hurd/hurdinit.c

   1 /* Copyright (C) 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 <sys/stat.h>
  20 #include <stdlib.h>
  21 #include <stdio.h>
  22 #include <unistd.h>
  23 #include <hurd.h>
  24 #include <hurd/port.h>
  25 #include "set-hooks.h"
  26 #include "hurdmalloc.h"         /* XXX */
  27
  28
  29 int _hurd_exec_flags;
  30 struct hurd_port *_hurd_ports;
  31 unsigned int _hurd_nports;
  32 mode_t _hurd_umask;
  33
  34 error_t
  35 _hurd_ports_use (int which, error_t (*operate) (mach_port_t))
  36 {
  37   return HURD_PORT_USE (&_hurd_ports[which], (*operate) (port));
  38 }
  39
  40 void _hurd_proc_init (char **argv);
  41
  42 DEFINE_HOOK (_hurd_subinit, (void));
  43
  44 /* Initialize the library data structures from the
  45    ints and ports passed to us by the exec server.
  46
  47    PORTARRAY and INTARRAY are vm_deallocate'd.  */
  48
  49 void
  50 _hurd_init (int flags, char **argv,
  51             mach_port_t *portarray, size_t portarraysize,
  52             int *intarray, size_t intarraysize)
  53 {
  54   size_t i;
  55
  56   _hurd_exec_flags = flags;
  57
  58   _hurd_ports = malloc (portarraysize * sizeof (*_hurd_ports));
  59   if (_hurd_ports == NULL)
  60     __libc_fatal ("Can't allocate _hurd_ports\n");
  61   _hurd_nports = portarraysize;
  62
  63   /* See what ports we were passed.  */
  64   for (i = 0; i < portarraysize; ++i)
  65     _hurd_port_init (&_hurd_ports[i], portarray[i]);
  66
  67   /* When the user asks for the bootstrap port,
  68      he will get the one the exec server passed us.  */
  69   __task_set_special_port (__mach_task_self (), TASK_BOOTSTRAP_PORT,
  70                            portarray[INIT_PORT_BOOTSTRAP]);
  71
  72   /* Tell the proc server we exist, if it does.  */
  73   if (portarray[INIT_PORT_PROC] != MACH_PORT_NULL)
  74     _hurd_proc_init (argv);
  75
  76   if (intarraysize > INIT_UMASK)
  77     _hurd_umask = intarray[INIT_UMASK] & 0777;
  78   else
  79     _hurd_umask = CMASK;
  80
  81   /* All done with init ints and ports.  */
  82   __vm_deallocate (__mach_task_self (),
  83                    (vm_address_t) intarray,
  84                    intarraysize * sizeof (int));
  85   __vm_deallocate (__mach_task_self (),
  86                    (vm_address_t) portarray,
  87                    portarraysize * sizeof (mach_port_t));
  88
  89   if (flags & EXEC_SECURE)
  90     /* XXX if secure exec, elide environment variables
  91        which the library uses and could be security holes.
  92        CORESERVER, COREFILE
  93        */ ;
  94
  95   /* Call other things which want to do some initialization.  These are not
  96      on the __libc_subinit hook because things there like to be able to
  97      assume the availability of the POSIX.1 services we provide.  */
  98   RUN_HOOK (_hurd_subinit, ());
  99 }
 100 \f
 101 #include <hurd/signal.h>
 102
 103 /* The user can do "int _hide_arguments = 1;" to make
 104    sure the arguments are never visible with `ps'.  */
 105 int _hide_arguments, _hide_environment;
 106
 107 /* Hook for things which should be initialized as soon as the proc
 108    server is available.  */
 109 DEFINE_HOOK (_hurd_proc_subinit, (void));
 110
 111 /* Do startup handshaking with the proc server just installed in _hurd_ports.
 112    Call _hurdsig_init to set up signal processing.  */
 113
 114 void
 115 _hurd_proc_init (char **argv)
 116 {
 117   mach_port_t oldmsg;
 118   struct hurd_userlink ulink;
 119   process_t procserver;
 120
 121   /* Initialize the signal code; Mach exceptions will become signals.  */
 122   _hurdsig_init ();
 123
 124   /* The signal thread is now prepared to receive messages.
 125      It is safe to give the port to the proc server.  */
 126
 127   procserver = _hurd_port_get (&_hurd_ports[INIT_PORT_PROC], &ulink);
 128
 129   /* Give the proc server our message port.  */
 130   __proc_setmsgport (procserver, _hurd_msgport, &oldmsg);
 131   if (oldmsg != MACH_PORT_NULL)
 132     /* Deallocate the old msg port we replaced.  */
 133     __mach_port_deallocate (__mach_task_self (), oldmsg);
 134
 135   /* Tell the proc server where our args and environment are.  */
 136   __proc_set_arg_locations (procserver,
 137                             _hide_arguments ? 0 : (vm_address_t) argv,
 138                             _hide_environment ? 0 : (vm_address_t) __environ);
 139
 140   _hurd_port_free (&_hurd_ports[INIT_PORT_PROC], &ulink, procserver);
 141
 142   /* Initialize proc server-assisted fault recovery for the signal thread.  */
 143   _hurdsig_fault_init ();
 144
 145   /* Call other things which want to do some initialization.  These are not
 146      on the _hurd_subinit hook because things there assume that things done
 147      here, like _hurd_pid, are already initialized.  */
 148   RUN_HOOK (_hurd_proc_subinit, ());
 149
 150   if (_hurd_exec_flags & EXEC_TRACED)
 151     /* This process is "traced", meaning it should stop on signals or exec.
 152        We are all set up now to handle signals.  Stop ourselves, to inform
 153        our parent (presumably a debugger) that the exec has completed.  */
 154     __msg_sig_post (_hurd_msgport, SIGTRAP, __mach_task_self ());
 155 }
 156 \f
 157 /* Called when we get a message telling us to change our proc server port.  */
 158
 159 error_t
 160 _hurd_setproc (process_t procserver)
 161 {
 162   error_t err;
 163   mach_port_t oldmsg;
 164
 165   /* Give the proc server our message port.  */
 166   if (err = __proc_setmsgport (procserver, _hurd_msgport, &oldmsg))
 167     return err;
 168   if (oldmsg != MACH_PORT_NULL)
 169     /* Deallocate the old msg port we replaced.  */
 170     __mach_port_deallocate (__mach_task_self (), oldmsg);
 171
 172   /* Tell the proc server where our args and environment are.  */
 173   if (err = __proc_set_arg_locations (procserver,
 174                                       /* We don't know the ARGV location.  */
 175                                       (vm_address_t) 0,
 176                                       _hide_environment ? 0 :
 177                                       (vm_address_t) __environ))
 178     return err;
 179
 180   /* Those calls worked, so the port looks good.  */
 181   _hurd_port_set (&_hurd_ports[INIT_PORT_PROC], procserver);
 182
 183   {
 184     pid_t oldpgrp = _hurd_pgrp;
 185
 186     /* Call these functions again so they can fetch the
 187        new information from the new proc server.  */
 188     RUN_HOOK (_hurd_proc_subinit, ());
 189
 190     if (_hurd_pgrp != oldpgrp)
 191       {
 192         /* Run things that want notification of a pgrp change.  */
 193         DECLARE_HOOK (_hurd_pgrp_changed_hook, (pid_t));
 194         RUN_HOOK (_hurd_pgrp_changed_hook, (_hurd_pgrp));
 195       }
 196   }
 197
 198   return 0;
 199 }