mes/lib/gnu/fd-read.c

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/* -*-comment-start: "//";comment-end:""-*-
* GNU Mes --- Maxwell Equations of Software
* Copyright © 2019 Jan (janneke) Nieuwenhuizen <janneke@gnu.org>
*
* This file is part of GNU Mes.
*
* GNU Mes is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or (at
* your option) any later version.
*
* GNU Mes 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with GNU Mes. If not, see <http://www.gnu.org/licenses/>.
*/
/** Commentary:
Inspired by implementation in GNU C Library:
_hurd_fd_read
Copyright (C) 1993-2016 Free Software Foundation, Inc.
*/
#include <gnu/hurd.h>
#include <gnu/syscall.h>
#include <string.h>
#include <errno.h>
error_t
fd_read (mach_port_t port, void *buffer, size_t *read, loff_t offset)
{
char *data;
error_t e = __io_read (port, &data, read, offset, *read);
if (!e)
memcpy (buffer, data, *read);
return e;
}