mirror of
git://sourceware.org/git/glibc.git
synced 2024-12-03 04:01:43 +08:00
305 lines
8.3 KiB
C
305 lines
8.3 KiB
C
/* Copyright (C) 1991,92,93,94,95,96,97,99 Free Software Foundation, Inc.
|
||
This file is part of the GNU C Library.
|
||
|
||
The GNU C Library is free software; you can redistribute it and/or
|
||
modify it under the terms of the GNU Lesser General Public
|
||
License as published by the Free Software Foundation; either
|
||
version 2.1 of the License, or (at your option) any later version.
|
||
|
||
The GNU C Library 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
|
||
Lesser General Public License for more details.
|
||
|
||
You should have received a copy of the GNU Lesser General Public
|
||
License along with the GNU C Library; if not, see
|
||
<http://www.gnu.org/licenses/>. */
|
||
|
||
#include <hurd.h>
|
||
#include <hurd/term.h>
|
||
#include <hurd/fd.h>
|
||
#include <stdlib.h>
|
||
#include <stdio.h>
|
||
#include <fcntl.h>
|
||
#include <limits.h>
|
||
#include <cthreads.h> /* For `struct mutex'. */
|
||
#include "set-hooks.h"
|
||
#include "hurdmalloc.h" /* XXX */
|
||
|
||
|
||
struct mutex _hurd_dtable_lock = MUTEX_INITIALIZER; /* XXX ld bug; must init */
|
||
struct hurd_fd **_hurd_dtable;
|
||
int _hurd_dtablesize;
|
||
|
||
|
||
DEFINE_HOOK (_hurd_fd_subinit, (void));
|
||
|
||
/* Initialize the file descriptor table at startup. */
|
||
|
||
static void
|
||
init_dtable (void)
|
||
{
|
||
int i;
|
||
|
||
__mutex_init (&_hurd_dtable_lock);
|
||
|
||
/* The initial size of the descriptor table is that of the passed-in
|
||
table. It will be expanded as necessary up to _hurd_dtable_rlimit. */
|
||
_hurd_dtablesize = _hurd_init_dtablesize;
|
||
|
||
/* Allocate the vector of pointers. */
|
||
_hurd_dtable = malloc (_hurd_dtablesize * sizeof (*_hurd_dtable));
|
||
if (_hurd_dtablesize != 0 && _hurd_dtable == NULL)
|
||
__libc_fatal ("hurd: Can't allocate file descriptor table\n");
|
||
|
||
/* Initialize the descriptor table. */
|
||
for (i = 0; (unsigned int) i < _hurd_init_dtablesize; ++i)
|
||
{
|
||
if (_hurd_init_dtable[i] == MACH_PORT_NULL)
|
||
/* An unused descriptor is marked by a null pointer. */
|
||
_hurd_dtable[i] = NULL;
|
||
else
|
||
{
|
||
/* Allocate a new file descriptor structure. */
|
||
struct hurd_fd *new = malloc (sizeof (struct hurd_fd));
|
||
if (new == NULL)
|
||
__libc_fatal ("hurd: Can't allocate initial file descriptors\n");
|
||
|
||
/* Initialize the port cells. */
|
||
_hurd_port_init (&new->port, MACH_PORT_NULL);
|
||
_hurd_port_init (&new->ctty, MACH_PORT_NULL);
|
||
|
||
/* Install the port in the descriptor.
|
||
This sets up all the ctty magic. */
|
||
_hurd_port2fd (new, _hurd_init_dtable[i], 0);
|
||
|
||
_hurd_dtable[i] = new;
|
||
}
|
||
}
|
||
|
||
/* Clear out the initial descriptor table.
