source: trunk/libs/mini-libc/mman.c @ 597

Last change on this file since 597 was 597, checked in by alain, 3 years ago

Rewrite the mmap() and stat() syscalls to implement the cat command in ksh.

File size: 2.0 KB
Line 
1/*
2 * mman.c - User level <mman> library implementation.
3 *
4 * Author     Alain Greiner (2016,2017,2018)
5 *
6 * Copyright (c) UPMC Sorbonne Universites
7 *
8 * This file is part of ALMOS-MKH.
9 *
10 * ALMOS-MKH is free software; you can redistribute it and/or modify it
11 * under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; version 2.0 of the License.
13 *
14 * ALMOS-MKH is distributed in the hope that it will be useful, but
15 * WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
17 * General Public License for more details.
18 *
19 * You should have received a copy of the GNU General Public License
20 * along with ALMOS-MKH; if not, write to the Free Software Foundation,
21 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
22 */
23
24#include <mman.h>
25#include <hal_shared_types.h>
26#include <hal_user.h>
27#include <syscalls_numbers.h>
28#include <stdio.h>
29
30////////////////////////////////
31int munmap( void         * addr,
32            unsigned int   size )
33{
34    return hal_user_syscall( SYS_MUNMAP,
35                             (reg_t)addr,
36                             (reg_t)size, 0, 0 );
37}
38
39///////////////////////////////
40void * mmap( void       * addr,
41             unsigned int length,
42             int          prot,
43             int          flags,
44             int          fd,
45             unsigned int offset )
46{
47    mmap_attr_t attr;
48
49    // addr argument must be NULL
50    if( addr != NULL )
51    {
52        printf("\n[ERROR] in %s : the <addr> argument must be NULL\n", __FUNCTION__ );
53        return NULL;
54    }
55
56    //set the mmap attributes
57    attr.addr   = NULL;
58    attr.length = length;
59    attr.prot   = prot;
60    attr.flags  = flags;
61    attr.fdid   = fd;
62    attr.offset = offset;
63
64    if( hal_user_syscall( SYS_MMAP,
65                          (reg_t)&attr, 0, 0, 0 ) ) return NULL;
66    else                                            return attr.addr;
67}
68
69
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