mes/lib/gnu/dir-lookup.c

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/* -*-comment-start: "//";comment-end:""-*-
* GNU Mes --- Maxwell Equations of Software
* Copyright © 2019 Jan (janneke) Nieuwenhuizen <janneke@gnu.org>
*
* This file is part of GNU Mes.
*
* GNU Mes 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 3 of the License, or (at
* your option) any later version.
*
* GNU Mes 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 GNU Mes. If not, see <http://www.gnu.org/licenses/>.
*/
#include <gnu/syscall.h>
#include <string.h>
#include <sys/stat.h>
struct mach_msg_string_int_int
{
mach_msg_header_t header;
mach_msg_type_t type_one; string_t one;
mach_msg_type_t type_two; int two;
mach_msg_type_t type_three; int three;
};
struct mach_msg_int_int_string_int
{
mach_msg_header_t header;
mach_msg_type_t type_one; int one;
mach_msg_type_t type_two; int two;
mach_msg_type_t type_three; string_t three;
mach_msg_type_t type_four; int four;
};
mach_msg_type_t mach_msg_type_file_name =
{
/* msgt_name = */ (unsigned char) MACH_MSG_TYPE_STRING_C,
/* msgt_size = */ 8,
/* msgt_number = */ 1024,
/* msgt_inline = */ 1,
/* msgt_longform = */ 0,
/* msgt_deallocate = */ 0,
/* msgt_unused = */ 0
};
kern_return_t __dir_lookup (file_t start_dir, string_t file_name, int flags, mode_t mode, retry_type *do_retry, string_t retry_name, mach_port_t *port)
{
union message
{
struct mach_msg_string_int_int request;
struct mach_msg_int_int_string_int reply;
};
union message message = {0};
message.request.header.msgh_size = sizeof (message.request);
message.request.type_one = mach_msg_type_file_name;
strcpy (message.request.one, file_name);
message.request.type_two = mach_msg_type_int32;
message.request.two = flags;
message.request.type_three = mach_msg_type_int32;
message.request.three = mode;
kern_return_t result = __syscall_get (start_dir, SYS__dir_lookup,
&message.request.header,
sizeof (message.reply));
if (message.reply.one != KERN_SUCCESS)
return message.reply.one;
*port = message.reply.four;
return result;
}