|
||
Everything must use _hurd_dtable now. */
|
||
__vm_deallocate (__mach_task_self (),
|
||
(vm_address_t) _hurd_init_dtable,
|
||
_hurd_init_dtablesize * sizeof (_hurd_init_dtable[0]));
|
||
_hurd_init_dtable = NULL;
|
||
_hurd_init_dtablesize = 0;
|
||
|
||
/* Initialize the remaining empty slots in the table. */
|
||
for (; i < _hurd_dtablesize; ++i)
|
||
_hurd_dtable[i] = NULL;
|
||
|
||
/* Run things that want to run after the file descriptor table
|
||
is initialized. */
|
||
RUN_HOOK (_hurd_fd_subinit, ());
|
||
|
||
(void) &init_dtable; /* Avoid "defined but not used" warning. */
|
||
}
|
||
|
||
text_set_element (_hurd_subinit, init_dtable);
|
||
|
||
/* XXX when the linker supports it, the following functions should all be
|
||
elsewhere and just have text_set_elements here. */
|
||
|
||
/* Called by `getdport' to do its work. */
|
||
|
||
static file_t
|
||
get_dtable_port (int fd)
|
||
{
|
||
struct hurd_fd *d = _hurd_fd_get (fd);
|
||
file_t dport;
|
||
|
||
if (!d)
|
||
return __hurd_fail (EBADF), MACH_PORT_NULL;
|
||
|
||
HURD_CRITICAL_BEGIN;
|
||
|
||
dport = HURD_PORT_USE (&d->port,
|
||
({
|
||
error_t err;
|
||
mach_port_t outport;
|
||
err = __mach_port_mod_refs (__mach_task_self (),
|
||
port,
|
||
MACH_PORT_RIGHT_SEND,
|
||
1);
|
||
if (err)
|
||
{
|
||
errno = err;
|
||
outport = MACH_PORT_NULL;
|
||
}
|
||
else
|
||
outport = port;
|
||
outport;
|
||
}));
|
||
|
||
HURD_CRITICAL_END;
|
||
|
||
return dport;
|
||
}
|
||
|
||
file_t (*_hurd_getdport_fn) (int fd) = get_dtable_port;
|
||
|
||
#include <hurd/signal.h>
|
||
|
||
/* We are in the child fork; the dtable lock is still held.
|
||
The parent has inserted send rights for all the normal io ports,
|
||
but we must recover ctty-special ports for ourselves. */
|
||
static error_t
|
||
fork_child_dtable (void)
|
||
{
|
||
error_t err;
|
||
int i;
|
||
|
||
err = 0;
|
||
|
||
for (i = 0; !err && i < _hurd_dtablesize; ++i)
|
||
{
|
||
struct hurd_fd *d = _hurd_dtable[i];
|
||
if (d == NULL)
|
||
continue;
|
||
|
||
/* No other thread is using the send rights in the child task. */
|
||
d->port.users = d->ctty.users = NULL;
|
||
|
||
if (d->ctty.port != MACH_PORT_NULL)
|
||
{
|
||
/* There was a ctty-special port in the parent.
|
||
We need to get one for ourselves too. */
|
||
__mach_port_deallocate (__mach_task_self (), d->ctty.port);
|
||
err = __term_open_ctty (d->port.port, _hurd_pid, _hurd_pgrp,
|
||
&d->ctty.port);
|
||
if (err)
|
||
d->ctty.port = MACH_PORT_NULL;
|
||
}
|
||
|
||
/* XXX for each fd with a cntlmap, reauth and re-map_cntl. */
|
||
}
|
||
return err;
|
||
|
||
(void) &fork_child_dtable; /* Avoid "defined but not used" warning. */
|
||
}
|
||
|
||
data_set_element (_hurd_fork_locks, _hurd_dtable_lock); /* XXX ld bug: bss */
|
||
text_set_element (_hurd_fork_child_hook, fork_child_dtable);
|
||
|
||
/* Called when our process group has changed. */
|
||
|
||
static void
|
||
ctty_new_pgrp (void)
|
||
{
|
||
int i;
|
||
|
||
HURD_CRITICAL_BEGIN;
|
||
__mutex_lock (&_hurd_dtable_lock);
|
||
|
||
if (__USEPORT (CTTYID, port == MACH_PORT_NULL))
|
||
{
|
||
/* We have no controlling terminal. If we haven't had one recently,
|
||
but our pgrp is being pointlessly diddled anyway, then we will
|
||
have nothing to do in the loop below because no fd will have a
|
||
ctty port at all.
|
||
|
||
More likely, a setsid call is responsible both for the change
|
||
in pgrp and for clearing the cttyid port. In that case, setsid
|
||
held the dtable lock while updating the dtable to clear all the
|
||
ctty ports, and ergo must have finished doing so before we run here.
