMEM;
    }
#endif

    (*new)->mm = mm;
    (*new)->size = size;
    (*new)->cntxt = cont;
    
    /* register the cleanup... */
    apr_pool_cleanup_register((*new)->cntxt, (void*)(*new), mmap_cleanup,
             apr_pool_cleanup_null);
    return APR_SUCCESS;
}

apr_status_t apr_mmap_delete(apr_mmap_t *mmap)
{
    apr_status_t rv;

    if (mmap->mm == (void *)-1)
        return APR_ENOENT;
      
    if ((rv = mmap_cleanup(mmap)) == APR_SUCCESS) {
        apr_pool_cleanup_kill(mmap->cntxt, mmap, mmap_cleanup);
        return APR_SUCCESS;
    }
    return rv;
}

#endif