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85 lines
2.8 KiB
C
85 lines
2.8 KiB
C
/* Copyright (C) 1994,95,96,97,2000,02 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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<http://www.gnu.org/licenses/>. */
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#include <limits.h>
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#include <hurd.h>
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#include <hurd/resource.h>
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/* Return the highest priority of any process specified by WHICH and WHO
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(see <sys/resource.h>); if WHO is zero, the current process, process group,
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or user (as specified by WHO) is used. A lower priority number means higher
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priority. Priorities range from PRIO_MIN to PRIO_MAX. */
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int
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getpriority (enum __priority_which which, id_t who)
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{
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error_t err, onerr;
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int maxpri = INT_MIN;
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struct procinfo *pip; /* Just for sizeof. */
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int pibuf[sizeof *pip + 2 * sizeof (pip->threadinfos[0])], *pi = pibuf;
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size_t pisize = sizeof pibuf / sizeof pibuf[0];
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error_t getonepriority (pid_t pid, struct procinfo *pip)
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{
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if (pip)
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onerr = 0;
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else
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{
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int *oldpi = pi;
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size_t oldpisize = pisize;
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char *tw = 0;
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size_t twsz = 0;
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int flags = PI_FETCH_TASKINFO;
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onerr = __USEPORT (PROC, __proc_getprocinfo (port, pid, &flags,
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&pi, &pisize,
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&tw, &twsz));
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if (twsz)
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__vm_deallocate (__mach_task_self (), (vm_address_t) tw, twsz);
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if (pi != oldpi && oldpi != pibuf)
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/* Old buffer from last call was not reused; free it. */
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__vm_deallocate (__mach_task_self (),
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(vm_address_t) oldpi, oldpisize * sizeof pi[0]);
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pip = (struct procinfo *) pi;
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}
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#ifdef TASK_SCHED_TIMESHARE_INFO
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if (!onerr && pip->timeshare_base_info.base_priority > maxpri)
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maxpri = pip->timeshare_base_info.base_priority;
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#else
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if (!onerr && pip->taskinfo.base_priority > maxpri)
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maxpri = pip->taskinfo.base_priority;
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#endif
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return 0;
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}
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onerr = 0;
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err = _hurd_priority_which_map (which, who,
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getonepriority, PI_FETCH_TASKINFO);
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if (pi != pibuf)
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__vm_deallocate (__mach_task_self (),
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(vm_address_t) pi, pisize * sizeof pi[0]);
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if (!err && maxpri == INT_MIN)
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/* No error, but no pids found. */
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err = onerr ?: ESRCH;
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if (err)
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return __hurd_fail (err);
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return MACH_PRIORITY_TO_NICE (maxpri);
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}
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libc_hidden_def (getpriority)
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