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/**************************************************************************/
/* */
/* OCaml */
/* */
/* Xavier Leroy, projet Cristal, INRIA Rocquencourt */
/* */
/* Copyright 1996 Institut National de Recherche en Informatique et */
/* en Automatique. */
/* */
/* All rights reserved. This file is distributed under the terms of */
/* the GNU Lesser General Public License version 2.1, with the */
/* special exception on linking described in the file LICENSE. */
/* */
/**************************************************************************/
#include <string.h>
#include <caml/mlvalues.h>
#include <caml/memory.h>
#include <caml/signals.h>
#include "unixsupport.h"
CAMLprim value caml_unix_read(value fd, value buf, value ofs, value len)
{
CAMLparam1(buf);
long numbytes;
int ret;
char iobuf[UNIX_BUFFER_SIZE];
numbytes = Long_val(len);
if (numbytes > UNIX_BUFFER_SIZE) numbytes = UNIX_BUFFER_SIZE;
caml_enter_blocking_section();
ret = read(Int_val(fd), iobuf, (int) numbytes);
caml_leave_blocking_section();
if (ret == -1) caml_uerror("read", Nothing);
memmove (&Byte(buf, Long_val(ofs)), iobuf, ret);
CAMLreturn(Val_int(ret));
}
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