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99 lines
2.8 KiB
C
99 lines
2.8 KiB
C
/* Copyright (C) 1994-2020 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <hurd.h>
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#include <hurd/resource.h>
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/* Set the priority of all processes specified by WHICH and WHO
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to PRIO. Returns 0 on success, -1 on errors. */
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int
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__setpriority (enum __priority_which which, id_t who, int prio)
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{
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error_t err;
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error_t pidloser, priloser;
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unsigned int npids, ntasks, nwin, nperm, nacces;
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error_t setonepriority (pid_t pid, struct procinfo *pi)
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{
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task_t task;
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error_t piderr = __USEPORT (PROC, __proc_pid2task (port, pid, &task));
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if (piderr == EPERM)
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++nperm;
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if (piderr != ESRCH)
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{
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++npids;
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if (piderr && piderr != EPERM)
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pidloser = piderr;
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}
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if (! piderr)
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{
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error_t prierr;
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++ntasks;
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#ifdef POLICY_TIMESHARE_BASE_COUNT
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{
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/* XXX This assumes timeshare policy. */
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struct policy_timeshare_base base
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= { NICE_TO_MACH_PRIORITY (prio) };
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prierr = __task_policy (task, POLICY_TIMESHARE,
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(policy_base_t) &base,
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POLICY_TIMESHARE_BASE_COUNT,
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0, 1);
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}
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#else
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prierr = __task_priority (task, NICE_TO_MACH_PRIORITY (prio), 1);
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#endif
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__mach_port_deallocate (__mach_task_self (), task);
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switch (prierr)
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{
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case KERN_FAILURE:
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++nacces;
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break;
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case KERN_SUCCESS:
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++nwin;
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break;
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case KERN_INVALID_ARGUMENT: /* Task died. */
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--npids;
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--ntasks;
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break;
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default:
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priloser = prierr;
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}
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}
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return 0;
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}
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npids = ntasks = nwin = nperm = nacces = 0;
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pidloser = priloser = 0;
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err = _hurd_priority_which_map (which, who, setonepriority, 0);
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if (!err && npids == 0)
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/* No error, but no pids found. */
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err = ESRCH;
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else if (nperm == npids)
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/* Got EPERM from proc_task2pid for every process. */
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err = EPERM;
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else if (nacces == ntasks)
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/* Got KERN_FAILURE from task_priority for every task. */
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err = EACCES;
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else if (nwin == 0)
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err = pidloser ?: priloser;
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return err ? __hurd_fail (err) : 0;
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}
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libc_hidden_def (__setpriority)
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weak_alias (__setpriority, setpriority)
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