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authorMichael I. Bushnell <mib@gnu.org>1994-06-30 00:08:08 +0000
committerMichael I. Bushnell <mib@gnu.org>1994-06-30 00:08:08 +0000
commitc75bc9055df2ca66059b628a98871762dcb8453f (patch)
treef7a411b32716625946a784e924948ceb2380e295
parentc48ba4fa712531db5591fd9a63de74835415b2c3 (diff)
Initial revision
-rw-r--r--libdiskfs/ifsock.c100
1 files changed, 100 insertions, 0 deletions
diff --git a/libdiskfs/ifsock.c b/libdiskfs/ifsock.c
new file mode 100644
index 00000000..286a754b
--- /dev/null
+++ b/libdiskfs/ifsock.c
@@ -0,0 +1,100 @@
+/* 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;
+}
+