117 lines
3.8 KiB
C
117 lines
3.8 KiB
C
/***********************************************************************/
|
|
/* */
|
|
/* Objective Caml */
|
|
/* */
|
|
/* Manuel Serrano and Xavier Leroy, INRIA Rocquencourt */
|
|
/* */
|
|
/* Copyright 2000 Institut National de Recherche en Informatique et */
|
|
/* en Automatique. All rights reserved. This file is distributed */
|
|
/* under the terms of the GNU Library General Public License. */
|
|
/* */
|
|
/***********************************************************************/
|
|
|
|
/* $Id$ */
|
|
|
|
#include <stddef.h>
|
|
#include <string.h>
|
|
#include "bigarray.h"
|
|
#include "custom.h"
|
|
#include "fail.h"
|
|
#include "mlvalues.h"
|
|
#include "sys.h"
|
|
|
|
extern int bigarray_element_size[]; /* from bigarray_stubs.c */
|
|
|
|
#ifdef HAS_UNISTD
|
|
#include <unistd.h>
|
|
#endif
|
|
#ifdef HAS_MMAP
|
|
#include <sys/types.h>
|
|
#include <sys/mman.h>
|
|
#endif
|
|
|
|
#if defined(HAS_MMAP)
|
|
|
|
#ifndef MAP_FAILED
|
|
#define MAP_FAILED ((void *) -1)
|
|
#endif
|
|
|
|
CAMLprim value bigarray_map_file(value vfd, value vkind, value vlayout,
|
|
value vshared, value vdim)
|
|
{
|
|
int fd, flags, major_dim, shared;
|
|
long num_dims, i;
|
|
long dim[MAX_NUM_DIMS];
|
|
long currpos, file_size;
|
|
unsigned long array_size;
|
|
char c;
|
|
void * addr;
|
|
|
|
fd = Int_val(vfd);
|
|
flags = Int_val(vkind) | Int_val(vlayout);
|
|
num_dims = Wosize_val(vdim);
|
|
major_dim = flags & BIGARRAY_FORTRAN_LAYOUT ? num_dims - 1 : 0;
|
|
/* Extract dimensions from Caml array */
|
|
num_dims = Wosize_val(vdim);
|
|
if (num_dims < 1 || num_dims > MAX_NUM_DIMS)
|
|
invalid_argument("Bigarray.mmap: bad number of dimensions");
|
|
for (i = 0; i < num_dims; i++) {
|
|
dim[i] = Long_val(Field(vdim, i));
|
|
if (dim[i] == -1 && i == major_dim) continue;
|
|
if (dim[i] < 0 || dim[i] > 0x7FFFFFFFL)
|
|
invalid_argument("Bigarray.create: negative dimension");
|
|
}
|
|
/* Determine file size */
|
|
currpos = lseek(fd, 0, SEEK_CUR);
|
|
if (currpos == -1) sys_error(NO_ARG);
|
|
file_size = lseek(fd, 0, SEEK_END);
|
|
if (file_size == -1) sys_error(NO_ARG);
|
|
/* Determine array size in bytes (or size of array without the major
|
|
dimension if that dimension wasn't specified) */
|
|
array_size = bigarray_element_size[flags & BIGARRAY_KIND_MASK];
|
|
for (i = 0; i < num_dims; i++)
|
|
if (dim[i] != -1) array_size *= dim[i];
|
|
/* Check if the first/last dimension is unknown */
|
|
if (dim[major_dim] == -1) {
|
|
/* Determine first/last dimension from file size */
|
|
if ((unsigned long) file_size % array_size != 0)
|
|
failwith("Bigarray.mmap: file size doesn't match array dimensions");
|
|
dim[major_dim] = (unsigned long) file_size / array_size;
|
|
array_size = file_size;
|
|
} else {
|
|
/* Check that file is large enough, and grow it otherwise */
|
|
if (file_size < array_size) {
|
|
if (lseek(fd, array_size - 1, SEEK_SET) == -1) sys_error(NO_ARG);
|
|
c = 0;
|
|
if (write(fd, &c, 1) != 1) sys_error(NO_ARG);
|
|
}
|
|
}
|
|
/* Restore original file position */
|
|
lseek(fd, currpos, SEEK_SET);
|
|
/* Do the mmap */
|
|
shared = Bool_val(vshared) ? MAP_SHARED : MAP_PRIVATE;
|
|
addr = mmap(NULL, array_size, PROT_READ | PROT_WRITE, shared, fd, 0);
|
|
if (addr == (void *) MAP_FAILED) sys_error(NO_ARG);
|
|
/* Build and return the Caml bigarray */
|
|
return alloc_bigarray(flags | BIGARRAY_MAPPED_FILE, num_dims, addr, dim);
|
|
}
|
|
|
|
#else
|
|
|
|
value bigarray_map_file(value vfd, value vkind, value vlayout,
|
|
value vshared, value vdim)
|
|
{
|
|
invalid_argument("Bigarray.map_file: not supported");
|
|
return Val_unit;
|
|
}
|
|
|
|
#endif
|
|
|
|
|
|
void bigarray_unmap_file(void * addr, unsigned long len)
|
|
{
|
|
#if defined(HAS_MMAP)
|
|
munmap(addr, len);
|
|
#endif
|
|
}
|