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/* Copyright (C) 2021 Free Software Foundation, Inc.
Written by Sergey Bugaev <bugaevc@gmail.com>.
This program 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.
This program 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 "priv.h"
#include <mach/mach4.h>
mach_port_t
pager_get_ro_port (struct pager *p)
{
error_t err = 0;;
mach_port_t port = MACH_PORT_NULL;
mach_port_t rw_port;
vm_offset_t offset = 0;
vm_offset_t start = 0;
vm_size_t len = ~0;
pthread_mutex_lock (&p->interlock);
if (!MACH_PORT_VALID (p->ro_proxy))
{
rw_port = ports_get_send_right (p);
if (!MACH_PORT_VALID (rw_port))
{
err = errno;
goto out;
}
err = memory_object_create_proxy (mach_task_self (),
VM_PROT_READ | VM_PROT_EXECUTE,
&rw_port, 1,
&offset, 1, &start, 1, &len, 1,
&p->ro_proxy);
mach_port_deallocate (mach_task_self (), rw_port);
if (err)
goto out;
}
port = p->ro_proxy;
out:
pthread_mutex_unlock (&p->interlock);
errno = err;
return port;
}
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