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/* Implement ifsock inteface
Copyright (C) 1994, 1996 Free Software Foundation
This program 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.
This program 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 this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
#include "priv.h"
#include "ifsock_S.h"
#include <hurd/paths.h>
#include <sys/socket.h>
#include <stdio.h>
#include <hurd/socket.h>
static pthread_spinlock_t pflocalserverlock = PTHREAD_SPINLOCK_INITIALIZER;
static mach_port_t pflocalserver = MACH_PORT_NULL;
kern_return_t
diskfs_S_ifsock_getsockaddr (struct protid *cred,
mach_port_t *address)
{
error_t err;
struct node *np;
unsigned restart_tries = 0;
/* Make sure this is a socket */
if (!cred)
return EOPNOTSUPP;
np = cred->po->np;
retry:
pthread_mutex_lock (&np->lock);
if ((np->dn_stat.st_mode & S_IFMT) != S_IFSOCK)
{
pthread_mutex_unlock (&np->lock);
return EOPNOTSUPP;
}
err = fshelp_access (&np->dn_stat, S_IWRITE, cred->user);
if (err)
{
pthread_mutex_unlock (&np->lock);
return err;
}
if (np->sockaddr == MACH_PORT_NULL)
{
mach_port_t server;
mach_port_t sockaddr;
mach_port_t old;
pthread_mutex_unlock (&np->lock);
/* Fetch a port to the PF_LOCAL server, caching it. */
pthread_spin_lock (&pflocalserverlock);
if (pflocalserver == MACH_PORT_NULL)
{
/* Find out who the PF_LOCAL server is. */
char buf[100];
pthread_spin_unlock (&pflocalserverlock);
/* Look it up */
sprintf (buf, "%s/%d", _SERVERS_SOCKET, PF_LOCAL);
server = file_name_lookup (buf, 0, 0);
if (server == MACH_PORT_NULL)
return EIEIO;
/* Set it unless someone is already here */
pthread_spin_lock (&pflocalserverlock);
if (pflocalserver != MACH_PORT_NULL)
mach_port_deallocate (mach_task_self (), server);
else
pflocalserver = server;
pthread_spin_unlock (&pflocalserverlock);
goto retry;
}
server = pflocalserver;
pthread_spin_unlock (&pflocalserverlock);
/* Create an address for the node */
err = socket_fabricate_address (server, AF_LOCAL, &sockaddr);
if ((err == MACH_SEND_INVALID_DEST || err == MIG_SERVER_DIED)
&& restart_tries++ == 0)
/* The PF_LOCAL server died; try to restart it. */
{
pthread_spin_lock (&pflocalserverlock);
if (pflocalserver == server)
pflocalserver = MACH_PORT_NULL;
pthread_spin_unlock (&pflocalserverlock);
goto retry;
}
if (err)
return EIEIO;
pthread_mutex_lock (&np->lock);
if (np->sockaddr != MACH_PORT_NULL)
/* Someone beat us */
mach_port_deallocate (mach_task_self (), sockaddr);
else
{
/* The receive right of the sockaddr holds a reference;
when we get a dead name on that right we drop our
reference. */
mach_port_request_notification (mach_task_self (), sockaddr,
MACH_NOTIFY_DEAD_NAME, 1,
cred->pi.port_right,
MACH_MSG_TYPE_MAKE_SEND_ONCE,
&old);
if (old != MACH_PORT_NULL)
mach_port_deallocate (mach_task_self (), old);
np->sockaddr = sockaddr;
diskfs_nref (np);
}
}
*address = np->sockaddr;
pthread_mutex_unlock (&np->lock);
return 0;
}
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