42 lines
1.5 KiB
C
42 lines
1.5 KiB
C
/***********************************************************************/
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/* */
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/* Objective Caml */
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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. All rights reserved. This file is distributed */
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/* under the terms of the GNU Library General Public License. */
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/* */
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/***********************************************************************/
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/* $Id$ */
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#include <string.h>
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#include <mlvalues.h>
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#include <memory.h>
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#include <signals.h>
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#include "unixsupport.h"
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value unix_read(value fd, value buf, value ofs, value len) /* ML */
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{
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DWORD numbytes, numread;
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BOOL ret;
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char iobuf[UNIX_BUFFER_SIZE];
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HANDLE h = Handle_val(fd);
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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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enter_blocking_section();
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ret = ReadFile(h, iobuf, numbytes, &numread, NULL);
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leave_blocking_section();
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if (! ret) {
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_dosmaperr(GetLastError());
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uerror("read", Nothing);
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}
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bcopy(iobuf, &Byte(buf, Long_val(ofs)), numread);
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End_roots();
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return Val_int(numread);
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}
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