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/* Run a task on slave_pset
Copyright (C) 2024 Free Software Foundation, Inc.
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 <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <error.h>
#include <hurd.h>
#include <version.h>
#include <mach/mach_types.h>
#include <mach/mach_host.h>
static void
smp (char * const argv[])
{
int i;
error_t err;
mach_msg_type_number_t pset_count;
mach_port_t hostpriv;
processor_set_name_array_t psets = {0};
processor_set_t slave_pset = MACH_PORT_NULL;
err = get_privileged_ports (&hostpriv, NULL);
if (err)
error (1, err, "Must be run as root for privileged cpu control");
err = host_processor_sets (hostpriv, &psets, &pset_count);
if (err)
error (1, err, "Cannot get list of host processor sets");
if (pset_count < 2)
error (1, ENOSYS, "gnumach does not have the expected processor sets, are you running smp kernel?");
err = host_processor_set_priv (hostpriv, psets[1], &slave_pset);
mach_port_deallocate (mach_task_self (), hostpriv);
for (i = 0; i < pset_count; i++)
mach_port_deallocate (mach_task_self (), psets[i]);
if (err)
error (1, err, "Cannot get access to slave processor set");
err = task_assign (mach_task_self (), slave_pset, FALSE);
mach_port_deallocate (mach_task_self (), slave_pset);
if (err)
error (1, err, "Cannot assign task self to slave processor set");
/* Drop privileges from suid binary */
mach_port_deallocate (mach_task_self (), _hurd_host_priv);
setuid (getuid ());
execve (argv[0], argv, environ);
/* Fall through if not executed */
error (1, errno, "failed to execute %s", argv[0]);
}
int
main (int argc, char **argv)
{
if (argc < 2)
error (1, 0, "Usage: smp /path/to/executable");
smp (argv + 1);
return 0;
}
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