/* -*-comment-start: "//";comment-end:""-*- * GNU Mes --- Maxwell Equations of Software * Copyright © 2019 Jan (janneke) Nieuwenhuizen * * 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 . */ #include struct mach_msg_int_pointer { mach_msg_header_t header; mach_msg_type_t type_one; int one; mach_msg_type_long_t type_two; union {char *two; char pointer[2048];}; }; kern_return_t __io_read (io_t io, data_t *data, mach_msg_type_number_t *read, loff_t offset, vm_size_t size) { union message { struct mach_msg_loff_int request; struct mach_msg_int_pointer reply; }; union message message = {0}; message.request.header.msgh_size = sizeof (message.request); message.request.type_one = mach_msg_type_int64; message.request.one = offset; message.request.type_two = mach_msg_type_int32; message.request.two = size; kern_return_t result = __syscall_put (io, SYS__io_read, &message.request.header, sizeof (message.reply)); if (result == KERN_SUCCESS) { *read = message.reply.type_two.msgtl_number; *data = message.reply.pointer; } else { *read = 0; *data = 0; } return result; }