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