1 files changed, 50 insertions, 0 deletions
diff --git a/libfshelp/return-buffer.c b/libfshelp/return-buffer.c
new file mode 100644
index 00000000..58c704f3
--- /dev/null
+++ b/libfshelp/return-buffer.c
@@ -0,0 +1,50 @@
+/* Make a malloced buffer suitable for returning from a mach rpc
+
+   Copyright (C) 1996 Free Software Foundation, Inc.
+
+   Written by Miles Bader <miles@gnu.ai.mit.edu>
+
+   This file is part of the GNU Hurd.
+
+   The GNU Hurd 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.
+
+   The GNU Hurd 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 <string.h>
+#include <mach.h>
+
+#include "fshelp.h"
+
+/* Puts data from the malloced buffer BUF, LEN bytes long, into RBUF & RLEN,
+   suitable for returning from a mach rpc.  If LEN > 0, BUF is freed,
+   regardless of whether an error is returned or not.  */
+error_t
+fshelp_return_malloced_buffer (char *buf, size_t len,
+			       char **rbuf, mach_msg_type_number_t *rlen)
+{
+  error_t err = 0;
+
+  if (*rlen < len)
+    err = vm_allocate (mach_task_self (), (vm_address_t *)rbuf, len, 1);
+  if (! err)
+    {
+      if (len)
+	bcopy (buf, *rbuf, len);
+      *rlen = len;
+    }
+
+  if (len > 0)
+    free (buf);
+
+  return err;
+}