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authorMiles Bader <miles@gnu.org>1996-06-21 04:06:09 +0000
committerMiles Bader <miles@gnu.org>1996-06-21 04:06:09 +0000
commitc67cd904d454ef10ff53871a4aa14e10c24fa598 (patch)
treefa7290acab58d1d835c497894891b602bf43f2be
parent1902fe4779d2aa720f0150076e262c900e3699f0 (diff)
Initial revision
-rw-r--r--libfshelp/return-buffer.c50
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;
+}