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/* Implement ifsock inteface
Copyright (C) 1994 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 <hurd/paths.h>
#include <sys/socket.h>
spin_lock_t pflocalserverlock = SPIN_LOCK_INITIALIZER;
mach_port_t pflocalserver = MACH_PORT_NULL;
S_ifsock_getsockaddr (struct protid *cred,
mach_port_t *address)
{
error_t err;
struct node *np;
/* Make sure this is a socket */
if (!cred)
return EOPNOTSUPP;
np = cred->po->np;
retry:
mutex_lock (&np->lock);
if ((np->dn_stat.st_mode & S_IFMT) != S_IFSOCK)
{
mutex_unlock (&np->lock);
return EOPNOTSUPP;
}
err = diskfs_access (np, S_IREAD, cred);
if (err)
{
mutex_unlock (&np->lock);
return err;
}
if (np->sockaddr == MACH_PORT_NULL)
{
mach_port_t server;
/* Fetch a port to the PF_LOCAL server, caching it. */
spin_lock (&pflocalserverlock);
if (pflocalserver == MACH_PORT_NULL)
{
/* Find out who the PF_LOCAL server is. Unfortunately,
we have to release our lock on NP to do this lookup
with maximal safety, so after we find out who the
server is, we have to loop back. */
char buf[100];
spin_unlock (&pflocalserverlock);
mutex_unlock (&np->lock);
/* Look it up */
sprintf (buf, "%s/%d", _SERVERS_SOCKET, PF_LOCAL);
server = path_lookup (buf, 0);
if (server == MACH_PORT_NULL)
return EIEIO;
/* Set it unless someone is already here */
spin_lock (&pflocalserverlock);
if (pflocalserver != MACH_PORT_NULL)
mach_port_deallocate (mach_task_self (), server);
else
pflocalserver = server;
spin_unlock (&pflocalserverlock);
goto retry;
}
server = pflocalserver;
spin_unlock (&pflocalserverlock);
/* Create an address for the node */
err = socket_fabricate_address (server, &np->sockaddr);
if (err)
{
mutex_unlock (&np->lock);
return EIEIO;
}
}
*address = np->sockaddr;
mutex_unlock (&np->lock);
return 0;
}
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