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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 <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, int 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;
- unsigned int pisize = sizeof pibuf / sizeof int;
-
- error_t getonepriority (pid_t pid, struct procinfo *pip)
- {
- if (pip)
- onerr = 0;
- else
- {
- int *oldpi = pi;
- unsigned int oldpisize = pisize;
- onerr = __USEPORT (PROC, __proc_getprocinfo (port,
- pid,
- &pi, &pisize));
- 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;
- }
- if (!onerr && pip->taskinfo.base_priority > maxpri)
- maxpri = pip->taskinfo.base_priority;
- return 0;
- }
-
- onerr = 0;
- err = _hurd_priority_which_map (which, who, getonepriority);
-
- 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);
- }
-