1 /* Copyright (C) 1994, 1995, 1997, 2000 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
4 The GNU C Library is free software; you can redistribute it and/or
5 modify it under the terms of the GNU Lesser General Public
6 License as published by the Free Software Foundation; either
7 version 2.1 of the License, or (at your option) any later version.
9 The GNU C Library is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 Lesser General Public License for more details.
14 You should have received a copy of the GNU Lesser General Public
15 License along with the GNU C Library; if not, write to the Free
16 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
20 #include <hurd/resource.h>
22 /* Set the priority of all processes specified by WHICH and WHO
23 to PRIO. Returns 0 on success, -1 on errors. */
25 setpriority (enum __priority_which which, id_t who, int prio)
28 error_t pidloser, priloser;
29 unsigned int npids, ntasks, nwin, nperm, nacces;
31 error_t setonepriority (pid_t pid, struct procinfo *pi)
34 error_t piderr = __USEPORT (PROC, __proc_pid2task (port, pid, &task));
40 if (piderr && piderr != EPERM)
47 prierr = __task_priority (task, NICE_TO_MACH_PRIORITY (prio), 1);
48 __mach_port_deallocate (__mach_task_self (), task);
57 case KERN_INVALID_ARGUMENT: /* Task died. */
68 npids = ntasks = nwin = nperm = nacces = 0;
69 pidloser = priloser = 0;
70 err = _hurd_priority_which_map (which, who, setonepriority, 0);
72 if (!err && npids == 0)
73 /* No error, but no pids found. */
75 else if (nperm == npids)
76 /* Got EPERM from proc_task2pid for every process. */
78 else if (nacces == ntasks)
79 /* Got KERN_FAILURE from task_priority for every task. */
82 err = pidloser ?: priloser;
84 return err ? __hurd_fail (err) : 0;