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glibc/sysdeps/mach/hurd/setpriority.c
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/* Copyright (C) 1994,95,97,2000,02 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, write to the Free | |
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA | |
02111-1307 USA. */ | |
#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) |