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