hurd/hurdinit.c

   1 /* Copyright (C) 1992, 1993, 1994, 1995, 1996 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 sigset_t _hurdsig_traced;
  34 char **__libc_argv;
  35
  36
  37 error_t
  38 _hurd_ports_use (int which, error_t (*operate) (mach_port_t))
  39 {
  40   return HURD_PORT_USE (&_hurd_ports[which], (*operate) (port));
  41 }
  42
  43 void _hurd_proc_init (char **argv);
  44
  45 DEFINE_HOOK (_hurd_subinit, (void));
  46
  47 /* Initialize the library data structures from the
  48    ints and ports passed to us by the exec server.
  49
  50    PORTARRAY and INTARRAY are vm_deallocate'd.  */
  51
  52 void
  53 _hurd_init (int flags, char **argv,
  54             mach_port_t *portarray, size_t portarraysize,
  55             int *intarray, size_t intarraysize)
  56 {
  57   size_t i;
  58
  59   _hurd_exec_flags = flags;
  60
  61   _hurd_ports = malloc (portarraysize * sizeof (*_hurd_ports));
  62   if (_hurd_ports == NULL)
  63     __libc_fatal ("Can't allocate _hurd_ports\n");
  64   _hurd_nports = portarraysize;
  65
  66   /* See what ports we were passed.  */
  67   for (i = 0; i < portarraysize; ++i)
  68     _hurd_port_init (&_hurd_ports[i], portarray[i]);
  69
  70   /* When the user asks for the bootstrap port,
  71      he will get the one the exec server passed us.  */
  72   __task_set_special_port (__mach_task_self (), TASK_BOOTSTRAP_PORT,
  73                            portarray[INIT_PORT_BOOTSTRAP]);
  74
  75   if (intarraysize > INIT_UMASK)
  76     _hurd_umask = intarray[INIT_UMASK] & 0777;
  77   else
  78     _hurd_umask = CMASK;
  79
  80   if (intarraysize > INIT_TRACEMASK)
  81     _hurdsig_traced = intarray[INIT_TRACEMASK];
  82
  83   /* Tell the proc server we exist, if it does.  */
  84   if (portarray[INIT_PORT_PROC] != MACH_PORT_NULL)
  85     _hurd_proc_init (argv);
  86
  87   /* All done with init ints and ports.  */
  88   __vm_deallocate (__mach_task_self (),
  89                    (vm_address_t) intarray,
  90                    intarraysize * sizeof (int));
  91   __vm_deallocate (__mach_task_self (),
  92                    (vm_address_t) portarray,
  93                    portarraysize * sizeof (mach_port_t));
  94
  95   if (flags & EXEC_SECURE)
  96     /* XXX if secure exec, elide environment variables
  97        which the library uses and could be security holes.
  98        CORESERVER, COREFILE
  99        */ ;
 100
 101   /* Call other things which want to do some initialization.  These are not
 102      on the __libc_subinit hook because things there like to be able to
 103      assume the availability of the POSIX.1 services we provide.  */
 104   RUN_HOOK (_hurd_subinit, ());
 105 }
 106 \f
 107 #include <hurd/signal.h>
 108
 109 /* The user can do "int _hide_arguments = 1;" to make
 110    sure the arguments are never visible with `ps'.  */
 111 int _hide_arguments, _hide_environment;
 112
 113 /* Hook for things which should be initialized as soon as the proc
 114    server is available.  */
 115 DEFINE_HOOK (_hurd_proc_subinit, (void));
 116
 117 /* Do startup handshaking with the proc server just installed in _hurd_ports.
 118    Call _hurdsig_init to set up signal processing.  */
 119
 120 void
 121 _hurd_proc_init (char **argv)
 122 {
 123   mach_port_t oldmsg;
 124   struct hurd_userlink ulink;
 125   process_t procserver;
 126
 127   /* Initialize the signal code; Mach exceptions will become signals.  */
 128   _hurdsig_init ();
 129
 130   /* The signal thread is now prepared to receive messages.
 131      It is safe to give the port to the proc server.  */
 132
 133   procserver = _hurd_port_get (&_hurd_ports[INIT_PORT_PROC], &ulink);
 134
 135   /* Give the proc server our message port.  */
 136   __proc_setmsgport (procserver, _hurd_msgport, &oldmsg);
 137   if (oldmsg != MACH_PORT_NULL)
 138     /* Deallocate the old msg port we replaced.  */
 139     __mach_port_deallocate (__mach_task_self (), oldmsg);
 140
 141   /* Tell the proc server where our args and environment are.  */
 142   __proc_set_arg_locations (procserver,
 143                             _hide_arguments ? 0 : (vm_address_t) argv,
 144                             _hide_environment ? 0 : (vm_address_t) __environ);
 145
 146   _hurd_port_free (&_hurd_ports[INIT_PORT_PROC], &ulink, procserver);
 147
 148   /* Initialize proc server-assisted fault recovery for the signal thread.  */
 149   _hurdsig_fault_init ();
 150
 151   /* Call other things which want to do some initialization.  These are not
 152      on the _hurd_subinit hook because things there assume that things done
 153      here, like _hurd_pid, are already initialized.  */
 154   RUN_HOOK (_hurd_proc_subinit, ());
 155
 156   if (_hurdsig_traced)
 157     /* This process is "traced", meaning it should stop on signals or exec.
 158        We are all set up now to handle signals.  Stop ourselves, to inform
 159        our parent (presumably a debugger) that the exec has completed.  */
 160     __msg_sig_post (_hurd_msgport, SIGTRAP, 0, __mach_task_self ());
 161 }
 162 \f
 163 /* Called when we get a message telling us to change our proc server port.  */
 164
 165 error_t
 166 _hurd_setproc (process_t procserver)
 167 {
 168   error_t err;
 169   mach_port_t oldmsg;
 170
 171   /* Give the proc server our message port.  */
 172   if (err = __proc_setmsgport (procserver, _hurd_msgport, &oldmsg))
 173     return err;
 174   if (oldmsg != MACH_PORT_NULL)
 175     /* Deallocate the old msg port we replaced.  */
 176     __mach_port_deallocate (__mach_task_self (), oldmsg);
 177
 178   /* Tell the proc server where our args and environment are.  */
 179   if (err = __proc_set_arg_locations (procserver,
 180                                       _hide_arguments ? 0 :
 181                                       (vm_address_t) __libc_argv,
 182                                       _hide_environment ? 0 :
 183                                       (vm_address_t) __environ))
 184     return err;
 185
 186   /* Those calls worked, so the port looks good.  */
 187   _hurd_port_set (&_hurd_ports[INIT_PORT_PROC], procserver);
 188
 189   {
 190     pid_t oldpgrp = _hurd_pgrp;
 191
 192     /* Call these functions again so they can fetch the
 193        new information from the new proc server.  */
 194     RUN_HOOK (_hurd_proc_subinit, ());
 195
 196     if (_hurd_pgrp != oldpgrp)
 197       {
 198         /* Run things that want notification of a pgrp change.  */
 199         DECLARE_HOOK (_hurd_pgrp_changed_hook, (pid_t));
 200         RUN_HOOK (_hurd_pgrp_changed_hook, (_hurd_pgrp));
 201       }
 202   }
 203
 204   return 0;
 205 }