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/* GNU Hurd standard exec server, main program and server mechanics.
Copyright (C) 1992,93,94,95,96,97,98,99,2000,01,02,13
Free Software Foundation, Inc.
Written by Roland McGrath.
This file is part of the GNU Hurd.
The GNU Hurd is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.
The GNU Hurd 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with the GNU Hurd; see the file COPYING. If not, write to
the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
#include "priv.h"
#include <error.h>
#include <hurd/paths.h>
#include <hurd/startup.h>
#include <argp.h>
#include <version.h>
#include <pids.h>
const char *argp_program_version = STANDARD_HURD_VERSION (exec);
/* Trivfs hooks. */
int trivfs_fstype = FSTYPE_MISC;
int trivfs_fsid = 0;
int trivfs_support_read = 0;
int trivfs_support_write = 0;
int trivfs_allow_open = 0;
struct port_class *trivfs_protid_portclasses[1];
struct port_class *trivfs_cntl_portclasses[1];
int trivfs_protid_nportclasses = 1;
int trivfs_cntl_nportclasses = 1;
struct trivfs_control *fsys;
char **save_argv;
static int
exec_demuxer (mach_msg_header_t *inp, mach_msg_header_t *outp)
{
mig_routine_t exec_server_routine (mach_msg_header_t *);
mig_routine_t exec_startup_server_routine (mach_msg_header_t *);
mig_routine_t routine;
if ((routine = exec_server_routine (inp)) ||
(routine = NULL, trivfs_demuxer (inp, outp)) ||
(routine = exec_startup_server_routine (inp)))
{
if (routine)
(*routine) (inp, outp);
return TRUE;
}
else
return FALSE;
}
/* Clean up the storage in BOOT, which was never used. */
void
deadboot (void *p)
{
struct bootinfo *boot = p;
size_t i;
munmap (boot->argv, boot->argvlen);
munmap (boot->envp, boot->envplen);
for (i = 0; i < boot->dtablesize; ++i)
mach_port_deallocate (mach_task_self (), boot->dtable[i]);
for (i = 0; i < boot->nports; ++i)
mach_port_deallocate (mach_task_self (), boot->portarray[i]);
munmap (boot->portarray, boot->nports * sizeof (mach_port_t));
munmap (boot->intarray, boot->nints * sizeof (int));
/* See if we are going away and this was the last thing keeping us up. */
if (ports_count_class (trivfs_cntl_portclasses[0]) == 0)
{
/* We have no fsys control port, so we are detached from the
parent filesystem. Maybe we have no users left either. */
if (ports_count_class (trivfs_protid_portclasses[0]) == 0)
{
/* We have no user ports left. Are we still listening for
exec_startup RPCs from any tasks we already started? */
if (ports_count_class (execboot_portclass) == 0)
/* Nobody talking. Time to die. */
exit (0);
ports_enable_class (execboot_portclass);
}
ports_enable_class (trivfs_protid_portclasses[0]);
}
ports_enable_class (trivfs_cntl_portclasses[0]);
}
int
main (int argc, char **argv)
{
error_t err;
mach_port_t bootstrap;
struct argp argp = { 0, 0, 0, "Hurd standard exec server." };
argp_parse (&argp, argc, argv, 0, 0, 0);
save_argv = argv;
task_get_bootstrap_port (mach_task_self (), &bootstrap);
if (bootstrap == MACH_PORT_NULL)
error (2, 0, "Must be started as a translator");
/* Fetch our proc server port for easy use. If we are booting, it is not
set yet and `getproc' returns MACH_PORT_NULL; we reset PROCSERVER in
S_exec_init (below). */
procserver = getproc ();
port_bucket = ports_create_bucket ();
trivfs_cntl_portclasses[0] = ports_create_class (trivfs_clean_cntl, 0);
trivfs_protid_portclasses[0] = ports_create_class (trivfs_clean_protid, 0);
execboot_portclass = ports_create_class (deadboot, NULL);
/* Reply to our parent. */
err = trivfs_startup (bootstrap, 0,
trivfs_cntl_portclasses[0], port_bucket,
trivfs_protid_portclasses[0], port_bucket,
&fsys);
mach_port_deallocate (mach_task_self (), bootstrap);
if (err)
error (3, err, "Contacting parent");
/* Launch. */
ports_manage_port_operations_multithread (port_bucket, exec_demuxer,
2 * 60 * 1000, 0, 0);
return 0;
}
void
trivfs_modify_stat (struct trivfs_protid *cred, struct stat *st)
{
st->st_fstype = FSTYPE_MISC;
}
error_t
trivfs_goaway (struct trivfs_control *fsys, int flags)
{
int count;
/* Stop new requests. */
ports_inhibit_class_rpcs (trivfs_cntl_portclasses[0]);
ports_inhibit_class_rpcs (trivfs_protid_portclasses[0]);
/* Are there any extant user ports for the /servers/exec file? */
count = ports_count_class (trivfs_protid_portclasses[0]);
if (count == 0 || (flags & FSYS_GOAWAY_FORCE))
{
/* No users. Disconnect from the filesystem. */
mach_port_deallocate (mach_task_self (), fsys->underlying);
/* Are there remaining exec_startup RPCs to answer? */
count = ports_count_class (execboot_portclass);
if (count == 0)
/* Nope. We got no reason to live. */
exit (0);
/* Continue servicing tasks starting up. */
ports_enable_class (execboot_portclass);
/* No more communication with the parent filesystem. */
ports_destroy_right (fsys);
return 0;
}
else
{
/* We won't go away, so start things going again... */
ports_enable_class (trivfs_protid_portclasses[0]);
ports_resume_class_rpcs (trivfs_cntl_portclasses[0]);
ports_resume_class_rpcs (trivfs_protid_portclasses[0]);
return EBUSY;
}
}
/* Sent by the bootstrap filesystem after the other essential
servers have been started up. */
kern_return_t
S_exec_init (struct trivfs_protid *protid,
auth_t auth, process_t proc)
{
mach_port_t host_priv, startup;
error_t err;
if (! protid || ! protid->isroot)
return EPERM;
_hurd_port_set (&_hurd_ports[INIT_PORT_PROC], proc); /* Consume. */
_hurd_port_set (&_hurd_ports[INIT_PORT_AUTH], auth); /* Consume. */
/* Do initial setup with the proc server. */
_hurd_proc_init (save_argv, NULL, 0);
procserver = getproc ();
/* Have the proc server notify us when the canonical ints and ports
change. This will generate an immediate callback giving us the
initial boot-time canonical sets. */
{
struct iouser *user;
struct trivfs_protid *cred;
mach_port_t right;
err = iohelp_create_empty_iouser (&user);
assert_perror (err);
err = trivfs_open (fsys, user, 0, MACH_PORT_NULL, &cred);
assert_perror (err);
right = ports_get_send_right (cred);
proc_execdata_notify (procserver, right, MACH_MSG_TYPE_COPY_SEND);
mach_port_deallocate (mach_task_self (), right);
}
err = get_privileged_ports (&host_priv, NULL);
assert_perror (err);
proc_register_version (procserver, host_priv, "exec", "", HURD_VERSION);
err = proc_getmsgport (procserver, HURD_PID_STARTUP, &startup);
assert_perror (err);
mach_port_deallocate (mach_task_self (), procserver);
/* Call startup_essential task last; init assumes we are ready to
run once we call it. */
err = startup_essential_task (startup, mach_task_self (), MACH_PORT_NULL,
"exec", host_priv);
assert_perror (err);
mach_port_deallocate (mach_task_self (), startup);
mach_port_deallocate (mach_task_self (), host_priv);
return 0;
}
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