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/* Copyright (C) 1994-2015 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 Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<http://www.gnu.org/licenses/>. */
#include <hurd.h>
#include <hurd/resource.h>
/* Set the priority of all processes specified by WHICH and WHO
to PRIO. Returns 0 on success, -1 on errors. */
int
setpriority (enum __priority_which which, id_t who, int prio)
{
error_t err;
error_t pidloser, priloser;
unsigned int npids, ntasks, nwin, nperm, nacces;
error_t setonepriority (pid_t pid, struct procinfo *pi)
{
task_t task;
error_t piderr = __USEPORT (PROC, __proc_pid2task (port, pid, &task));
if (piderr == EPERM)
++nperm;
if (piderr != ESRCH)
{
++npids;
if (piderr && piderr != EPERM)
pidloser = piderr;
}
if (! piderr)
{
error_t prierr;
++ntasks;
#ifdef POLICY_TIMESHARE_BASE_COUNT
{
/* XXX This assumes timeshare policy. */
struct policy_timeshare_base base
= { NICE_TO_MACH_PRIORITY (prio) };
prierr = __task_policy (task, POLICY_TIMESHARE,
(policy_base_t) &base,
POLICY_TIMESHARE_BASE_COUNT,
0, 1);
}
#else
prierr = __task_priority (task, NICE_TO_MACH_PRIORITY (prio), 1);
#endif
__mach_port_deallocate (__mach_task_self (), task);
switch (prierr)
{
case KERN_FAILURE:
++nacces;
break;
case KERN_SUCCESS:
++nwin;
break;
case KERN_INVALID_ARGUMENT: /* Task died. */
--npids;
--ntasks;
break;
default:
priloser = prierr;
}
}
return 0;
}
npids = ntasks = nwin = nperm = nacces = 0;
pidloser = priloser = 0;
err = _hurd_priority_which_map (which, who, setonepriority, 0);
if (!err && npids == 0)
/* No error, but no pids found. */
err = ESRCH;
else if (nperm == npids)
/* Got EPERM from proc_task2pid for every process. */
err = EPERM;
else if (nacces == ntasks)
/* Got KERN_FAILURE from task_priority for every task. */
err = EACCES;
else if (nwin == 0)
err = pidloser ?: priloser;
return err ? __hurd_fail (err) : 0;
}
libc_hidden_def (setpriority)
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