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/* Make a malloced buffer suitable for returning from a mach rpc
Copyright (C) 1996, 1998, 1999 Free Software Foundation, Inc.
Written by Miles Bader <miles@gnu.org>
This file is part of the GNU Hurd.
The GNU Hurd 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 2, or (at
your option) any later version.
The GNU Hurd 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 this program; if not, write to the Free Software Foundation, Inc.,
675 Mass Ave, Cambridge, MA 02139, USA. */
#include <string.h>
#include <mach.h>
#include <sys/mman.h>
#include <stdlib.h>
#include "iohelp.h"
/* Puts data from the malloced buffer BUF, LEN bytes long, into RBUF & RLEN,
suitable for returning from a mach rpc. If LEN > 0, BUF is freed,
regardless of whether an error is returned or not. */
error_t
iohelp_return_malloced_buffer (char *buf, size_t len,
char **rbuf, mach_msg_type_number_t *rlen)
{
error_t err = 0;
if (*rlen < len)
{
*rbuf = mmap (0, len, PROT_READ|PROT_WRITE, MAP_ANON, 0, 0);
err = (*rbuf == (char *) -1) ? errno : 0;
}
if (! err)
{
if (len)
memcpy (*rbuf, buf, len);
*rlen = len;
}
if (len > 0)
free (buf);
return err;
}
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