|
||
So we can be sure, again, that the loop below has no work to do. */
|
||
}
|
||
else
|
||
for (i = 0; i < _hurd_dtablesize; ++i)
|
||
{
|
||
struct hurd_fd *const d = _hurd_dtable[i];
|
||
struct hurd_userlink ulink, ctty_ulink;
|
||
io_t port, ctty;
|
||
|
||
if (d == NULL)
|
||
/* Nothing to do for an unused descriptor cell. */
|
||
continue;
|
||
|
||
port = _hurd_port_get (&d->port, &ulink);
|
||
ctty = _hurd_port_get (&d->ctty, &ctty_ulink);
|
||
|
||
if (ctty != MACH_PORT_NULL)
|
||
{
|
||
/* This fd has a ctty-special port. We need a new one, to tell
|
||
the io server of our different process group. */
|
||
io_t new;
|
||
if (__term_open_ctty (port, _hurd_pid, _hurd_pgrp, &new))
|
||
new = MACH_PORT_NULL;
|
||
_hurd_port_set (&d->ctty, new);
|
||
}
|
||
|
||
_hurd_port_free (&d->port, &ulink, port);
|
||
_hurd_port_free (&d->ctty, &ctty_ulink, ctty);
|
||
}
|
||
|
||
__mutex_unlock (&_hurd_dtable_lock);
|
||
HURD_CRITICAL_END;
|
||
|
||
(void) &ctty_new_pgrp; /* Avoid "defined but not used" warning. */
|
||
}
|
||
|
||
text_set_element (_hurd_pgrp_changed_hook, ctty_new_pgrp);
|
||
|
||
/* Called to reauthenticate the dtable when the auth port changes. */
|
||
|
||
static void
|
||
reauth_dtable (void)
|
||
{
|
||
int i;
|
||
|
||
HURD_CRITICAL_BEGIN;
|
||
__mutex_lock (&_hurd_dtable_lock);
|
||
|
||
for (i = 0; i < _hurd_dtablesize; ++i)
|
||
{
|
||
struct hurd_fd *const d = _hurd_dtable[i];
|
||
mach_port_t new, newctty, ref;
|
||
|
||
if (d == NULL)
|
||
/* Nothing to do for an unused descriptor cell. */
|
||
continue;
|
||
|
||
ref = __mach_reply_port ();
|
||
|
||
/* Take the descriptor cell's lock. */
|
||
__spin_lock (&d->port.lock);
|
||
|
||
/* Reauthenticate the descriptor's port. */
|
||
if (d->port.port != MACH_PORT_NULL &&
|
||
! __io_reauthenticate (d->port.port,
|
||
ref, MACH_MSG_TYPE_MAKE_SEND) &&
|
||
! __USEPORT (AUTH, __auth_user_authenticate
|
||
(port,
|
||
ref, MACH_MSG_TYPE_MAKE_SEND,
|
||
&new)))
|
||
{
|
||
/* Replace the port in the descriptor cell
|
||
with the newly reauthenticated port. */
|
||
|
||
if (d->ctty.port != MACH_PORT_NULL &&
|
||
! __io_reauthenticate (d->ctty.port,
|
||
ref, MACH_MSG_TYPE_MAKE_SEND) &&
|
||
! __USEPORT (AUTH, __auth_user_authenticate
|
||
(port,
|
||
ref, MACH_MSG_TYPE_MAKE_SEND,
|
||
&newctty)))
|
||
_hurd_port_set (&d->ctty, newctty);
|
||
|
||
_hurd_port_locked_set (&d->port, new);
|
||
}
|
||
else
|
||
/* Lost. Leave this descriptor cell alone. */
|
||
__spin_unlock (&d->port.lock);
|
||
|
||
__mach_port_destroy (__mach_task_self (), ref);
|
||
}
|
||
|
||
__mutex_unlock (&_hurd_dtable_lock);
|
||
HURD_CRITICAL_END;
|
||
|
||
(void) &reauth_dtable; /* Avoid "defined but not used" warning. */
|
||
}
|
||
|
||
text_set_element (_hurd_reauth_hook, reauth_dtable);
|