1 files changed, 85 insertions, 0 deletions
diff --git a/sysdeps/mach/hurd/setpriority.c b/sysdeps/mach/hurd/setpriority.c
new file mode 100644
index 0000000000..644bfdf6fe
--- /dev/null
+++ b/sysdeps/mach/hurd/setpriority.c
@@ -0,0 +1,85 @@
+/* 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 <hurd.h>
+#include <hurd/resource.h>
+
+/* Set the priority of all processes specified by WHICH and WHO
+   to PRIO.  Returns 0 on success, -1 on errors.  */
+int
+setpriority (enum __priority_which which, int who, int prio)
+{
+  error_t err;
+  error_t pidloser, priloser;
+  unsigned int npids, ntasks, nwin, nperm, nacces;
+
+  error_t setonepriority (pid_t pid, struct procinfo *pi)
+    {
+      task_t task;
+      error_t piderr = __USEPORT (PROC, __proc_pid2task (port, pid, &task));
+      if (piderr == EPERM)
+	++nperm;
+      if (piderr != ESRCH)
+	{
+	  ++npids;
+	  if (piderr && piderr != EPERM)
+	    pidloser = piderr;
+	}
+      if (! piderr)
+	{
+	  error_t prierr;
+	  ++ntasks;
+	  prierr = __task_priority (task, NICE_TO_MACH_PRIORITY (prio), 1);
+	  __mach_port_deallocate (__mach_task_self (), task);
+	  switch (prierr)
+	    {
+	    case KERN_FAILURE:
+	      ++nacces;
+	      break;
+	    case KERN_SUCCESS:
+	      ++nwin;
+	      break;
+	    case KERN_INVALID_ARGUMENT: /* Task died.  */
+	      --npids;
+	      --ntasks;
+	      break;
+	    default:
+	      priloser = prierr;
+	    }
+	}
+      return 0;
+    }
+
+  npids = ntasks = nwin = nperm = nacces = 0;
+  pidloser = priloser = 0;
+  err = _hurd_priority_which_map (which, who, setonepriority);
+
+  if (!err && npids == 0)
+    /* No error, but no pids found.  */
+    err = ESRCH;
+  else if (nperm == npids)
+    /* Got EPERM from proc_task2pid for every process.  */
+    err = EPERM;
+  else if (nacces == ntasks)
+    /* Got KERN_FAILURE from task_priority for every task.  */
+    err = EACCES;
+  else if (nwin == 0)
+    err = pidloser ?: priloser;
+
+  return err ? __hurd_fail (err) : 0;
+}