Initial revision
authorroland <roland>
Fri, 9 Dec 1994 05:02:05 +0000 (05:02 +0000)
committerroland <roland>
Fri, 9 Dec 1994 05:02:05 +0000 (05:02 +0000)
hurd/hurdprio.c [new file with mode: 0644]

diff --git a/hurd/hurdprio.c b/hurd/hurdprio.c
new file mode 100644 (file)
index 0000000..d7beb3c
--- /dev/null
@@ -0,0 +1,87 @@
+/* Support code for dealing with priorities in the Hurd.
+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/resource.h>
+#include <hurd.h>
+
+error_t
+_hurd_priority_which_map (enum __priority_which which, int who,
+                         error_t (*function) (pid_t, struct procinfo *))
+{
+  mach_msg_type_number_t npids = 64, i;
+  pid_t pidbuf[npids], *pids;
+  error_t err;
+  struct procinfo *pip;
+  int pibuf[sizeof *pip + 5 * sizeof (pip->threadinfos[0])], *pi = pibuf;
+  mach_msg_type_number_t pisize = sizeof (pibuf) / sizeof (int);
+
+  switch (which)
+    {
+    case PRIO_PROCESS:
+      npids = 1;
+      pids[0] = who;
+      err = 0;
+      break;
+
+    case PRIO_PGRP:
+      err = __USEPORT (PROC, __proc_getpgrppids (port, who, &pids, &npids));
+      break;
+
+    case PRIO_USER:
+      err = __USEPORT (PROC, __proc_getallpids (port, &pids, &npids));
+      break;
+
+    default:
+      return EINVAL;
+    }
+
+  for (i = 0; !err && i < npids; ++i)
+    {
+      if (which == PRIO_USER)
+       {
+         /* Get procinfo to check the owner.  */
+         int *oldpi = pi;
+         mach_msg_type_number_t oldpisize = pisize;
+         if (err = __USEPORT (PROC, __proc_getprocinfo (port, pids[i],
+                                                        &pi, &pisize)))
+           continue;
+         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 (pip->owner != who)
+           continue;
+       }
+      else
+       pip = NULL;
+
+      err = (*function) (pids[i], pip);
+    }
+
+  if (pids != pidbuf)
+    __vm_deallocate (__mach_task_self (),
+                    (vm_address_t) pids, npids * sizeof pids[0]);
+  if (pi != pibuf)
+    __vm_deallocate (__mach_task_self (),
+                    (vm_address_t) pi, pisize * sizeof pi[0]);
+
+  return err;
+}