hurd/hurdprio.c

   1 /* Support code for dealing with priorities in the Hurd.
   2 Copyright (C) 1994, 1995, 1996 Free Software Foundation, Inc.
   3 This file is part of the GNU C Library.
   4
   5 The GNU C Library is free software; you can redistribute it and/or
   6 modify it under the terms of the GNU Library General Public License as
   7 published by the Free Software Foundation; either version 2 of the
   8 License, or (at your option) any later version.
   9
  10 The GNU C Library is distributed in the hope that it will be useful,
  11 but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13 Library General Public License for more details.
  14
  15 You should have received a copy of the GNU Library General Public
  16 License along with the GNU C Library; see the file COPYING.LIB.  If
  17 not, write to the Free Software Foundation, Inc., 675 Mass Ave,
  18 Cambridge, MA 02139, USA.  */
  19
  20 #include <hurd/resource.h>
  21 #include <hurd.h>
  22
  23 error_t
  24 _hurd_priority_which_map (enum __priority_which which, int who,
  25                           error_t (*function) (pid_t, struct procinfo *),
  26                           int pi_flags)
  27 {
  28   mach_msg_type_number_t npids = 64, i;
  29   pid_t pidbuf[npids], *pids;
  30   error_t err;
  31   struct procinfo *pip;
  32   int pibuf[sizeof *pip + 5 * sizeof (pip->threadinfos[0])], *pi = pibuf;
  33   mach_msg_type_number_t pisize = sizeof (pibuf) / sizeof (int);
  34
  35   switch (which)
  36     {
  37     case PRIO_PROCESS:
  38       npids = 1;
  39       pids[0] = who;
  40       err = 0;
  41       break;
  42
  43     case PRIO_PGRP:
  44       err = __USEPORT (PROC, __proc_getpgrppids (port, who, &pids, &npids));
  45       break;
  46
  47     case PRIO_USER:
  48       err = __USEPORT (PROC, __proc_getallpids (port, &pids, &npids));
  49       break;
  50
  51     default:
  52       return EINVAL;
  53     }
  54
  55   for (i = 0; !err && i < npids; ++i)
  56     {
  57       if (which == PRIO_USER)
  58         {
  59           /* Get procinfo to check the owner.  */
  60           int *oldpi = pi;
  61           mach_msg_type_number_t oldpisize = pisize;
  62           char *tw = 0;
  63           size_t twsz = 0;
  64           if (err = __USEPORT (PROC, __proc_getprocinfo (port, pids[i],
  65                                                          &pi_flags,
  66                                                          &pi, &pisize,
  67                                                          &tw, &twsz)))
  68             continue;
  69           if (twsz)
  70             /* Gratuitous.  */
  71             __vm_deallocate (__mach_task_self (), (vm_address_t) tw, twsz);
  72           if (pi != oldpi && oldpi != pibuf)
  73             /* Old buffer from last call was not reused; free it.  */
  74             __vm_deallocate (__mach_task_self (),
  75                              (vm_address_t) oldpi, oldpisize * sizeof pi[0]);
  76
  77           pip = (struct procinfo *) pi;
  78           if (pip->owner != (uid_t) who)
  79             continue;
  80         }
  81       else
  82         pip = NULL;
  83
  84       err = (*function) (pids[i], pip);
  85     }
  86
  87   if (pids != pidbuf)
  88     __vm_deallocate (__mach_task_self (),
  89                      (vm_address_t) pids, npids * sizeof pids[0]);
  90   if (pi != pibuf)
  91     __vm_deallocate (__mach_task_self (),
  92                      (vm_address_t) pi, pisize * sizeof pi[0]);
  93
  94   return err;
  95 }