1 files changed, 79 insertions, 0 deletions
diff --git a/libdiskfs/io-pathconf.c b/libdiskfs/io-pathconf.c
new file mode 100644
index 00000000..b851f9b1
--- /dev/null
+++ b/libdiskfs/io-pathconf.c
@@ -0,0 +1,79 @@
+/* libdiskfs implementation of io.defs: io_pathconf
+   Copyright (C) 1992, 1993, 1994, 1995, 1999 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 <unistd.h>
+#include "priv.h"
+#include "io_S.h"
+#include <dirent.h>
+#include <limits.h>
+
+/* Implement io_pathconf as described in <hurd/io.defs>. */
+kern_return_t
+diskfs_S_io_pathconf (struct protid *cred,
+		      int name,
+		      int *value)
+{
+  if (!cred)
+    return EOPNOTSUPP;
+
+  switch (name)
+    {
+    case _PC_LINK_MAX:
+      *value = diskfs_link_max;
+      break;
+
+    case _PC_MAX_CANON:
+    case _PC_MAX_INPUT:
+    case _PC_PIPE_BUF:
+    case _PC_VDISABLE:
+    case _PC_SOCK_MAXBUF:
+      *value = -1;
+      break;
+
+    case _PC_NAME_MAX:
+      /* <hurd/hurd_types.defs> string_t constrains the upper bound.
+	 The `struct dirent' format defined by libc further contrains it.  */
+#define D_NAMLEN_MAX (UCHAR_MAX * sizeof (((struct dirent *) 0)->d_namlen))
+      if (diskfs_name_max > D_NAMLEN_MAX || diskfs_name_max < 0)
+	diskfs_name_max = D_NAMLEN_MAX;
+      *value = diskfs_name_max;
+      break;
+
+    case _PC_NO_TRUNC:		/* enforced in diskfs_lookup */
+      *value = 1; /* diskfs_name_max >= 0; */ /* see above */
+      break;
+
+    case _PC_CHOWN_RESTRICTED:
+    case _PC_SYNC_IO:
+    case _PC_ASYNC_IO:
+      *value = 1;
+      break;
+
+    case _PC_PRIO_IO:
+      *value = 0;
+      break;
+
+    case _PC_FILESIZEBITS:
+      *value = 32;
+      break;
+
+    default:
+      return EINVAL;
+    }
+
+  return 0;
+}