hurd/hurdpid.c

   1 /* Copyright (C) 1991, 1992, 1993, 1994, 1995 Free Software Foundation, Inc.
   2 This file is part of the GNU C Library.
   3
   4 The GNU C Library is free software; you can redistribute it and/or
   5 modify it under the terms of the GNU Library General Public License as
   6 published by the Free Software Foundation; either version 2 of the
   7 License, or (at your option) any later version.
   8
   9 The GNU C Library is distributed in the hope that it will be useful,
  10 but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12 Library General Public License for more details.
  13
  14 You should have received a copy of the GNU Library General Public
  15 License along with the GNU C Library; see the file COPYING.LIB.  If
  16 not, write to the Free Software Foundation, Inc., 675 Mass Ave,
  17 Cambridge, MA 02139, USA.  */
  18
  19 #include <hurd.h>
  20 pid_t _hurd_pid, _hurd_ppid, _hurd_pgrp;
  21 int _hurd_orphaned;
  22
  23 static void
  24 init_pids (void)
  25 {
  26   __USEPORT (PROC,
  27              ({
  28                __proc_getpids (port, &_hurd_pid, &_hurd_ppid, &_hurd_orphaned);
  29                __proc_getpgrp (port, _hurd_pid, &_hurd_pgrp);
  30              }));
  31
  32   (void) &init_pids;            /* Avoid "defined but not used" warning.  */
  33 }
  34
  35 text_set_element (_hurd_proc_subinit, init_pids);
  36 \f
  37 #include <hurd/msg_server.h>
  38 #include "set-hooks.h"
  39 #include <cthreads.h>
  40
  41 DEFINE_HOOK (_hurd_pgrp_changed_hook, (pid_t));
  42
  43 /* These let user threads synchronize with an operation which changes ids.  */
  44 unsigned int _hurd_pids_changed_stamp;
  45 struct condition _hurd_pids_changed_sync;
  46
  47 kern_return_t
  48 _S_msg_proc_newids (mach_port_t me,
  49                     task_t task,
  50                     pid_t ppid, pid_t pgrp, int orphaned)
  51 {
  52   int pgrp_changed;
  53
  54   if (task != __mach_task_self ())
  55     return EPERM;
  56
  57   __mach_port_deallocate (__mach_task_self (), task);
  58
  59   pgrp_changed = pgrp != _hurd_pgrp;
  60   _hurd_ppid = ppid;
  61   _hurd_pgrp = pgrp;
  62   _hurd_orphaned = orphaned;
  63
  64   if (pgrp_changed)
  65     /* Run things that want notification of a pgrp change.  */
  66     RUN_HOOK (_hurd_pgrp_changed_hook, (pgrp));
  67
  68   /* Notify any waiting user threads that the id change as been completed.  */
  69   ++_hurd_pids_changed_stamp;
  70
  71   return 0;
  72 }