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- /* Copyright (C) 1994 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 Library General Public License as
- published by the Free Software Foundation; either version 2 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
- Library General Public License for more details.
-
- You should have received a copy of the GNU Library General Public
- License along with the GNU C Library; see the file COPYING.LIB. If
- not, write to the Free Software Foundation, Inc., 675 Mass Ave,
- Cambridge, MA 02139, 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, int 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;
- prierr = __task_priority (task, NICE_TO_MACH_PRIORITY (prio), 1);
- __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);
-
- 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;
- }
-