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Diffstat (limited to 'sysdeps/mach/hurd/getpriority.c')
-rw-r--r--sysdeps/mach/hurd/getpriority.c73
1 files changed, 73 insertions, 0 deletions
diff --git a/sysdeps/mach/hurd/getpriority.c b/sysdeps/mach/hurd/getpriority.c
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+++ b/sysdeps/mach/hurd/getpriority.c
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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 pibuf[0];
+
+ 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);
+}