53 lines
1.9 KiB
C
53 lines
1.9 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. All rights reserved. This file is distributed */
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/* under the terms of the GNU Library General Public License, with */
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/* the special exception on linking described in file ../../LICENSE. */
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/* */
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/***********************************************************************/
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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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CAMLprim value unix_read(value fd, value buf, value ofs, value vlen)
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{
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intnat len;
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DWORD numbytes, numread;
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char iobuf[UNIX_BUFFER_SIZE];
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DWORD err = 0;
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Begin_root (buf);
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len = Long_val(vlen);
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numbytes = len > UNIX_BUFFER_SIZE ? UNIX_BUFFER_SIZE : len;
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if (Descr_kind_val(fd) == KIND_SOCKET) {
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int ret;
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SOCKET s = Socket_val(fd);
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enter_blocking_section();
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ret = recv(s, iobuf, numbytes, 0);
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if (ret == SOCKET_ERROR) err = WSAGetLastError();
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leave_blocking_section();
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numread = ret;
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} else {
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HANDLE h = Handle_val(fd);
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enter_blocking_section();
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if (! ReadFile(h, iobuf, numbytes, &numread, NULL))
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err = GetLastError();
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leave_blocking_section();
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}
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if (err) {
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win32_maperr(err);
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uerror("read", Nothing);
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}
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memmove (&Byte(buf, Long_val(ofs)), iobuf, numread);
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End_roots();
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return Val_int(numread);
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}
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