From 8175bddaad6a2f144d822eecd7c9b038d9e034d7 Mon Sep 17 00:00:00 2001 From: "Michael I. Bushnell" Date: Mon, 13 Nov 1995 21:18:10 +0000 Subject: Initial revision --- libnetfs/io-read.c | 49 +++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 49 insertions(+) create mode 100644 libnetfs/io-read.c (limited to 'libnetfs/io-read.c') diff --git a/libnetfs/io-read.c b/libnetfs/io-read.c new file mode 100644 index 00000000..4a6b777c --- /dev/null +++ b/libnetfs/io-read.c @@ -0,0 +1,49 @@ +/* + Copyright (C) 1995 Free Software Foundation, Inc. + Written by Michael I. Bushnell, p/BSG. + + 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., 59 Temple Place - Suite 330, Boston, MA 02111, USA. */ + +#include "netfs.h" + +error_t +netfs_S_io_read (struct protid *user, + char **data, + mach_msg_type_number_t *datalen, + off_t offset, + mach_msg_type_number_t amount) +{ + error_t err; + int alloced = 0; + + if (!user) + return EOPNOTSUPP; + + if (amount > *datalen) + { + alloced = 1; + vm_allocate (mach_task_self (), (vm_address_t *) data, amount, 1); + } + *datalen = amount; + + err = netfs_attempt_read (user->credential, user->po->np, + offset, datalen, *data); + if (err && alloced) + vm_deallocate (mach_task_self (), (vm_address_t) *data, amount); + return err; +} + -- cgit v1.2.3