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authorMichael I. Bushnell <mib@gnu.org>1994-02-03 20:09:05 +0000
committerMichael I. Bushnell <mib@gnu.org>1994-02-03 20:09:05 +0000
commit16d74144026b92f5d3f4b229730ed364f4729545 (patch)
tree3de8c6f93c16db20e3a8eb51a4711f3c48a3d739 /libdiskfs/io-map-cntl.c
parentbea3e0bba36cff8b2ef51e4235cf9444484f7dce (diff)
Initial revision
Diffstat (limited to 'libdiskfs/io-map-cntl.c')
-rw-r--r--libdiskfs/io-map-cntl.c48
1 files changed, 48 insertions, 0 deletions
diff --git a/libdiskfs/io-map-cntl.c b/libdiskfs/io-map-cntl.c
new file mode 100644
index 00000000..5c3aadd9
--- /dev/null
+++ b/libdiskfs/io-map-cntl.c
@@ -0,0 +1,48 @@
+/*
+ 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"
+
+/* Implement io_map_cntl as described in <hurd/io.defs>. */
+error_t
+S_io_map_cntl (struct protid *cred,
+ memory_object_t *ctlobj)
+{
+ if (!cred)
+ return EOPNOTSUPP;
+
+ assert (__vm_page_size >= sizeof (struct shared_io));
+ mutex_lock (&cred->po->np->lock);
+ if (!cred->mapped)
+ {
+ default_pager_object_create (default_pager, &cred->shared_object,
+ __vm_page_size);
+ vm_map (mach_task_self (), (u_int *)&cred->mapped, __vm_page_size, 0, 1,
+ cred->shared_object, 0, 0, VM_PROT_READ|VM_PROT_WRITE,
+ VM_PROT_READ|VM_PROT_WRITE, 0);
+ cred->mapped->conch_status = USER_HAS_NOT_CONCH;
+ spin_lock_init (&cred->mapped->lock);
+ *ctlobj = cred->shared_object;
+ mutex_unlock (&cred->po->np->lock);
+ return 0;
+ }
+ else
+ {
+ mutex_unlock (&cred->po->np->lock);
+ return EBUSY;
+ }
+}