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/*
* Copyright (C) 2006-2007 XenSource Ltd.
* Copyright (C) 2008 Citrix Ltd.
* Author Vincent Hanquez <vincent.hanquez@eu.citrix.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published
* by the Free Software Foundation; version 2.1 only. with the special
* exception on linking described in file LICENSE.
*
* This program 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 Lesser General Public License for more details.
*/
#include <unistd.h>
#include <stdlib.h>
#include <sys/mman.h>
#include <string.h>
#include <errno.h>
#include "mmap_stubs.h"
#include <caml/mlvalues.h>
#include <caml/memory.h>
#include <caml/alloc.h>
#include <caml/custom.h>
#include <caml/fail.h>
#include <caml/callback.h>
#define Intf_val(a) ((struct mmap_interface *) a)
static int mmap_interface_init(struct mmap_interface *intf,
int fd, int pflag, int mflag,
int len, int offset)
{
intf->len = len;
intf->addr = mmap(NULL, len, pflag, mflag, fd, offset);
return (intf->addr == MAP_FAILED) ? errno : 0;
}
CAMLprim value stub_mmap_init(value fd, value pflag, value mflag,
value len, value offset)
{
CAMLparam5(fd, pflag, mflag, len, offset);
CAMLlocal1(result);
int c_pflag, c_mflag;
switch (Int_val(pflag)) {
case 0: c_pflag = PROT_READ; break;
case 1: c_pflag = PROT_WRITE; break;
case 2: c_pflag = PROT_READ|PROT_WRITE; break;
default: caml_invalid_argument("protectiontype");
}
switch (Int_val(mflag)) {
case 0: c_mflag = MAP_SHARED; break;
case 1: c_mflag = MAP_PRIVATE; break;
default: caml_invalid_argument("maptype");
}
result = caml_alloc(sizeof(struct mmap_interface), Abstract_tag);
if (mmap_interface_init(Intf_val(result), Int_val(fd),
c_pflag, c_mflag,
Int_val(len), Int_val(offset)))
caml_failwith("mmap");
CAMLreturn(result);
}
CAMLprim value stub_mmap_final(value intf)
{
CAMLparam1(intf);
if (Intf_val(intf)->addr != MAP_FAILED)
munmap(Intf_val(intf)->addr, Intf_val(intf)->len);
Intf_val(intf)->addr = MAP_FAILED;
CAMLreturn(Val_unit);
}
CAMLprim value stub_mmap_read(value intf, value start, value len)
{
CAMLparam3(intf, start, len);
CAMLlocal1(data);
int c_start;
int c_len;
c_start = Int_val(start);
c_len = Int_val(len);
if (c_start > Intf_val(intf)->len)
caml_invalid_argument("start invalid");
if (c_start + c_len > Intf_val(intf)->len)
caml_invalid_argument("len invalid");
data = caml_alloc_string(c_len);
memcpy((char *) data, Intf_val(intf)->addr + c_start, c_len);
CAMLreturn(data);
}
CAMLprim value stub_mmap_write(value intf, value data,
value start, value len)
{
CAMLparam4(intf, data, start, len);
int c_start;
int c_len;
c_start = Int_val(start);
c_len = Int_val(len);
if (c_start > Intf_val(intf)->len)
caml_invalid_argument("start invalid");
if (c_start + c_len > Intf_val(intf)->len)
caml_invalid_argument("len invalid");
memcpy(Intf_val(intf)->addr + c_start, (char *) data, c_len);
CAMLreturn(Val_unit);
}
CAMLprim value stub_mmap_getpagesize(value unit)
{
CAMLparam1(unit);
CAMLlocal1(data);
data = Val_int(getpagesize());
CAMLreturn(data);
}
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