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/* Copyright (C) 1994 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version.
The GNU C Library 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
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with the GNU C Library; see the file COPYING.LIB. If
not, write to the Free Software Foundation, Inc., 675 Mass Ave,
Cambridge, MA 02139, USA. */
#include <sys/types.h>
#include <sys/mman.h>
#include <errno.h>
#include <hurd.h>
#include <hurd/fd.h>
/* Map addresses starting near ADDR and extending for LEN bytes. from
OFFSET into the file FD describes according to PROT and FLAGS. If ADDR
is nonzero, it is the desired mapping address. If the MAP_FIXED bit is
set in FLAGS, the mapping will be at ADDR exactly (which must be
page-aligned); otherwise the system chooses a convenient nearby address.
The return value is the actual mapping address chosen or (caddr_t) -1
for errors (in which case `errno' is set). A successful `mmap' call
deallocates any previous mapping for the affected region. */
caddr_t
mmap (caddr_t addr, size_t len, int prot, int flags, int fd, off_t offset)
{
error_t err;
vm_prot_t vmprot;
memory_object_t memobj;
vm_address_t mapaddr;
vmprot = VM_PROT_NONE;
if (prot & PROT_READ)
vmprot |= VM_PROT_READ;
if (prot & PROT_WRITE)
vmprot |= VM_PROT_WRITE;
if (prot & PROT_EXEC)
vmprot |= VM_PROT_EXECUTE;
switch (flags & MAP_TYPE)
{
default:
return (caddr_t) (long int) __hurd_fail (EINVAL);
case MAP_ANON:
memobj = MACH_PORT_NULL;
break;
case MAP_FILE:
{
mach_port_t robj, wobj;
if (err = HURD_DPORT_USE (fd, __io_map (port, &robj, &wobj)))
return (caddr_t) (long int) __hurd_dfail (fd, err);
switch (prot & (PROT_READ|PROT_WRITE))
{
case PROT_READ:
memobj = robj;
__mach_port_deallocate (__mach_task_self (), wobj);
break;
case PROT_WRITE:
memobj = wobj;
__mach_port_deallocate (__mach_task_self (), robj);
break;
case PROT_READ|PROT_WRITE:
__mach_port_deallocate (__mach_task_self (), robj);
if (robj == wobj)
memobj = wobj;
else
{
__mach_port_deallocate (__mach_task_self (), wobj);
return ((caddr_t) (long int)
__hurd_fail (EGRATUITOUS)); /* XXX */
}
break;
}
break;
/* XXX handle MAP_NOEXTEND */
}
}
mapaddr = (vm_address_t) addr;
err = __vm_map (__mach_task_self (),
&mapaddr, (vm_size_t) len, (vm_address_t) 0,
flags & MAP_FIXED,
memobj, (vm_offset_t) offset,
flags & (MAP_COPY|MAP_PRIVATE),
vmprot, VM_PROT_ALL,
flags & MAP_INHERIT);
if (memobj != MACH_PORT_NULL)
__mach_port_deallocate (__mach_task_self (), memobj);
return err ? (caddr_t) (long int) __hurd_fail (err) : (caddr_t) mapaddr;
}
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